id large_stringlengths 9 16 | title large_stringlengths 1 382 | abstract large_stringlengths 3 6.09k | publish_date date32 | update_date date32 | categories large listlengths 1 13 | authors large_stringlengths 3 62.8k |
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hep-ph/9409335 | The Strange Quark Mass from QCD Sum Rules | The strange quark mass is calculated from QCD sum rules for the divergence of
the vector as well as axial-vector current in the next-next-to-leading
logarithmic approximation. The determination for the divergence of the
axial-vector current is found to be unreliable due to large uncertainties in
the hadronic parametris... | 1994-09-15 | 2008-11-26 | [
"hep-ph"
] | Matthias Jamin, Manfred M"unz |
hep-ph/9409320 | Vector boson pair production in e-e- collisions with polarized beams | The $W$-boson pair production in $e^-e^-$ collisions with polarized beams is
investigated. The helicity amplitudes are derived for general couplings and the
conditions for a good high-energy behaviour of the cross-section are given. The
results are applied to the heavy vector boson production in the context of the
left... | 1994-09-15 | 2009-10-28 | [
"hep-ph"
] | Paavo Helde, Katri Huitu, Jukka Maalampi and Martti Raidal |
hep-ph/9409319 | Is baryon number violated when electroweak strings intercommute? | We reexamine the self-helicity and the intercommutation of electroweak
strings. A plausible argument for baryon number conservation when electroweak
strings intercommute is presented. The connection between a segment of
electroweak strings and a sphaleron is also discussed. | 1994-09-15 | 2016-08-24 | [
"hep-ph",
"hep-th"
] | Hoi-Kwong Lo |
hep-ph/9409334 | $Z$ POLARIZATION IN $pp\rightarrow ZZ\rightarrow \ell^+\ell^-\nu
\bar{\nu}$ AT THE LHC | We evaluate the feasibility of measuring the $Z$ polarization from a heavy
Higgs signal in the decay channel $H\rightarrow ZZ \rightarrow \ell^+
\ell^-\nu\bar{\nu}$. Including gluon fusion production of the Higgs, continuum
production of $Z$ pairs and the QCD background of single $Z$ production with a
missing jet, we f... | 1994-09-15 | 2009-09-25 | [
"hep-ph"
] | M. J. Duncan and M. H. Reno |
hep-ph/9409313 | Extraction of $V_{ub}$ from the Decay $B\to \pi l \nu$ | We develop the perturbative QCD formalism including Sudakov effects for
semi-leptonic $B$ meson decays. We evaluate the differential decay rate of
$B\to \pi l \nu$, and find that the perturbative calculation is reliable for
the energy fraction of the pion above 0.3. Combining predictions from the soft
pion theorems, we... | 1994-09-15 | 2010-11-01 | [
"hep-ph"
] | Hsiang-nan Li and Hoi-Lai Yu |
hep-ph/9409322 | Order $\alpha^4 (m/M) R_{\infty}$ corrections to hydrogen P levels | The order $\alpha^4 (m/M) R_{\infty}$ shift of hydrogen P levels is found.
The corrections are predominantly of relativistic origin. Our approach is a
straightforward extension of that developed and applied by us previously to
positronium P levels. The corrections to the Lamb shift in hydrogen constitute
numerically \d... | 1994-09-15 | 2007-05-23 | [
"hep-ph"
] | E.A. Golosov, I.B. Khriplovich, A.I. Milstein and A.S. Yelkhovsky |
hep-ph/9409325 | Symmetry Tests and Standard Model Backgrounds | Symmetry tests provide an important probe for the structure of elementary
particle interactions and for the validity of the standard model. However, it
is pointed out that in the interpretation of such experiments one must keep in
mind that in many cases apparent "violations" of such tests are actually the
result of or... | 1994-09-15 | 2011-04-15 | [
"hep-ph",
"nucl-th"
] | Barry R. Holstein |
hep-ph/9409328 | Summary of Heavy Ion Theory | Can we study hot QCD using nuclear collisions? Can we learn about metallic
hydrogen from the impact of comet Shoemaker-Levy 9 on Jupiter? The answer to
both questions may surprise you! I summarize progress in relativistic heavy ion
theory reported at DPF `94 in the parallel sessions. | 1994-09-15 | 2008-02-03 | [
"hep-ph",
"nucl-th"
] | Sean Gavin (Brookhaven National Laboratory) |
hep-ph/9409326 | EXCALIBUR -- a Monte Carlo program to evaluate all four fermion
processes at LEP 200 and beyond | A Monte Carlo program is presented that computes all four fermion processes
in $e^+ e^-$ annihilation. QED initial state corrections and QCD contributions
are included. Fermions are taken to be massless, allowing a very fast
evaluation of the matrix element. A systematic, modular and self-optimizing
strategy has been a... | 1994-09-15 | 2009-10-28 | [
"hep-ph"
] | F. Berends, R, Kleiss and R. Pittau |
hep-ph/9409318 | Isolating the Penguin-diagram Contribution to $CP$ Violation in
$B^{0}_{d}$ vs $\bar{B}^{0}_{d}\rightarrow \pi^{+}\pi^{-}$ | A reliable prediction for $CP$ violation in $B^{0}_{d}$ vs
$\bar{B}^{0}_{d}\rightarrow \pi^{+}\pi^{-}$ suffers from the penguin-diagram
induced uncertainty. With the help of SU(3) relations, we show that both the
magnitude and strong phase shift of the penguin amplitude can be approximately
determined only from the bra... | 1994-09-15 | 2010-11-01 | [
"hep-ph"
] | Zhi-zhong Xing |
hep-ph/9409332 | Higgs signals modified by singlet scalars | The influence of massless scalar singlets on Higgs signals is discussed. It
is shown, that in the case of strong interactions between the Higgs boson and
the singlet fields, signals could be suppressed in such a way, that detection
of the Higgs boson becomes impossible. | 1994-09-15 | 2008-02-03 | [
"hep-ph",
"hep-th",
"nucl-th"
] | T. Binoth and J.J. van der Bij |
hep-ph/9409311 | Low x phenomena | We review recent developments in the application of perturbative QCD to
phenomena at small x. | 1994-09-14 | 2009-09-25 | [
"hep-ph"
] | A.D. Martin (Department of Physics, University of Durham) |
hep-ph/9409312 | Summary of Top Quark Physics | I briefly review standard top quark physics at hadron colliders and summarize
the contributions to this conference. The possibility of new mechanisms for
$t\bar{t}$ production are also discussed. | 1994-09-14 | 2007-05-23 | [
"hep-ph"
] | Stephen Parke |
hep-ph/9409314 | ${\cal O}(\alpha\as \ln m_t^2)$ Non-Universal Corrections to the Decay
Rate $\Gamma(Z\rightarrow b\bar{b})$ | The partial decay rate $\Gamma(Z\to b\bar{b})$ is significantly influenced by
the mass of the top quark due to electroweak radiative corrections. The leading
$\sim m_t^2$ and the next-to-leading contribution $\sim \ln m_t^2$ are known to
be numerically of similar size. In this work we calculate the QCD corrections
to t... | 1994-09-14 | 2011-04-20 | [
"hep-ph"
] | A. Kwiatkowski, M. Steinhauser |
hep-ph/9409309 | QCD Factors a1 and a2 Beyond Leading Logarithms Versus Factorization in
Non-Leptonic Heavy Meson Decays | We calculate the QCD factors $a_1$ and $a_2$, entering the tests of
factorization in non-leptonic heavy meson decays, beyond the leading
logarithmic approximation in three renormalization schemes (NDR, HV, DRED). We
investigate their $\mu$--dependence and the renormalization scheme dependence.
We point out that $a_1$ f... | 1994-09-14 | 2009-10-28 | [
"hep-ph"
] | A.J. Buras |
hep-ph/9409307 | Chiral Anomaly Tests | For the gamma-pion interaction, the perturbative expansion of the effective
chiral Lagrangian (chi-PT) can be limited to terms quartic in momenta and
masses (O(p4)), or to higher order. The abnormal intrinsic parity (chiral
anomaly) component of the lagrangian leads to interesting predictions for the
processes pi0 ----... | 1994-09-14 | 2008-02-03 | [
"hep-ph",
"nucl-th"
] | Murray A. Moinester |
hep-ph/9409315 | Z -> b\bar{b} Versus Dynamical Electroweak Symmetry Breaking involving
the Top Quark | In models of dynamical electroweak symmetry breaking which sensitively
involve the third generation, such as top quark condensation, the effects of
the new dynamics can show up experimentally in Z->b\bar{b}. We compare the
sensitivity of Z->b\bar{b} and top quark production at the Tevatron to models
of the new physics.... | 1994-09-14 | 2011-07-18 | [
"hep-ph"
] | Christopher T. Hill and Xinmin Zhang |
hep-ph/9409310 | New Neutral Gauge Bosons and New Heavy Fermions in the Light of the New
LEP Data | We derive limits on a class of new physics effects that are naturally present
in grand unified theories based on extended gauge groups, and in particular in
$E_6$ and $SO(10)$ models. We concentrate on $i$) the effects of the mixing of
new neutral gauge bosons with the standard $Z_0$; $ii$) the effects of a mixing
of t... | 1994-09-14 | 2010-11-01 | [
"hep-ph"
] | Enrico Nardi, Esteban Roulet and Daniele Tommasini |
hep-ph/9409306 | Theoretical Uncertainties in the Extraction of $|V_{cb}|$ from $\bar
B\to D^*\ell\,\bar\nu$ Decays near Zero Recoil | I discuss the theoretical uncertainties in the extraction of $|\,V_{cb}|$
from a measurement of the $\bar B\to D^*\ell\,\bar\nu$ decay rate close to zero
recoil. In particular, I combine previous estimates of the $1/m_Q^2$
corrections to the normalization of the hadronic form factor at zero recoil
with sum rules derive... | 1994-09-14 | 2008-02-03 | [
"hep-ph"
] | Matthias Neubert |
hep-ph/9409308 | Effective Field Theory Approach to Parton-Hadron Conversion in High
Energy QCD Processes | A QCD based effective action is constructed to describe the dynamics of
confinement and symmetry breaking in the process of parton-hadron conversion.
The deconfined quark and gluon degrees of freedom of the perturbative QCD
vacuum are coupled to color singlet collective fields representing the
non-perturbative vacuum w... | 1994-09-14 | 2009-10-28 | [
"hep-ph"
] | K. Geiger |
hep-ph/9409299 | Proton spin content from skyrmions | It is well known that in lowest order the skyrmion model of the nucleon gives
vanishing spin content. With new data indicating a proton spin content
$\Delta\Sigma = 0.22\pm 0.14,$ it is an increasing challenge to find ways in
which the skyrmion can move away from the null result. We show here that a
particular term in ... | 1994-09-13 | 2011-07-19 | [
"hep-ph",
"nucl-th"
] | G. Kaelbermann, J.M. Eisenberg, Andreas Schaefer |
hep-ph/9409292 | Off-Shell Electromagnetic Form Fators of the Nucleon in Chiral
Perturbation Theory | We study the electromagnetic form factors of a nucleon in next-to-leading
order chiral perturbation theory (CPT) in the case where one of the nucleons is
off its mass shell. We calculate the leading nonanalytic contributions to
relevant measures for the off-shell dependence in the limited kinematical range
allowed. | 1994-09-13 | 2007-05-23 | [
"hep-ph",
"nucl-th"
] | J.W. Bos and J.H. Koch |
hep-ph/9409289 | FORTRAN program for a numerical solution of the nonsinglet
Altarelli-Parisi equation | We investigate a numerical solution of the flavor-nonsinglet Altarelli-Parisi
equation with next-to-leading-order $\alpha_s$ corrections by using Laguerre
polynomials. Expanding a structure function (or a quark distribution) and a
splitting function by the Laguerre polynomials, we reduce an
integrodifferential equation... | 1994-09-13 | 2014-11-17 | [
"hep-ph",
"nucl-th"
] | R. Kobayashi, M. Konuma, and S. Kumano (Department of Physics, Saga
University) |
hep-ph/9409287 | Perturbative Strong Interaction Corrections to the Heavy Quark
Semileptonic Decay Rate | We calculate the part of the order $\alpha_s^2$ correction to the
semileptonic heavy quark decay rate proportional to the number of light quark
flavors, and use our result to set the scale for evaluating the strong coupling
in the order $\alpha_s$ term according to the scheme of Brodsky, Lepage and
Mackenzie. Expressin... | 1994-09-13 | 2010-11-01 | [
"hep-ph"
] | Michael Luke, Martin J. Savage and Mark B. Wise |
hep-ph/9409295 | The Strongly Interacting Electroweak Phase Transition | A quantitative discussion of nonperturbative effects for the high temperature
electroweak phase transition is presented. We propose a method for the
computation of the temperature dependent effective scalar potential that takes
into account the running of the effective gauge coupling. Compared to
perturbation theory we... | 1994-09-13 | 2009-10-28 | [
"hep-ph"
] | B.Bergerhoff and C.Wetterich |
hep-ph/9409297 | Isospin Mass Splittings and the $\ms$ Corrections in the Semibosonized
SU(3)-NJL-Model | The mass splittings of hyperons including the isospin splittings are
calculated with $O(\ms^2)$ and $O(\ms \dm)$ accuracy respectively within the
semibosonized SU(3)-NJL model. The pattern of the isospin splittings is not
spoiled by the terms of the order $O(\ms \dm)$, and both splittings between the
different isospin ... | 1994-09-13 | 2007-05-23 | [
"hep-ph"
] | Andree Blotz, K. Goeke and M. Praszalowicz |
hep-ph/9409288 | Alpha_s from spectroscopy of psi- and Upsilon-particles in QCD sum rules | In a specific scheme of the QCD sum rules, one gives the estimate of
$\alpha_S\simeq 0.20$ from the data on the masses and leptonic constants of
$\psi$- and $\Upsilon$-particles. | 1994-09-13 | 2007-05-23 | [
"hep-ph"
] | V.V.Kiselev |
hep-ph/9409305 | Top-Production and Flavor Physics--The Talk | Because of the top quark's very large mass, about 175~GeV, it now provides
the best window into flavor physics. Thus, pair--production of top quarks at
the Tevatron Collider is the most incisive probe of this physics until the
Large Hadron Collider turns on in the next century. In this talk I discuss how
moments of the... | 1994-09-13 | 2007-05-23 | [
"hep-ph"
] | Kenneth Lane |
hep-ph/9409301 | Event Rates in Dark Matter Detectors For Neutralinos Including
Constraints From The $b\rightarrow s\gamma$ Decay | Event rates for dark matter detectors in neutralino--nucleus scattering are
studied for supergravity unified models, including the constraint arising from
the $b\rightarrow s\gamma$ experiment. The recent experimental measurement of
this decay by the CLEO Collaboration leads to strong constraints on the SUSY
particle s... | 1994-09-13 | 2009-09-25 | [
"hep-ph"
] | Pran Nath and R.Arnowitt |
hep-ph/9409296 | On the photoproduction of jets at HERA | We discuss the inclusive jet production at HERA in the next-to-leading
logarithm approximation. Theoretical uncertainties are considered in some
details. We show the importance of the jet rapidity distribution to constrain
the parton densities in the photon. A comparison is made with the recent H1
data. | 1994-09-13 | 2019-08-17 | [
"hep-ph"
] | P. Aurenche, M. Fontannaz, J.-Ph. Guillet |
hep-ph/9409298 | The $(0^+,1^+)$ heavy meson multiplet in an extended NJL model | In this letter we reconsider the previously given description of heavy mesons
within a bosonized extended NJL model that combines heavy quark and chiral
symmetry. In that work the naive gradient expansion of the quark determinant
was used, which satisfactorily works in the light sector but does not
adequately describe ... | 1994-09-13 | 2007-05-23 | [
"hep-ph"
] | D.Ebert, T.Feldmann, R.Friedrich, H.Reinhardt |
hep-ph/9409290 | Mixing-Induced CP Violation in the Decay $B_d\to K^0 \bar K^0$ within
the Standard Model | Recently, flavour $SU(3)$ symmetry of strong interactions has been combined
with certain dynamical assumptions to derive triangle relations among $B$-meson
decay-amplitudes. We show that these relations allow a prediction of the
mixing-induced CP asymmetry $\acpmi(B_d\to K^0\bar K^0)$. Contrary to
statements made in se... | 1994-09-13 | 2009-09-25 | [
"hep-ph"
] | R. Fleischer |
hep-ph/9409294 | The production of jets from quasi real photons in \epem collisions | We consider the production of jets in photon-photon collisions beyond the
leading logarithm approximation. Theoretical uncertainties as well as
uncertainties due to the virtuality of the initial photons are discussed in
detail. The comparison with TOPAZ data is performed and good agreement is found
between experiment a... | 1994-09-13 | 2009-09-25 | [
"hep-ph"
] | P. Aurenche, J.-Ph. Guillet M. Fontannaz Y. Shimizu, J. Fujimoto K.
Kato |
hep-ph/9409291 | Higgs Production and Decay via $e^+e^-\rightarrow Z^0 H^0 \rightarrow
b\bar bW^+W^-$ and Irreducible Backgrounds at the Next Linear Collider | The complete matrix element for $e^+e^-\ar b\bar bW^+W^-$ has been computed
at tree--level and applied to $Z^0H^0$ production followed by $Z^0\ar b\bar b$
and $H^0\ar W^+W^-$, keeping into account all irreducible backgrounds, which
are dominated by \ttb production, at the Next Linear Colliders. We find that,
depending ... | 1994-09-13 | 2009-10-28 | [
"hep-ph"
] | A. Ballestrero, E. Maina and S. Moretti |
hep-ph/9409302 | Scattering off an SO(10) cosmic string | The scattering of fermions from the abelian string arising during the phase
transition $SO(10) \rightarrow SU(5) \times Z_2$ induced by the Higgs in the
126 representation is studied. Elastic cross-sections and baryon number
violating cross-sections due to the coupling to gauge fields in the core of the
string are comp... | 1994-09-13 | 2009-10-28 | [
"hep-ph"
] | Anne-Christine DAVIS and Rachel JEANNEROT |
hep-ph/9409303 | Considerations Concerning the QCD Corrections to $\Delta\rho$ | Using recent results of Avdeev et al. and an expansion for $\mu_t/\mms$
($M_t$ is the pole mass and $\mu_t\equiv \hat{m_t}(\mu_t)$ ), it is shown that
when deltarho is expressed in terms of $\hat{m_t}^2(M_t)$, the QCD correction
is only $(2-3)\times 10^{-3}$ in the NLO approximation. As a consequence, in
terms of $M_t^... | 1994-09-13 | 2009-10-28 | [
"hep-ph"
] | Alberto Sirlin |
hep-ph/9409300 | Studying the Quark Antiquark Force with Inelastic Pion Electron
Scattering | The concept of studying the internal structure of mesons is explored. Mesons,
which are in principle two body quark antiquark interactions, may be much
easier to understand than the nucleon. Measurements of the inelastic form
factors to specific final states may permit careful direct studies of various
components of th... | 1994-09-13 | 2009-10-28 | [
"hep-ph"
] | J.M.LoSecco |
hep-ph/9409304 | Technicolor and Precision Tests of the Electroweak Interactions | Precision electroweak measurements have been claimed to eliminate almost all
models of technicolor. We show that the assumptions made to calculate the
oblique parameters $S$,$T$,$U$ apply to QCD--like technicolor models which were
ruled out long ago on much firmer grounds. These assumptions are invalid in
modern ``walk... | 1994-09-13 | 2007-05-23 | [
"hep-ph"
] | Kenneth Lane |
hep-ph/9409293 | $f_1$ Vector Meson Dominance Model for the Strange Axial Form Factor of
the Nucleon | The axial strange form factor $F^s_A$ of the nucleon is assumed to be
dominated at low momentum transfer by the isoscalar axial vector mesons
$f_1(1285)$ and $f_1(1420)$. The importance of the $a_0\pi N$-triangular vertex
correction is demonstrated. | 1994-09-13 | 2009-09-25 | [
"hep-ph"
] | M. Kirchbach and H. Arenhoevel |
hep-ph/9409286 | Radiative Corrections to Quarkonium Decays: From a Model to a Rigorous
Theory | Most previous calculations of the annihilation decay rates of heavy
quarkonium were based on factorization assumptions that were unproven and, in
some cases, even incorrect. The recent development of a general factorization
formula for heavy quarkonium annihilation rates has provided a rigorous
theoretical foundation f... | 1994-09-12 | 2007-05-23 | [
"hep-ph"
] | Eric Braaten |
hep-ph/9409279 | An angle representation of QCD | For the sake of eliminating gauge variant degrees of freedom we discuss the
way to introduce angular variables in the hamiltonian formulation of QCD. On
the basis of an analysis of Gauss' law constraints a particular choice is made
for the variable transformation from gauge fields to angular field variables.
The result... | 1994-09-12 | 2007-05-23 | [
"hep-ph"
] | Dieter Stoll |
hep-ph/9409284 | Semi-leptonic form-factors from lattice qcd | We present results for semi-leptonic form-factors obtained on a statistical
sample of $66$ $32^3 \times 64$ lattices at $\beta = 6.0$ using quenched Wilson
fermions. We find $f_+^{D \to K l \nu}(q^2 = 0) = 0.73 \pm 0.06$, $A_2/A_1({D
\to K^* l \nu}) = 0.72 \pm 0.22$, $V/A_1({D_s \to \phi l \nu}) = 1.91 \pm
0.04$, and $... | 1994-09-12 | 2007-05-23 | [
"hep-ph",
"hep-lat"
] | Tanmoy Bhattacharya and Rajan Gupta |
hep-ph/9409285 | Supersymmetric SO(10) Simplified | 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 aris... | 1994-09-12 | 2011-05-12 | [
"hep-ph"
] | K.S. Babu and S.M. Barr |
hep-ph/9409281 | Local and Nonlocal Defect-Mediated Electroweak Baryogenesis | We consider the effects of particle transport in the topological
defect-mediated electroweak baryogenesis scenarios of Ref. 1. We analyze the
cases of both thin and thick defects and demonstrate an enhancement of the
original mechanism in both cases due to an increased effective volume in which
baryogenesis occurs. Thi... | 1994-09-12 | 2010-11-01 | [
"hep-ph",
"astro-ph"
] | Robert Brandenberger, Anne-Christine Davis, Tomislav Prokopec and Mark
Trodden (Newton Institute, University of Cambridge) |
hep-ph/9409278 | The role of zero modes for the infrared behavior of QCD | We analyse the mechanism in which zero modes lead to an elimination of
fermionic color non--singlet states in 1+1 dimensions. Using a hamiltonian
lattice formulation we clarify the physical meaning of the zero modes but we do
not find support for speculations on the crucial importance of lower
dimensional fields (zero ... | 1994-09-12 | 2015-06-25 | [
"hep-ph"
] | Dieter Stoll, Soh Takeuchi and Koichi Yazaki |
hep-ph/9409277 | Light Flavor Dependence of the Isgur-Wise Function | We present an investigation on the ligh flavor dependence of the Isgur-Wise
function for $B_a\rightarrow D_a$ and $B_a\rightarrow D^{*}_a$ in the framework
of QCD sum rules. It is found that the Isgur-Wise function for $B_s$ decay
falls faster than that for $B_{u,d}$ decay , which is just contrary to the
recent predict... | 1994-09-12 | 2009-09-25 | [
"hep-ph"
] | Tao Huang and Chuan-Wang Luo |
hep-ph/9409283 | Possible Tests for $b \rightarrow s g$ Penguins via Inclusive $K$
Distributions and Exclusive Processes | We discuss experimental signatures capable of nearly immediate study that
would discern/constrain new physics manifested via enhanced gluonic penguin
decays of the $b$. | 1994-09-12 | 2011-07-19 | [
"hep-ph"
] | J. Milana and S. Nussinov |
hep-ph/9409282 | Additional Degrees of Freedom in Skyrmion Motion | We consider the quantization of chiral solitons with baryon number $B>1$.
Classical solitons are obtained within the framework of a variational approach.
From the form of the soliton solution it can be seen that besides the group of
symmetry describing transformations of the configuration as a whole there are
additiona... | 1994-09-12 | 2008-02-03 | [
"hep-ph"
] | I.V. Musatov, V.A. Nikolaev, E. Sorace, M. Tarlini and O.G. Tkachev |
hep-ph/9409280 | Fermion damping rate in a hot medium | In principle every excitation acquires a finite lifetime in a hot system.
This nonzero spectral width is calculated self-consistently for massive
fermions coupled to massless scalar, vector and pseudoscalar bosons. It is
shown that the self-consistent summation of the corresponding Fock diagram for
fermions eliminates ... | 1994-09-12 | 2008-02-03 | [
"hep-ph"
] | P.A.Henning, R.Sollacher, H.Weigert |
hep-ph/9409276 | Top Momentum and Extra Soft Jets | Top pairs produced at the Tevatron may be accompanied by extra jets due to
radiation of soft gluons. Whether these jets should be included in top momentum
reconstruction depends on the source of the gluons, which can be radiated off
the initial partons, the final state $b$ quarks, or the intermediate top
quarks. We com... | 1994-09-11 | 2007-05-23 | [
"hep-ph"
] | Lynne H. Orr and W.J. Stirling |
hep-ph/9409274 | Baryogenesis from Long Cosmic Strings | Based on the mechanism of cusp production on long cosmic strings, the baryon
asymmetry caused by cusp annihilation has been calculated. The result is
compatible with observation and stronger than the results from loops. | 1994-09-10 | 2009-10-28 | [
"hep-ph",
"astro-ph"
] | Masoud Mohazzab |
hep-ph/9409267 | Late-time Phase transition and the Galactic halo as a Bose Liquid: (II)
the Effect of Visible Matter | In the previous work, we investigated the rotation curves of galaxies
assuming that the dark matter consists of ultra light boson appearing in
$'$late time phase transition' theory. Generalizing this work, we consider the
effect of visible matter and classify the types of rotation curves as we vary
the fraction of the ... | 1994-09-10 | 2010-11-30 | [
"hep-ph"
] | S.U. Ji and S.J. Sin (Hanyang University) |
hep-ph/9409269 | Higher Order Corrections to the Equation of State of QED at High
Temperature | We elaborate on the computation of the pressure of thermal quantum
electrodynamics, with massless electrons, to the fifth ($e^5$) order. The
calculation is performed within the Feynman gauge and the imaginary-time
formalism is employed. For the $e^4$ calculation, the method of Sudakov
decomposition is used to evaluate ... | 1994-09-09 | 2009-10-28 | [
"hep-ph"
] | Rajesh Parwani (Saclay) and Claudio Coriano`(Argonne Natl. Lab.) |
hep-ph/9409268 | Hyperon in Chiral Effective Quark Models | Baryonic correlation functions are calculated within an effective chiral
quark model motivated by the instanton liquid model of QCD. Using a flavour
SU(3) symmetry for the local four-quark interaction and taking rotational zero
modes for the quantization into account low-energy hadronic observables are in
surprising ag... | 1994-09-09 | 2015-06-25 | [
"hep-ph"
] | A. Blotz, M. Praszalowicz, K.Goeke |
hep-ph/9409273 | Algebraic Reduction of Feynman Diagrams to Scalar Integrals: a
Mathematica implementation of LERG-I | A Mathematica implementation of the program LERG-I is presented that performs
the reduction of tensor integrals, encountered in one-loop Feynman diagram
calculations, to scalar integrals. The program was originally coded in REDUCE
and in that incarnation was applied to a number of problems of physical
interest. | 1994-09-09 | 2009-10-28 | [
"hep-ph"
] | Robin G. Stuart |
hep-ph/9409275 | A New Technique for Detecting Supersymmetric Dark Matter | We estimate the event rate for excitation of atomic transition by
photino-like dark matter. For excitations of several eV, this event rate can
exceed naive cross-section by many orders of magnitude. Although the event rate
for these atomic excitation is smaller than that of nuclear recoil off of
non-zero spin nuclei, t... | 1994-09-09 | 2009-10-28 | [
"hep-ph",
"astro-ph"
] | Glenn D. Starkman (CITA) and David N. Spergel (Princeton) |
hep-ph/9409271 | Instanton-induced production of jets with large transverse momentum in
QCD | We consider the instanton-induced cross section for production of a gluon jet
with large transverse momentum in QCD and point out that Mueller's corrections
corresponding to the rescattering of hard quanta are likely to remove
contributions of large instantons, making this cross section well defined. Some
speculations ... | 1994-09-09 | 2009-10-28 | [
"hep-ph"
] | I.I. Balitsky and V.M. Braun |
hep-ph/9409265 | Fusing Gauge Theory Tree Amplitudes Into Loop Amplitudes | We identify a large class of one-loop amplitudes for massless particles that
can be constructed via unitarity from tree amplitudes, without any ambiguities.
One-loop amplitudes for massless supersymmetric gauge theories fall into this
class; in addition, many non-supersymmetric amplitudes can be rearranged to
take adva... | 1994-09-09 | 2010-11-15 | [
"hep-ph",
"hep-th"
] | Z. Bern, L. Dixon, D.C. Dunbar and D.A. Kosower |
hep-ph/9409272 | Beta decay of hyperons in a relativistic quark model | A relativistic constituent quark model is used to calculate the semileptonic
beta decay of nucleons and hyperons. The parameters of the model, namely, the
constituent quark mass and the confinement scale, are fixed by a previous
calculation of the magnetic moments of the baryon octet within the same model.
We discuss t... | 1994-09-09 | 2011-08-17 | [
"hep-ph"
] | Felix Schlumpf |
hep-ph/9409270 | Heavy Sneutrinos as Dark Matter | We calculate the relic density of very heavy, stable scalar neutrinos in the
minimal supersymmetric standard model. We include all two-body final states, as
well as the effects of co-annihilation with scalar electrons. We find that the
sneutrino relic density is in the cosmologically interesting region
$0.1\ltwid\Omega... | 1994-09-09 | 2008-11-26 | [
"hep-ph"
] | Toby Falk, Keith A. Olive, and Mark Srednicki |
hep-ph/9409258 | Comments on QCD Corrections to $b \to s \gamma$ Decay | We find some errors in previous calculation of leading log QCD corrections to
$b \to s\gamma $ decay, which include corrections from $m_{top}$ to $M_W$ in
addition to corrections from $M_{W}$ to $m_b$. The inclusive decay rate is
found to be enhanced more than previous calculations. At $m_t=170$GeV, the
running from $m... | 1994-09-09 | 2016-08-14 | [
"hep-ph"
] | Cai-Dian L\"u, Jing-Liang Hu and Chong-Shou Gao |
hep-ph/9409266 | Heavy Polonyi Field as a Solution of the Polonyi Problem | We study properties of the Polonyi field in the renormalizable hidden sector
in supergravity models. It is shown that radiative corrections induce a sizable
coupling of the Polonyi field to gravitinos as well as raise its mass to an
intermediate scale. We find it serves a solution of the Polonyi problem and
show that t... | 1994-09-09 | 2009-10-28 | [
"hep-ph"
] | Izumi Joichi and Masahiro Yamaguchi |
hep-ph/9409250 | Hydrodynamic Transport Coefficients in Relativistic Scalar Field Theory | Hydrodynamic transport coefficients may be evaluated from first principles in
a weakly coupled scalar field theory at arbitrary temperature. In a theory with
cubic and quartic interactions, the infinite class of diagrams which contribute
to the leading weak coupling behavior are identified and summed. The resulting
exp... | 1994-09-08 | 2009-10-28 | [
"hep-ph"
] | Sangyong Jeon |
hep-ph/9409259 | \Omb \rightarrow \Omc , \Omc ^* $ transitions: Model-independent bounds
on invariant form factors | In this note we report some model-independent bounds involving transition
form factors for $ \Omb \rightarrow \Omc $ and $ \Omb \rightarrow \Omc ^* $ and
the nonperturbative matrix elements of the $ \Omb $ system. They are derived by
using operator product expansion (OPE) in Heavy Quark Effective Theory . | 1994-09-08 | 2016-08-14 | [
"hep-ph"
] | J.G.K\"orner, K.Melnikov, O.Yakovlev |
hep-ph/9409256 | Lambda-bar from QCD sum rules for heavy quarkonium | Using a specific scheme of the QCD sum rules for heavy quarkonium in the
leading approximation over the inverse heavy quark mass, one gets the estimate
of the difference between the masses of the heavy meson and heavy quark $\bar
\Lambda = 0.59\pm 0.02$ GeV. | 1994-09-08 | 2008-02-03 | [
"hep-ph"
] | V.V.Kiselev |
hep-ph/9409254 | Positivity Constraints for Spin-Dependent Parton Distributions | We derive new positivity constraints on the spin-dependent structure
functions of the nucleon. These model independent results reduce conside\-rably
their domain of allowed values, in particular for the chiral-odd parton
distribution $h_1 (x)$. | 1994-09-08 | 2010-11-01 | [
"hep-ph"
] | J. Soffer |
hep-ph/9409257 | MRS(1994): parton distributions of the proton | To obtain improved parton densities of the proton, we present a new global
analysis of deep-inelastic and related hard scattering data including, in
particular, the recent measurements of F2 at HERA, of the asymmetry of the
rapidity distributions of W+- production at the FNAL pbar p collider and of the
asymmetry in Dre... | 1994-09-08 | 2009-09-25 | [
"hep-ph"
] | A.D. Martin, R.G. Roberts, and W.J. Stirling |
hep-ph/9409262 | Electromagnetic Form Factors at Large Momentum Transfer | Recent improvements of the hard scattering picture for the large $p_{\perp}$
behaviour of electromagnetic form factors, namely the inclusion of both Sudakov
corrections and intrinsic transverse momentum dependence of the hadronic wave
function, are reviewed. On account of these improvements the perturbative
contributio... | 1994-09-08 | 2016-09-01 | [
"hep-ph"
] | P. Kroll |
hep-ph/9409263 | Extracting the Intermediate-Mass Higgs Resonance at Photon-Photon
Colliders | We address the problem of how to extract the signal of a Higgs within the
intermediate mass range at a photon-photon collider that has a wide energy
spectrum. All backgrounds from two-jets production are included: direct,
so-called resolved and twice-resolved as well as single $Z$ and $W$ production.
Uncertainties in t... | 1994-09-08 | 2009-10-28 | [
"hep-ph"
] | M.Baillargeon, G. Belanger and F. Boudjema |
hep-ph/9409260 | Unitarity Constraints for New Physics Induced by dim-6 Operators | We compute the helicity amplitudes for boson-boson scattering at high energy
due to the operators $\O_{B\Phi}$, $\O_{W\Phi}$ and $\O_{UB}$, and we derive
the corresponding unitarity bounds. Thus, we provide relations between the
couplings of these operators and the corresponding New Physics thresholds,
where either uni... | 1994-09-08 | 2009-10-28 | [
"hep-ph"
] | G.J. Gounaris, J.Layssac, J.E. Paschalis and F.M. Renard |
hep-ph/9409255 | $B_K$ and Explicit Chiral Symmetry Breaking | The $B_K$ parameter is discussed in the general context of calculating beyond
the factorization approximation for hadronic matrix elements. A variant of the
$1/N_c$ method of Bardeen et al. is used. We present calculations within a low
energy approach and a calculation within the Nambu--Jona-Lasinio model.
Matching wit... | 1994-09-08 | 2009-10-28 | [
"hep-ph"
] | Johan Bijnens and Joaquim Prades |
hep-ph/9409261 | Non-factorization and the Decays B into J/psi + K(*) | Many known models, which generally use a factorization hypothesis, give a
poor account of the decays B into J/psi + K(*). Usually there is a free overall
factor, which is fit to the data, so that tests of the models rely upon ratios.
The models tend to give too much K* compared to K and too much transverse
polarization... | 1994-09-08 | 2009-09-25 | [
"hep-ph"
] | Carl E. Carlson and J. Milana |
hep-ph/9409264 | Testing Supersymmetry at the Next Linear Collider | If new particles are discovered, it will be important to determine if they
are the supersymmetric partners of standard model bosons and fermions.
Supersymmetry predicts relations among the couplings and masses of these
particles. We discuss the prospects for testing these relations at a future
$e^+e^-$ linear collider ... | 1994-09-08 | 2007-05-23 | [
"hep-ph"
] | Jonathan L. Feng |
hep-ph/9409246 | Braaten-Pisarski Method at Finite Chemical Potential | The effective perturbation theory developed by Braaten and Pisarski for gauge
theories at finite temperature is extended to finite chemical potential. As a
first application the collisional energy loss of a heavy quark propagating
through a quark-gluon plasma with non-vanishing quark chemical potential is
considered. A... | 1994-09-07 | 2009-10-28 | [
"hep-ph"
] | Hans Vija and Markus H. Thoma |
hep-ph/9409248 | About Entropy and Thermalization - a Miniworkshop Perspective | We present a summary and perspective view of the Miniworkshop on ``{\it
Entropy and Thermalization}'' in strong interactions (convener J. Rafelski),
which was part of the NATO Advanced Research Workshop on ``{\it Hot Hadronic
Matter}'' that took place in Divonne, 27 June to 1 July 1994. To appear in the
Proceedings (Pl... | 1994-09-07 | 2008-02-03 | [
"hep-ph",
"adap-org",
"nlin.AO",
"nucl-th"
] | Hans-Thomas Elze and Peter A. Carruthers |
hep-ph/9409244 | Limitations in Measuring the Angle $\beta$ by Using $SU(3)$ Relations
for $B$-Meson Decay-Amplitudes | Flavour $SU(3)$ symmetry of strong interactions and certain dynamical
assumptions have been used in a series of recent publications to extract weak
CKM phases from $B$-decays into $\{\pi\pi,\pi K, K\bar K\}$ final states. We
point out that irrespectively of $SU(3)$-breaking effects the presence of
QCD-penguin contribut... | 1994-09-07 | 2010-11-01 | [
"hep-ph"
] | A.J. Buras and R. Fleischer |
hep-ph/9409247 | Theory of Semi-- and Nonleptonic Decays of Heavy Mesons | I review some of the recent developments in the theoretical description of
weak inclusive decays of heavy mesons. The topics cover the value of $|V_{cb}|$
as extracted from semileptonic inclusive decays and a short discussion of the
theoretical errors. I also present the results of a recent calculation of
next--to--lea... | 1994-09-07 | 2007-05-23 | [
"hep-ph"
] | P. Ball |
hep-ph/9409245 | Operator product expansion and duality at finite temperature | The operator product expansion of current correlators at short distances, and
the notion of QCD-hadron duality are the cornerstone of QCD sum rules. The
extension of this programme to $T \neq 0$ is discussed, together with
applications to hot hadronic propagators. Indications are that the hadronic
spectrum suffers a su... | 1994-09-07 | 2009-10-28 | [
"hep-ph"
] | C.A.Dominguez |
hep-ph/9409242 | Towards Precise Determinations of the CKM Matrix without Hadronic
Uncertainties | We illustrate how the measurements of the CP asymmetries in
$B^0_{d,s}$-decays together with a measurement of $Br(K_L\to
\pi^\circ\nu\bar\nu)$ or $Br(K^+\to \pi^+\nu\bar\nu)$ and the known value of
$\mid V_{us}\mid $ can determine all elements of the Cabibbo-Kobayashi-Maskawa
matrix essentially without any hadronic unc... | 1994-09-07 | 2007-05-23 | [
"hep-ph"
] | A.J. Buras |
hep-ph/9409239 | Supersymmetry at LEPII, the Tevatron, and Future Accelerators | I present a brief review of prospects for discovering supersymmetry, focusing
primarily on the Tevatron and LEPII, but commenting on the LHC and a next
linear $\epem$ collider. Special emphasis is given to expectations in the
context of models with GUT boundary conditions motivated by Supergravity and
Superstrings. An ... | 1994-09-07 | 2007-05-23 | [
"hep-ph"
] | J.F. Gunion |
hep-ph/9409249 | Anomalous Evolution of Nonsinglet Structure Functions | We review a formalism that includes the effects of nonperturbative U(1)
symmetry breaking on the QCD evolution of nonsinglet structure functions. We
show that a strong scale dependence is generated in an intermediate energy
range $0.5 \lsim Q^2 \lsim 5$~GeV$^2$ for all values of $x$. We show that this
explains naturall... | 1994-09-07 | 2009-10-28 | [
"hep-ph"
] | Stefano Forte and Richard D. Ball (CERN, Geneva) |
hep-ph/9409241 | Meson Supermultiplet Decay Constants | We use a covariant supermultiplet theory to determine the primary coupling
constant associated with several types of two-body meson decay. Despite the
diverse range of decays considered the primary coupling constant is
surprisingly uniform. We envisage the extension of the techniques to heavy
quark cases, including as ... | 1994-09-07 | 2015-06-25 | [
"hep-ph"
] | N. Jones and R. Delbourgo |
hep-ph/9409251 | Axion search with optical technique | A brief review of particle physics motivations for axion existence is
followed by a discussion of optical observables that can be used for axion
detection. It is emphasised that the resonant photon - axion transition can
occur in the presence of low density gas bringing the experimentally accessible
quantities within t... | 1994-09-07 | 2009-09-25 | [
"hep-ph",
"astro-ph"
] | Ryszard Stroynowski and Ariel R. Zhitnitsky |
hep-ph/9409243 | Top Quarks and $CP$ Violation in Polarized $e^+e^-$ Collisions | Electroweak dipole moments of the top quark are conjectured and their effect
in polarized $e^+e^-$ collisions is examined for the expectation values of two
different $CP$-odd observables. One of these observables probes the real part
of the dipole moments whereas the other probes their imaginary part. It turns
out that... | 1994-09-07 | 2010-11-01 | [
"hep-ph"
] | Frank Cuypers and Saurabh Rindani |
hep-ph/9409240 | $b \to s(d) \gamma$ with a Vector-like Quark as Fourth-generation | We study the implications of a vector-like quark, especially a down-type
vector-like quark in $b \rightarrow s(d) \gamma$ including the neutral Higgs in
the calculation. After analyzing some possible constraints for the mixing, the
contribution may be significant for the $b \rightarrow d \gamma$, but not for
the $b \ri... | 1994-09-07 | 2012-08-27 | [
"hep-ph"
] | L.T. Handoko and T. Morozumi Pages : 19 pages |
hep-ph/9409253 | Charm Production at RHIC and LHC to $O(\alpha_{s}^3)$ | We present results on rapidity and transverse momentum distributions of
inclusive charm quark production in hadronic and heavy-ion collisions at RHIC
and LHC energies, including the next-to-leading order, $O(\alpha_s^3)$,
radiative corrections and the nuclear shadowing effect. We determine hadronic
and nuclear K-factor... | 1994-09-07 | 2009-09-25 | [
"hep-ph"
] | Ina Sarcevic |
hep-ph/9409252 | Z Plus Four Jets Production in Hadronic Collisions | We present first results of $Z+4$ jet cross sections at the Tevatron $p\bar
p$ collider with heavy quark flavor identification. The $Z + 4$ jet channel is
of particular interest as a normalizer for the $W +4$ jet background to top
quark signals, as a background to a possible $t\to cZ$ flavor-changing
neutral-current (F... | 1994-09-07 | 2007-05-23 | [
"hep-ph"
] | V. Barger, E. Mirkes, R.J.N. Phillips and T. Stelzer |
hep-ph/9409229 | Enhancement of CP Violation in B^+- to K_i^+- D^0 By Resonant Effects | Resonance width effects in charged $B$ decays to neutral $D$ mesons and
excited kaon states $K_i$ around 1400 MeV are shown to lead to large calculable
final state phases. $CP$ asymmetries are defined for any charged $B$ decay to
three pseudoscalar mesons involving intermediate overlapping resonance states.
Asymmetries... | 1994-09-06 | 2010-11-01 | [
"hep-ph"
] | David Atwood, Gad Eilam, Michael Gronau and Amarjit Soni |
hep-ph/9409237 | A Light $Z'$ Boson | A model of a light $Z'$ boson based on gauged $L_\mu - L_\tau$ $U(1)$
symmetry is constructed. The $Z'$ boson mass is constrained to be in the range
of 0.8 to 1 GeV from Z and $Z'$ mass relation, g-2 of muon, and tau decays. The
two body decay $\tau \rightarrow \mu Z'$ is possible. This will provide a
striking signatur... | 1994-09-06 | 2007-05-23 | [
"hep-ph"
] | Xiao-Gang He |
hep-ph/9409236 | CP Violation In Hyperon Decays | The present status for CP violation in hyperon decays is reviewed. | 1994-09-06 | 2007-05-23 | [
"hep-ph"
] | Xiao-Gang He and S. Pakvasa |
hep-ph/9409233 | Physics Beyond the Standard Model: Prospects and Perspectives | In this talk I discuss the effects of physics beyond the standard model on
the process $Z \to b\bar{b}$. I argue that, because the top-quark is heavy,
this process is susceptible to large corrections from new physics. | 1994-09-06 | 2007-05-23 | [
"hep-ph"
] | R. Sekhar Chivukula |
hep-ph/9409235 | Proton Decay In Supersymmetric Finite Grand Unificatione | We study proton decay in finite supersymmetric SU(5) grand unified theories.
We find that the finite supersymmetric SU(5) models are ruled out from this
consideration. | 1994-09-06 | 2007-05-23 | [
"hep-ph"
] | N.G. Deshpande, Xiao-Gang He and E. Keith |
hep-ph/9409238 | Additional Soft Jets in ${\rm t\bar{t}}$ Production at the Tevatron
$\pp$ Collider | A large fraction of top quark events in $\pp$ collisions at $1.8\ \TeV$ will
contain additional soft hadronic jets from gluon bremsstrahlung off the quarks
and gluons in the hard processes $\qq, gg \to \tt \to \bb \ww$. These extra
jets can cause complications when attempting to reconstruct $m_t$ from the
invariant mas... | 1994-09-06 | 2009-10-28 | [
"hep-ph"
] | Lynne H. Orr and W.J. Stirling |
hep-ph/9409228 | Looking Beyond the Standard Model | Within the framework of the Standard Model, the scale of electroweak symmetry
breaking is unstable to radiative corrections. We discuss two broad classes of
models of new physics (one with a strongly interacting and the other with a
perturbatively coupled electroweak symmetry breaking sector) in which this
stability is... | 1994-09-06 | 2009-09-25 | [
"hep-ph"
] | Xerxes Tata (University of Hawaii) |
hep-ph/9409230 | Higher-order QCD corrections to deep-inelastic sum rules | The brief review of the current status of the studies of the effects of the
higher-order perturbative QCD corrections to the deep-inelastic sum rules is
presented. | 1994-09-06 | 2007-05-23 | [
"hep-ph"
] | Andrei L. Kataev |
hep-ph/9409234 | CP Violation in a Multi-Higgs Doublet Model | We study CP violation in a multi-Higgs doublet model based on a $S_3 \times
Z_3$ horizontal symmetry. We consider two mechanisms for CP violation in this
model: a) CP violation due to complex Yukawa couplings; and b) CP violation due
to scalar-pseudoscalar mixings. We find that the predictions for
$\epsilon'/\epsilon$,... | 1994-09-06 | 2010-11-01 | [
"hep-ph"
] | N.G. Deshpande and Xiao-Gang He |
hep-ph/9409231 | 2 and 3-point functions in the ENJL-model | We discuss the extended Nambu-Jona-Lasinio model as a low energy expansion,
all two-point functions and an example of a three-point function to all orders
in momenta and quark masses. The model is treated at leading level in $1/N_c$
but otherwise exact. Some comments about the QCD flavour anomaly and Vector
Meson Domin... | 1994-09-06 | 2011-03-31 | [
"hep-ph"
] | J. Bijnens and J. Prades |
hep-ph/9409232 | A possible resolution of the CDF psi^prime anomaly | We consider the contribution of radially excited 2^3P_{1,2} states to
psi^prime production at the Tevatron energy. Production of these states via the
conventional gluon fusion mechanism and via gluon and charm quark fragmentation
processes is considered. We find that it is possible to account for the data on
psi^prime ... | 1994-09-06 | 2009-10-28 | [
"hep-ph"
] | D.P. Roy and K. Sridhar |
hep-ph/9409221 | Testing factorization in colour-suppressed beauty decays with the B ->
\eta_c + K(K^*) modes | The large discrepancy recently observed between $B \ra J/\Psi + K (K^*)$ data
and commonly used hadronic form factor models might be due to a breakdown of
the factorization assumption. By showing that the $B \ra \eta_c + K (K^*)$
rates can be calculated without relying on any form factor model, we propose a
test of the... | 1994-09-05 | 2016-08-24 | [
"hep-ph"
] | M.Gourdin, Y.Y. Keum and X.Y.Pham |
hep-ph/9409224 | CP Violation in the Heavy Neutrinos Production Process
$e^+e^-\rightarrow N_1N_2$ | The problem of CP conservation and CP violation for two heavy neutrinos
production in $e^+e^-$ interaction is considered. Very convenient way of
parametrization of the neutrino mass matrix, from which necessary and
sufficient condition for CP conservation easily follows, is presented. Contrary
to the Kobayashi-Maskawa ... | 1994-09-05 | 2010-11-01 | [
"hep-ph"
] | J.Gluza & M.Zralek (Silesian University) |
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