id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2403.11444 | Linlin Huang | Linlin Huang, Yuanyuan Wang, He-Xu Zhang, Shinya Matsuzaki, Hiroyuki
Ishida, Mamiya Kawaguchi, Akio Tomiya | Impact of local CP-odd domain in hot QCD on axionic domain-wall
interpretation for NANOGrav 15-year Data | 20 pages, 14 figures; a version accepted in Phys.Rev.D | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the axionic domain-wall with a QCD bias may be incompatible
with the NANOGrav 15-year data on a stochastic gravitational wave (GW)
background, when the domain wall network collapses in the hot-QCD induced local
CP-odd domain. This is due to the drastic suppression of the QCD bias set by
the QCD topological susceptibility in the presence of the CP-odd domain with
nonzero $\theta$ parameter of order one which the QCD sphaleron could generate.
We quantify the effect on the GW signals by working on a low-energy effective
model of Nambu-Jona-Lasinio type in the mean field approximation. We find that
only at $\theta=\pi$, the QCD bias tends to get significantly large enough due
to the criticality of the thermal CP restoration, which would, however, give
too big signal strengths to be consistent with the NANOGrav 15-year data and
would also be subject to the strength of the phase transition at the
criticality.
| [
{
"created": "Mon, 18 Mar 2024 03:41:51 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2024 01:59:05 GMT",
"version": "v2"
}
] | 2024-05-27 | [
[
"Huang",
"Linlin",
""
],
[
"Wang",
"Yuanyuan",
""
],
[
"Zhang",
"He-Xu",
""
],
[
"Matsuzaki",
"Shinya",
""
],
[
"Ishida",
"Hiroyuki",
""
],
[
"Kawaguchi",
"Mamiya",
""
],
[
"Tomiya",
"Akio",
""
]
] | We argue that the axionic domain-wall with a QCD bias may be incompatible with the NANOGrav 15-year data on a stochastic gravitational wave (GW) background, when the domain wall network collapses in the hot-QCD induced local CP-odd domain. This is due to the drastic suppression of the QCD bias set by the QCD topological susceptibility in the presence of the CP-odd domain with nonzero $\theta$ parameter of order one which the QCD sphaleron could generate. We quantify the effect on the GW signals by working on a low-energy effective model of Nambu-Jona-Lasinio type in the mean field approximation. We find that only at $\theta=\pi$, the QCD bias tends to get significantly large enough due to the criticality of the thermal CP restoration, which would, however, give too big signal strengths to be consistent with the NANOGrav 15-year data and would also be subject to the strength of the phase transition at the criticality. |
1204.5664 | Sofian Teber | S. Teber | Electromagnetic current correlations in reduced quantum electrodynamics | (v2) Accepted for publication in PRD. Conclusion and references added
(some / referee's comments). No change in results. 8 pages, 3 figures. (v1)
LaTeX file with feynMF package. 8 pages, no figure | Phys. Rev. D 86, 025005 (2012) | 10.1103/PhysRevD.86.025005 | null | hep-ph cond-mat.str-el hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a theory of massless reduced quantum electrodynamics
(RQED$_{d_\gamma,d_e}$), e.g., a quantum field theory where the U(1) gauge
field lives in $d_\gamma$-spacetime dimensions while the fermionic field lives
in a reduced spacetime of $d_e$ dimensions ($d_e \leqslant d_\gamma$). In the
case where $d_\gamma=4$ such RQEDs are renormalizable while they are
super-renormalizable for $d_\gamma <4$. The 2-loop electromagnetic current
correlation function is computed exactly for a general RQED$_{d_\gamma,d_e}$.
Focusing on RQED$_{4,3}$, the corresponding $\beta$-function is shown to vanish
which implies the scale invariance of the theory. Interaction correction to the
1-loop vacuum polarization, $\Pi_1$, of RQED$_{4,3}$ is found to be: $\Pi =
\Pi_1 (1 + 0.056 \al)$ where $\al$ is the fine structure constant. The scaling
dimension of the fermion field is computed at 1-loop and is shown to be
anomalous for RQED$_{4,3}$.
| [
{
"created": "Wed, 25 Apr 2012 14:14:59 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jun 2012 17:58:15 GMT",
"version": "v2"
}
] | 2012-11-12 | [
[
"Teber",
"S.",
""
]
] | We consider a theory of massless reduced quantum electrodynamics (RQED$_{d_\gamma,d_e}$), e.g., a quantum field theory where the U(1) gauge field lives in $d_\gamma$-spacetime dimensions while the fermionic field lives in a reduced spacetime of $d_e$ dimensions ($d_e \leqslant d_\gamma$). In the case where $d_\gamma=4$ such RQEDs are renormalizable while they are super-renormalizable for $d_\gamma <4$. The 2-loop electromagnetic current correlation function is computed exactly for a general RQED$_{d_\gamma,d_e}$. Focusing on RQED$_{4,3}$, the corresponding $\beta$-function is shown to vanish which implies the scale invariance of the theory. Interaction correction to the 1-loop vacuum polarization, $\Pi_1$, of RQED$_{4,3}$ is found to be: $\Pi = \Pi_1 (1 + 0.056 \al)$ where $\al$ is the fine structure constant. The scaling dimension of the fermion field is computed at 1-loop and is shown to be anomalous for RQED$_{4,3}$. |
1706.02456 | Debasish Borah | Debasish Borah, Arnab Dasgupta, Sudhanwa Patra | Neutrinoless double beta decay in minimal left-right symmetric model
with universal seesaw | 42 pages, 9 figures, to appear in Int. J. Mod. Phys. A | Int. J. Mod. Phys. A, 33 (2018) 1850198 | 10.1142/S0217751X18501981 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed discussion on neutrinoless double beta decay $(0\nu
\beta \beta)$ within left-right symmetric models based on the gauge symmetry of
type $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ as well as $SU(3)_L \times
SU(3)_R \times U(1)_{X}$ where fermion masses including that of neutrinos are
generated through a universal seesaw mechanism. We find that one or more of the
right-handed neutrinos could be as light as a few keV if left-right symmetry
breaking occurs in the range of a few TeV to 100 TeV. With such light
right-handed neutrinos, we perform a detailed study of new physics
contributions to $0\nu \beta \beta$ and constrain the model parameters from the
latest experimental bound on such a rare decay process. We find that the new
physics contribution to $0\nu \beta \beta$ in such a scenario, particularly the
heavy-light neutrino mixing diagrams, can individually saturate the existing
experimental bounds, but their contributions to total $0\nu \beta \beta$
half-life cancels each other due to unitarity of the total $6\times 6$ mass
matrix. The effective contribution to half-life therefore, arises from the
purely left and purely right neutrino and gauge boson mediated diagrams. We
find that the parameter space saturating the $0\nu \beta \beta$ bounds remain
allowed from the latest experimental bounds on charged lepton flavour violating
decays like $\mu \rightarrow e \gamma$. We finally include the bounds from
cosmology and supernova to constrain the parameter space of the model.
| [
{
"created": "Thu, 8 Jun 2017 06:32:41 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Nov 2018 16:47:39 GMT",
"version": "v2"
}
] | 2019-01-07 | [
[
"Borah",
"Debasish",
""
],
[
"Dasgupta",
"Arnab",
""
],
[
"Patra",
"Sudhanwa",
""
]
] | We present a detailed discussion on neutrinoless double beta decay $(0\nu \beta \beta)$ within left-right symmetric models based on the gauge symmetry of type $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ as well as $SU(3)_L \times SU(3)_R \times U(1)_{X}$ where fermion masses including that of neutrinos are generated through a universal seesaw mechanism. We find that one or more of the right-handed neutrinos could be as light as a few keV if left-right symmetry breaking occurs in the range of a few TeV to 100 TeV. With such light right-handed neutrinos, we perform a detailed study of new physics contributions to $0\nu \beta \beta$ and constrain the model parameters from the latest experimental bound on such a rare decay process. We find that the new physics contribution to $0\nu \beta \beta$ in such a scenario, particularly the heavy-light neutrino mixing diagrams, can individually saturate the existing experimental bounds, but their contributions to total $0\nu \beta \beta$ half-life cancels each other due to unitarity of the total $6\times 6$ mass matrix. The effective contribution to half-life therefore, arises from the purely left and purely right neutrino and gauge boson mediated diagrams. We find that the parameter space saturating the $0\nu \beta \beta$ bounds remain allowed from the latest experimental bounds on charged lepton flavour violating decays like $\mu \rightarrow e \gamma$. We finally include the bounds from cosmology and supernova to constrain the parameter space of the model. |
1604.08206 | Kathryn Zurek | Katelin Schutz, Kathryn M. Zurek | On the Detectability of Light Dark Matter with Superfluid Helium | 5 pages, 2 figures. v2: added references, updated fig 2 and
corresponding discussion with simulation data; conclusions unchanged | Phys. Rev. Lett. 117, 121302 (2016) | 10.1103/PhysRevLett.117.121302 | null | hep-ph astro-ph.CO cond-mat.other hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a two-excitation process in superfluid helium, combined with
sensitivity to meV energy depositions, can probe dark matter down to the ~keV
warm dark matter mass limit. This mass reach is three orders of magnitude below
what can be probed with ordinary nuclear recoils in helium at the same energy
resolution. For dark matter lighter than $\sim 100$ keV, the kinematics of the
process requires the two athermal excitations to have nearly equal and opposite
momentum, potentially providing a built-in coincidence mechanism for
controlling backgrounds.
| [
{
"created": "Wed, 27 Apr 2016 20:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Aug 2016 14:00:28 GMT",
"version": "v2"
}
] | 2016-09-21 | [
[
"Schutz",
"Katelin",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | We show that a two-excitation process in superfluid helium, combined with sensitivity to meV energy depositions, can probe dark matter down to the ~keV warm dark matter mass limit. This mass reach is three orders of magnitude below what can be probed with ordinary nuclear recoils in helium at the same energy resolution. For dark matter lighter than $\sim 100$ keV, the kinematics of the process requires the two athermal excitations to have nearly equal and opposite momentum, potentially providing a built-in coincidence mechanism for controlling backgrounds. |
hep-ph/0601108 | Teruaki Suyama | Teruaki Suyama, Takahiro Tanaka, Bruce Bassett, Hideaki Kudoh | Black hole production in tachyonic preheating | 6pages, 7figures, figures corrected | JCAP 0604 (2006) 001 | 10.1088/1475-7516/2006/04/001 | null | hep-ph astro-ph hep-th | null | We present fully non-linear simulations of a self-interacting scalar field in
the early universe undergoing tachyonic preheating. We find that density
perturbations on sub-horizon scales which are amplified by tachyonic
instability maintain long range correlations even during the succeeding
parametric resonance, in contrast to the standard models of preheating
dominated by parametric resonance. As a result the final spectrum exhibits
memory and is not universal in shape. We find that throughout the subsequent
era of parametric resonance the equation of state of the universe is almost
dust-like, hence the Jeans wavelength is much smaller than the horizon scale.
If our 2D simulations are accurate reflections of the situation in 3D, then
there are wide regions of parameter space ruled out by over-production of black
holes. It is likely however that realistic parameter values, consistent with
COBE/WMAP normalisation, are safetly outside this black hole over-production
region.
| [
{
"created": "Fri, 13 Jan 2006 11:46:01 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2006 09:15:24 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Suyama",
"Teruaki",
""
],
[
"Tanaka",
"Takahiro",
""
],
[
"Bassett",
"Bruce",
""
],
[
"Kudoh",
"Hideaki",
""
]
] | We present fully non-linear simulations of a self-interacting scalar field in the early universe undergoing tachyonic preheating. We find that density perturbations on sub-horizon scales which are amplified by tachyonic instability maintain long range correlations even during the succeeding parametric resonance, in contrast to the standard models of preheating dominated by parametric resonance. As a result the final spectrum exhibits memory and is not universal in shape. We find that throughout the subsequent era of parametric resonance the equation of state of the universe is almost dust-like, hence the Jeans wavelength is much smaller than the horizon scale. If our 2D simulations are accurate reflections of the situation in 3D, then there are wide regions of parameter space ruled out by over-production of black holes. It is likely however that realistic parameter values, consistent with COBE/WMAP normalisation, are safetly outside this black hole over-production region. |
1903.05973 | Ye Xing | Ye Xing, Fu-Sheng Yu, Ruilin Zhu | Weak Decays of Stable Open-bottom Tetraquark by SU(3) Symmetry Analysis | 53 pages, 2 figures | null | 10.1140/epjc/s10052-019-6882-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exotic state $X(5568)$ which was observed by D0 Collaboration is very
likely to be a tetraquark state with four different valence quark flavors,
though the existence was not confirmed by other collaborations. The possibility
of such state still generate lots of interests in theory. In the paper, we will
study the properties of the state under the SU(3) flavor symmetry. This four
quark state with a heavy bottom quark and three light quarks(anti-quark) can
form a $6$ or $\overline {15}$ representation. The weak decays can be dominant
and should be discussed carefully while such state is stable against the strong
interaction. Therefor we will study the multi-body semileptonic and nonleptonic
weak decays systematically. With the help of SU(3) flavor symmetry, we can give
the Hamiltonian in the hadronic level, then obtain the parameterized
irreducible amplitudes and the relations of different channels. At the end of
the article, we collect some Cabibbo allowed two-body and three-body weak decay
channels which can be used to reconstruct $X_{b6}$ states at the branching
fraction up to be $10^{-5}$.
| [
{
"created": "Thu, 14 Mar 2019 13:18:52 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Xing",
"Ye",
""
],
[
"Yu",
"Fu-Sheng",
""
],
[
"Zhu",
"Ruilin",
""
]
] | The exotic state $X(5568)$ which was observed by D0 Collaboration is very likely to be a tetraquark state with four different valence quark flavors, though the existence was not confirmed by other collaborations. The possibility of such state still generate lots of interests in theory. In the paper, we will study the properties of the state under the SU(3) flavor symmetry. This four quark state with a heavy bottom quark and three light quarks(anti-quark) can form a $6$ or $\overline {15}$ representation. The weak decays can be dominant and should be discussed carefully while such state is stable against the strong interaction. Therefor we will study the multi-body semileptonic and nonleptonic weak decays systematically. With the help of SU(3) flavor symmetry, we can give the Hamiltonian in the hadronic level, then obtain the parameterized irreducible amplitudes and the relations of different channels. At the end of the article, we collect some Cabibbo allowed two-body and three-body weak decay channels which can be used to reconstruct $X_{b6}$ states at the branching fraction up to be $10^{-5}$. |
hep-ph/9312323 | null | K.G.Chetyrkin, O.V.Tarasov | The $\alpha_s^3$ Corrections to the Effective Neutral Current and to the
Z Decay Rate in the Heavy Top Quark Limit | 11 pages, LATEX, no figures, Preprint TTP93-38,INR-842/93 , December
1993 | Phys.Lett. B327 (1994) 114-122 | 10.1016/0370-2693(94)91538-5 | null | hep-ph | null | We find the effective neutral current in the heavy top quark limit up to and
including the terms of order $\alpha_s^3$. The result is then employed to
compute the correction of the same order to the axial part of the Z decay rate
into hadrons ($\G^h_Z$) induced by the top-bottom quark mass splitting. The
calculations confirm the prediction made in a previous work of K.G.Ch. and
J.H.K\"uhn (Phys. Lett. B 308 (1993) 127), namely, the effect of the singlet
corrections of order $\alpha^3_s$ to the axial part of the $\G^h_Z$ should not
exceed 25\% - 30\% (depending on the values chosen for $\alpha_s(M_Z)$ and
$m_t$) of the magnitude of the leading (singlet) $\alpha_s^2$ term.
| [
{
"created": "Tue, 21 Dec 1993 19:32:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Tarasov",
"O. V.",
""
]
] | We find the effective neutral current in the heavy top quark limit up to and including the terms of order $\alpha_s^3$. The result is then employed to compute the correction of the same order to the axial part of the Z decay rate into hadrons ($\G^h_Z$) induced by the top-bottom quark mass splitting. The calculations confirm the prediction made in a previous work of K.G.Ch. and J.H.K\"uhn (Phys. Lett. B 308 (1993) 127), namely, the effect of the singlet corrections of order $\alpha^3_s$ to the axial part of the $\G^h_Z$ should not exceed 25\% - 30\% (depending on the values chosen for $\alpha_s(M_Z)$ and $m_t$) of the magnitude of the leading (singlet) $\alpha_s^2$ term. |
0908.3117 | Stefan Recksiegel | Stefan Recksiegel | Flavour Physics in the Littlest Higgs Model with T-Parity: Effects in
the K, B_d/s and D systems | Talk given at the Flavianet Workshop on Low energy constraints on
extensions of the Standard Model, 23-27 July 2009, Kazimierz, Poland | null | 10.1002/prop.201000004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Littlest Higgs Model with T parity (LHT) is an interesting alternative
model for New Physics at the TeV scale. Although Flavour Physics was not the
reason for creating the LHT model, significant effects (such as large CP
violation where not predicted by the SM) can be created without violating
existing experimental bounds. We study the B-, K- and especially the D-sector.
| [
{
"created": "Fri, 21 Aug 2009 12:52:24 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Recksiegel",
"Stefan",
""
]
] | The Littlest Higgs Model with T parity (LHT) is an interesting alternative model for New Physics at the TeV scale. Although Flavour Physics was not the reason for creating the LHT model, significant effects (such as large CP violation where not predicted by the SM) can be created without violating existing experimental bounds. We study the B-, K- and especially the D-sector. |
2008.04943 | Martin Beneke | Martin Beneke, Mathias Garny, Sebastian Jaskiewicz, Robert Szafron,
Leonardo Vernazza, Jian Wang | Large-x resummation of off-diagonal deep-inelastic parton scattering
from d-dimensional refactorization | 50 pages, LaTeX | null | 10.1007/JHEP10(2020)196 | TUM-HEP-1270/20, CERN-TH-2020-135 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The off-diagonal parton-scattering channels $g+\gamma^*$ and $q+\phi^*$ in
deep-inelastic scattering are power-suppressed near threshold $x\to 1$. We
address the next-to-leading power (NLP) resummation of large double logarithms
of $1-x$ to all orders in the strong coupling, which are present even in the
off-diagonal DGLAP splitting kernels. The appearance of divergent convolutions
prevents the application of factorization methods known from leading power
resummation. Employing $d$-dimensional consistency relations from requiring
$1/\epsilon$ pole cancellations in dimensional regularization between momentum
regions, we show that the resummation of the off-diagonal parton-scattering
channels at the leading logarithmic order can be bootstrapped from the recently
conjectured exponentiation of NLP soft-quark Sudakov logarithms. In particular,
we derive a result for the DGLAP kernel in terms of the series of Bernoulli
numbers found previously by Vogt directly from algebraic all-order expressions.
We identify the off-diagonal DGLAP splitting functions and soft-quark Sudakov
logarithms as inherent two-scale quantities in the large-$x$ limit. We use a
refactorization of these scales and renormalization group methods inspired by
soft-collinear effective theory to derive the conjectured soft-quark Sudakov
exponentiation formula.
| [
{
"created": "Tue, 11 Aug 2020 18:12:24 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Beneke",
"Martin",
""
],
[
"Garny",
"Mathias",
""
],
[
"Jaskiewicz",
"Sebastian",
""
],
[
"Szafron",
"Robert",
""
],
[
"Vernazza",
"Leonardo",
""
],
[
"Wang",
"Jian",
""
]
] | The off-diagonal parton-scattering channels $g+\gamma^*$ and $q+\phi^*$ in deep-inelastic scattering are power-suppressed near threshold $x\to 1$. We address the next-to-leading power (NLP) resummation of large double logarithms of $1-x$ to all orders in the strong coupling, which are present even in the off-diagonal DGLAP splitting kernels. The appearance of divergent convolutions prevents the application of factorization methods known from leading power resummation. Employing $d$-dimensional consistency relations from requiring $1/\epsilon$ pole cancellations in dimensional regularization between momentum regions, we show that the resummation of the off-diagonal parton-scattering channels at the leading logarithmic order can be bootstrapped from the recently conjectured exponentiation of NLP soft-quark Sudakov logarithms. In particular, we derive a result for the DGLAP kernel in terms of the series of Bernoulli numbers found previously by Vogt directly from algebraic all-order expressions. We identify the off-diagonal DGLAP splitting functions and soft-quark Sudakov logarithms as inherent two-scale quantities in the large-$x$ limit. We use a refactorization of these scales and renormalization group methods inspired by soft-collinear effective theory to derive the conjectured soft-quark Sudakov exponentiation formula. |
0707.2623 | Shi-Lin Zhu | Shi-Lin Zhu | Spectroscopy of Mesons with Heavy Quarks | Plenary talk at INPC2007, http://inpc2007.riken.jp/P/P5-zhu.pdf | Nucl.Phys.A805:221c-229c,2008 | 10.1016/j.nuclphysa.2008.02.251 | null | hep-ph hep-ex nucl-th | null | I will give a concise overview of mesons with heavy quarks including p-wave
charmed mesons and charmonium (or charmonium-like) states such as X(3872),
Y(4260), X(3940), Y(3940), Z(3930) etc. The effect from the nearby S-wave open
channels on the quark model spectrum is emphasized.
| [
{
"created": "Wed, 18 Jul 2007 02:03:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zhu",
"Shi-Lin",
""
]
] | I will give a concise overview of mesons with heavy quarks including p-wave charmed mesons and charmonium (or charmonium-like) states such as X(3872), Y(4260), X(3940), Y(3940), Z(3930) etc. The effect from the nearby S-wave open channels on the quark model spectrum is emphasized. |
1512.02508 | Rhorry Gauld | Rhorry Gauld, Benjamin D. Pecjak, and Darren J. Scott | One-loop corrections to $h\to b\bar b$ and $h\to \tau\bar \tau$ decays
in the Standard Model Dimension-6 EFT: four-fermion operators and the
large-$m_t$ limit | 38 pages. Matches journal version and includes extended discussion in
phenomenology section | null | 10.1007/JHEP05(2016)080 | DCPT/15/34, IPPP/15/17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate a set of one-loop corrections to $h\to b\bar b$ and $h\to
\tau\bar \tau$ decays in the dimension-6 Standard Model effective field theory
(SMEFT). In particular, working in the limit of vanishing gauge couplings, we
calculate directly in the broken phase of the theory all large logarithmic
corrections and in addition the finite corrections in the large-$m_t$ limit.
Moreover, we give exact results for one-loop contributions from four-fermion
operators. We obtain these corrections within an extension of the widely used
on-shell renormalisation scheme appropriate for SMEFT calculations, and show
explicitly how UV divergent bare amplitudes from a total of 21 different SMEFT
operators are rendered finite within this scheme. As a by-product of the
calculation, we also compute to one-loop order the logarithmically enhanced and
finite large-$m_t$ corrections to muon decay in the limit of vanishing gauge
couplings, which is necessary to implement the $G_F$ input parameter scheme
within the SMEFT.
| [
{
"created": "Tue, 8 Dec 2015 15:28:00 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2016 13:57:26 GMT",
"version": "v2"
}
] | 2016-10-26 | [
[
"Gauld",
"Rhorry",
""
],
[
"Pecjak",
"Benjamin D.",
""
],
[
"Scott",
"Darren J.",
""
]
] | We calculate a set of one-loop corrections to $h\to b\bar b$ and $h\to \tau\bar \tau$ decays in the dimension-6 Standard Model effective field theory (SMEFT). In particular, working in the limit of vanishing gauge couplings, we calculate directly in the broken phase of the theory all large logarithmic corrections and in addition the finite corrections in the large-$m_t$ limit. Moreover, we give exact results for one-loop contributions from four-fermion operators. We obtain these corrections within an extension of the widely used on-shell renormalisation scheme appropriate for SMEFT calculations, and show explicitly how UV divergent bare amplitudes from a total of 21 different SMEFT operators are rendered finite within this scheme. As a by-product of the calculation, we also compute to one-loop order the logarithmically enhanced and finite large-$m_t$ corrections to muon decay in the limit of vanishing gauge couplings, which is necessary to implement the $G_F$ input parameter scheme within the SMEFT. |
hep-ph/0505131 | Zoltan Nagy | Zoltan Nagy | Matching Parton Showers to NLO Computation | Presented at the 40th Rencontres de Moriond ''QCD and Hadronic
Interactions'', La Thuile, Aosta Valley, Italy, March 12th to 19th, 2005; 4
pages | null | 10.1088/1126-6708/2005/10/024 | null | hep-ph | null | In this review a new method is presented for attaching parton shower
algorithms to NLO partonic jet cross sections in electron-positron
annihilation. Our method is based on the Catani-Seymour dipole subtraction
method and also uses an adaptation of the matching scheme of Catani, Krauss,
Kuhn, and Webber.
| [
{
"created": "Sat, 14 May 2005 21:36:34 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nagy",
"Zoltan",
""
]
] | In this review a new method is presented for attaching parton shower algorithms to NLO partonic jet cross sections in electron-positron annihilation. Our method is based on the Catani-Seymour dipole subtraction method and also uses an adaptation of the matching scheme of Catani, Krauss, Kuhn, and Webber. |
hep-ph/0504257 | Angela Milliken | Gordon Kane | How Can We Go From Hadron Collider Data Toward the Underlying Theory
That Extends the Standard Model? After the Champagne | 9 pages, 2 figures, 1 table | Czech.J.Phys.55:B197-B204,2005 | null | null | hep-ph hep-ex hep-th | null | This is a composite based on talks at Physics at LHC, Vienna, July 2004,
TeV4LHC, Fermilab, Sept. 2004, and the String Phenomenology meeting, Perimeter
Institute, March 2005.
| [
{
"created": "Wed, 27 Apr 2005 12:41:49 GMT",
"version": "v1"
}
] | 2011-04-11 | [
[
"Kane",
"Gordon",
""
]
] | This is a composite based on talks at Physics at LHC, Vienna, July 2004, TeV4LHC, Fermilab, Sept. 2004, and the String Phenomenology meeting, Perimeter Institute, March 2005. |
hep-ph/0509158 | Marat Siddikov Ilfatovich | V. Guzey, M.Siddikov | On the A-dependence of nuclear generalized parton distributions | Final version published in J. Phys. G. 17 pages, 9 figures | J.Phys. G32 (2006) 251-268 | 10.1088/0954-3899/32/3/002 | RUB-TPII-08/2005 | hep-ph | null | We perform a microscopic evaluation of nuclear GPDs for spin-0 nuclei in the
framework of the Walecka model. We demonstrate that the meson (non-nucleon)
degrees of freedom dramatically influence nuclear GPDs, which is revealed in
the non-trivial and unexpected A-dependence of DVCS observables. In particular,
we find that the first moment of the nuclear D-term, d_A(0) ~ A^2.26, which
confirms the earlier prediction of M.Polyakov. We find that in the HERMES
kinematics, contrary to the free proton case, the nuclear meson degrees of
freedom in large nuclei enhance the nuclear DVCS amplitude which becomes
comparable to the Bethe-Heitler amplitude, and, thus, give the non-trivial
A-dependence to the DVCS asymmetries: as a function of the atomic number the
beam-charge asymmetry increases whereas the beam-spin asymmetry decreases
slowly.
| [
{
"created": "Thu, 15 Sep 2005 14:33:49 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2006 09:22:34 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Guzey",
"V.",
""
],
[
"Siddikov",
"M.",
""
]
] | We perform a microscopic evaluation of nuclear GPDs for spin-0 nuclei in the framework of the Walecka model. We demonstrate that the meson (non-nucleon) degrees of freedom dramatically influence nuclear GPDs, which is revealed in the non-trivial and unexpected A-dependence of DVCS observables. In particular, we find that the first moment of the nuclear D-term, d_A(0) ~ A^2.26, which confirms the earlier prediction of M.Polyakov. We find that in the HERMES kinematics, contrary to the free proton case, the nuclear meson degrees of freedom in large nuclei enhance the nuclear DVCS amplitude which becomes comparable to the Bethe-Heitler amplitude, and, thus, give the non-trivial A-dependence to the DVCS asymmetries: as a function of the atomic number the beam-charge asymmetry increases whereas the beam-spin asymmetry decreases slowly. |
1912.12501 | Alexander Studenikin | Alexander Studenikin | Electromagnetic neutrinos: New constraints and new effects in
oscillations | 4 pages in LaTex, to appear in the proceedings of the 16th
International Conference on Topics in Astroparticle and Underground Physics
(TAUP 2019), 9-13 September 2019, Toyama, Japan. arXiv admin note:
substantial text overlap with arXiv:1801.08887, arXiv:1912.12497 | Journal of Physics: Conference Series 1468 (2020) 012196 | 10.1088/1742-6596/1468/1/012196 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A short overview of neutrino electromagnetic properties with focus on existed
experimental constraints and future prospects is presented. The related new
effect in neutrino flavour and spin-flavour oscillations in the transversal
matter currents is introduced.
| [
{
"created": "Sat, 28 Dec 2019 18:26:13 GMT",
"version": "v1"
}
] | 2020-04-10 | [
[
"Studenikin",
"Alexander",
""
]
] | A short overview of neutrino electromagnetic properties with focus on existed experimental constraints and future prospects is presented. The related new effect in neutrino flavour and spin-flavour oscillations in the transversal matter currents is introduced. |
hep-ph/0011054 | Orlando Luis Goulart Peres | O. L. G. Peres and A. Yu. Smirnov | (3+1)-spectrum of neutrino masses: A chance for LSND? | 41 pages, Latex, uses epsfig. Corrected misprints | Nucl.Phys. B599 (2001) 3 | 10.1016/S0550-3213(01)00012-8 | null | hep-ph hep-ex | null | If active to active neutrino transitions are dominant modes of the
atmospheric ($\nu_{\mu} \to \nu_{\tau}$) and the solar neutrino oscillations
($\nu_{e}\to \nu_{\mu}/\nu_{\tau}$), as is indicated by recent data, the
favoured scheme which accommodates the LSND result - the so called (2+2)-scheme
- should be discarded. We introduce the parameters $\eta_s^{atm}$ and
$\eta_s^{sun}$ which quantify an involvement of the sterile component in the
solar and atmospheric neutrino oscillations. The (2+2)-scheme predicts
$\eta_s^{atm} + \eta_s^{sun} = 1$ and the experimental proof of deviation from
this equality will discriminate the scheme. In this connection the (3+1)-scheme
is revisited in which the fourth (predominantly sterile) neutrino is isolated
from a block of three flavour neutrinos by the mass gap $\Delta m^2_{LSND} \sim
(0.4-10)$ eV$^2$. We find that in the (3+1)-scheme the LSND result can be
reconciled with existing bounds on $\nu_e$- and $\nu_{\mu}$ - disappearance at
95-99 % C.L.. The generic prediction of the scheme is the $\nu_e$- and
$\nu_{\mu}$ - disappearance probabilities at the level of present experimental
bounds. The possibility to strengthen the bound on $\nu_{\mu}$- disappearance
in the KEK - front detector experiment is studied. We consider phenomenology of
the (3 + 1)-scheme, in particular, its implications for the atmospheric
neutrinos, neutrinoless double beta decay searches, supernova neutrinos and
primordial nucleosynthesis.
| [
{
"created": "Fri, 3 Nov 2000 17:31:05 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2000 18:32:25 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jan 2001 13:55:12 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Peres",
"O. L. G.",
""
],
[
"Smirnov",
"A. Yu.",
""
]
] | If active to active neutrino transitions are dominant modes of the atmospheric ($\nu_{\mu} \to \nu_{\tau}$) and the solar neutrino oscillations ($\nu_{e}\to \nu_{\mu}/\nu_{\tau}$), as is indicated by recent data, the favoured scheme which accommodates the LSND result - the so called (2+2)-scheme - should be discarded. We introduce the parameters $\eta_s^{atm}$ and $\eta_s^{sun}$ which quantify an involvement of the sterile component in the solar and atmospheric neutrino oscillations. The (2+2)-scheme predicts $\eta_s^{atm} + \eta_s^{sun} = 1$ and the experimental proof of deviation from this equality will discriminate the scheme. In this connection the (3+1)-scheme is revisited in which the fourth (predominantly sterile) neutrino is isolated from a block of three flavour neutrinos by the mass gap $\Delta m^2_{LSND} \sim (0.4-10)$ eV$^2$. We find that in the (3+1)-scheme the LSND result can be reconciled with existing bounds on $\nu_e$- and $\nu_{\mu}$ - disappearance at 95-99 % C.L.. The generic prediction of the scheme is the $\nu_e$- and $\nu_{\mu}$ - disappearance probabilities at the level of present experimental bounds. The possibility to strengthen the bound on $\nu_{\mu}$- disappearance in the KEK - front detector experiment is studied. We consider phenomenology of the (3 + 1)-scheme, in particular, its implications for the atmospheric neutrinos, neutrinoless double beta decay searches, supernova neutrinos and primordial nucleosynthesis. |
1709.07331 | Ivan Aleksandrov | I. A. Aleksandrov, G. Plunien, V. M. Shabaev | Momentum distribution of particles created in space-time-dependent
colliding laser pulses | 8 pages, 9 figures (including proof corrections) | Phys. Rev. D 96, 076006 (2017) | 10.1103/PhysRevD.96.076006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the pair-production process in the presence of two
counterpropagating linearly polarized short laser pulses. By means of a
nonperturbative technique, we take into account the full coordinate dependence
of the external field going beyond the dipole and standing-wave approximations.
In particular, we analyze the momentum distribution of particles created. It is
demonstrated that the spatial variations of the laser pulses may play a crucial
role. The more accurate treatment reveals a number of prominent features: the
pair-production probabilities become considerably smaller, the quantitative
behavior of the momentum spectra changes dramatically, and the pulse shape
effects become much less pronounced. The results of our study are expected to
be very important for future theoretical and experimental investigations.
| [
{
"created": "Thu, 21 Sep 2017 13:58:58 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 2017 16:12:50 GMT",
"version": "v2"
}
] | 2017-11-10 | [
[
"Aleksandrov",
"I. A.",
""
],
[
"Plunien",
"G.",
""
],
[
"Shabaev",
"V. M.",
""
]
] | We study the pair-production process in the presence of two counterpropagating linearly polarized short laser pulses. By means of a nonperturbative technique, we take into account the full coordinate dependence of the external field going beyond the dipole and standing-wave approximations. In particular, we analyze the momentum distribution of particles created. It is demonstrated that the spatial variations of the laser pulses may play a crucial role. The more accurate treatment reveals a number of prominent features: the pair-production probabilities become considerably smaller, the quantitative behavior of the momentum spectra changes dramatically, and the pulse shape effects become much less pronounced. The results of our study are expected to be very important for future theoretical and experimental investigations. |
1101.5175 | Thomas Mehen | Thomas Mehen and Roxanne Springer (Duke U.) | Radiative Decays X(3872) -> psi(2S)+gamma and psi(4040) -> X(3872)+gamma
in Effective Field Theory | 13 pages, 4 figures | Phys.Rev.D83:094009,2011 | 10.1103/PhysRevD.83.094009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy hadron chiral perturbation theory (HHchiPT) and XEFT are applied to the
decays X(3872) -> psi(2S) + gamma and psi(4040) -> X(3872) + gamma under the
assumption that the X(3872) is a molecular bound state of neutral charm mesons.
In these decays the emitted photon energies are 181 MeV and 165 MeV,
respectively, so HHchiPT can be used to calculate the underlying D^0
bar{D}^{0*}+ bar{D}^0 D^{0*} -> psi(2S) + gamma or psi(4040) -> (D^0
bar{D}^{0*}+ bar{D}^0 D^{0*}) + gamma transition. These amplitudes are matched
onto XEFT to obtain decay rates. The decays receive contributions from both
long distance and short distance processes. We study the polarization of the
psi(2S) in the decay X(3872) -> psi(2S) + gamma and the angular distribution of
X(3872) in the decay psi(4040) -> X(3872) + gamma and find they can be used to
differentiate between different decay mechanisms as well as discriminate
between 2^{-+} and 1^{++} quantum number assignments of the X(3872).
| [
{
"created": "Wed, 26 Jan 2011 21:50:00 GMT",
"version": "v1"
}
] | 2015-03-18 | [
[
"Mehen",
"Thomas",
"",
"Duke U."
],
[
"Springer",
"Roxanne",
"",
"Duke U."
]
] | Heavy hadron chiral perturbation theory (HHchiPT) and XEFT are applied to the decays X(3872) -> psi(2S) + gamma and psi(4040) -> X(3872) + gamma under the assumption that the X(3872) is a molecular bound state of neutral charm mesons. In these decays the emitted photon energies are 181 MeV and 165 MeV, respectively, so HHchiPT can be used to calculate the underlying D^0 bar{D}^{0*}+ bar{D}^0 D^{0*} -> psi(2S) + gamma or psi(4040) -> (D^0 bar{D}^{0*}+ bar{D}^0 D^{0*}) + gamma transition. These amplitudes are matched onto XEFT to obtain decay rates. The decays receive contributions from both long distance and short distance processes. We study the polarization of the psi(2S) in the decay X(3872) -> psi(2S) + gamma and the angular distribution of X(3872) in the decay psi(4040) -> X(3872) + gamma and find they can be used to differentiate between different decay mechanisms as well as discriminate between 2^{-+} and 1^{++} quantum number assignments of the X(3872). |
hep-ph/9402288 | Mannel Thomas | Thomas Mannel and Matthias Neubert | Resummation of Nonperturbative Corrections to the Lepton Spectrum in
Inclusive $B\to X\,\ell\,\bar\nu$ Decays | 22 pages, five figures appended after \end{document} as uu-encoded
and compressed eps files, uses epsf, CERN-TH.7156/94 | Phys.Rev.D50:2037-2047,1994 | 10.1103/PhysRevD.50.2037 | null | hep-ph | null | We apply the operator product expansion to resum the leading nonperturbative
corrections to the endpoint region of the lepton spectrum in inclusive
semileptonic $B\to X_q\,\ell\,\bar\nu$ decays, taking into account a finite
quark mass $m_q$ in the final state. We show that both for $b\to c$ and $b\to
u$ transitions, it is consistent to describe these effects by a convolution of
the parton model spectrum with a fundamental light-cone structure function. The
moments of this function are proportional to forward matrix elements of
higher-dimension operators. The prospects for an extraction of the structure
function from a measurement of the lepton spectrum are discussed.
| [
{
"created": "Tue, 15 Feb 1994 10:35:49 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Mannel",
"Thomas",
""
],
[
"Neubert",
"Matthias",
""
]
] | We apply the operator product expansion to resum the leading nonperturbative corrections to the endpoint region of the lepton spectrum in inclusive semileptonic $B\to X_q\,\ell\,\bar\nu$ decays, taking into account a finite quark mass $m_q$ in the final state. We show that both for $b\to c$ and $b\to u$ transitions, it is consistent to describe these effects by a convolution of the parton model spectrum with a fundamental light-cone structure function. The moments of this function are proportional to forward matrix elements of higher-dimension operators. The prospects for an extraction of the structure function from a measurement of the lepton spectrum are discussed. |
2006.03383 | Yoshihiro Shigekami | Shao-Long Chen, Amit Dutta Banik, Zhaofeng Kang, Qin Qin, Yoshihiro
Shigekami | Signatures of a Flavor Changing $Z'$ Boson in $B_q \to \gamma Z'$ | 23 pages, 14 figures | null | 10.1016/j.nuclphysb.2020.115237 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rare $B$ meson decays offer an opportunity to probe a light hidden $Z'$
boson. In this work we explore a new channel $B_q \to \gamma Z'$ ($q = d, s$)
followed by a cascade decay of $Z'$ into an invisible (neutrino or dark matter)
or charged lepton pair $\ell^+ \ell^-$ ($\ell=e ,\mu)$. The study is based on a
simplified effective model where the down quark sector has tiny flavor-changing
neutral current couplings with $Z'$. For the first time, we calculate ${\rm
BR}(B_q \to \gamma Z')$ at the leading power of $1/m_b$ and $1/E_\gamma$.
Confronting with the strong constraints from semi-invisible decays of $B$
meson, we find that the branching ratio for $B_d \to {\rm invisible} + \gamma$
can be larger than its Standard Model prediction, leaving a large room for new
physics, in particular for light dark matter. Additionally, the branching ratio
for $B_d \to e^+ e^- \gamma$ can also be sizable when the corresponding flavor
violating $Z'$ coupling to quarks is of the axial-vector type. On the other
hand, the predicted branching ratios of $B_d \to \mu^+ \mu^- \gamma$ and $B_s
\to \ell^+ \ell^- \gamma$ are severely constrained by the experimental
measurements.
| [
{
"created": "Fri, 5 Jun 2020 11:43:04 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 2020 07:03:41 GMT",
"version": "v2"
}
] | 2020-12-30 | [
[
"Chen",
"Shao-Long",
""
],
[
"Banik",
"Amit Dutta",
""
],
[
"Kang",
"Zhaofeng",
""
],
[
"Qin",
"Qin",
""
],
[
"Shigekami",
"Yoshihiro",
""
]
] | Rare $B$ meson decays offer an opportunity to probe a light hidden $Z'$ boson. In this work we explore a new channel $B_q \to \gamma Z'$ ($q = d, s$) followed by a cascade decay of $Z'$ into an invisible (neutrino or dark matter) or charged lepton pair $\ell^+ \ell^-$ ($\ell=e ,\mu)$. The study is based on a simplified effective model where the down quark sector has tiny flavor-changing neutral current couplings with $Z'$. For the first time, we calculate ${\rm BR}(B_q \to \gamma Z')$ at the leading power of $1/m_b$ and $1/E_\gamma$. Confronting with the strong constraints from semi-invisible decays of $B$ meson, we find that the branching ratio for $B_d \to {\rm invisible} + \gamma$ can be larger than its Standard Model prediction, leaving a large room for new physics, in particular for light dark matter. Additionally, the branching ratio for $B_d \to e^+ e^- \gamma$ can also be sizable when the corresponding flavor violating $Z'$ coupling to quarks is of the axial-vector type. On the other hand, the predicted branching ratios of $B_d \to \mu^+ \mu^- \gamma$ and $B_s \to \ell^+ \ell^- \gamma$ are severely constrained by the experimental measurements. |
2211.01789 | Daiki Suenaga | Daiki Suenaga, Kotaro Murakami, Etsuko Itou, and Kei Iida | Probing the hadron mass spectrum in dense two-color QCD with the linear
sigma model | 16 pages, 6 figures | Phys.Rev.D 107, 054001 (2023) | 10.1103/PhysRevD.107.054001 | RIKEN-iTHEMS-Report-22, YITP-22-127 | hep-ph hep-lat nucl-th | http://creativecommons.org/licenses/by/4.0/ | We investigate modifications of hadron masses at finite quark chemical
potential in two-flavor and two-color QCD, of which the data are available from
lattice simulations, within a linear sigma model based on approximate
Pauli-Gursey $SU(4)$ symmetry. The model describes not only ground-state scalar
diquarks and pseudo-scalar mesons but also the excited pseudo-scalar diquarks
and scalar mesons; each ground-state diquark (meson) has the corresponding
excited diquark (hadron) with opposite parity as a chiral partner. Effects of
chiral symmetry breaking and diquark condensates are incorporated by a
mean-field treatment. We show that various mixings among the hadrons, which are
triggered by the breakdown of baryon number conservation in the superfluid
phase, lead to a rich hadron mass spectrum. We discuss the influence of
$U(1)_A$ anomaly on the density dependence of the mass spectrum and also
manifestations of the chiral partner structures as density increases in the
superfluid phase. The predicted hadron masses are expected to provide future
lattice simulations with useful information on such symmetry properties in
dense two-color QCD.
| [
{
"created": "Thu, 3 Nov 2022 13:23:25 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Mar 2023 07:08:36 GMT",
"version": "v2"
}
] | 2023-03-06 | [
[
"Suenaga",
"Daiki",
""
],
[
"Murakami",
"Kotaro",
""
],
[
"Itou",
"Etsuko",
""
],
[
"Iida",
"Kei",
""
]
] | We investigate modifications of hadron masses at finite quark chemical potential in two-flavor and two-color QCD, of which the data are available from lattice simulations, within a linear sigma model based on approximate Pauli-Gursey $SU(4)$ symmetry. The model describes not only ground-state scalar diquarks and pseudo-scalar mesons but also the excited pseudo-scalar diquarks and scalar mesons; each ground-state diquark (meson) has the corresponding excited diquark (hadron) with opposite parity as a chiral partner. Effects of chiral symmetry breaking and diquark condensates are incorporated by a mean-field treatment. We show that various mixings among the hadrons, which are triggered by the breakdown of baryon number conservation in the superfluid phase, lead to a rich hadron mass spectrum. We discuss the influence of $U(1)_A$ anomaly on the density dependence of the mass spectrum and also manifestations of the chiral partner structures as density increases in the superfluid phase. The predicted hadron masses are expected to provide future lattice simulations with useful information on such symmetry properties in dense two-color QCD. |
1601.03469 | M.I. Vyazovsky | M.A. Braun and M.I. Vyazovsky (Saint-Petersburg State University,
Russia) | Reggeon-gluon vertices with Ward identities | 19 pages, 7 figures; to be published in Phys. Rev. D | Phys. Rev. D 93, 065026 (2016) | 10.1103/PhysRevD.93.065026 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ward identities for reggeons are studied in the framework of effective action
approach to the QCD in Regge kinematics. It is shown that they require
introduction of new contributions not present in the reggeon diagrams
initially. Application to vertices RR$\to$RP and RR$\to$RRP are considered and
diagrams which have to be added to the QCD ones are found.
| [
{
"created": "Thu, 14 Jan 2016 02:51:58 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Feb 2016 17:50:07 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Feb 2016 18:39:29 GMT",
"version": "v3"
}
] | 2016-03-23 | [
[
"Braun",
"M. A.",
"",
"Saint-Petersburg State University,\n Russia"
],
[
"Vyazovsky",
"M. I.",
"",
"Saint-Petersburg State University,\n Russia"
]
] | Ward identities for reggeons are studied in the framework of effective action approach to the QCD in Regge kinematics. It is shown that they require introduction of new contributions not present in the reggeon diagrams initially. Application to vertices RR$\to$RP and RR$\to$RRP are considered and diagrams which have to be added to the QCD ones are found. |
hep-ph/9506421 | Mike Seymour | Michael H. Seymour, CERN | Jets in QCD | 20 pages, 13 figures, typeset using REVTeX and aipbook.sty, slightly
reformatted to improve page breaks. Talk given at the 10th Topical Workshop
on Proton-Antiproton Collider Physics, Batavia, IL, May 9-13, 1995. A
postscript version of this paper can be obtained from
http://surya11.cern.ch/users/seymour/pubs/pbarp.ps.Z | AIP Conf.Proc.357:568-587,1996 | 10.1063/1.49625 | CERN-TH/95-176 | hep-ph | null | Many analyses at the collider utilize the hadronic jets that are the
footprints of QCD partons. These are used both to study the QCD processes
themselves and increasingly as tools to study other physics, for example top
mass reconstruction. However, jets are not fundamental degrees of freedom in
the theory, so we need an {\em operational jet definition} and {\em reliable
methods to calculate their properties}. This talk covers both of these
important areas of jet physics.
| [
{
"created": "Mon, 26 Jun 1995 13:30:52 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 1995 16:29:21 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Seymour",
"Michael H.",
""
],
[
"CERN",
"",
""
]
] | Many analyses at the collider utilize the hadronic jets that are the footprints of QCD partons. These are used both to study the QCD processes themselves and increasingly as tools to study other physics, for example top mass reconstruction. However, jets are not fundamental degrees of freedom in the theory, so we need an {\em operational jet definition} and {\em reliable methods to calculate their properties}. This talk covers both of these important areas of jet physics. |
1801.07557 | Eduard Seifert | Eduard Seifert, Wolfgang Cassing | Baryon-antibaryon dynamics in relativistic heavy-ion collisions | 12 pages, 12 figures; Subsection III B added; Phys. Rev. C, in print | Phys. Rev. C 97, 044907 (2018) | 10.1103/PhysRevC.97.044907 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of baryon-antibaryon annihilation and reproduction ($B{\bar B}
\leftrightarrow 3 M$) is studied within the Parton-Hadron-String Dynamics
(PHSD) transport approach for Pb+Pb and Au+Au collisions as a function of
centrality from lower Super Proton Synchrotron (SPS) up to Large Hadron
Collider (LHC) energies on the basis of the quark rearrangement model (QRM). At
Relativistic Heavy-Ion Collider (RHIC) energies we find a small net reduction
of baryon-antibaryon ($B {\bar B}$) pairs while for the LHC energy of
$\sqrt{s_{NN}}$ = 2.76 GeV a small net enhancement is found relative to
calculations without annihilation (and reproduction) channels. Accordingly, the
sizeable difference between data and statistical calculations in Pb+Pb
collisions at $\sqrt{s_{NN}}$= 2.76 TeV for proton and antiproton yields
\cite{53}, where a deviation of 2.7 $\sigma$ was claimed by the ALICE
Collaboration, should not be attributed to a net antiproton annihilation. This
is in line with the observation that no substantial deviation between the data
and statistical hadronization model (SHM) calculations is seen for
antihyperons, since according to the PHSD analysis the antihyperons should be
modified by the same amount as antiprotons. As the PHSD results for particle
ratios are in line with the ALICE data (within error bars) this might point
towards a deviation from statistical equilibrium in the hadronization (at least
for protons/antiprotons). Furthermore, we find that the $B {\bar B}
\leftrightarrow 3 M$ reactions are more effective at lower SPS energies where a
net suppression for antiprotons and antihyperons up to a factor of 2 -- 2.5 can
be extracted from the PHSD calculations for central Au+Au collisions.
| [
{
"created": "Tue, 23 Jan 2018 14:26:03 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2018 12:51:26 GMT",
"version": "v2"
}
] | 2018-04-25 | [
[
"Seifert",
"Eduard",
""
],
[
"Cassing",
"Wolfgang",
""
]
] | The dynamics of baryon-antibaryon annihilation and reproduction ($B{\bar B} \leftrightarrow 3 M$) is studied within the Parton-Hadron-String Dynamics (PHSD) transport approach for Pb+Pb and Au+Au collisions as a function of centrality from lower Super Proton Synchrotron (SPS) up to Large Hadron Collider (LHC) energies on the basis of the quark rearrangement model (QRM). At Relativistic Heavy-Ion Collider (RHIC) energies we find a small net reduction of baryon-antibaryon ($B {\bar B}$) pairs while for the LHC energy of $\sqrt{s_{NN}}$ = 2.76 GeV a small net enhancement is found relative to calculations without annihilation (and reproduction) channels. Accordingly, the sizeable difference between data and statistical calculations in Pb+Pb collisions at $\sqrt{s_{NN}}$= 2.76 TeV for proton and antiproton yields \cite{53}, where a deviation of 2.7 $\sigma$ was claimed by the ALICE Collaboration, should not be attributed to a net antiproton annihilation. This is in line with the observation that no substantial deviation between the data and statistical hadronization model (SHM) calculations is seen for antihyperons, since according to the PHSD analysis the antihyperons should be modified by the same amount as antiprotons. As the PHSD results for particle ratios are in line with the ALICE data (within error bars) this might point towards a deviation from statistical equilibrium in the hadronization (at least for protons/antiprotons). Furthermore, we find that the $B {\bar B} \leftrightarrow 3 M$ reactions are more effective at lower SPS energies where a net suppression for antiprotons and antihyperons up to a factor of 2 -- 2.5 can be extracted from the PHSD calculations for central Au+Au collisions. |
1604.01127 | Natsumi Nagata | Tony Gherghetta, Natsumi Nagata, and Mikhail Shifman | A Visible QCD Axion from an Enlarged Color Group | 27 pages, 3 figures; v2: minor corrections, an explanatory remark and
references added; v3: journal version | Phys. Rev. D 93, 115010 (2016) | 10.1103/PhysRevD.93.115010 | UMN-TH-3522/16, FTPI-MINN-16/11 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of an enlarged QCD color group, SU(3+$N^\prime$)
spontaneously broken to SU(3)$_c\times$SU($N^\prime$) with extra vector-like
quarks transforming in the fundamental representation. When the heavy quarks
are integrated out below the PQ-breaking scale, they generate an axion coupling
which simultaneously solves the strong CP problem for both gauge groups.
However, the axion mass now receives a new nonperturbative contribution from
the SU($N^\prime$) confinement scale, which can be substantially larger than
the QCD scale. This can increase the axion mass to be at or above the
electroweak scale. This visible axion can then decay into gluons and photons
giving rise to observable signals at Run-II of the LHC. In particular, if the
mass is identified with the 750 GeV diphoton resonance then the new confinement
scale is $\sim$ TeV and the PQ-breaking scale is $\sim$ 10 TeV. This predicts
vector-like quarks and a PQ scalar resonance in the multi-TeV range, with the
possibility that dark matter is an SU($N^\prime$) baryon.
| [
{
"created": "Tue, 5 Apr 2016 03:44:55 GMT",
"version": "v1"
},
{
"created": "Sat, 7 May 2016 02:54:58 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Jun 2016 16:55:53 GMT",
"version": "v3"
}
] | 2016-06-15 | [
[
"Gherghetta",
"Tony",
""
],
[
"Nagata",
"Natsumi",
""
],
[
"Shifman",
"Mikhail",
""
]
] | We consider the possibility of an enlarged QCD color group, SU(3+$N^\prime$) spontaneously broken to SU(3)$_c\times$SU($N^\prime$) with extra vector-like quarks transforming in the fundamental representation. When the heavy quarks are integrated out below the PQ-breaking scale, they generate an axion coupling which simultaneously solves the strong CP problem for both gauge groups. However, the axion mass now receives a new nonperturbative contribution from the SU($N^\prime$) confinement scale, which can be substantially larger than the QCD scale. This can increase the axion mass to be at or above the electroweak scale. This visible axion can then decay into gluons and photons giving rise to observable signals at Run-II of the LHC. In particular, if the mass is identified with the 750 GeV diphoton resonance then the new confinement scale is $\sim$ TeV and the PQ-breaking scale is $\sim$ 10 TeV. This predicts vector-like quarks and a PQ scalar resonance in the multi-TeV range, with the possibility that dark matter is an SU($N^\prime$) baryon. |
hep-ph/9504218 | Sasaki Ken | Kuninori Horikawa and Ken Sasaki | Muonium-Antimuonium Conversion in Models with Dilepton Gauge Bosons | 12 pages, plain LATEX, 3 figures not included, available upon request
from the authors | Phys.Rev. D53 (1996) 560-563 | 10.1103/PhysRevD.53.560 | YNU-HEPTh-107 | hep-ph | null | We examine the magnetic field dependence of the muonium($\mu^+ e^-$) -
antimuonium($\mu^- e^+$) conversion in the models which accommodate the
dilepton gauge bosons. The effective Hamiltonian for the conversion due to
dileptons turns out to be in the $(V-A)\times(V+A)$ form and, in consequence,
the conversion probability is rather insensitive to the strength of the
magnetic field. The reduction is less than $20\%$ for up to $B \approx 300$ G
and $33\%$ even in the large $B$ limit.
| [
{
"created": "Tue, 4 Apr 1995 15:48:35 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Horikawa",
"Kuninori",
""
],
[
"Sasaki",
"Ken",
""
]
] | We examine the magnetic field dependence of the muonium($\mu^+ e^-$) - antimuonium($\mu^- e^+$) conversion in the models which accommodate the dilepton gauge bosons. The effective Hamiltonian for the conversion due to dileptons turns out to be in the $(V-A)\times(V+A)$ form and, in consequence, the conversion probability is rather insensitive to the strength of the magnetic field. The reduction is less than $20\%$ for up to $B \approx 300$ G and $33\%$ even in the large $B$ limit. |
1201.5702 | Shigeru Odaka | Shigeru Odaka | GR@PPA 2.8.3 update | 6 pages, 2 figures; minor changes | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GR@PPA 2.8 is a program package including event generators for single and
double weak-boson production processes at hadron collisions, in which a jet
matching method is implemented for simulating the weak-boson kinematics in the
entire phase space. Since the initial release in November, 2010, several
improvements have been applied to the program components. This report describes
the improvements and changes applied so far, up to the 2.8.3 release.
| [
{
"created": "Fri, 27 Jan 2012 05:22:52 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2012 03:06:07 GMT",
"version": "v2"
}
] | 2012-02-20 | [
[
"Odaka",
"Shigeru",
""
]
] | GR@PPA 2.8 is a program package including event generators for single and double weak-boson production processes at hadron collisions, in which a jet matching method is implemented for simulating the weak-boson kinematics in the entire phase space. Since the initial release in November, 2010, several improvements have been applied to the program components. This report describes the improvements and changes applied so far, up to the 2.8.3 release. |
2307.04236 | Peihong Gu | Pei-Hong Gu | Heavy axions from twin dark sectors with $\bar{\theta}$-characterized
mirror symmetry | 4 pages. arXiv admin note: text overlap with arXiv:2211.11730 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD Lagrangian contains a CP violating gluon density term with a physical
coefficient $\bar{\theta}$. The upper bound on the electric dipole moment of
neutron implies that the value of $\bar{\theta}$ should be extremely small
rather than the theoretically expected order of unity. The tiny $\bar{\theta}$
is commonly known as the strong CP problem. In order to solve this puzzle, we
construct a $\bar{\theta}$-characterized mirror symmetry between a pair of twin
dark sectors with respective discrete symmetries. By taking a proper phase
rotation of dark fields, we can perfectly remove the parameter $\bar{\theta}$
from the full Lagrangian. In our scenario, the discrete symmetry breaking,
which are responsible for the mass generation of dark colored fermions and dark
matter fermions, can be allowed near the TeV scale. This means different
phenomena from the popular axion models with high scale Peccei-Quinn global
symmetry breaking.
| [
{
"created": "Sun, 9 Jul 2023 17:53:32 GMT",
"version": "v1"
}
] | 2023-07-11 | [
[
"Gu",
"Pei-Hong",
""
]
] | The QCD Lagrangian contains a CP violating gluon density term with a physical coefficient $\bar{\theta}$. The upper bound on the electric dipole moment of neutron implies that the value of $\bar{\theta}$ should be extremely small rather than the theoretically expected order of unity. The tiny $\bar{\theta}$ is commonly known as the strong CP problem. In order to solve this puzzle, we construct a $\bar{\theta}$-characterized mirror symmetry between a pair of twin dark sectors with respective discrete symmetries. By taking a proper phase rotation of dark fields, we can perfectly remove the parameter $\bar{\theta}$ from the full Lagrangian. In our scenario, the discrete symmetry breaking, which are responsible for the mass generation of dark colored fermions and dark matter fermions, can be allowed near the TeV scale. This means different phenomena from the popular axion models with high scale Peccei-Quinn global symmetry breaking. |
hep-ph/0606196 | Qiang Zhao | Qiang Zhao and Bing-Song Zou | On the near-threshold enhancement in $J/\psi\to \gamma X$ with
$X\to\omega\phi$ | 12 pages, 6 figures; Version to appear in Phys. Rev. D | Phys.Rev.D74:114025,2006 | 10.1103/PhysRevD.74.114025 | null | hep-ph hep-ex nucl-th | null | We investigate the possibility of producing the enhancement observed in
$J/\psi\to \gamma X$ with $X\to \omega\phi $ at BES by intermediate meson
rescatterings through $f_0(1710)\to PP\to \omega\phi$, $f_0(1710)\to VV\to
\omega\phi$, and $f_0(1710)\to SS\to \omega\phi$. We find that intermediate
meson rescatterings can produce some enhancement near the $\omega\phi$
threshold. Implications about the property of this enhancement are discussed.
| [
{
"created": "Mon, 19 Jun 2006 13:14:54 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2006 19:32:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Zhao",
"Qiang",
""
],
[
"Zou",
"Bing-Song",
""
]
] | We investigate the possibility of producing the enhancement observed in $J/\psi\to \gamma X$ with $X\to \omega\phi $ at BES by intermediate meson rescatterings through $f_0(1710)\to PP\to \omega\phi$, $f_0(1710)\to VV\to \omega\phi$, and $f_0(1710)\to SS\to \omega\phi$. We find that intermediate meson rescatterings can produce some enhancement near the $\omega\phi$ threshold. Implications about the property of this enhancement are discussed. |
1701.02906 | Anthony Hartin | A. Hartin | Second Order QED Processes in an Intense Electromagnetic Field | The bulk of this 2006 PhD thesis comes from research performed during
1986-1994. Chapter 8 was added in 2005. Errata has been corrected in the
intervening years | British Library, EThOS uk.bl.ethos.436336 2006 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some non linear, second order QED processes in the presence of intense plane
electromagnetic waves are investigated. Analytic expressions with general
kinematics are derived for Compton scattering and $e^+e^-$ pair production in a
circularly polarised external electromagnetic field. The differential cross
sections were investigated numerically for photon energies up to 50 MeV,
external field intensity parameter $\nu^2$ to value 2, and all scattering
angles. The variation of full cross sections with respect to external field
intensity was also established. The presence of the external field led to
resonances in the Compton scattering and pair production differential cross
sections. These resonances were investigated by calculating the electron self
energy in the presence of the external field. At resonance the differential
cross sections were enhanced by several orders of magnitude. The resonances
occurred for values of external field intensity parameter $\nu^2 <1$, lowering
the limit of $\nu^2 \sim 1$ at which point non linear effects in first order
external field QED processes become important. Generally, full cross sections
increased with increasing external field intensity, though peaking sharply for
Compton scattering and levelling off for pair production. An application was
made to non linear background studies at $e^+e^-$ linear colliders. The pair
production process and electron self energy were studied for the case of a
constant crossed electromagnetic field. It was found that previous analytic
expressions required the external field to be azimuthally symmetric. New
analytic expressions for the more general non azimuthally symmetric case were
developed and a numerical parameter range equivalent to that proposed for
future linear collider designs was considered.
| [
{
"created": "Wed, 11 Jan 2017 09:52:12 GMT",
"version": "v1"
}
] | 2017-01-12 | [
[
"Hartin",
"A.",
""
]
] | Some non linear, second order QED processes in the presence of intense plane electromagnetic waves are investigated. Analytic expressions with general kinematics are derived for Compton scattering and $e^+e^-$ pair production in a circularly polarised external electromagnetic field. The differential cross sections were investigated numerically for photon energies up to 50 MeV, external field intensity parameter $\nu^2$ to value 2, and all scattering angles. The variation of full cross sections with respect to external field intensity was also established. The presence of the external field led to resonances in the Compton scattering and pair production differential cross sections. These resonances were investigated by calculating the electron self energy in the presence of the external field. At resonance the differential cross sections were enhanced by several orders of magnitude. The resonances occurred for values of external field intensity parameter $\nu^2 <1$, lowering the limit of $\nu^2 \sim 1$ at which point non linear effects in first order external field QED processes become important. Generally, full cross sections increased with increasing external field intensity, though peaking sharply for Compton scattering and levelling off for pair production. An application was made to non linear background studies at $e^+e^-$ linear colliders. The pair production process and electron self energy were studied for the case of a constant crossed electromagnetic field. It was found that previous analytic expressions required the external field to be azimuthally symmetric. New analytic expressions for the more general non azimuthally symmetric case were developed and a numerical parameter range equivalent to that proposed for future linear collider designs was considered. |
hep-ph/0505183 | Joseph Schechter | S. Masood, S. Nasri and J. Schechter | Fine structure of beta decay endpoint spectrum | 9 pages, 8 figures | Int.J.Mod.Phys. A21 (2006) 517-532 | 10.1142/S0217751X06028552 | null | hep-ph | null | We note that the fine structure at the endpoint region of the beta decay
spectrum is now essentially known using neutrino oscillation data, if the mass
of one neutrino is specified. This may help to identify the effects of nonzero
neutrino masses in future experiments. An exact treatment of phase space
kinematics is used. This work is independent of theoretical models. Additional
restrictions due to the assumption of a so-called "complementary ansatz" for
the neutrino mass matrix are also discussed.
| [
{
"created": "Fri, 20 May 2005 19:13:37 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Aug 2005 21:36:42 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Masood",
"S.",
""
],
[
"Nasri",
"S.",
""
],
[
"Schechter",
"J.",
""
]
] | We note that the fine structure at the endpoint region of the beta decay spectrum is now essentially known using neutrino oscillation data, if the mass of one neutrino is specified. This may help to identify the effects of nonzero neutrino masses in future experiments. An exact treatment of phase space kinematics is used. This work is independent of theoretical models. Additional restrictions due to the assumption of a so-called "complementary ansatz" for the neutrino mass matrix are also discussed. |
1806.03522 | Bowen Xiao | Bo-Wen Xiao and Feng Yuan | On the Threshold Resummation in Forward pA Collisions | 11 pages, 1 figure | null | 10.1016/j.physletb.2018.10.067 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, using the Higgs production in forward rapidity region in
proton-nucleus collisions as an example, we demonstrate that we can construct a
systematic formalism for the threshold resummation for forward rapidity
particle productions in the saturation formalism. The forward threshold jet
function, which satisfies the corresponding renormalization group equation, is
introduced into the new factorization formula. This calculation can be easily
generalized to other processes, such as single forward hadron productions at
forward rapidity region, and have important phenomenological implications.
| [
{
"created": "Sat, 9 Jun 2018 18:21:22 GMT",
"version": "v1"
}
] | 2018-11-28 | [
[
"Xiao",
"Bo-Wen",
""
],
[
"Yuan",
"Feng",
""
]
] | In this paper, using the Higgs production in forward rapidity region in proton-nucleus collisions as an example, we demonstrate that we can construct a systematic formalism for the threshold resummation for forward rapidity particle productions in the saturation formalism. The forward threshold jet function, which satisfies the corresponding renormalization group equation, is introduced into the new factorization formula. This calculation can be easily generalized to other processes, such as single forward hadron productions at forward rapidity region, and have important phenomenological implications. |
hep-ph/9902294 | Eugene Levin | E. Gotsman, E. Levin and U. Maor (Tel Aviv Un.) | The survival probability of large rapidity gaps in a three channel model | 26 pages in latex file,11 figures in eps files | Phys.Rev.D60:094011,1999 | 10.1103/PhysRevD.60.094011 | TAUP 2561 - 99 | hep-ph | null | The values and energy dependence for the survival probability $< \mid S\mid^2
>$ of large rapidity gaps (LRG) are calculated in a three channel model. This
model includes single and double diffractive production, as well as elastic
rescattering. It is shown that $< \mid S \mid^2 >$ decreases with increasing
energy, in line with recent results for LRG dijet production at the Tevatron.
This is in spite of the weak dependence on energy of the ratio $ (\sigma_{el}+
\sigma_{SD})/\sigma_{tot}$.
| [
{
"created": "Wed, 10 Feb 1999 07:49:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv Un."
],
[
"Levin",
"E.",
"",
"Tel Aviv Un."
],
[
"Maor",
"U.",
"",
"Tel Aviv Un."
]
] | The values and energy dependence for the survival probability $< \mid S\mid^2 >$ of large rapidity gaps (LRG) are calculated in a three channel model. This model includes single and double diffractive production, as well as elastic rescattering. It is shown that $< \mid S \mid^2 >$ decreases with increasing energy, in line with recent results for LRG dijet production at the Tevatron. This is in spite of the weak dependence on energy of the ratio $ (\sigma_{el}+ \sigma_{SD})/\sigma_{tot}$. |
hep-ph/9609268 | Kingman Cheung | Kingman Cheung, Wai-Yee Keung, and Tzu Chiang Yuan | Quarkonium Production At $Z^0$ and in $\Upsilon(1S)$ Decay | 10 pages and three figures embedded using epsf.tex. Talk given at the
UIC Quarkonium Workshop, Chicago IL, June 13-15 1996 | Int.J.Mod.Phys.A12:3931-3940,1997 | 10.1142/S0217751X97002085 | UTEXAS-HEP-96-13 | hep-ph | null | The conventional color-singlet model was challenged by the recent data on
quarkonium production. Discrepancies in production rates were observed at the
Tevatron, at LEP, and in fixed-target experiments. The newly advocated
color-octet mechanism provides a plausible solution to the anomalous quarkonium
production observed at the Tevatron. The color-octet mechanism should also
affect other quarkonium production channels. In this paper we will summarize
the studies of quarkonium production in $Z^0$ and $\Upsilon$ decays.
| [
{
"created": "Thu, 5 Sep 1996 17:54:39 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"Cheung",
"Kingman",
""
],
[
"Keung",
"Wai-Yee",
""
],
[
"Yuan",
"Tzu Chiang",
""
]
] | The conventional color-singlet model was challenged by the recent data on quarkonium production. Discrepancies in production rates were observed at the Tevatron, at LEP, and in fixed-target experiments. The newly advocated color-octet mechanism provides a plausible solution to the anomalous quarkonium production observed at the Tevatron. The color-octet mechanism should also affect other quarkonium production channels. In this paper we will summarize the studies of quarkonium production in $Z^0$ and $\Upsilon$ decays. |
1212.5709 | Wei Chao | Wei Chao, Michael J. Ramsey-Musolf | Hidden from View: Neutrino Masses, Dark Matter and TeV-Scale
Leptogenesis in a Neutrinophilic 2HDM | 23 pages, 5 figures. Minor corrections, reference updated | Phys. Rev. D 89, 033007 (2014) | 10.1103/PhysRevD.89.033007 | NPAC-12-21 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a simple extension of the Standard Model providing dark matter
and a TeV-scale seesaw mechanism that also allows for viable leptogenesis. In
addition to the Standard Model degrees of freedom, the model contains a
neutrinophilic Higgs doublet, a scalar singlet, and six singlet fermions
(including three right-handed Majorana neutrinos) that are charged under a
local $U(1)^\prime$ gauge symmetry. We show how the $U(1)^\prime$ charge
assignments and the choice of scalar potential can lead to a TeV-scale seesaw
mechanism and $\mathcal{O}(1)$ neutrino Yukawa couplings in a straightforward
way. While this scenario has all the ingredients one would expect for
significant experimental signatures, including several new TeV scale degrees of
freedom, we find that most distinctive features associated with neutrino mass
generation, leptogenesis and the dark sector are likely to remain inaccessible
in the absence of additional lepton flavor symmetries.
| [
{
"created": "Sat, 22 Dec 2012 17:35:11 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2013 00:02:11 GMT",
"version": "v2"
}
] | 2014-02-19 | [
[
"Chao",
"Wei",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
]
] | We consider a simple extension of the Standard Model providing dark matter and a TeV-scale seesaw mechanism that also allows for viable leptogenesis. In addition to the Standard Model degrees of freedom, the model contains a neutrinophilic Higgs doublet, a scalar singlet, and six singlet fermions (including three right-handed Majorana neutrinos) that are charged under a local $U(1)^\prime$ gauge symmetry. We show how the $U(1)^\prime$ charge assignments and the choice of scalar potential can lead to a TeV-scale seesaw mechanism and $\mathcal{O}(1)$ neutrino Yukawa couplings in a straightforward way. While this scenario has all the ingredients one would expect for significant experimental signatures, including several new TeV scale degrees of freedom, we find that most distinctive features associated with neutrino mass generation, leptogenesis and the dark sector are likely to remain inaccessible in the absence of additional lepton flavor symmetries. |
1409.2372 | Sacha Davidson | Assia Bessaa and Sacha Davidson | Estimated constraints on t-channel Leptoquark exchange from LHC contact
interaction searches | 8 pages,3 figures | null | 10.1140/epjc/s10052-015-3313-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The t-channel exchange of a first generation leptoquark could contribute to
the cross-section for q q-bar to e+e-. The leptoquark is off-shell, so this
process can be sensitive to leptoquarks beyond the mass reach of pair
production searches at the LHC (currently m_{LQ}> 830 GeV). We attempt to
analytically translate ATLAS bounds on $ (\bar{q} \gamma ^\mu q) (\bar{e}
\gamma _\mu e) $ contact interactions to the various scalar leptoquarks, and
obtain a bound on their quark-lepton coupling of order $\lambda^2 \leq
(m_{LQ}/2$ TeV)$^2$. The greatest difficulty in this translation is that the
leptoquarks do not induce the contact interaction studied by ATLAS, so the
interference with the Standard Model is different. If bounds were quoted on the
functional dependance of the cross-section on s-hat, rather than on particular
contact interaction models, this difficulty in applying experimental bounds to
theoretical models could be circumvented.
| [
{
"created": "Mon, 8 Sep 2014 14:40:53 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bessaa",
"Assia",
""
],
[
"Davidson",
"Sacha",
""
]
] | The t-channel exchange of a first generation leptoquark could contribute to the cross-section for q q-bar to e+e-. The leptoquark is off-shell, so this process can be sensitive to leptoquarks beyond the mass reach of pair production searches at the LHC (currently m_{LQ}> 830 GeV). We attempt to analytically translate ATLAS bounds on $ (\bar{q} \gamma ^\mu q) (\bar{e} \gamma _\mu e) $ contact interactions to the various scalar leptoquarks, and obtain a bound on their quark-lepton coupling of order $\lambda^2 \leq (m_{LQ}/2$ TeV)$^2$. The greatest difficulty in this translation is that the leptoquarks do not induce the contact interaction studied by ATLAS, so the interference with the Standard Model is different. If bounds were quoted on the functional dependance of the cross-section on s-hat, rather than on particular contact interaction models, this difficulty in applying experimental bounds to theoretical models could be circumvented. |
1202.0283 | Hai-Bo Yu | Sean Tulin, Hai-Bo Yu, and Kathryn M. Zurek | Oscillating Asymmetric Dark Matter | 23 pages, 4 figures, A typo fixed, References added | null | 10.1088/1475-7516/2012/05/013 | MCTP-12-03 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of dark matter (DM) particle-antiparticle oscillations
within the context of asymmetric DM. Oscillations arise due to small DM
number-violating Majorana-type mass terms, and can lead to recoupling of
annihilation after freeze-out and washout of the DM density. We derive the
density matrix equations for DM oscillations and freeze-out from first
principles using nonequilibrium field theory, and our results are qualitatively
different than in previous studies. DM dynamics exhibits
particle-vs-antiparticle "flavor" effects, depending on the interaction type,
analogous to neutrino oscillations in a medium. "Flavor-sensitive" DM
interactions include scattering or annihilation through a new vector boson,
while "flavor-blind" interactions include scattering or s-channel annihilation
through a new scalar boson, or annihilation to pairs of bosons. In particular,
we find that flavor-sensitive annihilation does not recouple when coherent
oscillations begin, and that flavor-blind scattering does not lead to
decoherence.
| [
{
"created": "Wed, 1 Feb 2012 21:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Feb 2012 17:09:24 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Tulin",
"Sean",
""
],
[
"Yu",
"Hai-Bo",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | We study the dynamics of dark matter (DM) particle-antiparticle oscillations within the context of asymmetric DM. Oscillations arise due to small DM number-violating Majorana-type mass terms, and can lead to recoupling of annihilation after freeze-out and washout of the DM density. We derive the density matrix equations for DM oscillations and freeze-out from first principles using nonequilibrium field theory, and our results are qualitatively different than in previous studies. DM dynamics exhibits particle-vs-antiparticle "flavor" effects, depending on the interaction type, analogous to neutrino oscillations in a medium. "Flavor-sensitive" DM interactions include scattering or annihilation through a new vector boson, while "flavor-blind" interactions include scattering or s-channel annihilation through a new scalar boson, or annihilation to pairs of bosons. In particular, we find that flavor-sensitive annihilation does not recouple when coherent oscillations begin, and that flavor-blind scattering does not lead to decoherence. |
1011.1664 | Roberto Auzzi | Roberto Auzzi and Amit Giveon | Superpartner spectrum of minimal gaugino-gauge mediation | 8 pages, 3 figures; V2: refs and a few comments added; V3 title
changed | JHEP 1101:003,2011 | 10.1007/JHEP01(2011)003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the sparticle mass spectrum in the minimal four-dimensional
construction that interpolates between gaugino and ordinary gauge mediation at
the weak scale. We find that even in the hybrid case -- when the messenger
scale is comparable to the mass of the additional gauge particles -- both the
right-handed as well as the left-handed sleptons are lighter than the bino in
the low-scale mediation regime. This implies a chain of lepton production and,
consequently, striking signatures that may be probed at the LHC already in the
near future.
| [
{
"created": "Sun, 7 Nov 2010 17:56:10 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Nov 2010 16:04:27 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Dec 2010 13:37:24 GMT",
"version": "v3"
}
] | 2011-01-27 | [
[
"Auzzi",
"Roberto",
""
],
[
"Giveon",
"Amit",
""
]
] | We evaluate the sparticle mass spectrum in the minimal four-dimensional construction that interpolates between gaugino and ordinary gauge mediation at the weak scale. We find that even in the hybrid case -- when the messenger scale is comparable to the mass of the additional gauge particles -- both the right-handed as well as the left-handed sleptons are lighter than the bino in the low-scale mediation regime. This implies a chain of lepton production and, consequently, striking signatures that may be probed at the LHC already in the near future. |
1912.09616 | Bin Yang | Bin Yang, Bo Wang, Lu Meng, Shi-Lin Zhu | Isospin violating decay $D^*_s \to D_s \pi^0$ in chiral perturbation
theory | 8 pages,5 figures | Phys. Rev. D 101, 054019 (2020) | 10.1103/PhysRevD.101.054019 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We systematically calculate the isospin violating decay, $D_s^*\to D_s\pi^0$,
with the heavy meson chiral perturbation theory up to $\mathcal{O}(p^3)$
including the loop diagrams. The $\mathcal{O}(p^3)$ tree level amplitudes
contain four undetermined LECs. We use two strategies to estimate them. With
the nonanalytic dominance approximation, we get $\Gamma[D_s^\ast\to
D_s\pi^0]=(3.38\pm0.12)$ eV. With the naturalness assumption, we give a
possible range of the isospin violating decay width, $[1.11-6.88]$ eV. We find
that the contribution of the $\mathcal{O}(p^3)$ corrections might be
significant.
| [
{
"created": "Fri, 20 Dec 2019 02:29:43 GMT",
"version": "v1"
}
] | 2020-03-25 | [
[
"Yang",
"Bin",
""
],
[
"Wang",
"Bo",
""
],
[
"Meng",
"Lu",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We systematically calculate the isospin violating decay, $D_s^*\to D_s\pi^0$, with the heavy meson chiral perturbation theory up to $\mathcal{O}(p^3)$ including the loop diagrams. The $\mathcal{O}(p^3)$ tree level amplitudes contain four undetermined LECs. We use two strategies to estimate them. With the nonanalytic dominance approximation, we get $\Gamma[D_s^\ast\to D_s\pi^0]=(3.38\pm0.12)$ eV. With the naturalness assumption, we give a possible range of the isospin violating decay width, $[1.11-6.88]$ eV. We find that the contribution of the $\mathcal{O}(p^3)$ corrections might be significant. |
hep-ph/9907501 | Guest Anyone | U. Aglietti (Rome1) and G. Ricciardi (Rome1) | Matching of the Shape Function | 11 pages, 1 figure added, minor changes in the text | Phys.Lett.B466:313,1999 | 10.1016/S0370-2693(99)01103-X | preprint Roma1-1257-99 | hep-ph | null | The shape function f(k_+) describes Fermi motion effects in inclusive
semi-leptonic decays such as B -> X_u+e+nu near the end-point of the lepton
spectrum. We compute the leading one-loop corrections to the shape function
f(k_+) in the effective theory with a hard cut-off regularization. The matching
constant onto full QCD is infrared safe, i.e. the leading infrared singularity
represented by the term log^2(k_+) cancels in the difference of integrals. We
compare the hard cut-off result with the result in dimensional regularization,
the latter containing an additional factor of two in the coefficient of the
log^2(k_+) term, and consequently requiring an oversubtraction.
| [
{
"created": "Mon, 26 Jul 1999 18:02:44 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jul 1999 19:55:20 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Sep 1999 16:10:53 GMT",
"version": "v3"
}
] | 2011-02-01 | [
[
"Aglietti",
"U.",
"",
"Rome1"
],
[
"Ricciardi",
"G.",
"",
"Rome1"
]
] | The shape function f(k_+) describes Fermi motion effects in inclusive semi-leptonic decays such as B -> X_u+e+nu near the end-point of the lepton spectrum. We compute the leading one-loop corrections to the shape function f(k_+) in the effective theory with a hard cut-off regularization. The matching constant onto full QCD is infrared safe, i.e. the leading infrared singularity represented by the term log^2(k_+) cancels in the difference of integrals. We compare the hard cut-off result with the result in dimensional regularization, the latter containing an additional factor of two in the coefficient of the log^2(k_+) term, and consequently requiring an oversubtraction. |
2211.08359 | Alessandro Strumia | Alessandro Strumia | Dark Matter from freeze-in and its inhomogeneities | 8 pages. Published on JHEP | null | 10.1007/JHEP03(2023)042 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We consider generic freeze-in processes for generation of Dark Matter,
together with the consequent re-thermalization of the Standard Model fluid. We
find that Dark Matter inherits the Standard Model adiabatic inhomogeneities on
the cosmological scales probed by current observations, that were super-horizon
during freeze-in. Thereby, freeze-in satisfies the bounds on iso-curvature
perturbations.
| [
{
"created": "Tue, 15 Nov 2022 18:07:01 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2024 10:48:12 GMT",
"version": "v2"
}
] | 2024-01-19 | [
[
"Strumia",
"Alessandro",
""
]
] | We consider generic freeze-in processes for generation of Dark Matter, together with the consequent re-thermalization of the Standard Model fluid. We find that Dark Matter inherits the Standard Model adiabatic inhomogeneities on the cosmological scales probed by current observations, that were super-horizon during freeze-in. Thereby, freeze-in satisfies the bounds on iso-curvature perturbations. |
hep-ph/9409285 | null | K.S. Babu and S.M. Barr | Supersymmetric SO(10) Simplified | 23 pages, BA-94-45 | Phys.Rev.D51:2463-2470,1995 | 10.1103/PhysRevD.51.2463 | null | hep-ph | null | In the context of supersymmetric $SO(10)$ grand unified models, it is shown
that the gauge symmetry breaking as well as a natural doublet--triplet
splitting can be achieved with a minimal Higgs system consisting of a single
adjoint and a pair of vector and spinor multiplets. Such a Higgs spectrum has
been shown to arise in the free fermionic formulation of superstrings. Since
the symmetry breaking mechanism relies on non--renormalizable operators, some
of the Higgs particles of the model turn out to have masses somewhat below the
GUT scale. As a consequence, the unification scale is raised to about $2 \times
10^{17}~GeV$ and sin$^2\theta_W$ is predicted to be slightly larger than the
minimal SUSY--$SU(5)$ value. Including threshold uncertainties, which turn out
to be surprisingly small in the model, we show that sin$^2\theta_W$ prediction
is consistent with experiments.
| [
{
"created": "Mon, 12 Sep 1994 20:36:12 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Babu",
"K. S.",
""
],
[
"Barr",
"S. M.",
""
]
] | In the context of supersymmetric $SO(10)$ grand unified models, it is shown that the gauge symmetry breaking as well as a natural doublet--triplet splitting can be achieved with a minimal Higgs system consisting of a single adjoint and a pair of vector and spinor multiplets. Such a Higgs spectrum has been shown to arise in the free fermionic formulation of superstrings. Since the symmetry breaking mechanism relies on non--renormalizable operators, some of the Higgs particles of the model turn out to have masses somewhat below the GUT scale. As a consequence, the unification scale is raised to about $2 \times 10^{17}~GeV$ and sin$^2\theta_W$ is predicted to be slightly larger than the minimal SUSY--$SU(5)$ value. Including threshold uncertainties, which turn out to be surprisingly small in the model, we show that sin$^2\theta_W$ prediction is consistent with experiments. |
1408.3013 | Antonio Morais | D. J. Miller, A. P. Morais | Supersymmetric SO(10) Grand Unification at the LHC and Beyond | Published version | JHEP 1412 (2014) 132 | 10.1007/JHEP12(2014)132 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study models of supersymmetric grand unification based on the SO(10) gauge
group. We investigate scenarios of non-universal gaugino masses including
models containing a mixture of two representations of hidden sector chiral
superfields. We analyse the effect of excluding mu from the fine-tuning
measure, and confront the results with low energy constraints, including the
Higgs boson mass, dark matter relic density and supersymmetry bounds. We also
determine high scale Yukawa coupling ratios and confront the results with
theoretical predictions. Finally, we present two additional benchmarks that
should be explored at the LHC and future colliders.
| [
{
"created": "Wed, 13 Aug 2014 14:19:06 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2014 16:41:16 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Dec 2014 13:49:40 GMT",
"version": "v3"
}
] | 2014-12-30 | [
[
"Miller",
"D. J.",
""
],
[
"Morais",
"A. P.",
""
]
] | We study models of supersymmetric grand unification based on the SO(10) gauge group. We investigate scenarios of non-universal gaugino masses including models containing a mixture of two representations of hidden sector chiral superfields. We analyse the effect of excluding mu from the fine-tuning measure, and confront the results with low energy constraints, including the Higgs boson mass, dark matter relic density and supersymmetry bounds. We also determine high scale Yukawa coupling ratios and confront the results with theoretical predictions. Finally, we present two additional benchmarks that should be explored at the LHC and future colliders. |
hep-ph/9712217 | Jose Luis Cortes | Jos\'e Luis Cort\'es, Jorge Gamboa and Luis Vel\'azquez | A Nambu-Jona-Lasinio like model from QCD at low energies | 7 pages, Latex file, no figures, revised version to appear in Phys.
Lett. B | Phys.Lett. B432 (1998) 397-401 | 10.1016/S0370-2693(98)00694-7 | DFTUZ 97/26, USACH 97/11 | hep-ph hep-th | null | A generalization to any dimension of the fermion field transformation which
allows to derive the solution of the massless Schwinger model in the path
integral framework is identified. New arguments based on this transformation
for a Nambu-Jona-Lasinio (NJL) like model as the low energy limit of a gauge
theory in dimension greater than two are presented. Our result supports the
spontaneous chiral symmetry breaking picture conjectured by Nambu many years
ago and the link between QCD, NJL and chiral models.
| [
{
"created": "Mon, 1 Dec 1997 16:37:21 GMT",
"version": "v1"
},
{
"created": "Thu, 28 May 1998 09:34:15 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Cortés",
"José Luis",
""
],
[
"Gamboa",
"Jorge",
""
],
[
"Velázquez",
"Luis",
""
]
] | A generalization to any dimension of the fermion field transformation which allows to derive the solution of the massless Schwinger model in the path integral framework is identified. New arguments based on this transformation for a Nambu-Jona-Lasinio (NJL) like model as the low energy limit of a gauge theory in dimension greater than two are presented. Our result supports the spontaneous chiral symmetry breaking picture conjectured by Nambu many years ago and the link between QCD, NJL and chiral models. |
1011.3372 | Wolfgang Lucha | Wolfgang Lucha, Dmitri Melikhov, Silvano Simula | Heavy-Quark Mass and Heavy-Meson Decay Constants from QCD Sum Rules | talk presented at "Quark Confinement and the Hadron Spectrum IX -
QCHS IX" (30 August - 3 September 2010, Madrid, Spain), to appear in the
proceedings; version 2: minor, purely cosmetic changes, 1 reference added | AIP Conf.Proc.1343:379-381,2011 | 10.1063/1.3575035 | HEPHY-PUB 892/10 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a sum-rule extraction of heavy-meson decay constants from the
two-point correlator of heavy-light pseudoscalar currents. Our main concern is
to control the uncertainties of the decay constants, induced by both input QCD
parameters and limited accuracy of the sum-rule method. Gaining this control is
possible by applying our novel procedure for the extraction of hadron
observables utilizing Borel-parameter-depending dual thresholds. For the
charmed mesons, we obtain f_D = 206.2 \pm 7.3 (OPE) \pm 5.1 (syst) MeV and
f_{D_s} = 245.3 \pm 15.7 (OPE) \pm 4.5 (syst) MeV. For the beauty mesons, the
decay constants prove to be extremely sensitive to the exact value of the
b-quark MS-bar mass m_b(m_b). Matching our sum-rule prediction for f_B to the
lattice findings, the very accurate b-mass value m_b(m_b) = 4.245 \pm 0.025 GeV
is found, which yields f_B = 193.4 \pm 12.3 (OPE) \pm 4.3 (syst) MeV and
f_{B_s} = 232.5 \pm 18.6 (OPE) \pm 2.4 (syst) MeV.
| [
{
"created": "Mon, 15 Nov 2010 13:14:37 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Dec 2010 16:56:11 GMT",
"version": "v2"
}
] | 2011-06-15 | [
[
"Lucha",
"Wolfgang",
""
],
[
"Melikhov",
"Dmitri",
""
],
[
"Simula",
"Silvano",
""
]
] | We present a sum-rule extraction of heavy-meson decay constants from the two-point correlator of heavy-light pseudoscalar currents. Our main concern is to control the uncertainties of the decay constants, induced by both input QCD parameters and limited accuracy of the sum-rule method. Gaining this control is possible by applying our novel procedure for the extraction of hadron observables utilizing Borel-parameter-depending dual thresholds. For the charmed mesons, we obtain f_D = 206.2 \pm 7.3 (OPE) \pm 5.1 (syst) MeV and f_{D_s} = 245.3 \pm 15.7 (OPE) \pm 4.5 (syst) MeV. For the beauty mesons, the decay constants prove to be extremely sensitive to the exact value of the b-quark MS-bar mass m_b(m_b). Matching our sum-rule prediction for f_B to the lattice findings, the very accurate b-mass value m_b(m_b) = 4.245 \pm 0.025 GeV is found, which yields f_B = 193.4 \pm 12.3 (OPE) \pm 4.3 (syst) MeV and f_{B_s} = 232.5 \pm 18.6 (OPE) \pm 2.4 (syst) MeV. |
0803.1989 | Ruth Britto | Ruth Britto, Bo Feng, Pierpaolo Mastrolia | Closed-Form Decomposition of One-Loop Massive Amplitudes | 37 pages | Phys.Rev.D78:025031,2008 | 10.1103/PhysRevD.78.025031 | CERN-PH-TH/2008-050 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present formulas for the coefficients of 2-, 3-, 4- and 5-point master
integrals for one-loop massive amplitudes. The coefficients are derived from
unitarity cuts in D dimensions. The input parameters can be read off from any
unitarity-cut integrand, as assembled from tree-level expressions, after simple
algebraic manipulations. The formulas presented here are suitable for
analytical as well as numerical evaluation. Their validity is confirmed in two
known cases of helicity amplitudes contributing to gg -> gg and gg -> gH, where
the masses of the Higgs and the fermion circulating in the loop are kept as
free parameters.
| [
{
"created": "Thu, 13 Mar 2008 15:18:53 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Britto",
"Ruth",
""
],
[
"Feng",
"Bo",
""
],
[
"Mastrolia",
"Pierpaolo",
""
]
] | We present formulas for the coefficients of 2-, 3-, 4- and 5-point master integrals for one-loop massive amplitudes. The coefficients are derived from unitarity cuts in D dimensions. The input parameters can be read off from any unitarity-cut integrand, as assembled from tree-level expressions, after simple algebraic manipulations. The formulas presented here are suitable for analytical as well as numerical evaluation. Their validity is confirmed in two known cases of helicity amplitudes contributing to gg -> gg and gg -> gH, where the masses of the Higgs and the fermion circulating in the loop are kept as free parameters. |
hep-ph/0603219 | Katsuji Yamamoto | Katsuichi Higuchi, Masato Senami, and Katsuji Yamamoto | Universality of strength for Yukawa couplings with extra down-type quark
singlets | Only the title is shortened, accepted for Phys. Lett. B, 10 pages, 1.
figure | Phys.Lett. B638 (2006) 492-496 | 10.1016/j.physletb.2006.06.002 | null | hep-ph | null | We investigate the quark masses and mixings by including vector-like
down-type quark singlets in universality of strength for Yukawa couplings
(USY). In contrast with the standard model with USY, the sufficient $ CP $
violation is obtained for the Cabibbo-Kobayashi-Maskawa matrix through the
mixing between the ordinary quarks and quark singlets. The top-bottom mass
hierarchy $ m_t \gg m_b $ also appears naturally in the USY scheme with the
down-type quark singlets.
| [
{
"created": "Mon, 27 Mar 2006 03:09:10 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jun 2006 03:07:08 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Higuchi",
"Katsuichi",
""
],
[
"Senami",
"Masato",
""
],
[
"Yamamoto",
"Katsuji",
""
]
] | We investigate the quark masses and mixings by including vector-like down-type quark singlets in universality of strength for Yukawa couplings (USY). In contrast with the standard model with USY, the sufficient $ CP $ violation is obtained for the Cabibbo-Kobayashi-Maskawa matrix through the mixing between the ordinary quarks and quark singlets. The top-bottom mass hierarchy $ m_t \gg m_b $ also appears naturally in the USY scheme with the down-type quark singlets. |
hep-ph/0301019 | Mustafa Savci | T. M. Aliev, A. Ozpineci, M. Savci | Explicit expressions of the 'Lambda' baryon polarizations in (Lambda_b
-> Lambda l^+ l^-) decay for the massive lepton case | 2 pages, LaTeX formatted | null | null | metu-phys-hep-02-36 | hep-ph | null | We present the explicit form of the expressions of the 'Lambda' baryon
polarizations in (Lambda_b -> Lambda l^+ l^-) decay for the massive lepton case
as a complementary to our previous work prep: hep--ph/0211447.
| [
{
"created": "Sun, 5 Jan 2003 14:58:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aliev",
"T. M.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Savci",
"M.",
""
]
] | We present the explicit form of the expressions of the 'Lambda' baryon polarizations in (Lambda_b -> Lambda l^+ l^-) decay for the massive lepton case as a complementary to our previous work prep: hep--ph/0211447. |
1509.03848 | Ning Chen | Ning Chen, Jinmian Li, Yandong Liu | LHC searches for heavy neutral Higgs bosons with a top jet substructure
analysis | 21 pages, 5 figures; v2: matches the published version | Phys. Rev. D 93, 095013 (2016) | 10.1103/PhysRevD.93.095013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the LHC searches for the heavy $CP$-odd Higgs boson $A$ and
$CP$-even Higgs boson $H$ in the context of general two-Higgs-doublet model.
Specifically, we consider the decay mode of $A/H\to t \bar t $ through the $b
\bar b$ or $t \bar t $ associated production channels. In the so-called
"alignment limit" of the two-Higgs-doublet model, this decay mode can be the
most dominant one. By employing the HEPTopTagger and the
multi-variable-analysis method, we present the search sensitivities for both
$CP$-odd Higgs boson $A$ and $CP$-even Higgs boson $H$ via these channels at
the high-luminosity LHC runs.
| [
{
"created": "Sun, 13 Sep 2015 13:54:50 GMT",
"version": "v1"
},
{
"created": "Sun, 15 May 2016 15:41:28 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Chen",
"Ning",
""
],
[
"Li",
"Jinmian",
""
],
[
"Liu",
"Yandong",
""
]
] | We study the LHC searches for the heavy $CP$-odd Higgs boson $A$ and $CP$-even Higgs boson $H$ in the context of general two-Higgs-doublet model. Specifically, we consider the decay mode of $A/H\to t \bar t $ through the $b \bar b$ or $t \bar t $ associated production channels. In the so-called "alignment limit" of the two-Higgs-doublet model, this decay mode can be the most dominant one. By employing the HEPTopTagger and the multi-variable-analysis method, we present the search sensitivities for both $CP$-odd Higgs boson $A$ and $CP$-even Higgs boson $H$ via these channels at the high-luminosity LHC runs. |
hep-ph/9406307 | Owe Philipsen | O.Philipsen | On the problem of the magnetic mass | 4pp., 2figs, uuencoded ps-file; Contribution to the NATO Advanced
Research workshop 'Electroweak Physics and the Early Universe', 23-25 March
1994, Sintra, Portugal | null | null | null | hep-ph | null | The dynamical generation of a transverse gauge field mass is studied by means
of gap equations for pure gauge theory and the gauged non-linear sigma model in
three dimensions. Non-trivial solutions to the gap equations are found
indicating that this type of mass generation is a feature of the static sector
of finite temperature field theory. In the case of the non-linear sigma model
the transverse mass can be defined in a manifestly gauge invariant manner. Its
value is determined to be m=0.28g^2.
| [
{
"created": "Tue, 14 Jun 1994 15:57:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Philipsen",
"O.",
""
]
] | The dynamical generation of a transverse gauge field mass is studied by means of gap equations for pure gauge theory and the gauged non-linear sigma model in three dimensions. Non-trivial solutions to the gap equations are found indicating that this type of mass generation is a feature of the static sector of finite temperature field theory. In the case of the non-linear sigma model the transverse mass can be defined in a manifestly gauge invariant manner. Its value is determined to be m=0.28g^2. |
hep-ph/0103240 | Ian G. Moss | Ian G Moss, Noriko Shiiki and Takashi Torii | Vacuum energy of CP(1) solitons | 16 pages, 6 figures | null | null | null | hep-ph | null | The vacuum energy of two CP(1) solitons on a torus is computed numerically. A
numerical technique for zeta-function regularisation is proposed to remove the
divergences of the vacuum energy. After performing the numerical
regularisation, we observe the effect of the vacuum energy on the two soliton
interactions.
| [
{
"created": "Thu, 22 Mar 2001 14:07:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moss",
"Ian G",
""
],
[
"Shiiki",
"Noriko",
""
],
[
"Torii",
"Takashi",
""
]
] | The vacuum energy of two CP(1) solitons on a torus is computed numerically. A numerical technique for zeta-function regularisation is proposed to remove the divergences of the vacuum energy. After performing the numerical regularisation, we observe the effect of the vacuum energy on the two soliton interactions. |
2307.06321 | Henri H\"anninen | G. Beuf, H. H\"anninen, T. Lappi, H. M\"antysaari, Y. Mulian | Diffractive Deep Inelastic Scattering in the Dipole Picture at
Next-to-Leading Order | DIS2023, talk by HH; 5 pages, 3 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the contribution from the $q \bar q g$ state production to the
diffractive cross sections in deep inelastic scattering at high energy. The
obtained cross section is finite by itself, and consists a part of the full
next-to-leading order result for the diffractive structure functions. Our
calculation for the diffractive structure functions is performed using exact
kinematics, under the shockwave approximation of the scattering process. Once
the calculation is completed, we show that the previously known behaviour at
the high-$Q^2$ and large-$M_X^2$ regime can be extracted from our results by
taking the appropriate limits. Furthermore, we discuss the steps required to
obtain the complete next-to-leading order results for the structure functions
in the color glass condensate (CGC) formalism, and the application of these
results to phenomenology.
| [
{
"created": "Wed, 12 Jul 2023 17:33:16 GMT",
"version": "v1"
}
] | 2023-07-13 | [
[
"Beuf",
"G.",
""
],
[
"Hänninen",
"H.",
""
],
[
"Lappi",
"T.",
""
],
[
"Mäntysaari",
"H.",
""
],
[
"Mulian",
"Y.",
""
]
] | We calculate the contribution from the $q \bar q g$ state production to the diffractive cross sections in deep inelastic scattering at high energy. The obtained cross section is finite by itself, and consists a part of the full next-to-leading order result for the diffractive structure functions. Our calculation for the diffractive structure functions is performed using exact kinematics, under the shockwave approximation of the scattering process. Once the calculation is completed, we show that the previously known behaviour at the high-$Q^2$ and large-$M_X^2$ regime can be extracted from our results by taking the appropriate limits. Furthermore, we discuss the steps required to obtain the complete next-to-leading order results for the structure functions in the color glass condensate (CGC) formalism, and the application of these results to phenomenology. |
1104.2192 | Marina Nielsen | R.M. Albuquerque and M. Nielsen | Erratum: QCD sum rules study of the $J^{PC}=1^{--}$ charmonium $Y$
mesons | 1 page | Nucl.Phys.A815:53-66,2009; Erratum-ibid.A857:48-49,2011 | 10.1016/j.nuclphysa.2008.10.015 10.1016/j.nuclphysa.2011.04.001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We correct a mistake in the analytical expression given in
Nucl. Phys. {\bf A} 815, 53 (2009) [arXiv:0804.4817] for the
$D_{s0}\bar{D}_s^*$ and $D_{0}\bar{D}^*$ molecular currents. As a consequence,
the mass obtained for the $D_{0}\bar{D}^*$ molecular current:
$m_{D_{0}\bar{D}^*}=(4.96\pm 0.11)$ GeV is no longer compatible with the
experimental mass of the meson Y(4260).
| [
{
"created": "Tue, 12 Apr 2011 12:38:27 GMT",
"version": "v1"
}
] | 2011-04-28 | [
[
"Albuquerque",
"R. M.",
""
],
[
"Nielsen",
"M.",
""
]
] | We correct a mistake in the analytical expression given in Nucl. Phys. {\bf A} 815, 53 (2009) [arXiv:0804.4817] for the $D_{s0}\bar{D}_s^*$ and $D_{0}\bar{D}^*$ molecular currents. As a consequence, the mass obtained for the $D_{0}\bar{D}^*$ molecular current: $m_{D_{0}\bar{D}^*}=(4.96\pm 0.11)$ GeV is no longer compatible with the experimental mass of the meson Y(4260). |
1804.02519 | Kazem Azizi | S. S. Agaev, K. Azizi, H. Sundu | The nonet of the light scalar tetraquarks: the mesons $a_0(980)$ and
$K_{0}^{\ast }(800)$ | 10 Pages and 4 Figures | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spectroscopic parameters and partial decay widths of the light mesons $
a_0(980) $ and $K_{0}^{\ast}(800)$ are calculated by treating them as scalar
diquark-antidiquark states. The masses and couplings of the mesons are found in
the framework of QCD two-point sum rule approach. The widths of the decay
channels $a_0(980) \to \eta \pi$ and $a_0(980) \to K \bar{K}$, and $
K_{0}^{\ast}(800) \to K^{+} \pi^{-}$ and $K_{0}^{\ast}(800) \to K^{0} \pi^{0} $
are evaluated using QCD sum rules on the light-cone and technical tools of the
soft meson approximation. Our results for the mass of the mesons
$m_{a_0}=991^{+29}_{-27} \ \mathrm{MeV}$ and $m_{K^{ \ast}}=767^{+38}_{-29} \
\mathrm{MeV}$, as well as their total width $\Gamma _{\mathrm{a_0}}=62.01\pm
14.37\ \mathrm{MeV}$ and $\Gamma _{\mathrm{ K_0^{\ast}}}=401.1\pm 87.1\
\mathrm{MeV}$ are compared with last experimental data.
| [
{
"created": "Sat, 7 Apr 2018 07:22:44 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2018 08:03:04 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Jan 2019 07:42:11 GMT",
"version": "v3"
}
] | 2019-01-07 | [
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] | The spectroscopic parameters and partial decay widths of the light mesons $ a_0(980) $ and $K_{0}^{\ast}(800)$ are calculated by treating them as scalar diquark-antidiquark states. The masses and couplings of the mesons are found in the framework of QCD two-point sum rule approach. The widths of the decay channels $a_0(980) \to \eta \pi$ and $a_0(980) \to K \bar{K}$, and $ K_{0}^{\ast}(800) \to K^{+} \pi^{-}$ and $K_{0}^{\ast}(800) \to K^{0} \pi^{0} $ are evaluated using QCD sum rules on the light-cone and technical tools of the soft meson approximation. Our results for the mass of the mesons $m_{a_0}=991^{+29}_{-27} \ \mathrm{MeV}$ and $m_{K^{ \ast}}=767^{+38}_{-29} \ \mathrm{MeV}$, as well as their total width $\Gamma _{\mathrm{a_0}}=62.01\pm 14.37\ \mathrm{MeV}$ and $\Gamma _{\mathrm{ K_0^{\ast}}}=401.1\pm 87.1\ \mathrm{MeV}$ are compared with last experimental data. |
hep-ph/9403305 | null | R. Casalbuoni, P. Chiappetta, A. Deandrea, S. De Curtis, D. Dominici
and R. Gatto | Pseudo Goldstones at Future Colliders from the Extended Bess Model | 17 pages and 12 figures (included as a uuencoded tar file), LaTeX
(style article), UGVA-DPT 1994/03-845 | Z.Phys. C65 (1995) 327-336 | 10.1007/BF01571890 | null | hep-ph | null | We consider the production of the lightest pseudo-Goldstone bosons at future
colliders through the vector resonances predicted by the extended BESS model,
which consists of an effective lagrangian parametrization with dynamical
symmetry breaking, describing scalar, vector and axial-vector bound states in a
rather general framework. We find that the detection of pseudo-Goldstone pairs
at LHC requires a careful evaluation of backgrounds. For e+e- collisions in the
TeV range the backgrounds can be easily reduced and the detection of
pseudo-Goldstone pairs is generally easier.
| [
{
"created": "Thu, 17 Mar 1994 19:45:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Casalbuoni",
"R.",
""
],
[
"Chiappetta",
"P.",
""
],
[
"Deandrea",
"A.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Dominici",
"D.",
""
],
[
"Gatto",
"R.",
""
]
] | We consider the production of the lightest pseudo-Goldstone bosons at future colliders through the vector resonances predicted by the extended BESS model, which consists of an effective lagrangian parametrization with dynamical symmetry breaking, describing scalar, vector and axial-vector bound states in a rather general framework. We find that the detection of pseudo-Goldstone pairs at LHC requires a careful evaluation of backgrounds. For e+e- collisions in the TeV range the backgrounds can be easily reduced and the detection of pseudo-Goldstone pairs is generally easier. |
2206.01453 | Liaofu Luo | Liaofu Luo and Jun Lv | Application of Generalized Quaternion in Physics | 21 pages | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The applications of quaternion in physics are discussed with an emphasis on
elementary particle symmetry and interaction. Three colours of the quark and
the quantum chromodynamics (QCD) can be introduced directly from the invariance
of basic equations under the quaternion phase transformation (quaternion gauge
invariance). The generalized quaternions obey the SU(3) symmetry. QCD is
essentially the quantum quaternion dynamics. The further generalization of
SU(3) quaternion to G2 octonion is worked out. We demonstrate that the G2
octonion contains seven tri-generator sets of SU(2) symmetry and three of them
form SU(3) subgroup. A model of the elementary particle classification and
interaction based on octonion gauge theory is proposed. The model unifies the
colour and flavour of all particles. It provides a framework for the unified
description of four kinds of elementary particles (quarks, leptons, gauge
fields and Higgs bosons) and their interactions.
| [
{
"created": "Fri, 3 Jun 2022 08:36:20 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2022 03:41:52 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Luo",
"Liaofu",
""
],
[
"Lv",
"Jun",
""
]
] | The applications of quaternion in physics are discussed with an emphasis on elementary particle symmetry and interaction. Three colours of the quark and the quantum chromodynamics (QCD) can be introduced directly from the invariance of basic equations under the quaternion phase transformation (quaternion gauge invariance). The generalized quaternions obey the SU(3) symmetry. QCD is essentially the quantum quaternion dynamics. The further generalization of SU(3) quaternion to G2 octonion is worked out. We demonstrate that the G2 octonion contains seven tri-generator sets of SU(2) symmetry and three of them form SU(3) subgroup. A model of the elementary particle classification and interaction based on octonion gauge theory is proposed. The model unifies the colour and flavour of all particles. It provides a framework for the unified description of four kinds of elementary particles (quarks, leptons, gauge fields and Higgs bosons) and their interactions. |
1805.07334 | Hiroyuki Nishiura | Yoshio Koide and Hiroyuki Nishiura | Parameter-Independent Quark Mass Relation in the U(3)$\times$U(3)$'$
Model | 12 pages, 4 figures, accepted version by MPLA | null | 10.1142/S0217732318502309 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, we have proposed a quark mass matrix model based on
U(3)$\times$U(3)$'$ family symmetry, in which up- and down-quark mass matrices
$M_u$ and $M_d$ are described only by complex parameters $a_u $ and $a_d $,
respectively. When we use charged lepton masses as additional input values, we
can successfully obtain predictions for quark masses and
Cabibbo-Kobayashi-Maskawa mixing. Since we have only one complex parameter
$a_q$ for each mass matrix $M_q$, we can obtain a parameter-independent mass
relation by using three equations for ${\rm Tr}[H_q]$, ${\rm Tr}[H_q H_q]$ and
${\rm det}H_q$, where $H_q \equiv M_q M_q^\dagger$ ($q=u, d$). In this paper,
we investigate its parameter-independent feature of the quark mass relation in
the model.
| [
{
"created": "Fri, 18 May 2018 17:30:47 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Oct 2018 12:45:16 GMT",
"version": "v2"
}
] | 2019-01-30 | [
[
"Koide",
"Yoshio",
""
],
[
"Nishiura",
"Hiroyuki",
""
]
] | Recently, we have proposed a quark mass matrix model based on U(3)$\times$U(3)$'$ family symmetry, in which up- and down-quark mass matrices $M_u$ and $M_d$ are described only by complex parameters $a_u $ and $a_d $, respectively. When we use charged lepton masses as additional input values, we can successfully obtain predictions for quark masses and Cabibbo-Kobayashi-Maskawa mixing. Since we have only one complex parameter $a_q$ for each mass matrix $M_q$, we can obtain a parameter-independent mass relation by using three equations for ${\rm Tr}[H_q]$, ${\rm Tr}[H_q H_q]$ and ${\rm det}H_q$, where $H_q \equiv M_q M_q^\dagger$ ($q=u, d$). In this paper, we investigate its parameter-independent feature of the quark mass relation in the model. |
hep-ph/0410157 | Paul Sutcliffe | Richard Battye and Paul Sutcliffe | Skyrmions and the pion mass | 17 pages, including 8 figures. Version to appear in Nucl.Phys.B | Nucl.Phys. B705 (2005) 384-400 | 10.1016/j.nuclphysb.2004.11.018 | null | hep-ph hep-th | null | We present numerical evidence that suggests the introduction of a non-zero
pion mass might dramatically affect the structure of minimal energy Skyrmions.
It appears that the shell-like Skyrmions which are the minima when the pions
are massless can fail to be minimal energy bound states for particular baryon
numbers, with a strong dependence upon the value of the pion mass. The effects
of a pion mass may include the replacement of shell-like configurations with
crystal chunks and the loss of shell-like bound states with baryon numbers five
and eight; which is in agreement with expectations based on real nuclei.
| [
{
"created": "Mon, 11 Oct 2004 23:02:45 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Nov 2004 16:27:50 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Battye",
"Richard",
""
],
[
"Sutcliffe",
"Paul",
""
]
] | We present numerical evidence that suggests the introduction of a non-zero pion mass might dramatically affect the structure of minimal energy Skyrmions. It appears that the shell-like Skyrmions which are the minima when the pions are massless can fail to be minimal energy bound states for particular baryon numbers, with a strong dependence upon the value of the pion mass. The effects of a pion mass may include the replacement of shell-like configurations with crystal chunks and the loss of shell-like bound states with baryon numbers five and eight; which is in agreement with expectations based on real nuclei. |
1010.5637 | Guido Altarelli | Guido Altarelli | Particle Physics at the LHC Start | 17 pages. From talks given at the 22nd Rencontres de Blois on
Particle Physics and Cosmology, Blois, France, July 15-20, 2010, at the
Symposium on High Energy Strong Interactions, Kyoto, Japan, August 9 -13,
2010 and at the LHC days in Split, Split, Croatia, October 4-9, 2010 | Prog.Theor.Phys.Suppl.187:305-321,2011 | 10.1143/PTPS.187.305 | RM3-TH/10-10, CERN-PH-TH/2010-249 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a concise review of the major issues and challenges in particle
physics at the start of the LHC era. After a brief overview of the Standard
Model and of QCD, I will focus on the electroweak symmetry breaking problem
which plays a central role in particle physics today. The Higgs sector of the
minimal Standard Model is so far just a mere conjecture that needs to be
verified or discarded by the LHC. Probably the reality is more complicated. I
will summarize the motivation for new physics that should accompany or even
replace the Higgs discovery and a number of its possible forms that could be
revealed by the LHC.
| [
{
"created": "Wed, 27 Oct 2010 10:17:47 GMT",
"version": "v1"
}
] | 2011-05-27 | [
[
"Altarelli",
"Guido",
""
]
] | I present a concise review of the major issues and challenges in particle physics at the start of the LHC era. After a brief overview of the Standard Model and of QCD, I will focus on the electroweak symmetry breaking problem which plays a central role in particle physics today. The Higgs sector of the minimal Standard Model is so far just a mere conjecture that needs to be verified or discarded by the LHC. Probably the reality is more complicated. I will summarize the motivation for new physics that should accompany or even replace the Higgs discovery and a number of its possible forms that could be revealed by the LHC. |
hep-ph/0102261 | V. Gogohia | V. Gogohia | A gauge invariant formulation of intrinsically nonperturbative QCD | 26 pages including one Table, some new material and clarifications
are introduced, typos corrected as well as a few new references are added | null | null | null | hep-ph | null | Using a system of the corresponding Schwinger-Dyson equations of motion, a
pure dynamical theory of quark confinement and spontaneous breakdown of chiral
symmetry is formulated. It is based on dominated in the QCD vacuum
self-interaction of massless gluons only, i.e., without involving some extra
degrees of freedom. This interaction becomes strongly singular in the deep
infrared domain leading thus to the enhancement of zero momentum modes in the
nonperturbative QCD vacuum. Using theory of distributions, complemented by the
dimensional regularization method, we have explicitly shown that strong
infrared singularities can be put under control. In this way a new phase in
QCD, intrinsically nonperturbative QCD which is manifestly gauge invariant, was
discovered. As a result, a highly nontrivial dynamical and topological
structure of the QCD vacuum has emerged within our approach. We have also
explicitly shown how infrared multiplicative renormalization program should be
done in order to self-consistently remove all the strong infrared singularities
from the theory. The corresponding convergence conditions play a crucial role
in this program. In this theory any physical observables are determined by such
correlation functions from which all types of the perturbative contributions
should be subtracted, by definition. Theory is not only infrared finite but it
is free from the ultraviolet divergences as well. It has a mass gap $\Delta >
0$, i.e., there are no physical states in the interval $(0, \Delta)$. It
explains confinement, spontaneous breakdown of chiral symmetry and other
nonperturbative effects on a general ground and in self-consistent way.
| [
{
"created": "Wed, 21 Feb 2001 12:13:30 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Apr 2001 12:44:04 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jun 2001 13:23:27 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Gogohia",
"V.",
""
]
] | Using a system of the corresponding Schwinger-Dyson equations of motion, a pure dynamical theory of quark confinement and spontaneous breakdown of chiral symmetry is formulated. It is based on dominated in the QCD vacuum self-interaction of massless gluons only, i.e., without involving some extra degrees of freedom. This interaction becomes strongly singular in the deep infrared domain leading thus to the enhancement of zero momentum modes in the nonperturbative QCD vacuum. Using theory of distributions, complemented by the dimensional regularization method, we have explicitly shown that strong infrared singularities can be put under control. In this way a new phase in QCD, intrinsically nonperturbative QCD which is manifestly gauge invariant, was discovered. As a result, a highly nontrivial dynamical and topological structure of the QCD vacuum has emerged within our approach. We have also explicitly shown how infrared multiplicative renormalization program should be done in order to self-consistently remove all the strong infrared singularities from the theory. The corresponding convergence conditions play a crucial role in this program. In this theory any physical observables are determined by such correlation functions from which all types of the perturbative contributions should be subtracted, by definition. Theory is not only infrared finite but it is free from the ultraviolet divergences as well. It has a mass gap $\Delta > 0$, i.e., there are no physical states in the interval $(0, \Delta)$. It explains confinement, spontaneous breakdown of chiral symmetry and other nonperturbative effects on a general ground and in self-consistent way. |
hep-ph/0310182 | Ayres Freitas | A. Freitas, A. von Manteuffel, P. M. Zerwas | Slepton Production at e+e- and e-e- Linear Colliders | 50 pp, uses amsmath.sty, version to appear in EPJ C. Manuscript with
higher resolution figures available at
http://theory.fnal.gov/people/afreitas/ | Eur.Phys.J. C34 (2004) 487-512 | 10.1140/epjc/s2004-01744-2 | DESY 03-111, FERMILAB-Pub-03/314-T | hep-ph hep-ex | null | High-precision analyses are presented for the production of scalar sleptons,
selectrons and smuons in supersymmetric theories, at future e+e- and e-e-
linear colliders. Threshold production can be exploited for measurements of the
selectron and smuon masses, an essential ingredient for the reconstruction of
the fundamental supersymmetric theory at high scales. The production of
selectrons in the continuum will allow us to determine the Yukawa couplings in
the selectron sector, scrutinizing the identity of the Yukawa and gauge
couplings, which is a basic consequence of supersymmetry. The theoretical
predictions are elaborated at the one-loop level in the continuum, while at
threshold non-zero width effects and Sommerfeld rescattering corrections are
included. The phenomenological analyses are performed for e+e- and e-e- linear
colliders with energy up to about 1 TeV and with high integrated luminosity up
to 1 ab^-1 to cover the individual slepton channels separately with high
precision.
| [
{
"created": "Wed, 15 Oct 2003 15:46:25 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Mar 2004 20:24:23 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Freitas",
"A.",
""
],
[
"von Manteuffel",
"A.",
""
],
[
"Zerwas",
"P. M.",
""
]
] | High-precision analyses are presented for the production of scalar sleptons, selectrons and smuons in supersymmetric theories, at future e+e- and e-e- linear colliders. Threshold production can be exploited for measurements of the selectron and smuon masses, an essential ingredient for the reconstruction of the fundamental supersymmetric theory at high scales. The production of selectrons in the continuum will allow us to determine the Yukawa couplings in the selectron sector, scrutinizing the identity of the Yukawa and gauge couplings, which is a basic consequence of supersymmetry. The theoretical predictions are elaborated at the one-loop level in the continuum, while at threshold non-zero width effects and Sommerfeld rescattering corrections are included. The phenomenological analyses are performed for e+e- and e-e- linear colliders with energy up to about 1 TeV and with high integrated luminosity up to 1 ab^-1 to cover the individual slepton channels separately with high precision. |
2312.11291 | Matthias Wei{\ss}wange | Dominik St\"ockinger and Matthias Wei{\ss}wange | Full three-loop Renormalisation of an abelian chiral Gauge Theory with
non-anticommuting $\gamma_5$ in the BMHV Scheme | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work we present a complete three-loop renormalisation of an abelian
chiral gauge theory within the Breitenlohner-Maison/'t Hooft-Veltman (BMHV)
scheme of dimensional regularisation (DReg). In this scheme the
$\gamma_5$-matrix appearing in gauge interactions is a non-anticommuting
object, leading to a breaking of gauge and BRST invariance. Employing an
efficient method based on the quantum action principle, we obtain the complete
three-loop counterterm action which serves both to render the theory finite and
to restore gauge and BRST invariance. The UV singular counterterms involve not
only higher order $\epsilon$-poles but also new counterterm structures emerging
at the three-loop level for the first time; the finite symmetry-restoring
counterterms are restricted to the same structures as at lower loop orders,
just with different coefficients, aligning with our expectations. Both the
singular and the finite counterterms include structures which cannot be
obtained by the standard multiplicative renormalisation. Our results
demonstrate that a rigorous treatment of chiral gauge theories with $\gamma_5$
defined in the BMHV scheme at the multi-loop level is possible and that the
obtained counterterm action is suitable for computer implementations, allowing
automated calculations without ambiguities caused by $\gamma_5$.
| [
{
"created": "Mon, 18 Dec 2023 15:34:27 GMT",
"version": "v1"
}
] | 2023-12-19 | [
[
"Stöckinger",
"Dominik",
""
],
[
"Weißwange",
"Matthias",
""
]
] | In this work we present a complete three-loop renormalisation of an abelian chiral gauge theory within the Breitenlohner-Maison/'t Hooft-Veltman (BMHV) scheme of dimensional regularisation (DReg). In this scheme the $\gamma_5$-matrix appearing in gauge interactions is a non-anticommuting object, leading to a breaking of gauge and BRST invariance. Employing an efficient method based on the quantum action principle, we obtain the complete three-loop counterterm action which serves both to render the theory finite and to restore gauge and BRST invariance. The UV singular counterterms involve not only higher order $\epsilon$-poles but also new counterterm structures emerging at the three-loop level for the first time; the finite symmetry-restoring counterterms are restricted to the same structures as at lower loop orders, just with different coefficients, aligning with our expectations. Both the singular and the finite counterterms include structures which cannot be obtained by the standard multiplicative renormalisation. Our results demonstrate that a rigorous treatment of chiral gauge theories with $\gamma_5$ defined in the BMHV scheme at the multi-loop level is possible and that the obtained counterterm action is suitable for computer implementations, allowing automated calculations without ambiguities caused by $\gamma_5$. |
1906.11306 | Thomas Schaefer | Mauricio Martinez, Thomas Schaefer, Vladimir Skokov | Critical behavior of the bulk viscosity in QCD | 18 pages, 3 figures; version to appear in PRD | Phys. Rev. D 100, 074017 (2019) | 10.1103/PhysRevD.100.074017 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the behavior of the bulk viscosity $\zeta$ in QCD near a possible
critical endpoint in the phase diagram. We verify the expectation that
$(\zeta/s)\sim a(\xi/\xi_0)^{x_\zeta}$, where $s$ is the entropy density, $\xi$
is the correlation length, $\xi_0$ is the non-critical correlation length, $a$
is a constant and $x_\zeta\simeq 3$. Using a recently developed equation of
state that includes a critical point in the universality class of the Ising
model we estimate the constant of proportionality $a$. We find that $a$ is
typically quite small, $a\sim O(10^{-4})$. We observe, however, that the result
is sensitive to the commonly made assumption that the Ising temperature axis is
approximately aligned with the QCD baryon chemical potential axis. If this is
not the case, then the critical $\zeta/s$ can approach the non-critical value
of $\eta/s$, where $\eta$ is the shear viscosity, even if the enhancement of
the correlation length is modest, $\xi/\xi_0\sim 2$.
| [
{
"created": "Wed, 26 Jun 2019 19:34:35 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2019 17:21:38 GMT",
"version": "v2"
}
] | 2019-10-23 | [
[
"Martinez",
"Mauricio",
""
],
[
"Schaefer",
"Thomas",
""
],
[
"Skokov",
"Vladimir",
""
]
] | We study the behavior of the bulk viscosity $\zeta$ in QCD near a possible critical endpoint in the phase diagram. We verify the expectation that $(\zeta/s)\sim a(\xi/\xi_0)^{x_\zeta}$, where $s$ is the entropy density, $\xi$ is the correlation length, $\xi_0$ is the non-critical correlation length, $a$ is a constant and $x_\zeta\simeq 3$. Using a recently developed equation of state that includes a critical point in the universality class of the Ising model we estimate the constant of proportionality $a$. We find that $a$ is typically quite small, $a\sim O(10^{-4})$. We observe, however, that the result is sensitive to the commonly made assumption that the Ising temperature axis is approximately aligned with the QCD baryon chemical potential axis. If this is not the case, then the critical $\zeta/s$ can approach the non-critical value of $\eta/s$, where $\eta$ is the shear viscosity, even if the enhancement of the correlation length is modest, $\xi/\xi_0\sim 2$. |
2406.07643 | Subhojit Roy | Waleed Abdallah, Raj Gandhi, Tathgata Ghosh, Najimuddin Khan, Samiran
Roy, and Subhojit Roy | A 17 MeV pseudoscalar and the LSND, MiniBooNE and ATOMKI anomalies | 39 pages, 6 figures and 3 tables | null | null | HRI-RECAPP-2024-02 | hep-ph hep-ex | http://creativecommons.org/publicdomain/zero/1.0/ | In the absence of any new physics signals at the Large Hadron Collider (LHC),
anomalous results at low energy experiments have become the subject of
increased attention and scrutiny. We focus on three such results from the LSND,
MiniBooNE (MB), and ATOMKI experiments. A 17 MeV pseudoscalar mediator ($a'$)
can account for the excess events seen in $^8$Be and $^4$He pair creation
transitions in ATOMKI. We incorporate this mediator in a gauge invariant
extension of the Standard Model (SM) with a second Higgs doublet and three
singlet (seesaw) neutrinos ($N_i, i=1,2,3$). $N_{1,2}$ participate in an
interaction in MB and LSND which, with $a'$ as mediator, leads to the
production of $e^+ e^-$ pairs. The $N_i$ also lead to mass-squared differences
for SM neutrinos in agreement with global oscillation data. We first show that
such a model offers a clean and natural joint solution to the MB and LSND
excesses. We then examine the possibility of a common solution to all three
anomalies. Using the values of the couplings to the quarks and electrons which
are required to explain pair creation nuclear transition data for $^8$Be and
$^4$He in ATOMKI, we show that these values lead to excellent fits for MB and
LSND data as well, allowing for a common solution. We obtain a representative
solution space for this, in the context of an important constraint that comes
from the decay $K^+ \rightarrow \pi^+ a' \, (a'\rightarrow e^+e^-$). We also
discuss other constraints on the model from both collider and non-collider
experiments as well as those from electroweak precision data, stability and
unitarity. We compute the contributions to the electron and muon $g-2$ up to
two loops for our model and discuss the results in the context of the current
theoretical and empirical scenario vis a vis these parameters. Finally, we
discuss future tests of the model in upcoming experiments.
| [
{
"created": "Tue, 11 Jun 2024 18:17:02 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Abdallah",
"Waleed",
""
],
[
"Gandhi",
"Raj",
""
],
[
"Ghosh",
"Tathgata",
""
],
[
"Khan",
"Najimuddin",
""
],
[
"Roy",
"Samiran",
""
],
[
"Roy",
"Subhojit",
""
]
] | In the absence of any new physics signals at the Large Hadron Collider (LHC), anomalous results at low energy experiments have become the subject of increased attention and scrutiny. We focus on three such results from the LSND, MiniBooNE (MB), and ATOMKI experiments. A 17 MeV pseudoscalar mediator ($a'$) can account for the excess events seen in $^8$Be and $^4$He pair creation transitions in ATOMKI. We incorporate this mediator in a gauge invariant extension of the Standard Model (SM) with a second Higgs doublet and three singlet (seesaw) neutrinos ($N_i, i=1,2,3$). $N_{1,2}$ participate in an interaction in MB and LSND which, with $a'$ as mediator, leads to the production of $e^+ e^-$ pairs. The $N_i$ also lead to mass-squared differences for SM neutrinos in agreement with global oscillation data. We first show that such a model offers a clean and natural joint solution to the MB and LSND excesses. We then examine the possibility of a common solution to all three anomalies. Using the values of the couplings to the quarks and electrons which are required to explain pair creation nuclear transition data for $^8$Be and $^4$He in ATOMKI, we show that these values lead to excellent fits for MB and LSND data as well, allowing for a common solution. We obtain a representative solution space for this, in the context of an important constraint that comes from the decay $K^+ \rightarrow \pi^+ a' \, (a'\rightarrow e^+e^-$). We also discuss other constraints on the model from both collider and non-collider experiments as well as those from electroweak precision data, stability and unitarity. We compute the contributions to the electron and muon $g-2$ up to two loops for our model and discuss the results in the context of the current theoretical and empirical scenario vis a vis these parameters. Finally, we discuss future tests of the model in upcoming experiments. |
2403.02099 | Wei He | Wei He, De-Shun Zhang, Zhi-Feng Sun | The $Z_b$ states as the mixture of the molecular and
diquark-anti-diquark components within the effective field theory | 9 pages, 2 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we reconsider the states $Z_b(10610)$ and $Z_b(10650)$ by
investigating the presence of diquark-anti-diquark components as well as the
hadronic molecule components in the framework of effective field theory. The
different masses of pseudoscalar mesons such as $\pi^{0}$, $\eta_{8}$, and
$\eta_{0}$, as well as vector mesons like $\rho^{0}$ and $\omega$ violate the
OZI rule that is well depicted under the $[U(3)_L\otimes
U(3)_R]_{global}\otimes [U(3)_V]_{local}$ symmetry. To account for the
contribution of intermediate bosons of heavy masses within the OBE model, we
introduce an exponential form factor instead of the commonly used monopole form
factor in the past. By solving the coupled-channel Schr\"{o}dinger equation
with the Gaussian expansion method, our numerical results indicate that the
$Z_b(10610)$ and $Z_b(10650)$ states can be explained as hadronic molecules
slightly mixing with diquark-anti-diquark states.
| [
{
"created": "Mon, 4 Mar 2024 14:56:16 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2024 06:19:36 GMT",
"version": "v2"
}
] | 2024-03-27 | [
[
"He",
"Wei",
""
],
[
"Zhang",
"De-Shun",
""
],
[
"Sun",
"Zhi-Feng",
""
]
] | In this study, we reconsider the states $Z_b(10610)$ and $Z_b(10650)$ by investigating the presence of diquark-anti-diquark components as well as the hadronic molecule components in the framework of effective field theory. The different masses of pseudoscalar mesons such as $\pi^{0}$, $\eta_{8}$, and $\eta_{0}$, as well as vector mesons like $\rho^{0}$ and $\omega$ violate the OZI rule that is well depicted under the $[U(3)_L\otimes U(3)_R]_{global}\otimes [U(3)_V]_{local}$ symmetry. To account for the contribution of intermediate bosons of heavy masses within the OBE model, we introduce an exponential form factor instead of the commonly used monopole form factor in the past. By solving the coupled-channel Schr\"{o}dinger equation with the Gaussian expansion method, our numerical results indicate that the $Z_b(10610)$ and $Z_b(10650)$ states can be explained as hadronic molecules slightly mixing with diquark-anti-diquark states. |
hep-ph/0306064 | Tom Steele | V. Elias, D.G.C. McKeon, T.G. Steele | Transmutation of Scale Dependence into Truncation Uncertainty via
RG-Improvement of the $R(s)$ Series | 11 pages, LateX | Phys.Rev. D69 (2004) 045015 | 10.1103/PhysRevD.69.045015 | null | hep-ph | null | The arbitrariness in how the logarithm is defined within the QCD series for
the inclusive electroproduction cross-section is shown to affect the summation
to all orders in $\alpha_s$ of leading and successively-subleading logarithms
within that perturbative series, even though such summations largely eliminate
the residual dependence of the original series on the arbitrary renormalization
scale $\mu$. However, given that the original (unimproved) series is known to
third-order in $\alpha_s(\mu)$, this logarithm ambiguity is shown not to enter
the optimally improved summation-of-logarithms series until the term
fourth-order in $\alpha_s(s)$, where $s$ is the physical center-of-mass energy
squared. Consequently, the ambiguity in how the logarithm is defined is
absorbable in the uncertainty associated with truncating the original
perturbative series after its calculationally known terms.
| [
{
"created": "Fri, 6 Jun 2003 23:07:48 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2003 18:31:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Elias",
"V.",
""
],
[
"McKeon",
"D. G. C.",
""
],
[
"Steele",
"T. G.",
""
]
] | The arbitrariness in how the logarithm is defined within the QCD series for the inclusive electroproduction cross-section is shown to affect the summation to all orders in $\alpha_s$ of leading and successively-subleading logarithms within that perturbative series, even though such summations largely eliminate the residual dependence of the original series on the arbitrary renormalization scale $\mu$. However, given that the original (unimproved) series is known to third-order in $\alpha_s(\mu)$, this logarithm ambiguity is shown not to enter the optimally improved summation-of-logarithms series until the term fourth-order in $\alpha_s(s)$, where $s$ is the physical center-of-mass energy squared. Consequently, the ambiguity in how the logarithm is defined is absorbable in the uncertainty associated with truncating the original perturbative series after its calculationally known terms. |
hep-ph/0312025 | David London | Veronique Page and David London | CP Violation in B -> rho pi: New Physics Signals | 8 pages, 1 figure (included), plain LaTeX. Analysis modified: QCD
factorization used instead of naive factorization; larger |P/T| range taken;
figure changed; other minor changes; references updated. To be published in
PRD: Brief Reports | Phys.Rev. D70 (2004) 017501 | 10.1103/PhysRevD.70.017501 | UdeM-GPP-TH-03-116, McGill/03-27 | hep-ph | null | A Dalitz-plot analysis of Bd(t) -> rho pi -> pi+ pi- pi0 decays allows one to
obtain the CP-violating phase \alpha. In addition, one can extract the various
tree (T) and penguin (P) amplitudes contributing to these decays. By comparing
the measured value of |P/T| with the theoretical prediction, one can detect the
presence of physics beyond the standard model.
| [
{
"created": "Tue, 2 Dec 2003 03:26:28 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jun 2004 12:10:41 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Page",
"Veronique",
""
],
[
"London",
"David",
""
]
] | A Dalitz-plot analysis of Bd(t) -> rho pi -> pi+ pi- pi0 decays allows one to obtain the CP-violating phase \alpha. In addition, one can extract the various tree (T) and penguin (P) amplitudes contributing to these decays. By comparing the measured value of |P/T| with the theoretical prediction, one can detect the presence of physics beyond the standard model. |
hep-ph/9612424 | Ann Heinson | A.P. Heinson (UC Riverside), A.S. Belyaev and E.E. Boos (Moscow State
University) | Single top quarks at the Fermilab Tevatron | 31 pages including 11 figures | Phys.Rev.D56:3114-3128,1997 | 10.1103/PhysRevD.56.3114 | INP-MSU-96-41/448, UCR/96-25 | hep-ph | null | We present a calculation of the single top quark cross section for
proton-antiproton interactions with sqrt(s) = 1.8 TeV at the Fermilab Tevatron
collider. We examine the effects of top mass, parton distribution functions,
QCD scale, and collision energy, on each of the component production
mechanisms, and study the kinematic distributions for standard model
electroweak production. At the upgraded Tevatron with sqrt(s) = 2.0 TeV and
high luminosity, it will be possible to test the nature of the Wtb coupling
using single top production. We estimate the sensitivity to measure the single
top cross section, and thus to directly measure V_tb and the top quark partial
width. We show what happens to the V_tb measurement when an anomalous (V+A)
component is added to the Wtb coupling, and how the top quark polarization
affects the kinematic distributions.
| [
{
"created": "Thu, 19 Dec 1996 23:14:10 GMT",
"version": "v1"
}
] | 2009-02-18 | [
[
"Heinson",
"A. P.",
"",
"UC Riverside"
],
[
"Belyaev",
"A. S.",
"",
"Moscow State\n University"
],
[
"Boos",
"E. E.",
"",
"Moscow State\n University"
]
] | We present a calculation of the single top quark cross section for proton-antiproton interactions with sqrt(s) = 1.8 TeV at the Fermilab Tevatron collider. We examine the effects of top mass, parton distribution functions, QCD scale, and collision energy, on each of the component production mechanisms, and study the kinematic distributions for standard model electroweak production. At the upgraded Tevatron with sqrt(s) = 2.0 TeV and high luminosity, it will be possible to test the nature of the Wtb coupling using single top production. We estimate the sensitivity to measure the single top cross section, and thus to directly measure V_tb and the top quark partial width. We show what happens to the V_tb measurement when an anomalous (V+A) component is added to the Wtb coupling, and how the top quark polarization affects the kinematic distributions. |
2111.12635 | Igor Anikin | I.V. Anikin, L. Szymanowski | Alignment function as a new kind of transverse momentum dependent
functions | 13 pages, 1 Figure; altered version: explanations and clarifications
added | null | 10.1140/epja/s10050-022-00794-8 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We argue the existence of new $k_\perp$-dependent functions which can be
manifested in the Drell-Yan (SIDIS)-like processes. The presented new functions
resemble the well-known Boer-Mulders function associated with the quark spin
asymmetry, but in contrast they are sensitive to the transverse motion of
partons inside the hadron due to the collective alignment of quark spin
vectors.
| [
{
"created": "Wed, 24 Nov 2021 17:13:41 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2021 17:26:11 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Feb 2022 15:21:10 GMT",
"version": "v3"
}
] | 2022-09-14 | [
[
"Anikin",
"I. V.",
""
],
[
"Szymanowski",
"L.",
""
]
] | We argue the existence of new $k_\perp$-dependent functions which can be manifested in the Drell-Yan (SIDIS)-like processes. The presented new functions resemble the well-known Boer-Mulders function associated with the quark spin asymmetry, but in contrast they are sensitive to the transverse motion of partons inside the hadron due to the collective alignment of quark spin vectors. |
hep-ph/0009121 | Armin Boehrer | A. Boehrer | Heavy Quark Production in $\gamma\gamma$ Collisions | 3 pages, Talk given at the ICHEP'2000, Osaka, To appear in the
proceedings | null | null | SI-2000-8 | hep-ph | null | New results on inclusive heavy quark production in gamma gamma collisions are
presented. Charm and bottom production are investigated at LEP II energies by
the experiments ALEPH, DELPHI, L3, and OPAL. The total and differential cross
sections for charm quarks are measured. The contributions from the direct and
single-resolved processes are separated and their fractions quantified. More
detailed studies, such as the dependence of the cross section on the two-photon
centre-of-mass energy and the charm structure function F^2_gamma,c, are
reported. The inclusive bottom cross section is presented. Measurements are
compared to next-to-leading order calculations.
| [
{
"created": "Mon, 11 Sep 2000 14:58:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Boehrer",
"A.",
""
]
] | New results on inclusive heavy quark production in gamma gamma collisions are presented. Charm and bottom production are investigated at LEP II energies by the experiments ALEPH, DELPHI, L3, and OPAL. The total and differential cross sections for charm quarks are measured. The contributions from the direct and single-resolved processes are separated and their fractions quantified. More detailed studies, such as the dependence of the cross section on the two-photon centre-of-mass energy and the charm structure function F^2_gamma,c, are reported. The inclusive bottom cross section is presented. Measurements are compared to next-to-leading order calculations. |
2003.10631 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the tetraquark and hexaquark molecular states with the QCD
sum rules | 22 pages, 18 figures. arXiv admin note: text overlap with
arXiv:2002.06202 | Commun. Theor. Phys. 73 (2021) 065201 | 10.1088/1572-9494/abee0d | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this article, we construct the color-singlet-color-singlet type currents
and the color-singlet-color-singlet-color-singlet type currents to study the
scalar $D^*\bar{D}^*$, $D^*D^*$ tetraquark molecular states and the vector
$D^*D^*\bar{D}^*$, $D^*D^*D^*$ hexaquark molecular states with the QCD sum
rules in details. In calculations, we choose the pertinent energy scales of the
QCD spectral densities with the energy scale formula
$\mu=\sqrt{M^2_{T}-(2{\mathbb{M}}_c)^2}$ and
$\sqrt{M^2_{H}-(3{\mathbb{M}}_c)^2}$ for the tetraquark and hexaquark molecular
states respectively in a consistent way. We obtain stable QCD sum rules for the
scalar $D^*\bar{D}^*$, $D^*D^*$ tetraquark molecular states and the vector
$D^*D^*\bar{D}^*$ hexaquark molecular state, but cannot obtain stable QCD sum
rules for the vector $D^*D^*D^*$ hexaquark molecular state. The connected
(nonfactorizable) Feynman diagrams at the tree level (or the lowest order) and
their induced diagrams via substituting the quark lines make positive
contributions for the scalar $D^*D^*$ tetraquark molecular state, but make
negative or destructive contributions for the vector $D^*D^*D^*$ hexaquark
molecular state. It is of no use or meaningless to distinguish the factorizable
and nonfactorizable properties of the Feynman diagrams in the color space in
the operator product expansion so as to interpret them in terms of the hadronic
observables, we can only obtain information about the short-distance and
long-distance contributions.
| [
{
"created": "Tue, 24 Mar 2020 03:01:14 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Aug 2020 03:27:15 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Feb 2021 08:13:31 GMT",
"version": "v3"
}
] | 2021-04-13 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we construct the color-singlet-color-singlet type currents and the color-singlet-color-singlet-color-singlet type currents to study the scalar $D^*\bar{D}^*$, $D^*D^*$ tetraquark molecular states and the vector $D^*D^*\bar{D}^*$, $D^*D^*D^*$ hexaquark molecular states with the QCD sum rules in details. In calculations, we choose the pertinent energy scales of the QCD spectral densities with the energy scale formula $\mu=\sqrt{M^2_{T}-(2{\mathbb{M}}_c)^2}$ and $\sqrt{M^2_{H}-(3{\mathbb{M}}_c)^2}$ for the tetraquark and hexaquark molecular states respectively in a consistent way. We obtain stable QCD sum rules for the scalar $D^*\bar{D}^*$, $D^*D^*$ tetraquark molecular states and the vector $D^*D^*\bar{D}^*$ hexaquark molecular state, but cannot obtain stable QCD sum rules for the vector $D^*D^*D^*$ hexaquark molecular state. The connected (nonfactorizable) Feynman diagrams at the tree level (or the lowest order) and their induced diagrams via substituting the quark lines make positive contributions for the scalar $D^*D^*$ tetraquark molecular state, but make negative or destructive contributions for the vector $D^*D^*D^*$ hexaquark molecular state. It is of no use or meaningless to distinguish the factorizable and nonfactorizable properties of the Feynman diagrams in the color space in the operator product expansion so as to interpret them in terms of the hadronic observables, we can only obtain information about the short-distance and long-distance contributions. |
1103.2334 | Emerson Luna | E.G.S. Luna | Diffraction phenomenology with massive gluons: some recent developments | Invited keynote talk at Diffractive and Electromagnetic Processes at
the LHC, Trento, Italy, January 2010; invited talk at XI Hadron Physics,
Maresias, Brazil, March 2010 | AIP Conf.Proc.1296:183-188,2010 | 10.1063/1.3523165 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we introduce the main features of a QCD-based model in which the
coupling $\alpha_{s}$ is constrained by an infrared mass scale. We show recent
applications of this model to hadron-hadron collisions, gap survival
probability calculations, and soft gluon resummation techniques. These results
indicate a smooth transition from non-perturbative to perturbative behaviour of
the QCD.
| [
{
"created": "Fri, 11 Mar 2011 18:34:03 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Luna",
"E. G. S.",
""
]
] | In this talk we introduce the main features of a QCD-based model in which the coupling $\alpha_{s}$ is constrained by an infrared mass scale. We show recent applications of this model to hadron-hadron collisions, gap survival probability calculations, and soft gluon resummation techniques. These results indicate a smooth transition from non-perturbative to perturbative behaviour of the QCD. |
2305.19325 | Pablo Sesma | Raffaele Tito D'Agnolo, Florian Nortier, Gabriele Rigo, Pablo Sesma | The Two Scales of New Physics in Higgs Couplings | 41 pages + references, 14 figures. v2: JHEP version | JHEP 08 (2023) 019 | 10.1007/JHEP08(2023)019 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs coupling deviations from Standard Model predictions contain information
about two scales of Nature: that of new physics responsible for the deviation,
and the scale where new bosons must appear. The two can coincide, but they do
not have to. The scale of new bosons can be calculated by going beyond an
effective field theory description of the coupling deviation. We compute
model-independent upper bounds on the scale of new bosons for deviations in
Higgs to $WW$ and $ZZ$ couplings, finding that any measured deviation at
present or future colliders requires the existence of new bosons within
experimental reach. This has potentially interesting implications for
naturalness.
| [
{
"created": "Tue, 30 May 2023 18:00:06 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Aug 2023 09:23:30 GMT",
"version": "v2"
}
] | 2023-08-11 | [
[
"D'Agnolo",
"Raffaele Tito",
""
],
[
"Nortier",
"Florian",
""
],
[
"Rigo",
"Gabriele",
""
],
[
"Sesma",
"Pablo",
""
]
] | Higgs coupling deviations from Standard Model predictions contain information about two scales of Nature: that of new physics responsible for the deviation, and the scale where new bosons must appear. The two can coincide, but they do not have to. The scale of new bosons can be calculated by going beyond an effective field theory description of the coupling deviation. We compute model-independent upper bounds on the scale of new bosons for deviations in Higgs to $WW$ and $ZZ$ couplings, finding that any measured deviation at present or future colliders requires the existence of new bosons within experimental reach. This has potentially interesting implications for naturalness. |
1602.02380 | Evgeny Zhemchugov | S. I. Godunov, A. N. Rozanov, M. I. Vysotsky, E. V. Zhemchugov | New Physics at 1 TeV? | 7 pages, 4 figures, 1 table | null | 10.1134/S0021364016090101 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If decays of a heavy particle S are responsible for the diphoton excess with
invariant mass 750 GeV observed at the 13 TeV LHC run, it can be easily
accomodated in the Standard Model. Two scenarios are considered: production in
gluon fusion through a loop of heavy isosinglet quark(s) and production in
photon fusion through a loop of heavy isosinglet leptons. In the second case
many heavy leptons are needed or/and they should have large electric charges in
order to reproduce experimental data on $\sigma(pp \to SX) \cdot \mathrm{Br}(S
\to \gamma \gamma)$.
| [
{
"created": "Sun, 7 Feb 2016 15:21:39 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Godunov",
"S. I.",
""
],
[
"Rozanov",
"A. N.",
""
],
[
"Vysotsky",
"M. I.",
""
],
[
"Zhemchugov",
"E. V.",
""
]
] | If decays of a heavy particle S are responsible for the diphoton excess with invariant mass 750 GeV observed at the 13 TeV LHC run, it can be easily accomodated in the Standard Model. Two scenarios are considered: production in gluon fusion through a loop of heavy isosinglet quark(s) and production in photon fusion through a loop of heavy isosinglet leptons. In the second case many heavy leptons are needed or/and they should have large electric charges in order to reproduce experimental data on $\sigma(pp \to SX) \cdot \mathrm{Br}(S \to \gamma \gamma)$. |
hep-ph/0105009 | Krishna Rajagopal | Mark Alford (Glasgow University), Krishna Rajagopal (MIT), Sanjay
Reddy (INT, University of Washington), Frank Wilczek (MIT) | The Minimal CFL-Nuclear Interface | 30 pages, 7 figures | Phys.Rev. D64 (2001) 074017 | 10.1103/PhysRevD.64.074017 | GUTPA/01/04/03, MIT-CTP-3123, DOE/ER/41132-110-INT01 | hep-ph astro-ph nucl-th | null | At nuclear matter density, electrically neutral strongly interacting matter
in weak equilibrium is made of neutrons, protons and electrons. At sufficiently
high density, such matter is made of up, down and strange quarks in the
color-flavor locked phase, with no electrons. As a function of increasing
density (or, perhaps, increasing depth in a compact star) other phases may
intervene between these two phases which are guaranteed to be present. The
simplest possibility, however, is a single first order phase transition between
CFL and nuclear matter. Such a transition, in space, could take place either
through a mixed phase region or at a single sharp interface with electron-free
CFL and electron-rich nuclear matter in stable contact. Here we construct a
model for such an interface. It is characterized by a region of separated
charge, similar to an inversion layer at a metal-insulator boundary. On the CFL
side, the charged boundary layer is dominated by a condensate of negative
kaons. We then consider the energetics of the mixed phase alternative. We find
that the mixed phase will occur only if the nuclear-CFL surface tension is
significantly smaller than dimensional analysis would indicate.
| [
{
"created": "Tue, 1 May 2001 22:52:35 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Alford",
"Mark",
"",
"Glasgow University"
],
[
"Rajagopal",
"Krishna",
"",
"MIT"
],
[
"Reddy",
"Sanjay",
"",
"INT, University of Washington"
],
[
"Wilczek",
"Frank",
"",
"MIT"
]
] | At nuclear matter density, electrically neutral strongly interacting matter in weak equilibrium is made of neutrons, protons and electrons. At sufficiently high density, such matter is made of up, down and strange quarks in the color-flavor locked phase, with no electrons. As a function of increasing density (or, perhaps, increasing depth in a compact star) other phases may intervene between these two phases which are guaranteed to be present. The simplest possibility, however, is a single first order phase transition between CFL and nuclear matter. Such a transition, in space, could take place either through a mixed phase region or at a single sharp interface with electron-free CFL and electron-rich nuclear matter in stable contact. Here we construct a model for such an interface. It is characterized by a region of separated charge, similar to an inversion layer at a metal-insulator boundary. On the CFL side, the charged boundary layer is dominated by a condensate of negative kaons. We then consider the energetics of the mixed phase alternative. We find that the mixed phase will occur only if the nuclear-CFL surface tension is significantly smaller than dimensional analysis would indicate. |
1211.4850 | Jay Tasson | Jay D. Tasson | Lorentz violation, gravitomagnetism, and intrinsic spin | 5 pages, accepted for publication in Phys. Rev. D | Phys. Rev. D 86, 124021 (2012) | 10.1103/PhysRevD.86.124021 | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A largely unconstrained set of relativity-violating effects is studied via
the gravitomagnetic effect on intrinsic spins. The results of existing
comagnetometer experiments are used to place constraints on two new
combinations of these effects at the 10% level. We show that planned
improvements in these experiments will make them competitive with the best
existing sensitivities to this elusive class of relativity-violating effects.
Prospects for measuring the conventional General-Relativistic gravitomagnetic
effect are also considered.
| [
{
"created": "Tue, 20 Nov 2012 20:17:36 GMT",
"version": "v1"
}
] | 2013-08-07 | [
[
"Tasson",
"Jay D.",
""
]
] | A largely unconstrained set of relativity-violating effects is studied via the gravitomagnetic effect on intrinsic spins. The results of existing comagnetometer experiments are used to place constraints on two new combinations of these effects at the 10% level. We show that planned improvements in these experiments will make them competitive with the best existing sensitivities to this elusive class of relativity-violating effects. Prospects for measuring the conventional General-Relativistic gravitomagnetic effect are also considered. |
1311.2347 | Yuji Kajiyama | Yuji Kajiyama, Akari Sato, Wakako Sato and Aya Suzuki | One-parameter Neutrino Mass Matrix and Symmetry Realization | 14pages, 4figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Majorana neutrino mass matrix $M_{\nu}$ with one parameter
in the context of two texture zeros and its symmetry realization by non-Abelian
discrete symmetry. From numerical calculation, we confirm that the textures
$(M_{\nu})_{11,12}=0$ and $(M_{\nu})_{11,13}=0$ are consistent with the current
experimental constraints, and show the correlations between non-zero elements
of $M_{\nu}$. The ratios of non-zero elements of $M_{\nu}$ are constrain in
small regions, and we find simple examples of $M_{\nu}$ with one real mass
parameter. We also discuss symmetry realization of the mass matrix by the
type-II seesaw mechanism based on the binary icosahedral symmetry $A_5'$ .
| [
{
"created": "Mon, 11 Nov 2013 04:09:55 GMT",
"version": "v1"
}
] | 2013-11-12 | [
[
"Kajiyama",
"Yuji",
""
],
[
"Sato",
"Akari",
""
],
[
"Sato",
"Wakako",
""
],
[
"Suzuki",
"Aya",
""
]
] | We investigate the Majorana neutrino mass matrix $M_{\nu}$ with one parameter in the context of two texture zeros and its symmetry realization by non-Abelian discrete symmetry. From numerical calculation, we confirm that the textures $(M_{\nu})_{11,12}=0$ and $(M_{\nu})_{11,13}=0$ are consistent with the current experimental constraints, and show the correlations between non-zero elements of $M_{\nu}$. The ratios of non-zero elements of $M_{\nu}$ are constrain in small regions, and we find simple examples of $M_{\nu}$ with one real mass parameter. We also discuss symmetry realization of the mass matrix by the type-II seesaw mechanism based on the binary icosahedral symmetry $A_5'$ . |
1111.4968 | Haitham Zaraket H. | Alaa Dbeyssi, Dima Al Dirani and H. Zaraket | Synchrotron radiation in a chromo-magnetic field | Accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.84.105033 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the generalization of QED synchrotron radiation to the QCD case with
a chromomagnetic field using the Schwinger {\it et al} source method. It is
shown that the QED case can be obtained as a special limit. The comparison with
the path integral approach of Zakharov has shown consistent results.
| [
{
"created": "Mon, 21 Nov 2011 18:40:11 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Dbeyssi",
"Alaa",
""
],
[
"Dirani",
"Dima Al",
""
],
[
"Zaraket",
"H.",
""
]
] | We study the generalization of QED synchrotron radiation to the QCD case with a chromomagnetic field using the Schwinger {\it et al} source method. It is shown that the QED case can be obtained as a special limit. The comparison with the path integral approach of Zakharov has shown consistent results. |
hep-ph/0505261 | Michael Strickland | Anton Rebhan, Paul Romatschke, and Michael Strickland | Dynamics of Quark-Gluon-Plasma Instabilities in Discretized Hard-Loop
Approximation | 30 pages, 16 figures. v3 typos fixed | JHEP0509:041,2005 | 10.1088/1126-6708/2005/09/041 | TUW-05-09, HIP-2005-25/TH, BI-TP 2005/17 | hep-ph | null | Non-Abelian plasma instabilities have been proposed as a possible explanation
for fast isotropization of the quark-gluon plasma produced in relativistic
heavy-ion collisions. We study the real-time evolution of these instabilities
in non-Abelian plasmas with a momentum-space anisotropy using a hard-loop
effective theory that is discretized in the velocities of hard particles. We
extend our previous results on the evolution of the most unstable modes, which
are constant in directions transverse to the direction of anisotropy, from
gauge group SU(2) to SU(3). We also present first full 3+1-dimensional
simulation results based on velocity-discretized hard loops. In contrast to the
effectively 1+1-dimensional transversely constant modes we find subexponential
behaviour at late times.
| [
{
"created": "Tue, 31 May 2005 19:53:36 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Aug 2005 19:33:51 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Sep 2005 21:08:39 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Rebhan",
"Anton",
""
],
[
"Romatschke",
"Paul",
""
],
[
"Strickland",
"Michael",
""
]
] | Non-Abelian plasma instabilities have been proposed as a possible explanation for fast isotropization of the quark-gluon plasma produced in relativistic heavy-ion collisions. We study the real-time evolution of these instabilities in non-Abelian plasmas with a momentum-space anisotropy using a hard-loop effective theory that is discretized in the velocities of hard particles. We extend our previous results on the evolution of the most unstable modes, which are constant in directions transverse to the direction of anisotropy, from gauge group SU(2) to SU(3). We also present first full 3+1-dimensional simulation results based on velocity-discretized hard loops. In contrast to the effectively 1+1-dimensional transversely constant modes we find subexponential behaviour at late times. |
0904.4450 | Ernest Ma | Ernest Ma (UC Riverside) | Radiative Inverse Seesaw: Verifiable New Mechanism of Neutrino Mass | 11 pages, 3 figures | Phys.Rev.D80:013013,2009 | 10.1103/PhysRevD.80.013013 | UCRHEP-T467 (April 2009) | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the canonical seesaw mechanism alone is responsible for neutrino mass,
i.e. m_nu = -m_D^2/m_N, it can neither be proved nor disproved at the TeV
energy scale. A new verifiable mechanism of neutrino mass is proposed, using
the "inverse" seesaw, with new physics at the TeV scale, such that m_nu = m_D^2
epsilon_L/m_N^2, where epsilon_L is a two-loop effect. Dark-matter candidates
also appear naturally.
| [
{
"created": "Tue, 28 Apr 2009 17:31:50 GMT",
"version": "v1"
}
] | 2009-09-02 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | If the canonical seesaw mechanism alone is responsible for neutrino mass, i.e. m_nu = -m_D^2/m_N, it can neither be proved nor disproved at the TeV energy scale. A new verifiable mechanism of neutrino mass is proposed, using the "inverse" seesaw, with new physics at the TeV scale, such that m_nu = m_D^2 epsilon_L/m_N^2, where epsilon_L is a two-loop effect. Dark-matter candidates also appear naturally. |
1206.4024 | Piotr Kotko | Piotr Kotko, Wojciech Slominski | General Mass Scheme for Jet Production in DIS | 6 pages, 2 figures | null | 10.1103/PhysRevD.86.094008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a method for calculating DIS jet production cross sections in QCD
at NLO accuracy with consistent treatment of heavy quarks. The scheme relies on
the dipole subtraction method for jets, which we extend to all possible initial
state splittings with heavy partons, so that the Aivazis-Collins-Olness-Tung
massive collinear factorization scheme (ACOT) can be applied. As a first check
of the formalism we recover the ACOT result for the heavy quark structure
function using a dedicated Monte Carlo program.
| [
{
"created": "Mon, 18 Jun 2012 19:25:59 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Kotko",
"Piotr",
""
],
[
"Slominski",
"Wojciech",
""
]
] | We propose a method for calculating DIS jet production cross sections in QCD at NLO accuracy with consistent treatment of heavy quarks. The scheme relies on the dipole subtraction method for jets, which we extend to all possible initial state splittings with heavy partons, so that the Aivazis-Collins-Olness-Tung massive collinear factorization scheme (ACOT) can be applied. As a first check of the formalism we recover the ACOT result for the heavy quark structure function using a dedicated Monte Carlo program. |
1512.08172 | Yachao Qian | Yachao Qian and Ismail Zahed | Spin Physics through QCD Instantons | 19 pages, 14 figures | Annals Phys. 374, 314 (2016) | 10.1016/j.aop.2016.09.002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review some aspects of spin physics where QCD instantons play an important
role. In particular, their large contributions in semi-inclusive deep-inelastic
scattering and polarized proton on proton scattering. We also review their
possible contribution in the $\mathcal{P}$-odd pion azimuthal charge
correlations in peripheral $AA$ scattering at collider energies.
| [
{
"created": "Sun, 27 Dec 2015 05:34:17 GMT",
"version": "v1"
}
] | 2021-02-10 | [
[
"Qian",
"Yachao",
""
],
[
"Zahed",
"Ismail",
""
]
] | We review some aspects of spin physics where QCD instantons play an important role. In particular, their large contributions in semi-inclusive deep-inelastic scattering and polarized proton on proton scattering. We also review their possible contribution in the $\mathcal{P}$-odd pion azimuthal charge correlations in peripheral $AA$ scattering at collider energies. |
hep-ph/0609276 | Rumin Wang | Ru-Min Wang, G. R. Lu, En-Ke Wang and Ya-Dong Yang | Probe the R-parity Violating Supersymmetry Effects in the
$B^0_s-\bar{B}^0_s$ Mixing | 11 pages, 4 figures, to appear in High Energy Physics And Nuclear
Physcis | High Energy Phys.Nucl.Phys.31:332,2007 | null | null | hep-ph | null | The recent measurements of the $B_s$ mass difference $\Delta M_s$ by the CDF
and D{\O} collaborations are roughly consistent with the Standard Model
predictions, therefore, these measurements will afford an opportunity to
constrain new physics scenarios beyond the Standard Model. We consider the
impact of the R-parity violating supersymmetry in the $B^0_s-\bar{B}^0_s$
mixing, and use the latest experimental results of $\Delta M_s$ to constrain
the size of the R-parity violating tree level couplings in the
$B^0_s-\bar{B}^0_s$ mixing. Then, using the constrained R-parity violating
parameter space from $\Delta M_s$, we show the R-parity violating effects on
the $B_s$ width difference $\Delta\Gamma_{s}$.
| [
{
"created": "Wed, 27 Sep 2006 07:34:05 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2006 12:15:46 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Wang",
"Ru-Min",
""
],
[
"Lu",
"G. R.",
""
],
[
"Wang",
"En-Ke",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | The recent measurements of the $B_s$ mass difference $\Delta M_s$ by the CDF and D{\O} collaborations are roughly consistent with the Standard Model predictions, therefore, these measurements will afford an opportunity to constrain new physics scenarios beyond the Standard Model. We consider the impact of the R-parity violating supersymmetry in the $B^0_s-\bar{B}^0_s$ mixing, and use the latest experimental results of $\Delta M_s$ to constrain the size of the R-parity violating tree level couplings in the $B^0_s-\bar{B}^0_s$ mixing. Then, using the constrained R-parity violating parameter space from $\Delta M_s$, we show the R-parity violating effects on the $B_s$ width difference $\Delta\Gamma_{s}$. |
hep-ph/9506396 | Fawzi Boudjema | M. Baillargeon, F.Boudjema, E. Chopin, V. Lafage | New Physics with three-photon events at LEP | No changes made from previous version, 34 pages, LateX, uses epsf, 11
.eps figs., full paper (including figs) is also available via WWW at
http://lapphp0.in2p3.fr/preplapp/psth/lastee3g.ps.gz or via anonymous ftp at
ftp:///lapphp0.in2p3.fr/pub/preprints-theorie/ftpee3g.uu | Z.Phys.C71:431-442,1996 | 10.1007/s002880050188 | ENSLAPP-A-518/95 and FISIST/6-95/CFIF | hep-ph | null | The effect of the most general \z3gt vertex in the reaction $e^+e^- \ra
3\gamma$ is studied with a particular attention to LEP searches. We give exact
analytical expressions including realistic cuts for the signal and present a
detailed analysis based on a Monte Carlo that includes the effect of the
irreducible $3\gamma$ QED cross section. As special applications we discuss the
effect of heavy scalars, fermions and gauge bosons and comment on the
``monopole" connection.
| [
{
"created": "Thu, 22 Jun 1995 16:16:02 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 1996 16:27:43 GMT",
"version": "v2"
}
] | 2019-08-15 | [
[
"Baillargeon",
"M.",
""
],
[
"Boudjema",
"F.",
""
],
[
"Chopin",
"E.",
""
],
[
"Lafage",
"V.",
""
]
] | The effect of the most general \z3gt vertex in the reaction $e^+e^- \ra 3\gamma$ is studied with a particular attention to LEP searches. We give exact analytical expressions including realistic cuts for the signal and present a detailed analysis based on a Monte Carlo that includes the effect of the irreducible $3\gamma$ QED cross section. As special applications we discuss the effect of heavy scalars, fermions and gauge bosons and comment on the ``monopole" connection. |
hep-ph/0411053 | Dan Hooper | Edward A. Baltz and Dan Hooper | Kaluza-Klein Dark Matter, Electrons and Gamma Ray Telescopes | 10 pages, 2 figures | JCAP 0507:001,2005 | 10.1088/1475-7516/2005/07/001 | null | hep-ph astro-ph | null | Kaluza-Klein dark matter particles can annihilate efficiently into
electron-positron pairs, providing a discrete feature (a sharp edge) in the
cosmic $e^+ e^-$ spectrum at an energy equal to the particle's mass (typically
several hundred GeV to one TeV). Although this feature is probably beyond the
reach of satellite or balloon-based cosmic ray experiments (those that
distinguish the charge and mass of the primary particle), gamma ray telescopes
may provide an alternative detection method. Designed to observe very
high-energy gamma-rays, ACTs also observe the diffuse flux of electron-induced
electromagnetic showers. The GLAST satellite, designed for gamma ray astronomy,
will also observe any high energy showers (several hundred GeV and above) in
its calorimeter. We show that high-significance detections of an
electron-positron feature from Kaluza-Klein dark matter annihilations are
possible with GLAST, and also with ACTs such as HESS, VERITAS or MAGIC.
| [
{
"created": "Wed, 3 Nov 2004 17:53:00 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Baltz",
"Edward A.",
""
],
[
"Hooper",
"Dan",
""
]
] | Kaluza-Klein dark matter particles can annihilate efficiently into electron-positron pairs, providing a discrete feature (a sharp edge) in the cosmic $e^+ e^-$ spectrum at an energy equal to the particle's mass (typically several hundred GeV to one TeV). Although this feature is probably beyond the reach of satellite or balloon-based cosmic ray experiments (those that distinguish the charge and mass of the primary particle), gamma ray telescopes may provide an alternative detection method. Designed to observe very high-energy gamma-rays, ACTs also observe the diffuse flux of electron-induced electromagnetic showers. The GLAST satellite, designed for gamma ray astronomy, will also observe any high energy showers (several hundred GeV and above) in its calorimeter. We show that high-significance detections of an electron-positron feature from Kaluza-Klein dark matter annihilations are possible with GLAST, and also with ACTs such as HESS, VERITAS or MAGIC. |
0805.4267 | Jan Nemchik | J. Nemchik (IEP SAS, Kosice & CTU, FNSPE, Prague), V. Petracek (CTU,
FNSPE, Prague), I.K. Potashnikova (Santa Maria U., Valparaiso & Dubna, JINR),
M. Sumbera (NPI, Rez) | Study of Nuclear Suppression at Large Forward Rapidities in d-Au
Collisions at Relativistic and Ultrarelativistic Energies | Revised version (6 pages, 4 figures) to appear in Physical Review C | Phys.Rev.C78:025213,2008 | 10.1103/PhysRevC.78.025213 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a strong suppression of the relative production rate (d-Au)/(p-p)
for inclusive high-pT hadrons of different species at large forward rapidities
(large Feynman xF). The model predictions calculated in the light-cone dipole
approach are in a good agreement with the recent measurements by the BRAHMS and
STAR Collaborations at the BNL Relativistic Heavy Ion Collider. We predict a
similar suppression at large pT and large xF also at lower energies, where no
effect of coherence is possible. It allows to exclude the saturation models or
the models based on Color Glass Condensate from interpretation of nuclear
effects.
| [
{
"created": "Wed, 28 May 2008 06:47:15 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jul 2008 06:43:39 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Aug 2008 06:42:56 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Nemchik",
"J.",
"",
"IEP SAS, Kosice & CTU, FNSPE, Prague"
],
[
"Petracek",
"V.",
"",
"CTU,\n FNSPE, Prague"
],
[
"Potashnikova",
"I. K.",
"",
"Santa Maria U., Valparaiso & Dubna, JINR"
],
[
"Sumbera",
"M.",
"",
"NPI, Rez"
]
] | We study a strong suppression of the relative production rate (d-Au)/(p-p) for inclusive high-pT hadrons of different species at large forward rapidities (large Feynman xF). The model predictions calculated in the light-cone dipole approach are in a good agreement with the recent measurements by the BRAHMS and STAR Collaborations at the BNL Relativistic Heavy Ion Collider. We predict a similar suppression at large pT and large xF also at lower energies, where no effect of coherence is possible. It allows to exclude the saturation models or the models based on Color Glass Condensate from interpretation of nuclear effects. |
hep-ph/9909406 | Alaa Abd El-Hady | A. Abd El-Hady, J. H. Mu\~noz, J.P. Vary | Semileptonic and non-leptonic B_c decays | 11 Pages, 1 Postscript figure | Phys.Rev.D62:014019,2000 | 10.1103/PhysRevD.62.014019 | ISU-NP-99-08, IITAP-99-010 | hep-ph | null | We make predictions for the exclusive semileptonic and the non-leptonic decay
widths of the B_c meson. We evaluate the B_c semileptonic form factors for
different decay channels in a relativistic model, and use factorization to
obtain the non-leptonic decay widths.
| [
{
"created": "Thu, 16 Sep 1999 19:50:04 GMT",
"version": "v1"
}
] | 2011-07-18 | [
[
"El-Hady",
"A. Abd",
""
],
[
"Muñoz",
"J. H.",
""
],
[
"Vary",
"J. P.",
""
]
] | We make predictions for the exclusive semileptonic and the non-leptonic decay widths of the B_c meson. We evaluate the B_c semileptonic form factors for different decay channels in a relativistic model, and use factorization to obtain the non-leptonic decay widths. |
1007.4328 | German Rodrigo | German Rodrigo and Paola Ferrario | Charge asymmetry: a theory appraisal | Presented at 3rd International Workshop on Top Quark Physics (TOP
2010), Bruges, Belgium, 31 May - 4 Jun 2010. 8 pages | Nuovo Cim.C33:04,2010 | 10.1393/ncc/i2010-10646-5 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most recent measurements at Tevatron of the charge asymmetry in
top-antitop quark pair production reduce the discrepancy with the Standard
Model from 2sigma to 1.7sigma, and open a little window, at 95% C.L., for
negative contributions to the charge asymmetry beyond the SM. We update our
analysis for colour octet gauge bosons or axigluons in flavour universal and
flavour non universal scenarios. We review other possible models and make an
educated guess on their parameter space allowed by the new measurements.
Finally, we comment on the prospects to measure the charge asymmetry at the
LHC.
| [
{
"created": "Sun, 25 Jul 2010 16:02:29 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Rodrigo",
"German",
""
],
[
"Ferrario",
"Paola",
""
]
] | The most recent measurements at Tevatron of the charge asymmetry in top-antitop quark pair production reduce the discrepancy with the Standard Model from 2sigma to 1.7sigma, and open a little window, at 95% C.L., for negative contributions to the charge asymmetry beyond the SM. We update our analysis for colour octet gauge bosons or axigluons in flavour universal and flavour non universal scenarios. We review other possible models and make an educated guess on their parameter space allowed by the new measurements. Finally, we comment on the prospects to measure the charge asymmetry at the LHC. |
2012.09813 | Lu Meng | Lu Meng, Bo Wang and Shi-Lin Zhu | Predicting the $\bar{D}_s^{(*)} D_s^{(*)}$ bound states as the partners
of $X(3872)$ | 9 pages, 5 figures; add the coupled-channel discussions in EFT; to be
published in Science Bulletin | Sci.Bull. 66 (2021) 1288-1295 | 10.1016/j.scib.2021.03.016 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the SU(3) flavor symmetry, heavy quark spin
symmetry and their breaking effects in the di-meson systems. We prove the
existence of the $[\bar{D}_{s}^{*}D_{s}^{*}]^{0^{++}}$,
$[\bar{D}_{s}^{*}D_{s}/\bar{D}_{s}^{}D_{s}^*]^{1^{+-}}$, and
$[\bar{D}_{s}^{*}D_{s}^{*}]^{1^{+-}}$ bound states as the consequence of two
prerequisites in the SU(3) flavor symmetry and heavy quark spin symmetry. The
first prerequisite, the $X(3872)$ as the weakly $\bar{D}^{*}D/\bar{D} D^{*}$
bound state is supported by its mass and decay branching ratios. The second
prerequisite, the existence of the $[\bar{D}_{s}D_{s}]^{0^{++}}$ bound state is
supported by the lattice QCD calculation [arXiv:2011.02542(hep-lat)] and the
observation of $\chi_{c0}(3930)$ by the LHCb
Collaboration[Phys.Rev.Lett.125,242001, Phys.Rev.D102,112003]. We hope the
future experimental analyses can search for these bound states in the $B\to
D_{(s)}^{(*)}\bar{D}^{(*)}_{(s)}h$ processes ($h$ denotes the light hadrons).
The $[\bar{D}_{s}^{*}D_{s}^{*}]^{0^{++}}$ bound state is also expected to be
reconstructed in the $J/\psi \phi$ final state in the $B\to J/\psi \phi K$
decay.
| [
{
"created": "Thu, 17 Dec 2020 18:29:08 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2020 10:25:53 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Mar 2021 19:29:46 GMT",
"version": "v3"
}
] | 2021-07-02 | [
[
"Meng",
"Lu",
""
],
[
"Wang",
"Bo",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | In this work, we investigate the SU(3) flavor symmetry, heavy quark spin symmetry and their breaking effects in the di-meson systems. We prove the existence of the $[\bar{D}_{s}^{*}D_{s}^{*}]^{0^{++}}$, $[\bar{D}_{s}^{*}D_{s}/\bar{D}_{s}^{}D_{s}^*]^{1^{+-}}$, and $[\bar{D}_{s}^{*}D_{s}^{*}]^{1^{+-}}$ bound states as the consequence of two prerequisites in the SU(3) flavor symmetry and heavy quark spin symmetry. The first prerequisite, the $X(3872)$ as the weakly $\bar{D}^{*}D/\bar{D} D^{*}$ bound state is supported by its mass and decay branching ratios. The second prerequisite, the existence of the $[\bar{D}_{s}D_{s}]^{0^{++}}$ bound state is supported by the lattice QCD calculation [arXiv:2011.02542(hep-lat)] and the observation of $\chi_{c0}(3930)$ by the LHCb Collaboration[Phys.Rev.Lett.125,242001, Phys.Rev.D102,112003]. We hope the future experimental analyses can search for these bound states in the $B\to D_{(s)}^{(*)}\bar{D}^{(*)}_{(s)}h$ processes ($h$ denotes the light hadrons). The $[\bar{D}_{s}^{*}D_{s}^{*}]^{0^{++}}$ bound state is also expected to be reconstructed in the $J/\psi \phi$ final state in the $B\to J/\psi \phi K$ decay. |
1403.7415 | Gustavo A. Contrera | Gustavo A. Contrera, William Spinella, Milva Orsaria and Fridolin
Weber | Hadron-Quark Phase Transition in Quark-Hybrid Stars | 7 pages, 2 figures. Contribution to VI International Workshop on
Astronomy and Relativistic Astrophysics (IWARA 2013) | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent discovery of the two-solar mass neutron stars $J1614-2230~(1.97
\pm 0.04 M_{\odot})$ and $J0348+0432~(2.01 \pm 0.04 M_{\odot})$ allows to
consider the possible existence of deconfined quarks in the cores of neutron
stars. Based on a non-local extension of the $SU(3)$ Nambu Jona-Lasinio model
with vector interactions to describe the quark matter phase, and a non-linear
Walecka model to represent the hadronic phase, a phase transition between these
two phases can be constructed via the Gibbs conditions and imposing global
electric charge neutrality condition. Depending on the strength of quark vector
repulsion, we find that an extended region made of a mixed phase of quarks and
hadrons may exist in high-mass neutron stars with masses up to $2.0-2.4
M_{\odot}$. The radii of these objects are between $12$ and $13$ km, as
expected for neutron stars.
| [
{
"created": "Fri, 28 Mar 2014 15:17:51 GMT",
"version": "v1"
}
] | 2014-03-31 | [
[
"Contrera",
"Gustavo A.",
""
],
[
"Spinella",
"William",
""
],
[
"Orsaria",
"Milva",
""
],
[
"Weber",
"Fridolin",
""
]
] | The recent discovery of the two-solar mass neutron stars $J1614-2230~(1.97 \pm 0.04 M_{\odot})$ and $J0348+0432~(2.01 \pm 0.04 M_{\odot})$ allows to consider the possible existence of deconfined quarks in the cores of neutron stars. Based on a non-local extension of the $SU(3)$ Nambu Jona-Lasinio model with vector interactions to describe the quark matter phase, and a non-linear Walecka model to represent the hadronic phase, a phase transition between these two phases can be constructed via the Gibbs conditions and imposing global electric charge neutrality condition. Depending on the strength of quark vector repulsion, we find that an extended region made of a mixed phase of quarks and hadrons may exist in high-mass neutron stars with masses up to $2.0-2.4 M_{\odot}$. The radii of these objects are between $12$ and $13$ km, as expected for neutron stars. |
2006.09443 | Artem Lipatov | S.J. Brodsky, G.I. Lykasov, A.V. Lipatov, J. Smiesko | Novel Heavy-Quark Physics Phenomena | 80 pages, 32 figures. review article | null | null | SLAC-PUB-17538 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the current understanding of heavy quark parton distributions in
nucleons and their impact on deep inelastic scattering, collider physics, and
other processes at high energies. The determination of the heavy-quark parton
distribution functions is particularly significant for the analysis of hard
processes at LHC energies, including the forward rapidity high $x_\mathrm{F}$
domain. The contribution of "intrinsic" heavy quarks, which are multiply
connected to the valence quarks of nucleons, is reviewed within
non-perturbative physics which provides new information on the fundamental
structure of hadrons in QCD. A new prediction for the non-perturbative
intrinsic charm-anticharm asymmetry of the proton eigenstate has recently been
obtained from a QCD lattice gauge theory calculation of the proton's
$G_\mathrm{E}^p(Q^2)$ form factor. This form factor only arises from
non-valence quarks and anti-quarks if they have different contributions in the
proton's eigenstate. This result, together with the exclusive and inclusive
connection and analytic constraints on the form of hadronic structure functions
from Light-Front Holographic QCD (LFHQCD) predicts a significant
non-perturbative $c(x,Q) - \bar{c}(x,Q)$ asymmetry in the proton structure
function at high $x$, consistent with the dynamics predicted by intrinsic charm
models. Recent ATLAS data on the associated production of prompt photons and
charm-quark jets in $pp$ collisions at $\sqrt{s} = 8$ TeV has provided new
constraints on non-perturbative intrinsic charm and tests of the LGTH
predictions. We also focus on other experimental observables which have high
sensitivity to the intrinsic heavy contributions to PDFs.
| [
{
"created": "Tue, 16 Jun 2020 18:39:48 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jun 2020 08:45:55 GMT",
"version": "v2"
}
] | 2020-06-30 | [
[
"Brodsky",
"S. J.",
""
],
[
"Lykasov",
"G. I.",
""
],
[
"Lipatov",
"A. V.",
""
],
[
"Smiesko",
"J.",
""
]
] | We review the current understanding of heavy quark parton distributions in nucleons and their impact on deep inelastic scattering, collider physics, and other processes at high energies. The determination of the heavy-quark parton distribution functions is particularly significant for the analysis of hard processes at LHC energies, including the forward rapidity high $x_\mathrm{F}$ domain. The contribution of "intrinsic" heavy quarks, which are multiply connected to the valence quarks of nucleons, is reviewed within non-perturbative physics which provides new information on the fundamental structure of hadrons in QCD. A new prediction for the non-perturbative intrinsic charm-anticharm asymmetry of the proton eigenstate has recently been obtained from a QCD lattice gauge theory calculation of the proton's $G_\mathrm{E}^p(Q^2)$ form factor. This form factor only arises from non-valence quarks and anti-quarks if they have different contributions in the proton's eigenstate. This result, together with the exclusive and inclusive connection and analytic constraints on the form of hadronic structure functions from Light-Front Holographic QCD (LFHQCD) predicts a significant non-perturbative $c(x,Q) - \bar{c}(x,Q)$ asymmetry in the proton structure function at high $x$, consistent with the dynamics predicted by intrinsic charm models. Recent ATLAS data on the associated production of prompt photons and charm-quark jets in $pp$ collisions at $\sqrt{s} = 8$ TeV has provided new constraints on non-perturbative intrinsic charm and tests of the LGTH predictions. We also focus on other experimental observables which have high sensitivity to the intrinsic heavy contributions to PDFs. |
2306.04002 | Ahmad Moursy ElSayed | Anish Ghoshal, Ahmad Moursy and Qaisar Shafi | Cosmological probes of Grand Unification: Primordial Blackholes &
scalar-induced Gravitational Waves | In the revised version any inadvertent text overlap with other papers
has been removed, the appendix is removed, and previous sections 5 and 6 have
been merged. All results including figures and conclusions remain intact | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the inflationary cosmology involving an SU(5) GUT (grand
unified theory) singlet scalar with non-minimal coupling to the Ricci scalar.
In this scenario the scale of grand unification is set by the inflaton vev when
the inflaton rolls down its potential towards its minimum $v$, thereby relating
inflationary dynamics to GUT symmetry breaking with a prediction $r \simeq
0.025$ for the tensor-to-scalar ratio to be tested by the next generation CMB
experiments. We show in this inflationary framework involving inflection-point
how a suitable choice of parameters in $SU(5)$ leads to a bump in the scalar
power spectrum with production of Primordial Blackholes (PBH) of masses
$10^{17}-10^{18}$g ($ 10 - 100 M_\odot$). We derive the constraints on the self
quartic and mixed quartic couplings of the inflaton in SU(5) that are
consistent with the inflationary analysis. Moreover, we also show that this
scenario leads to large amplitude induced second-order tensor perturbations
propagating as Gravitational Waves (GW) with amplitude $\Omega_{\rm GW}h^2 \sim
10^{-17}$ and peak frequency $f_{\rm peak} \sim$ (0.1 - 1) Hz, which can be
detected in the next generation GW observatories like LISA, BBO, ET, etc. Thus,
we unify the $SU(5)$ framework with PBH via inflection-point inflation showing
how the upcoming measurements of PBH and GW will enable us to probe the scale
of $SU(5)$ symmetry breaking, and thereby complementing the laboratory based
experiments. We also discuss scenarios involving the Pati-Salam and
Trinification gauge groups and its impact on quartic and mixed-quartic
couplings that may lead to PBH and detectable GW signals.
| [
{
"created": "Tue, 6 Jun 2023 20:29:19 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2023 15:33:15 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Ghoshal",
"Anish",
""
],
[
"Moursy",
"Ahmad",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We investigate the inflationary cosmology involving an SU(5) GUT (grand unified theory) singlet scalar with non-minimal coupling to the Ricci scalar. In this scenario the scale of grand unification is set by the inflaton vev when the inflaton rolls down its potential towards its minimum $v$, thereby relating inflationary dynamics to GUT symmetry breaking with a prediction $r \simeq 0.025$ for the tensor-to-scalar ratio to be tested by the next generation CMB experiments. We show in this inflationary framework involving inflection-point how a suitable choice of parameters in $SU(5)$ leads to a bump in the scalar power spectrum with production of Primordial Blackholes (PBH) of masses $10^{17}-10^{18}$g ($ 10 - 100 M_\odot$). We derive the constraints on the self quartic and mixed quartic couplings of the inflaton in SU(5) that are consistent with the inflationary analysis. Moreover, we also show that this scenario leads to large amplitude induced second-order tensor perturbations propagating as Gravitational Waves (GW) with amplitude $\Omega_{\rm GW}h^2 \sim 10^{-17}$ and peak frequency $f_{\rm peak} \sim$ (0.1 - 1) Hz, which can be detected in the next generation GW observatories like LISA, BBO, ET, etc. Thus, we unify the $SU(5)$ framework with PBH via inflection-point inflation showing how the upcoming measurements of PBH and GW will enable us to probe the scale of $SU(5)$ symmetry breaking, and thereby complementing the laboratory based experiments. We also discuss scenarios involving the Pati-Salam and Trinification gauge groups and its impact on quartic and mixed-quartic couplings that may lead to PBH and detectable GW signals. |
0710.3346 | Stefan Hesselbach | David Eriksson, Stefan Hesselbach, Johan Rathsman | Associated charged Higgs and W boson production in the MSSM at the LHC | Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 7 eps figures | null | null | SHEP-07-42 | hep-ph | null | We investigate the associated production of charged Higgs bosons (H^\pm) and
W bosons at the CERN Large Hadron Collider, using the leptonic decay H^+ ->
tau^+ nu_tau and hadronic W decay, within different scenarios of the Minimal
Supersymmetric Standard Model (MSSM) with both real and complex parameters.
Performing a parton level study we show how the irreducible Standard Model
background from W + 2 jets can be controlled by applying appropriate cuts. In
the standard m_h^max scenario we find a viable signal for large tan beta and
intermediate H^\pm masses (~ m_t). In MSSM scenarios with large mass-splittings
among the heavy Higgs bosons the cross-section can be resonantly enhanced by
factors up to one hundred, with a strong dependence on the CP-violating phases.
| [
{
"created": "Wed, 17 Oct 2007 16:29:11 GMT",
"version": "v1"
}
] | 2007-10-18 | [
[
"Eriksson",
"David",
""
],
[
"Hesselbach",
"Stefan",
""
],
[
"Rathsman",
"Johan",
""
]
] | We investigate the associated production of charged Higgs bosons (H^\pm) and W bosons at the CERN Large Hadron Collider, using the leptonic decay H^+ -> tau^+ nu_tau and hadronic W decay, within different scenarios of the Minimal Supersymmetric Standard Model (MSSM) with both real and complex parameters. Performing a parton level study we show how the irreducible Standard Model background from W + 2 jets can be controlled by applying appropriate cuts. In the standard m_h^max scenario we find a viable signal for large tan beta and intermediate H^\pm masses (~ m_t). In MSSM scenarios with large mass-splittings among the heavy Higgs bosons the cross-section can be resonantly enhanced by factors up to one hundred, with a strong dependence on the CP-violating phases. |
1011.5342 | Guido Altarelli | Guido Altarelli | Status of Neutrino Masses and Mixing in 2010 | 15 pages, 2 figures. Talk given at the Quarks, Strings and the Cosmos
- Hector Rubinstein Memorial Symposium, August 09-11, 2010, AlbaNova,
Stockholm, Sweden | null | null | RM3-TH/10-12, CERN-PH-TH/2010-280 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a short summary of our present knowledge and understanding of
neutrino masses and mixing.
| [
{
"created": "Wed, 24 Nov 2010 11:31:34 GMT",
"version": "v1"
}
] | 2010-11-25 | [
[
"Altarelli",
"Guido",
""
]
] | We present a short summary of our present knowledge and understanding of neutrino masses and mixing. |
hep-ph/0104208 | Massimo Di Pierro | Massimo Di Pierro and Estia Eichten | Excited Heavy-Light Systems and Hadronic Transitions | 41 pages (figures included) | Phys.Rev. D64 (2001) 114004 | 10.1103/PhysRevD.64.114004 | Fermilab Pub-01/033-T | hep-ph hep-ex hep-lat | null | A detailed study of orbital and radial excited states in D, Ds, B and B_s
systems is performed. The chiral quark model provides the framework for the
calculation of pseudoscalar meson (pi, K, ...) hadronic transitions among
heavy-light excited and ground states. To calculate the excited states masses
and wavefunctions, we must resort to a relativistic quark model. Our model
includes the leading order corrections in 1/m_(c,b) (e.g. mixing). Numerical
results for masses and light hadronic transition rates are compared to existing
experimental data. The effective coupling of the chiral quark model can be
determined by comparing with independent results from lattice simulations
(g^8_A = 0.53 +-/- 0.11) or fitting to known widths (g^8_A = 0.82 +-/- 0.09).
| [
{
"created": "Fri, 20 Apr 2001 19:20:28 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Apr 2001 15:28:41 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Aug 2001 21:21:20 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Di Pierro",
"Massimo",
""
],
[
"Eichten",
"Estia",
""
]
] | A detailed study of orbital and radial excited states in D, Ds, B and B_s systems is performed. The chiral quark model provides the framework for the calculation of pseudoscalar meson (pi, K, ...) hadronic transitions among heavy-light excited and ground states. To calculate the excited states masses and wavefunctions, we must resort to a relativistic quark model. Our model includes the leading order corrections in 1/m_(c,b) (e.g. mixing). Numerical results for masses and light hadronic transition rates are compared to existing experimental data. The effective coupling of the chiral quark model can be determined by comparing with independent results from lattice simulations (g^8_A = 0.53 +-/- 0.11) or fitting to known widths (g^8_A = 0.82 +-/- 0.09). |
hep-ph/0106219 | Scott Thomas | Steven B. Giddings and Scott Thomas | High Energy Colliders as Black Hole Factories: The End of Short Distance
Physics | Latex, 28 pages. v4: minor changes, largely to agree with published
version; appendix added comparing conventions | Phys.Rev. D65 (2002) 056010 | 10.1103/PhysRevD.65.056010 | null | hep-ph gr-qc hep-ex hep-th | null | If the fundamental Planck scale is of order a TeV, as the case in some
extra-dimensions scenarios, future hadron colliders such as the Large Hadron
Collider will be black hole factories. The non-perturbative process of black
hole formation and decay by Hawking evaporation gives rise to spectacular
events with up to many dozens of relatively hard jets and leptons, with a
characteristic ratio of hadronic to leptonic activity of roughly 5:1. The total
transverse energy of such events is typically a sizeable fraction of the beam
energy. Perturbative hard scattering processes at energies well above the
Planck scale are cloaked behind a horizon, thus limiting the ability to probe
short distances. The high energy black hole cross section grows with energy at
a rate determined by the dimensionality and geometry of the extra dimensions.
This dependence therefore probes the extra dimensions at distances larger than
the Planck scale.
| [
{
"created": "Tue, 19 Jun 2001 22:58:46 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2001 22:53:17 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Jun 2001 22:58:26 GMT",
"version": "v3"
},
{
"created": "Wed, 26 Jun 2002 02:27:54 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Giddings",
"Steven B.",
""
],
[
"Thomas",
"Scott",
""
]
] | If the fundamental Planck scale is of order a TeV, as the case in some extra-dimensions scenarios, future hadron colliders such as the Large Hadron Collider will be black hole factories. The non-perturbative process of black hole formation and decay by Hawking evaporation gives rise to spectacular events with up to many dozens of relatively hard jets and leptons, with a characteristic ratio of hadronic to leptonic activity of roughly 5:1. The total transverse energy of such events is typically a sizeable fraction of the beam energy. Perturbative hard scattering processes at energies well above the Planck scale are cloaked behind a horizon, thus limiting the ability to probe short distances. The high energy black hole cross section grows with energy at a rate determined by the dimensionality and geometry of the extra dimensions. This dependence therefore probes the extra dimensions at distances larger than the Planck scale. |
hep-ph/9808230 | Gaston Krein | D. Drechsel and G. Krein | The Gerasimov-Drell-Hearn sum rule and the single-pion photoproduction
multipole E0+ close to threshold | 9 pages, latex, 1 figure, to appear in Phys. Rev. D | Phys.Rev. D58 (1998) 116009 | 10.1103/PhysRevD.58.116009 | null | hep-ph nucl-ex nucl-th | null | The long-standing discrepancy between the Gerasimov-Drell-Hearn sum rule and
the analysis of pion photoproduction multipoles is greatly diminished by use of
s-wave multipoles that are in accord with the predictions of chiral
perturbation theory and describe the experimental data in the threshold region.
The remaining difference may be due to contributions of channels with more
pions and/or heavier mesons whose contributions to the sum rule remain to be
investigated by a direct measurement of the photoabsorption cross sections.
| [
{
"created": "Wed, 5 Aug 1998 09:28:31 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Drechsel",
"D.",
""
],
[
"Krein",
"G.",
""
]
] | The long-standing discrepancy between the Gerasimov-Drell-Hearn sum rule and the analysis of pion photoproduction multipoles is greatly diminished by use of s-wave multipoles that are in accord with the predictions of chiral perturbation theory and describe the experimental data in the threshold region. The remaining difference may be due to contributions of channels with more pions and/or heavier mesons whose contributions to the sum rule remain to be investigated by a direct measurement of the photoabsorption cross sections. |
2109.03248 | Taewook Youn | Can Kilic, Christopher B. Verhaaren and Taewook Youn | Twin Quark Dark Matter From Cogenesis | 32 pages, 11 figures; v3: Minor changes. Matches published version | null | 10.1103/PhysRevD.104.116018 | UTTG 16-2021 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the fraternal twin Higgs scenario to include a novel dark matter
candidate as well as a mechanism for generating a matter/antimatter asymmetry
in both sectors. A spontaneous breaking of twin color results in quark degrees
of freedom that are singlets under the residual twin color group. These
twin-color-singlet quarks, along with a subdominant component of twin leptons,
constitute the asymmetric dark matter. The asymmetry between matter in
antimatter in both sectors is co-generated from the decay of singlet fermions
that provide an additional portal between the visible and twin sectors. We
discuss the phenomenological aspects of this model, evaluating constraints on
the parameter space and highlighting promising discovery channels in future
experiments. We briefly discuss how the discovery of signals in multiple
experiments may help establish the connection between the mechanisms that
address the naturalness, dark matter and matter/antimatter asymmetry puzzles.
| [
{
"created": "Tue, 7 Sep 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Sep 2021 04:22:00 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Jan 2022 09:45:38 GMT",
"version": "v3"
}
] | 2022-01-07 | [
[
"Kilic",
"Can",
""
],
[
"Verhaaren",
"Christopher B.",
""
],
[
"Youn",
"Taewook",
""
]
] | We extend the fraternal twin Higgs scenario to include a novel dark matter candidate as well as a mechanism for generating a matter/antimatter asymmetry in both sectors. A spontaneous breaking of twin color results in quark degrees of freedom that are singlets under the residual twin color group. These twin-color-singlet quarks, along with a subdominant component of twin leptons, constitute the asymmetric dark matter. The asymmetry between matter in antimatter in both sectors is co-generated from the decay of singlet fermions that provide an additional portal between the visible and twin sectors. We discuss the phenomenological aspects of this model, evaluating constraints on the parameter space and highlighting promising discovery channels in future experiments. We briefly discuss how the discovery of signals in multiple experiments may help establish the connection between the mechanisms that address the naturalness, dark matter and matter/antimatter asymmetry puzzles. |
hep-ph/0401048 | Schweizer Julia | J. Schweizer (Bern University) | Decay widths and energy shifts of pi pi and pi K atoms | Version to be published in Phys. Lett. B. Four references added,
correlation matrix for pi K scattering lengths updated, uncertainty of Delta
E^h_1 in table 2 adapted. 14 pages, 1 figure | Phys.Lett. B587 (2004) 33-40 | 10.1016/j.physletb.2004.03.007 | null | hep-ph | null | We calculate the S-wave decay widths and energy shifts for pi pi and pi K
atoms in the framework of QCD+QED. The evaluation - valid at next-to-leading
order in isospin symmetry breaking - is performed within a non-relativistic
effective field theory. The results are of interest for future hadronic atom
experiments.
| [
{
"created": "Fri, 9 Jan 2004 13:02:28 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Mar 2004 09:20:19 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Schweizer",
"J.",
"",
"Bern University"
]
] | We calculate the S-wave decay widths and energy shifts for pi pi and pi K atoms in the framework of QCD+QED. The evaluation - valid at next-to-leading order in isospin symmetry breaking - is performed within a non-relativistic effective field theory. The results are of interest for future hadronic atom experiments. |
hep-ph/0203037 | Shoichi Ichinose | Shoichi Ichinose | CP-Violation in Kaluza-Klein and Randall-Sundrum Theories | 3 pages, 2 figures, Proceedings of the Fifth KEK Topical Conference
-Frontiers in Flavor Physics- | Nucl.Phys.Proc.Suppl. 111 (2002) 297-299 | 10.1016/S0920-5632(02)01727-9 | US-02-03 | hep-ph hep-th | null | The Kaluza-Klein theory and Randall-Sundrum theory are examined
comparatively, with focus on the five dimensional (Dirac) fermion and the
dimensional reduction to four dimensions. They are treated in the Cartan
formalism. The chiral property, localization, anomaly phenomena are examined.
The electric and magnetic dipole moment terms naturally appear. The order
estimation of the couplings is done. This is a possible origin of the
CP-violation.
| [
{
"created": "Tue, 5 Mar 2002 08:32:47 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ichinose",
"Shoichi",
""
]
] | The Kaluza-Klein theory and Randall-Sundrum theory are examined comparatively, with focus on the five dimensional (Dirac) fermion and the dimensional reduction to four dimensions. They are treated in the Cartan formalism. The chiral property, localization, anomaly phenomena are examined. The electric and magnetic dipole moment terms naturally appear. The order estimation of the couplings is done. This is a possible origin of the CP-violation. |
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