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 |
|---|---|---|---|---|---|---|
hep-ph/9211244 | Semileptonic Inclusive B--Decays and the Determination of $|V_{ub}|$
from QCD Sum Rules | We calculate the electron spectrum of semileptonic decays of B-mesons into
non-charmed hadrons. The shape of the spectrum obtained from QCD sum rules is
in general agreement with quark model calculations. At high electron energies
the decrease of the spectrum is less steep than predicted by Altarelli et al.
Our analysi... | 1992-11-13 | 2008-11-26 | [
"hep-ph"
] | P. Ball, V.M. Braun, H.G. Dosch |
hep-ph/9211241 | Antimatter in the Universe | Cosmological models which predict a large amount of antimatter in the
Universe are reviewed. Observational signatures and searches for cosmic
antimatter are briefly considered. A short discussion of new long range forces
which might be associated with matter and antimatter is presented. | 1992-11-12 | 2009-10-22 | [
"hep-ph"
] | A. Dolgov |
hep-ph/9211240 | Debajyoti Choudhury | Gluon fusion into a very heavy neutrino pair by Higgs exchange is shown to
lead to substantial production cross sections at $pp$ supercolliders even
without any extra generation of quarks. Rates are calculated for scalar as well
as pseudoscalar Higgs. The angular correlation between dileptons emerging from
the decays o... | 1992-11-12 | 2009-10-22 | [
"hep-ph"
] | Rohini M. Godbole and Probir Roy |
hep-ph/9211239 | Effective Hadron Dynamics: From Meson Masses to the Proton Spin Puzzle | We construct a three flavor chiral Lagrangian of pseudoscalars and vectors
with special emphasis on the symmetry breaking terms. Comparing tree level two
and three point functions with experiment allows us to first, fix the
parameters of the model (including the light quark mass ratios) and second, to
predict $m(K^{*+}... | 1992-11-11 | 2009-10-22 | [
"hep-ph"
] | J. Schechter, A. Subbaraman and H. Weigel |
hep-ph/9211238 | Properties of perturbative multi-particle amplitudes in $\phi^k$ and
$O(N)$ theories | Threshold amplitudes are considered for multi-particle production in $\phi^k$
and $O(N) ~\phi^4$ theories. It is found that the disappearance of tree-level
threshold amplitudes of $2$ on-shell particles producing a large number of
particles occurs in $\phi^k$ theory only for $k=3$ and $k=4$. The one-loop
correction to ... | 1992-11-11 | 2009-10-22 | [
"hep-ph"
] | B.H. Smith |
hep-ph/9211237 | Multiscalar production amplitudes beyond threshold | We present exact tree-order amplitudes for $H^* \to n~H$, for final states
containing one or two particles with non-zero three-momentum, for various
interaction potentials. We show that there are potentials leading to tree
amplitudes that satisfy unitarity, not only at threshold but also in the above
kinematical config... | 1992-11-11 | 2009-10-22 | [
"hep-ph"
] | E.N. Argyres, C.G. Papadopoulos and R. Kleiss |
hep-ph/9211236 | Lepton Number Violating Radiative $W$ Decay in Models with R-parity
Violation | Models with explicit R-parity violation can induce new rare radiative decay
modes of the $W$ boson into single supersymmetric particles which also violate
lepton number. We examine the rate and signature for one such decay,
$W\rightarrow \tilde l\gamma$, and find that such a mode will be very difficult
to observe, due ... | 1992-11-10 | 2009-10-22 | [
"hep-ph"
] | T.G. Rizzo |
hep-ph/9211235 | COBE and SUSY | We show that supersymmetry automatically leads to density fluctuations
$\Delta T/T\sim6\times10^{-6}$ in agreement with the recent COBE measurement. | 1992-11-09 | 2007-05-23 | [
"hep-ph"
] | Lawrence Connors, Ashley J. Deans and John S. Hagelin |
hep-ph/9211234 | A Separate Higgs? | We investigate the possibility of a multi-Higgs doublet model where the
lightest neutral Higgs boson ($h^0$) decouples from the fermion sector. We are
partially motivated by the four $\ell^+\ell^-\gamma\gamma$ events with
$M_{\gamma\gamma}\simeq60$\,GeV recently observed by the L3 collaboration,
which could be a signal... | 1992-11-09 | 2007-05-23 | [
"hep-ph"
] | V. Barger, N.G. Deshpande, J.L. Hewett, and T.G. Rizzo |
hep-ph/9211233 | Anomalous prompt photon production in hadronic collisions at low-$x_T$ | We investigate the discrepancy that exists at low-$x_T=2p_T/\sqrt{s}$ between
the next--to--leading order QCD calculations of prompt photon production and
the measured cross section. The central values of the measured cross section
are of order 100\% larger than QCD predictions in this region. It has been
suggested tha... | 1992-11-09 | 2009-10-22 | [
"hep-ph"
] | Damien Pierce |
hep-ph/9211232 | Implications of LEP Results for SO(10) Grandunification with Two
Intermediate Stages | We consider the breaking of the grand unification group $SO(10)$ to the
standard model gauge group through several chains containing two intermediate
stages. Using the values of the gauge coupling constants at scale $M_Z$ derived
from recent LEP data, we determine the range of their intermediate and
unification scales.... | 1992-11-09 | 2009-10-22 | [
"hep-ph"
] | N.G. Deshpande, E. Keith, Palash B. Pal |
hep-ph/9211230 | Radiatively Corrected Bound on the Light Higgs Mass in a Minimal Non
Minimal Supersymmetric Standard Model | The neutral Higgs sector of the Minimal non Minimal Supersymmetric Standard
Model is considered. By effective potential and R.G.E. supported method; an
upper bound of the lightest Higgs is analysed. From the request of
perturbativity of the coupling in the superpotential, adding the leading stop
top contributions, the ... | 1992-11-09 | 2007-05-23 | [
"hep-ph"
] | D. Comelli (Dept. of Theorical Physics, University of Trieste and INFN
sez.di Trieste) |
hep-ph/9211229 | Casimir Energy in the Skyrme Model | The so called Casimir energy embodies the O($(N_c)^0$) contribution to the
skyrmion mass according to the semi-classical expansion theory of solitons. We
claim that this contribution can be accurately estimated despite the fact that
some of the counterterms, provided in principle by chiral perturbation theory,
are not ... | 1992-11-09 | 2007-05-23 | [
"hep-ph"
] | B. Moussallam |
hep-ph/9211231 | Fermi-Dirac corrections to relic abundances | We derive an equation for the evolution of the number density of a massive
particle species in the early Universe, which correctly accounts for the
Fermi-Dirac (FD) statistics. The FD-corrections are sizable and potentially
important if the decoupling from the thermal equilibrium takes place at
temperatures of the orde... | 1992-11-09 | 2009-10-22 | [
"hep-ph"
] | A. D. Dolgov and K. Kainulainen |
hep-ph/9211228 | Proposed Tests for Minimal SU(5) Supergravity at Fermilab, Gran Sasso,
SuperKamiokande, and LEP | A series of predictions are worked out in order to put the minimal $SU(5)$
supergravity model under experimental test. Using the two-loop gauge coupling
renormalization group equations, with the inclusion of supersymmetric threshold
corrections, we calculate a new value for the proton decay rate in this model
and find ... | 1992-11-08 | 2009-08-25 | [
"hep-ph"
] | J. Lopez, D. Nanopoulos, H. Pois, and A. Zichichi |
hep-ph/9211227 | Violation of the Bjorken Sum Rule in QCD | We show that the Bjorken sum rule for the first moment of the polarized
nucleon structure function $g_1$ is not necessarily satisfied in QCD if the
axial anomaly is taken into account. We argue that nonperturbative QCD effects
should lead to a violation of the sum rule of the order of the percentage
isospin violation i... | 1992-11-07 | 2009-10-22 | [
"hep-ph"
] | Stefano Forte |
hep-ph/9211217 | A Possible Measurement of CP-Violation in B0-decays by ATLAS on LHC | A possibility to measure CP-violation in B0-decays by ATLAS experiment was
investigated. With one year of running at luminosity 10^33 cm-2s-1 with a muon
pt-trigger threshold of 20GeV and rapidity coverage eta<2.5 of the tracking
detector the rate of 1490 events B0->J/psi->mumupipi can be reached. | 1992-11-06 | 2007-05-23 | [
"hep-ph"
] | Maria Smizanska & Julius Hrivnac |
hep-ph/9211215 | "Vortex Solution in a Multi-Higgs System and Its Physical Implication," | Classical vortex solutions in $(1+2)$-dimensional multi-Higgs systems are
studied. In particular the existence of such a solution requires equal
characteristic lengths and a specific relation between the ratio of the two
Higgs vacuum expectation values and the couplings in the Higgs potential, if
$\lambda_3\neq 0$. | 1992-11-06 | 2009-10-22 | [
"hep-ph",
"hep-th"
] | HoSeong La |
hep-ph/9211216 | On Constraints for Heavy-Meson Form Factors | We examine the recent work of de Rafael and Taron where model-independent
bounds on the Isgur-Wise function are presented. We first argue that the bounds
cannot hold in as much generality as implied. We show that the effects of
resonances omitted in their discussion (such as heavy-heavy ``onium'' states
below threshold... | 1992-11-06 | 2009-10-22 | [
"hep-ph"
] | Benjamin Grinstein and Paul F. Mende |
hep-ph/9211220 | Critical Temperature for the $\LAMBDA (\PHI^{4})_{4}$ Theory within the
$\DELTA$ -Expansion | We apply the $\delta$-expansion perturbation scheme to the $\lambda \phi_{4}$
self-interacting scalar field theory in 3+1 D at finite temperature. In the
$\delta$-expansion the interaction term is written as $\lambda (\phi^{2})^{1 +
\delta}$ and $\delta$ is considered as the perturbation parameter. We compute,
in this ... | 1992-11-06 | 2007-05-23 | [
"hep-ph"
] | Rudnei O. Ramos |
hep-ph/9211218 | Quantum Corrections to Nucleation Rates | In this paper we show how to compute in a consistent way nucleation rates in
field theory at finite temperatures, with metastable vacuum. Using the
semiclassical approach in field theory at finite temperature we show that the
prefactor term can be calculated explicitly (in the thin-wall approximation)
and that the same... | 1992-11-06 | 2008-02-03 | [
"hep-ph"
] | G.C.Marques and Rudnei O.Ramos |
hep-ph/9211221 | Small Angle Polarization in High Energy P--P Scattering Through
Nonperturbative Chiral Symmetry Breaking | We show that a large anomalous contribution due to nonperturbative
instanton-like gluonic field configurations to the axial charge of the proton
implies high-energy spin effects in $p-p$ elastic scattering. This is the same
mechanism which is responsible for anomalous baryon number violation at high
energy in the stand... | 1992-11-06 | 2009-10-22 | [
"hep-ph"
] | Mauro Anselmino and Stefano Forte |
hep-ph/9211226 | Simply Modeling Meson HQET | A simple relativistic model of heavy-quark-light-quark mesons is proposed. In
an expansion in inverse powers of the heavy quark mass we find that all zeroth
and first order heavy quark symmetry relations are satisfied. The main results
are: - the difference between the meson mass and the heavy quark mass plays a
signif... | 1992-11-06 | 2009-10-22 | [
"hep-ph"
] | B. Holdom and M. Sutherland |
hep-ph/9211222 | Analyticity and the Isgur-Wise Function | We reconsider the recent derivation by de Rafael and Taron of bounds on the
slope of the Isgur-Wise function. We argue that one must be careful to include
cuts starting below the heavy meson pair production threshold, arising from
heavy quark-antiquark bound states, and that if such cuts are properly
accounted for then... | 1992-11-06 | 2010-11-01 | [
"hep-ph"
] | Adam F. Falk, Michael Luke and Mark B. Wise |
hep-ph/9211224 | SU(16) grandunification: breaking scales, proton decay and neutrino
magnetic moment | We give a detailed renormalization group analysis for the SU(16) grandunified
group with general breaking chains in which quarks and leptons transform
separately at intermediate energies. Our analysis includes the effects of Higgs
bosons. We show that the grandunification scale could be as low as $\sim
10^{8.5}$ GeV an... | 1992-11-06 | 2009-10-22 | [
"hep-ph"
] | N.G. Deshpande, E. Keith, and Palash B. Pal |
hep-ph/9211219 | Thermal Fluctuations and Validity of the 1-Loop Effective Potential | We examine the validity of the 1-loop approximation to the effective
potential at finite temperatures and present a simple test for its reliability.
As an application we study the standard electroweak potential, showing that for
a Higgs mass above 70 GeV, and afirly independent of the top mass (with $m_{t}
> 90 GeV$, t... | 1992-11-06 | 2009-10-22 | [
"hep-ph"
] | Marcelo Gleiser and Rudnei O. Ramos |
hep-ph/9211223 | On the Limits of Chiral Perturbation Theory | We consider the relation between the breakdown scale of chiral perturbation
theory, $\Lambda_\chi$, for large values of $N$ (flavor), and the scale
associated with ``new" physical thresholds. This question is addressed using
both the linear $\sigma$ model and an asymptotically-free gauge theory to
describe the high ene... | 1992-11-06 | 2009-10-22 | [
"hep-ph"
] | Thomas Appelquist and John Terning |
hep-ph/9211225 | Final-State Interaction of Longitudinal Vector Bosons | In the standard Higgs model of electroweak symmetry breaking, the Higgs boson
is associated with both vector-boson and fermion mass generation. In contrast,
we discuss a two-Higgs-doublet model in which these masses are associated with
two different scalar bosons. We show that the Higgs boson associated with
vector-bos... | 1992-11-06 | 2008-11-26 | [
"hep-ph"
] | J.-L. Basdevant, E. L. Berger, D. Dicus, C. Kao and S. Willenbrock |
hep-ph/9211212 | Scattering with Baryon Number Violation -- The Case of Higgs Particle
Production -- | \noindent A formalism based on path-integral expression of time-evolution
operator during tunneling at a finite energy proposed by the authors is applied
to $SU(2)$ gauge-Higgs system to produce Higgs particles with $\Delta B=1$.
Instead of starting from instanton tunneling at the zero energy, a classical
bounce soluti... | 1992-11-05 | 2017-02-01 | [
"hep-ph"
] | K.Funakubo, S.Otsuki, K.Takenaga and F.Toyoda |
hep-ph/9211214 | Neutrino Mixing due to a Violation of the Equivalence Principle | Massless neutrinos will mix if their couplings to gravity are flavor
dependent, i.e., violate the principle of equivalence. Because the
gravitational interaction grows with neutrino energy, the solar neutrino
problem and the recent atmospheric neutrino data may be simultaneously
explained by violations at the level of ... | 1992-11-05 | 2008-11-26 | [
"hep-ph"
] | J. Pantaleone, A. Halprin, C.N. Leung |
hep-ph/9211213 | On the role of vector mesons in topological soliton stability | Isospin one vector mesons (in particular the $\rho$) are usually described as
massive Yang-Mills particles in the chiral Lagrangian. We investigate some
aspects of an alternative approach in the soliton sector. It is found that the
soliton is stable in very much the same way as with the $\omega$-meson and that
spontane... | 1992-11-05 | 2009-10-22 | [
"hep-ph"
] | A. Abada, D. Kalafatis and B. Moussallam |
hep-ph/9211209 | Systematic Study of Fermion Masses and Mixing Angles in Horizontal SU(2)
Gauge Theory | Despite its great success in explaining the basic interactions of nature, the
standard model suffers from an inability to explain the observed masses of the
fundamental particles and the weak mixing angles between them. We shall survey
a set of possible extensions to the standard model, employing an SU(2)
``horizontal'... | 1992-11-04 | 2009-10-22 | [
"hep-ph"
] | Donald S. Shaw and Ray R. Volkas |
hep-ph/9211211 | Self-consistent Improvement of the Finite Temperature Effective
Potential | We present a self-consistent calculation of the finite temperature effective
potential for $\lambda \phi^4$ theory, using the composite operator effective
potential in which an infinite series of the leading diagrams is summed up. Our
calculation establishes the proper form of the leading correction to the
perturbative... | 1992-11-04 | 2009-10-22 | [
"hep-ph",
"hep-th"
] | G. Amelino-Camelia and S.-Y. Pi |
hep-ph/9211210 | Evidence For SUSY from GUTS? Evidence For GUTS From SUSY! | We review the theoretical and experimental status of minimal grand unified
theories (GUTS), contrasting the failure of minimal non-supersymmetric $SU(5)$
with the success of the minimal supersymmetric $SU(5)$ and minimal
supersymmetric Flipped $SU(5)\times U(1)$ models. We show that a reasonable
value for the universal... | 1992-11-04 | 2007-05-23 | [
"hep-ph"
] | John S. Hagelin and S. Kelley |
hep-ph/9211208 | Cosmology and Astrophysics 1992 | I review recent developments in cosmology and astrophysics relevant to
particle physics, focussing on the following questions: What's new in 1992?
What have we learned since the last ICHEP meeting in 1990? and What are the
prospects for the future? AMong the topics explicitly discussed are: COBE,
Large Scale Structure,... | 1992-11-03 | 2009-09-25 | [
"hep-ph",
"astro-ph"
] | Lawrence M. Krauss |
hep-ph/9211201 | On the COBE Discovery - for Pedestrians | A recent discovery by the COBE satellite is presented, and its importance
discussed in the context of the physics of the early Universe. The various
implications for our understanding of the structure of the Universe are
outlined. | 1992-11-02 | 2010-12-09 | [
"hep-ph",
"astro-ph"
] | Leszek Roszkowski |
hep-ph/9211202 | Flavour Distributions in the Nucleons: SU(2) Sea Asymmetry or Isospin
Symmetry Breaking? | The Gottfried sum rule violation reported by the New Muon Collaboration(NMC)
was interpreted as indication for a flavour asymmetry of the sea quark in the
nucleons. We investigate the alternative possibility that isospin symmetry
between the proton and the neutron is breaking. We examine systematically the
consequences... | 1992-11-02 | 2009-10-22 | [
"hep-ph",
"nucl-th"
] | Bo-Qiang Ma, Andereas Schaefer, and Walter Greiner |
hep-ph/9211203 | Bell's Inequality and $\tau$-Physics at LEP | In this talk given at the TAU92 Workshop, Columbus, OH, Sept. 92, we
summarize results presented in more detail in a recent paper by S. Abel, M.
Dittmar and the author where we gave a general proof that Bell's inequality can
not be tested at a collider experiment. In particular, a measurement of
correlated tau-spins at... | 1992-11-02 | 2007-05-23 | [
"hep-ph"
] | Herbert Dreiner |
hep-ph/9211265 | Dynamical confinement in bosonized QCD2 | In the bosonized version of two dimensional theories non trivial boundary
conditions (topology) play a crucial role. They are inevitable if one wants to
describe non singlet states. In abelian bosonization, color is the charge of a
topological current in terms of a non-linear meson field. We show that
confinement appea... | 1992-11-02 | 2009-10-22 | [
"hep-ph"
] | A. Ferrando and V. Vento |
hep-ph/9211204 | R-Parity Violation at HERA | We summarize the signals at HERA in supersymmetric models with explicitly
broken R-parity. As the most promising case, we consider in detail the resonant
production of single squarks through an operator $L_1Q_i{ \bar D}_j$, a
production process analogous to that for leptoquarks. However, the dominant
decay of the squar... | 1992-11-02 | 2009-10-22 | [
"hep-ph"
] | Jon Butterworth and Herbert Dreiner |
hep-ph/9211207 | Ansatz for Quark, Charged Lepton, and Neutrino Masses in SUSY GUTS | We extend a fermion mass matrix Ansatz by Giuduce to include neutrino masses.
The previous predictions are maintained. With two additional parameters, a
large Majorana neutrino mass and a hierarchy factor, we have seven {\it
further} low energy predictions: the masses of the neutrinos, the mixing angles
and the phase i... | 1992-11-02 | 2009-10-22 | [
"hep-ph"
] | H. Dreiner, G. K. Leontaris and N. D. Tracas |
hep-ph/9211205 | QCD Corrections to the Light Higgs Boson Decay into a Charm- Anticharm
or Bottom- Antibottom Pair within the Minimal Supersymmetric Model | We present the results of the contributions to the decay rate of the lightest
Higgs particle into a charm-anticharm and bottom-antibottom pair within the
minimal supersymmetric standard model when scalar quarks and a gluino are taken
within the relevant loop diagrams. We show that in the case where the vacuum
expectati... | 1992-11-02 | 2011-01-25 | [
"hep-ph"
] | Heinz K\"onig |
hep-ph/9211206 | SO(10) Cosmic Strings and Baryon Number Violation | SO(10) cosmic strings formed during the phase transition Spin(10)
$\rightarrow$ SU(5) $\times{\cal Z}_2$ are studied. Two types of strings ---
one effectively Abelian and one non-Abelian --- are constructed and the string
solutions are calculated numerically. The non-Abelian string can catalyze
baryon number violation ... | 1992-11-02 | 2009-10-22 | [
"hep-ph",
"astro-ph"
] | Chung-Pei Ma |
hep-ph/9211264 | About the realization of chiral symmetry in QCD2 | Two dimensional massless Quantum Chromodynamics presents many features which
resemble those of the true theory. In particular the spectrum consists of
mesons and baryons arranged in flavor multiplets without parity doubling. We
analyze the implications of chiral symmetry, which is not spontaneously broken
in two dimens... | 1992-11-02 | 2009-10-22 | [
"hep-ph"
] | A. Ferrando and V. Vento |
hep-ph/9211274 | Nucleon and delta masses in QCD | Using the positivity of the path integral measure of $QCD$ and defining a
structure for the quark propagator in a background field according to the
fluxon scenario for confinement, we calculate and compare the correlators for
nucleon and delta. From their shape we elucidate about the origin of their mass
difference, wh... | 1992-11-02 | 2010-11-01 | [
"hep-ph"
] | M. Rafecas and V. Vento |
hep-ph/9210278 | On the High $T$ Phase Transition in the Gauged $SU(2)$ Higgs Model | We study the effective field theory of a weakly coupled 3+1d gauged $\phi^4$
type model at high temperature. Our model has $4N$ real scalars
($N$ complex Higgs doublets) and a gauge group $SU(2)$ which is spontaneously
broken by a nonzero scalar field $vev$ at zero temperature.
We find, for sufficiently large $N$, ... | 1992-10-30 | 2009-10-22 | [
"hep-ph"
] | Vidyut Jain and Aris Papadopoulos |
hep-ph/9210281 | Structure functions for large $x$ and renormalization of Wilson loops | We discuss the relation between partonic distributions near the phase space
boundary and Wilson loop expectation values calculated along paths partially
lying on the light-cone. Due to additional light-cone singularities,
multiplicative renormalizability for these expectation values is lost.
Nevertheless we establish t... | 1992-10-30 | 2008-11-26 | [
"hep-ph"
] | G.P.Korchemsky and G.Marchesini |
hep-ph/9210280 | The Simplest, String-Derivable, Supergravity Model and its Experimental
Predictions | We present the simplest, string-derivable, supergravity model and discuss its
experimental consequences. This model is a new string-inspired flipped $SU(5)$
which unifies at the string scale $M_U=10^{18}\GeV$ due to the introduction of
an additional pair of \r{10},\rb{10} flipped $SU(5)$ representations which
contain n... | 1992-10-30 | 2009-08-25 | [
"hep-ph"
] | J. Lopez, D. Nanopoulos, and A. Zichichi |
hep-ph/9210279 | Tevatron Mass Limits for Heavy Quarks Decaying via Flavor Changing
Neutral Current | The dimuon and dielectron data from the Tevatron $\bar pp$ collider are used
to probe for heavy quarks, which decay dominantly via flavour changing neutral
current. Depending on whether the $FCNC$ decay occurs at the tree or loop
level, one gets a lower mass limit of 85 or 75 GeV. The former applies to
singlet, vector ... | 1992-10-30 | 2008-11-26 | [
"hep-ph"
] | Biswarup Mukhopadhyaya and D.P. Roy |
hep-ph/9210274 | A Comment on the Strong Interactions of Color-Neutral Technibaryons | We estimate the cross section for the scattering of a slow, color-neutral
technibaryon made of colored constituents with nuclei. We find a cross section
of order $A^2\ 10^{-45}$ cm$^2$, where $A$ is the atomic number of the nucleus.
Even if technibaryons constitute the dark matter in the galactic halo, this is
too smal... | 1992-10-29 | 2009-10-22 | [
"hep-ph",
"astro-ph"
] | R. Sekhar Chivukula, Andrew G. Cohen, Michael Luke, and Martin J.
Savage |
hep-ph/9210276 | Critical Constraints on Chiral Hierarchies | We consider the constraints that critical dynamics places on models with a
top quark condensate or strong extended technicolor (ETC). These models require
that chiral-symmetry-breaking dynamics at a high energy scale plays a
significant role in electroweak symmetry breaking. In order for there to be a
large hierarchy b... | 1992-10-29 | 2009-10-22 | [
"hep-ph",
"hep-lat"
] | R. Sekhar Chivukula, Mitchell Golden, and Elizabeth H. Simmons |
hep-ph/9210275 | Heavy to Light Semileptonic Transitions in the Heavy Quark Effective
Theory | The scaling behavior of semileptonic form-factors in Heavy to Light
transitions is studied in the Heavy Quark Effective Theory. In the case of
$H\rightarrow \pi e\nu$ it is shown that the same scaling violations affecting
the heavy meson decay constant will be present in the semileptonic
form-factors. | 1992-10-29 | 2007-05-23 | [
"hep-ph"
] | G. Burdman |
hep-ph/9210277 | Threshold Effects on Heavy Quark Production in $\gamma\gamma$
Interactions | The exchange of gluons between heavy quarks produced in $e^+e^-$ interactions
results in an enhancement of their production near threshold. We study QCD
threshold effects in $\gamma\gamma$ collisions. The results are relevant to
heavy quark production by beamstrahlung and laser back-scattering in future
linear collider... | 1992-10-29 | 2010-11-01 | [
"hep-ph"
] | O.J.P. Eboli, M.C. Gonzalez-Garcia, F. Halzen, and S.F. Novaes |
hep-ph/9210273 | A More Effective Potential | In theories with spontaneous symmetry breaking, the conventional effective
potential possesses a defective loop expansion. For such theories, the exact
effective potential $V(\phi_c,T)$ is real and convex, but its perturbative
series is complex and concave at small $\phi_c$ and $T$. A more effective
potential is availa... | 1992-10-29 | 2009-10-22 | [
"hep-ph"
] | Kevin Cahill |
hep-ph/9210271 | Search for Dileptons in Z decay | The lepton family number violation $Z$ boson decay, $Z \to e^-e^-\mu^+\mu^+$
or $e^+e^+\mu^-\mu^-$, mediated by a dilepton, e.g. from an SU(15) theory, is
calculated. The branching ratio of such exotic decay for allowed dilepton
masses is found to be smaller than 10$^{-10}$. | 1992-10-28 | 2009-10-22 | [
"hep-ph"
] | P. H. Frampton, Daniel Ng, T.W. Kephart, T. C. Yuan |
hep-ph/9210270 | Search for Heavy Leptons at Hadron Colliders | Four models are considered which contain heavy leptons beyond the three
families of the standard model. Two are fourth-generation extensions of the
standard model in which the right-handed heavy leptons are either isosinglets
or in an isodoublet; the other two are motivated by the aspon model of CP
violation. In all th... | 1992-10-28 | 2010-11-01 | [
"hep-ph"
] | Paul H. Frampton, Daniel Ng, Marc Sher and Yao Yuan |
hep-ph/9210272 | New Contribution to Coherent neutralino-Nucleus Scattering | We discuss coherent scattering between supersymmetric neutralinos and nuclei
via an effective neutralino-gluon interaction. We identify two new classes of
diagrams which are not treated in the existing literature. These occur at the
same order of perturbation theory as the previously considered diagrams. The
new contri... | 1992-10-28 | 2009-10-22 | [
"hep-ph"
] | Mauel Drees and Mihoko M. Nojiri |
hep-ph/9210269 | Nonperturbative QCD efects in weak hadronic decays | QCD-based analysis of nonfactorizable parts of weak nonleptonic amplitudes is
reported.
Nonperturbative effects due to soft gluon exchange play a key role leading to
the emergence of a dynamical rule of discarding $1/N_c$ corrections. | 1992-10-27 | 2007-05-23 | [
"hep-ph"
] | B. Blok and M. Shifman |
hep-ph/9210267 | New QCD Effects at Large x | In heavy quark production at large Feynman $x$ there are two hardness scales,
one given by the heavy quark pair mass $\M^2$\ and the other by
$\Lambda_{QCD}^2/(1-x)$. When these two scales are comparable, the twist
expansion of Perturbative QCD breaks down. We discuss the dynamics in this new
QCD limit, where $\mu^2=\M... | 1992-10-27 | 2010-11-01 | [
"hep-ph"
] | Paul Hoyer |
hep-ph/9210268 | Heavy-Quark Baryons as Skyrmions | I discuss recent development on the description of heavy-quark (such as
charmed and bottom) baryons as one or more heavy mesons "wrapped" by a
skyrmion. Amazingly enough, such a description naturally arises when
light-quark chiral symmetry and heavy-quark spin symmetry are incorporated in
an effective Lagrangian. I int... | 1992-10-27 | 2007-05-23 | [
"hep-ph"
] | Mannque Rho (Saclay) |
hep-ph/9210266 | Radiative corrections to the decay H==>hh in the Minimal Supersymmetric
Standard Model | We set up a suitable renormalization programme for the one-loop computation
of the decay rate Gamma(H==>hh) in the Minimal Supersymmetric extension of the
Standard Model. We then perform an explicit diagrammatic calculation, including
the full contributions from top, bottom, stop and sbottom loops. We find that,
for ta... | 1992-10-27 | 2011-01-27 | [
"hep-ph"
] | A.Brignole and F.Zwirner |
hep-ph/9210265 | Weak Radiative Hyperon Decays in Chiral Perturbation Theory | The parity-conserving $a$ and parity-violating $b$ amplitudes for weak
radiative hyperon decay are studied using chiral perturbation theory. The
imaginary parts of $a$ and $b$ are computed using unitarity. The real part of
$b$ is dominated by a one-loop infrared divergent graph which is computed. The
real part of $a$ h... | 1992-10-27 | 2008-11-26 | [
"hep-ph"
] | Elizabeth Jenkins, Michael Luke, Aneesh V. Manohar, and Martin J.
Savage |
hep-ph/9210262 | A Bound on the Energy Loss of Partons in Nuclei | We derive a quantum mechanical upper bound on the amount of radiative energy
loss suffered by high energy quarks and gluons in nuclear matter. The bound
shows that the nuclear suppression observed in quarkonium production at high
$x_F$ cannot be explained in terms of energy loss of the initial or final
parton states. W... | 1992-10-26 | 2009-09-11 | [
"hep-ph"
] | Stanley J. Brodsky and Paul Hoyer |
hep-ph/9210264 | Three Dimensional Statistical Field Theory for Density Fluctuations in
Heavy-Ion Collsiions | A statistical field theory of particle production is presented using a
gaussian functional in three dimensions. Identifying the field with the
particle density fluctuation results in zero correlations of order three and
higher, while the second order correlation function is of a Yukawa form. A
detailed scheme for proje... | 1992-10-26 | 2015-06-25 | [
"hep-ph"
] | H. C. Eggers, H-Th. Elze and I. Sarcevic |
hep-ph/9210263 | Intermittency and Multidimensional Correlations | We review recent experimental results on intermittency and multidimensional
particle correlations in high-energy leptonic, hadronic and nuclear collisions.
We discuss different theoretical models, including self-similar cascading and
QCD parton showers, models with phase transitions and the three-dimensional
statistica... | 1992-10-26 | 2009-10-22 | [
"hep-ph"
] | I. Sarcevic |
hep-ph/9210261 | Topological Defect Models of Structure Formation After the COBE
Discovery of CMB Anisotropies | The COBE satellite has discovered anisotropies in the cosmic microwave
background (CMB) consistent with a scale invariant spectrum of density
perturbations. As reviewed in this lecture, topological defect models of
structure formation generically produce such a spectrum. We give a summary of
the cosmic string and globa... | 1992-10-24 | 2007-05-23 | [
"hep-ph",
"astro-ph"
] | Robert H. Brandenberger (Brown University) |
hep-ph/9210260 | Universal Evolution of CKM Matrix Elements | We derive the two-loop evolution equations for the Cabibbo-Kobayashi-Maskawa
matrix. We show that to leading order in the mass and CKM hierarchies the
scaling of the mixings $|V_{ub}|^2$, $|V_{cb}|^2$, $|V_{td}|^2$, $|V_{ts}|^2$
and of the rephase-invariant CP-violating parameter $J$ is universal to all
orders in pertu... | 1992-10-23 | 2009-09-15 | [
"hep-ph"
] | V. Barger, M. S. Berger and P. Ohmann |
hep-ph/9210259 | Quark model calculation of $\eta \to l^+ l^-$ to all orders in the bound
state relative momentum | The electromagnetic box diagram for the leptonic decays of pseudoscalar
mesons in the quark model is evaluated to all orders in ${\bf p} / m_q$, where
${\bf p}$ is the relative three-momentum of the quark-antiquark pair and $m_q$
is the quark mass. We compute $B_P \equiv \Gamma(\eta \to l^+ l^-) /
\Gamma(\eta \to \gamm... | 1992-10-23 | 2009-10-22 | [
"hep-ph"
] | B. Margolis, J. Ng, M. Phipps, and H. D. Trottier |
hep-ph/9210258 | Non--perturbative evidence for non--decoupling of heavy fermions | We investigate, using a $1/N$ expansion, the behavior of a parameter in the
scalar--fermion sector of the standard model that shows perturbative
non--decoupling as the fermion becomes heavy. This low energy parameter is
related to the $S$ parameter defined through the $W_3-B$ vacuum polarization
tensor. We obtain the l... | 1992-10-23 | 2008-11-26 | [
"hep-ph"
] | Kenichiro Aoki, Santiago Peris |
hep-ph/9210256 | Generation Mass Hierarchy in Superstring Derived Models | I discuss the problem of generation mass hierarchy in the context of
realistic superstring models which are constructed in the free fermionic
formulation. These models correspond to models which are compactified on
$Z_2\times Z_2$ orbifold. I suggest that the hierarchy among the generations
results from horizontal symm... | 1992-10-22 | 2009-10-22 | [
"hep-ph",
"hep-th"
] | Alon E. Faraggi |
hep-ph/9210257 | Tau Decay Puzzles and Possible Light Gluinos | The relation of the strong coupling constant as measured in tau decay to
other low energy determinations is considered with special attention to its
impact on the question of the possible existence of light gluinos. | 1992-10-22 | 2007-05-23 | [
"hep-ph"
] | L. Clavelli |
hep-ph/9210254 | Intermittency and Particle Correlations: Theory | We review recent theoretical developments in understanding the intermittency
phenomenon observed in high-energy leptonic, hadronic and nuclear collisions.
In particular, we discuss self-similar cascading and QCD parton showers, models
with models with phase transitions, and the three-dimensional statistical field
theor... | 1992-10-21 | 2009-10-22 | [
"hep-ph"
] | Ina Sarcevic |
hep-ph/9210255 | Analytical on-shell QED results: 3-loop vacuum polarization, 4-loop
beta-function and the muon anomaly | We present the results of analytical calculations of the 3-loop contributions
to the asymptotic photon vacuum polarization function, in the on shell scheme,
and of the 4-loop contributions to the on shell QED beta-function. These are
used to evaluate various 4-loop and 5-loop contributions to the muon anomaly.
Our anal... | 1992-10-21 | 2019-08-17 | [
"hep-ph",
"hep-th"
] | D.J. Broadhurst, A.L. Kataev and O.V. Tarasov |
hep-ph/9210250 | The fermion mass problem | In this talk I review the `puzzles' associated with the fermion mass matrices
and describe some recent attempts to resolve them, at least partially. Models
which attempt to explain the observed mass hierarchy as arising from radiative
corrections are discussed. I then scrutinize possible inter--relations among
quark an... | 1992-10-20 | 2007-05-23 | [
"hep-ph"
] | K.S. Babu |
hep-ph/9210251 | Heavy top quark from Fritzsch mass matrices | It is shown, contrary to common belief, that the Fritzsch ansatz for the
quark mass matrices admits a heavy top quark. With the ansatz prescribed at the
supersymmetric grand unified (GUT) scale, one finds that the top quark may be
as heavy as 145 GeV, provided that tan$\beta$ (the ratio of the vacuum
expectation values... | 1992-10-20 | 2010-11-01 | [
"hep-ph"
] | K.S. Babu and Q. Shafi |
hep-ph/9210252 | Radiative Origin of the Fermion Mass Hierarchy: A Realistic and
Predictive Approach | The up-down splitting within quark families increases with the family number:
m_u ~ m_d, m_c > m_s, m_t >> m_b. We show an approach that realizes this
feature of the spectrum in a natural way. We suggest that the mass hierarchy is
first generated by radiative effects in a sector of heavy isosinglet fermions,
and then p... | 1992-10-20 | 2008-02-03 | [
"hep-ph"
] | Zurab Berezhiani and Riccardo Rattazzi |
hep-ph/9210249 | Avalanche in the Valley (Fermions, Anomaly and Unitarity in High-Energy
Electroweak Interactions) | Problems related to fermions, unitarity and chiral anomaly in high energy
electroweak interactions, are investigated. Particular attention is paid to the
correct functional integration over fermion fields in the background of
instanton-anti\-instanton type configurations. This leads to an expansion of
correlation funct... | 1992-10-20 | 2011-07-19 | [
"hep-ph"
] | R. Guida and K. Konishi |
hep-ph/9210253 | Static and Dynamic Critical Phenomena at a Second Order QCD Phase
Transition | In QCD with two flavors of massless quarks, the chiral phase transition is
plausibly in the same universality class as the classical four component
Heisenberg antiferromagnet. Therefore, renormalization group techniques
developed in the study of phase transitions can be applied to calculate the
critical exponents which... | 1992-10-20 | 2009-10-22 | [
"hep-ph",
"astro-ph",
"hep-lat"
] | K. Rajagopal and F. Wilczek |
hep-ph/9210248 | Nuclear Axial-Charge Transitions in Chiral Perturbation Theory | We develop a systematic chiral perturbation expansion for the calculation of
meson-exchange currents in nuclei and apply the formalism to nuclear axial
currents. We summarize the principal results of such a calculation to one loop
order on nuclear axial-charge transitions which provides a strong support to
the conjectu... | 1992-10-20 | 2007-05-23 | [
"hep-ph"
] | Tae-Sun Park, Dong-Pil Min and Mannque Rho |
hep-ph/9210245 | Scaling limit of a non-relativistic model | I calculate the structure function for scattering from the two-body bound
state in its lowest level in a non-relativistic model of confined scalar
``quarks'' of masses $m_A$ and $m_B$. The scaling limit in $x={\bf
q}^2/2(m_A+m_B)q^0$ exists and is non-vanishing only for the values
$x=m_A/(m_A+m_B)$ and $x=m_B/(m_A+m_B)... | 1992-10-19 | 2009-10-22 | [
"hep-ph"
] | O.W. Greenberg |
hep-ph/9210247 | The Perturbative Onset of Multiparticle Production in Weak Interactions | We use perturbation theory to estimate the energy scale beyond which
multiparticle final states become a dominant feature of high energy weak
interactions. Using estimates from a weak parton model and comparing two, three
and four body final states we deduce that multiparticle states become important
at energy scales i... | 1992-10-19 | 2011-07-19 | [
"hep-ph"
] | D.A. Morris and R. Rosenfeld |
hep-ph/9210244 | Zeros of Tree-Level Amplitudes at Multi-Boson Thresholds | Propagation of particles with emission of arbitrary number of identical
bosons all being at rest is considered. It is shown that in certain models the
tree-level amplitudes for production of $n$ scalar bosons by two incoming
particles are all equal to zero at the threshold starting from some small
number $n$. In partic... | 1992-10-19 | 2009-10-22 | [
"hep-ph"
] | M.B. Voloshin |
hep-ph/9210246 | Chern-simon type photon mass from fermion electric dipole moments at
finite temperature in 3+1 dimensions | We study the low energy effective field theory of fermions with electric and
magnetic dipole moments at finite temperature. We find that at one loop there
is an interaction term of the Chern-Simon form ${\cal L_I}=m_\mu\>A_\nu {\tilde
F}^{\mu\nu}$. The four vector $m_\mu \simeq d_i \mu_i m_i^2
~{\partial_\mu}\>(ln T)$ ... | 1992-10-17 | 2016-09-01 | [
"hep-ph"
] | Subhendra Mohanty, S.N.Nayak and Sarira Sahu |
hep-ph/9210241 | Phenomenological Aspects of Supersymmetric Standard Models without Grand
Unification | When the GUT relation on gaugino masses is relaxed, the mass and composition
of the lightest neutralino are different from those in the GUT case. We discuss
its phenomenological implications on the relic abundance of the neutralinos and
on superparticle searches. In particular, we focus on the case where the
neutral co... | 1992-10-16 | 2009-10-22 | [
"hep-ph"
] | Satoshi Mizuta, Daniel Ng and Masahiro Yamaguchi |
hep-ph/9210243 | How Effective is the Effective Potential? | Motivated by bubble nucleation in first order phase transitions, we question
the validity of the effective potential for inhomogeneous configurations. In an
attempt to get some insight into the importance of derivative terms, we analyze
a simple model, a kink in (1+1) dimensions and zero temperature. We evaluate
the en... | 1992-10-16 | 2014-11-17 | [
"hep-ph",
"hep-th"
] | Scott Dodelson and Ben-Ami Gradwohl |
hep-ph/9210240 | Gravitational Smearing of Minimal Supersymmetric Unification Predictions | A short and mean paper. | 1992-10-16 | 2013-11-13 | [
"hep-ph"
] | L.J. Hall and U. Sarid |
hep-ph/9210242 | Calculable Upper Limit on the Mass of the Lightest Higgs Boson in Any
Perturbatively Valid Supersymmetric Theory | We show that there is a calculable upper limit on the mass of the lightest
Higgs boson in any supersymmetric theory that remains perturbative up to a high
scale . There are no restrictions on the Higgs sector, or the gauge group or
particle content. We estimate the value of the upper limit to be $m_{\hcirc} <
146$ GeV ... | 1992-10-16 | 2009-10-22 | [
"hep-ph"
] | G.L. Kane, Chris Kolda, and James D. Wells |
hep-ph/9210238 | Proton Decay | The status of proton decay is described, including general motivations for
baryon number violation, and the present and future experimental situation.
Grand unification with and without supersymmetry is considered, including
possible evidence from coupling constant unification and implications for
proton decay and neut... | 1992-10-15 | 2007-05-23 | [
"hep-ph"
] | Paul Langacker |
hep-ph/9210237 | On an asymptotic estimate of the $n$-loop correction in perturbative QCD | A recently proposed method of estimating the asymptotic behaviour of QCD
perturbation theory coefficients is critically reviewed and shown to contain
numerous invalid mathematical operations and unsubstantiated assumptions. We
discuss in detail why this procedure, based solely on renormalization group
(RG) consideratio... | 1992-10-15 | 2016-08-14 | [
"hep-ph"
] | J.Ch\'yla, J.Fischer and P. Kol\'a\v{r} |
hep-ph/9210239 | Flavor Asymmetry of the Nucleon Sea: Consequences for Dilepton
Production | Parton distributions derived from a chiral quark model that generates an
excess of down quarks and antiquarks in the proton's sea satisfactorily
describe the measured yields of muon pairs produced in proton-nucleus
collisions. Comparison of dilepton yields from hydrogen and deuterium targets
promises greater sensitivit... | 1992-10-15 | 2009-05-05 | [
"hep-ph",
"nucl-th"
] | Estia J. Eichten, Ian Hinchliffe, and Chris Quigg |
hep-ph/9210234 | Post-Gaussian Varioational Method for the Nonlinear Schrodinger Equation | Gaussians to study soliton behavior and blowup in the nonlinear Schrodinger
equation in arbitrary dimension d and with arbitrary nonlinearity parameter
kappa | 1992-10-14 | 2009-10-22 | [
"hep-ph"
] | F.Cooper, H. Shepard, C Lucheroni and P. Sodano |
hep-ph/9210235 | Uncertainties in Coupling Constant Unification | The status of coupling constant unification in the standard model and its
supersymmetric extension are discussed. Uncertainties associated with the input
coupling constants, $m_{t}$, threshold corrections at the low and high scales,
and possible nonrenormalizable operators are parametrized and estimated. A
simple param... | 1992-10-14 | 2009-10-22 | [
"hep-ph"
] | Paul Langacker and Nir Polonsky |
hep-ph/9210236 | The SSC: Programme and Searches for New Particles | Talk presented at the Trieste Workshop on the Search for New Elementary
Particles: Status and Prospects. | 1992-10-14 | 2008-02-03 | [
"hep-ph"
] | Benjamin Grinstein |
hep-ph/9210233 | Spontaneously Broken Technicolor and the Dynamics of Virtual Vector
Technimesons | We propose spontaneously breaking technicolor, thus liberating techniquarks
and suppressing large resonance contributions to the electroweak $S$ parameter.
The dynamics is modeled by a fermion bubble approximation to a single massive
techni--gluon exchange potential. This contains a Nambu--Jona-Lasinio model
with addit... | 1992-10-13 | 2009-10-22 | [
"hep-ph"
] | Christopher T. Hill, Dallas C. Kennedy, Tetsuya Onogi, Hoi--Lai Yu |
hep-ph/9210231 | ETC With a GIM Mechanism | We construct an extended technicolor model of quarks and leptons which
preserves a GIM mechanism. Furthermore, there is only a minimal technicolor
sector, in accordance with recent precision measurements of electroweak
parameters. We also show how to incorporate custodial SU(2) and massless
neutrinos into such a model. | 1992-10-13 | 2009-09-15 | [
"hep-ph"
] | L. Randall |
hep-ph/9210232 | Testing ETC Generation of the Top Quark Mass | We consider constraints on models in which a top quark mass is generated
through unenhanced extended technicolor interactions. The deviation in the
$\rho$ parameter from unity and $B$--$\overline{B}$ mixing could be large, but
given the uncertainties in strong dynamics and variations in the parameters of
models, no con... | 1992-10-13 | 2009-09-15 | [
"hep-ph"
] | L. Randall |
hep-ph/9210230 | Observing Electroweak Symmetry Breaking at the SSC | In this talk we survey the SSC signals and backgrounds for the physics of
electroweak symmetry breaking. We study the process $pp \rightarrow WWX$ and
compute the rate for the ``gold-plated'' signals $W^\pm \rightarrow \ell^\pm
\nu$ and $Z \rightarrow \ell^+\ell^-$ $(\ell = e,\mu)$ for a wide variety of
models. We use ... | 1992-10-13 | 2009-10-22 | [
"hep-ph"
] | Jonathan A. Bagger |
hep-ph/9210228 | Improving the Effective Potential | A general procedure is presented how to improve the effective potential by
using the renormalization group equation (RGE) in MS bar scheme. If one knows
the L-loop effective potential and the RGE coefficient functions up to
(L+1)-loop level, this procedure gives an improved potential which satisfies
the RGE and contain... | 1992-10-12 | 2009-10-22 | [
"hep-ph"
] | Masako Bando, Taichiro Kugo, Nobuhiro Maekawa and Hiroaki Nakano |
hep-ph/9210229 | Improving the Effective Potential:Multi-Mass-Scale Case | Previously proposed procedure for improving the effective potential by using
renormalization group equation (RGE) is generalized so as to be applicable to
any system containing several different mass scales. If one knows L-loop
effective potential and (L+1)-loop RGE coefficient functions, this procedure
gives an improv... | 1992-10-12 | 2017-02-01 | [
"hep-ph"
] | Masako Bando, Taichiro Kugo, Nobuhiro Maekawa and Hiroaki Nakano |
hep-ph/9210227 | Computing Spectral Densities in Finite Temperature Field Theory | Convenient Cutkosky-like diagrammatic rules for computing the spectral
densities of arbitrary two-point correlation functions in finite temperature
field theory are derived. The approach is based on an explicit analytic
continuation of imaginary-time Feynman diagrams and avoids the complications of
real-time finite tem... | 1992-10-10 | 2009-10-22 | [
"hep-ph"
] | Sangyong Jeon |
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