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/9405207
$|V_{cb}|$ from OPE Sum Rules for Heavy Flavor Transitions
We derive a model-independent upper bound for the axial-vector form factor of the $B\ra D^*$ transition at zero recoil, $F_{B\ra D^*}$. The form factor turns out to be noticeably less than unity. The deviation of $F_{B\ra D^*}$ from unity is larger than previously anticipated. Using our estimate we extract $|V_{cb}|$ f...
1994-05-03
2014-11-17
[ "hep-ph" ]
M. Shifman, N.G. Uraltsev and A. Vainshtein
hep-ph/9405213
From Kondo Model and Strong Coupling Lattice QCD to the Isgur-Wise Function
Isgur-Wise functions parametrise the leading behaviour of weak decay form factors of mesons and baryons containing a single heavy quark. The form factors for the quark mass operator are calculated in strong coupling lattice QCD, and Isgur-Wise functions extracted from them. Based on renormalisation group invariance of ...
1994-05-03
2007-05-23
[ "hep-ph", "hep-lat", "hep-th" ]
Apoorva Patel
hep-ph/9404362
Model-Independent $Z'$ Limits from Electron-Electron Collisions
Model independent constraints on the mass of an extra neutral gauge boson and its couplings to charged leptons are given for the $e^-e^-$ option of a future linear collider. Analytic exclusion limits are derived in the Born approximation. The results are compared with those of the $e^+e^-$ mode. The influence of radiat...
1994-05-02
2009-10-28
[ "hep-ph" ]
D. Choudhury, F. Cuypers, A. Leike
hep-ph/9405203
CP violation in photon-photon collisions
The effective lagrangian parametrization is used to determine the CP violating effects in $ \gamma \gamma $ collisions. for the processes studied the effects are found to be very small, the one exception being scalar production.
1994-05-02
2015-06-25
[ "hep-ph" ]
Jose Wudka
hep-ph/9404360
Supergravity Solutions in the Low-$\tan\beta$ $ \lambda_t$ Fixed Point Region
There has been much discussion in the literature about applying the radiative electroweak symmetry breaking (EWSB) requirement to GUT models with supergravity. We motivate and discuss the application of the EWSB requirement to the low $\tan\beta$ fixed-point region and describe the solutions we find.
1994-05-02
2007-05-23
[ "hep-ph" ]
V. Barger, M.S. Berger and P. Ohmann
hep-ph/9405205
The Chiral Lagrangian Approach to the Non-universal Effects in the Zbb Vertex
We calculate the top quark loop corrections to the Zbb vertex in the chiral lagrangian of the dynamical electroweak symmetry breaking theory. We use the effective lagrangian based on coset space SU(2) X U(1) / U(1) with the gauge interactions switched off, so these corrections are directly related to the Physics associ...
1994-05-02
2009-10-28
[ "hep-ph" ]
X. Zhang
hep-ph/9404361
Dynamical Breakdown of Chirality and Parity in (2+1)-dimensional QED
In the (2+1)-dimensional QED with and without the Chern-Simons term, we find the non-local gauge in which there is no wavefunction renormalization for the fermion in the framework of the Schwinger-Dyson equation. By solving the Schwinger-Dyson equation in the non-local gauge, we find a finite critical value $N_f^c$ for...
1994-05-02
2009-10-28
[ "hep-ph" ]
Kei-Ichi Kondo, Toru Ebihara, Takuya Iizuka and Eiji Tanaka
hep-ph/9404363
Monopoles and Quark Confinement: Introduction and Overview
We (try to) pedagogically explain how monopoles arise in QCD, why maximal Abelian(MA) gauge is ``special'' for monopole study, the Abelian projection in MA gauge, its resultant degrees of freedom(photons, monopoles and charged matter fields), and the QCD-equivalent action in terms of these degrees of freedom. Then we t...
1994-05-02
2011-04-15
[ "hep-ph", "hep-lat" ]
Ken Yee
hep-ph/9405201
About the relevance of the Imaginary components of the effective couplings in the Asymmetry measurements
The effect coming from imaginary parts of effective couplings in the $e^+ e^-$ asymmetries is investigated. It is shown that for the present level of experimental accuracy, in some asymmetries the imaginary parts of the effective couplings cannot be neglected and moreover that the use of different prescriptions on how ...
1994-05-02
2009-10-28
[ "hep-ph" ]
M.Martinez and F.Teubert
hep-ph/9405204
Normalization of QCD corrections in top quark decay
We discuss the effects of QCD corrections to the on-shell decay $t \to b W$. We resolve the scale ambiguity using the Brodsky-Lepage-Mackenzie scheme, and find that the appropriate coupling constant is $\alpha_{s}^{ \overline{MS}} (0.122m_{t})$. The largest long distance contribution comes from the definition of the on...
1994-05-02
2009-10-28
[ "hep-ph" ]
Brian H. Smith and M.B. Voloshin
hep-ph/9405202
Calculation of $<p|\overline{u}u-\overline{d}d|p>$ from QCD sum rule and the neutron-proton mass difference
The proton matrix element of the isovector-scalar density, $<p|\overline{u}u-\overline{d}d|p>/2M_p$, is calculated by evaluating the nucleon current correlation function in an external isovector-scalar field using the QCD sum-rule method. In addition to the usual chiral and gluon condensates of the QCD vacuum, the resp...
1994-05-02
2009-10-28
[ "hep-ph" ]
X. Jin, M. Nielsen and J. Pasupathy
hep-ph/9405206
Effective Lagrangians (for electroweak physics)
In this set of lectures I will present an elementary introduction to the uses of effective lagrangians in the electroweak interaction with emphasis in practical applications
1994-05-02
2007-05-23
[ "hep-ph" ]
Jose Wudka
hep-ph/9404358
Perturbation Theory and Relative Space
The validity of non-perturbative methods is questioned. The concept of relative space is introduced.
1994-05-01
2011-04-15
[ "hep-ph" ]
M. Veltman
hep-ph/9404359
Higgs Decay to Top Quarks at Hadron Colliders
Higgs bosons which decay principally to top quarks, such as in the minimal supersymmetric model, produce a peak-dip structure in the $gg\to t\bar t$ invariant-mass spectrum. This structure is potentially observable at the CERN Large Hadron Collider. (see BNL theory home page http://penguin.phy.bnl.gov/bnl.html for rece...
1994-05-01
2009-10-28
[ "hep-ph" ]
D. Dicus, A. Stange and S. Willenbrock
hep-ph/9404357
Nonequilibrium Quantum Dynamics Of Disoriented Chiral Condensates
The nonequilibrium dynamics of the chiral phase transition expected during the expansion of the quark-qluon plasma produced in a high energy hadron or heavy ion collision is studied in the O(4) linear sigma model to leading order in a large $N$ expansion. Starting from an approximate equilibrium configuration at an ini...
1994-04-29
2009-10-28
[ "hep-ph" ]
Fred Cooper, Yuval Kluger, Emil Mottola, Juan Pablo Paz
hep-ph/9404353
Chiral Symmetry Aspects of the Scalars
Electromagnetic decays of the scalar mesons are shown to be constrained by chiral symmetry as a consequence of the fact that, in the chiral limit, the two and three-point functions $<SS-PP>$ and $<VVS>$ satisfy super-convergent dispersion relations. The QCD asymptotic behavior of the latter is canonical and it can be s...
1994-04-29
2009-09-25
[ "hep-ph" ]
B. Moussallam and J. Stern
hep-ph/9404354
Degenerate Neutrinos in Left Right Symmetric Theory
Various hints on the neutrino masses namely, ({\em i}) the solar neutrino deficit ({\em ii}) the atmospheric neutrino deficit ({\em iii}) the need for the dark matter and/or ({\em iv}) the non-zero neutrinoless double beta decay collectively imply that all the three neutrinos must be nearlty degenerate. This feature ca...
1994-04-29
2009-10-28
[ "hep-ph" ]
Anjan S. Joshipura (Physical Research Lab.)
hep-ph/9404355
Light Gluinos and the Parton Structure of the Nucleon
We study the effects of light gluinos with mass below about 1 GeV on the nucleon parton densities and the running of alpha_(S). It is shown that from the available high-statistics DIS data no lower bound on the gluino mass can be derived. Also in the new kinematical region accessible at HERA the influence of such light...
1994-04-29
2009-10-28
[ "hep-ph" ]
R. Rueckl and A. Vogt (Univ. Munich)
hep-ph/9404356
Baryon - Antibaryon Production by Disordered Chiral Condensates
We investigate the production of baryons and antibaryons in the central rapidity region of high energy nuclear collisions within the framework of the Skyrme model taking into account the effects of explicit chiral symmetry breaking. We argue that the formation of disordered chiral condensates may lead to enhanced baryo...
1994-04-29
2009-10-28
[ "hep-ph", "nucl-th" ]
Joseph I. Kapusta and Ajit M. Srivastava
hep-ph/9404350
A New Treatment of Neutrino Oscillations in Medium
A new more rigorous and accurate method for treating neutrino oscillations in the context of the MSW effect in a medium is proposed. This leads to a new type of resonance condition which for small mixing angles puts rather stringent conditions on $E_{\nu}/\delta {m^2}$. The implications on the solar neutrino problem ar...
1994-04-28
2009-09-25
[ "hep-ph" ]
G.K. Leontaris and J. D. Vergados
hep-ph/9404351
High Energy Hadron-Hadron Scattering
The elastic hadron-hadron scattering at high energies is one of the most fundamental subjects of all particle physics problems and yet is least understood in spite of many advances in quantum chromodynamics (QCD) at the conceptual level. We review here the recent theoretical and experimental status of the subject as we...
1994-04-28
2008-02-03
[ "hep-ph", "nucl-th" ]
Kyungsik Kang
hep-ph/9404352
Big Bang Baryogenesis
An overview of baryogenesis in the early Universe is presented. The standard big bang model including big bang nucleosynthesis and inflation is breifly reviewed. Three basic models for baryogenesis will be developed: The ``standard" out-of-equilibrium decay model; the decay of scalar consensates along flat directions i...
1994-04-28
2015-06-25
[ "hep-ph", "astro-ph" ]
Keith A. Olive
hep-ph/9404346
$B_c$--meson production in hadron--hadron collisons
The $B_c$--meson production cross section was calculated in the perturbative QCD. Various distributions of the charged leptons from the $B_c \to l \nu J/\psi(\to l^+ l^-)$ decay were obtained. The $B_c$--meson mass measurement from such decays is also discussed.
1994-04-28
2009-09-25
[ "hep-ph" ]
S. R. Slabospitsky
hep-ph/9404349
Flavor mixing in the gluino coupling and the nucleon decay
Flavor mixing in the quark-squark-gluino coupling is studied for the minimal SU(5) SUGRA-GUT model and applied to evaluation of the nucleon lifetime. All off-diagonal (generation mixing) elements of Yukawa coupling matrices and of squark/slepton mass matrices are included in solving numerically one-loop renormalization...
1994-04-28
2010-11-01
[ "hep-ph" ]
Toru Goto, Takeshi Nihei and Jiro Arafune
hep-ph/9404348
Minijet Production at Small x
Soft pomeron exchange at high energy includes minijet production at central rapidity values. This predicts copious production of minijets in deep inelastic scattering at small $x$, which is closely related to the fact that $\nu W_2$ exhibits Regge behaviour. It helps to explain also how the integrated inclusive cross-s...
1994-04-28
2011-07-19
[ "hep-ph" ]
A Donnachie and P V Landshoff
hep-ph/9404342
The Search for Top Squarks at the Fermilab Tevatron Collider
The lighter superpartner of the top quark ($\tt_1$) may be considerably lighter than squarks of the first two generations, and hence may be accessible to Tevatron collider searches, even if the other squarks and the gluino are too heavy. For the range of $m_{\tt_1}$ of interest at the Tevatron, the $\tt_1$ decays to a ...
1994-04-27
2009-10-28
[ "hep-ph" ]
H. Baer, J. Sender and X. Tata
hep-ph/9404343
Determining the CP-eigenvalues of the Neutral Higgs Bosons of the Minimal Supersymmetric Model in $\gam\gam$ Collisions
We determine the optimal laser and $\ep/\em$ energies and polarizations for {\it directly} determining the CP eigenvalue of each of the neutral Higgs bosons of the Minimal Supersymmetric Model via measurement of transverse polarization cross section asymmetry in back-scattered laser photon collisions. Approximate stati...
1994-04-27
2010-11-01
[ "hep-ph" ]
J.F. Gunion and J.G. Kelly
hep-ph/9404344
Higgs Production in $SU(2)_c$ Symmetric Interactions
We study the sensitivity of Higgs production and decay processes to the $SU(2)_c$ symmetric couplings $O_W$ and $O_{UW}$. Remarkable results are obtained in the case of $\gamma \gamma \to H$ and for certain ratios of Higgs decay widths. We also discuss and complete previous results on unitarity constraints for such cou...
1994-04-27
2009-10-28
[ "hep-ph" ]
G.J. Gounaris, J. Layssac, F.M. Renard
hep-ph/9404345
Representations of General Dimension for the Skyrme Model
We construct the representations of general dimension for the soliton solution to the $SU(2)$ Skyrme model, and show that at the classical level the dependence on the dimension of the representation ($2j+1$) appears only as an overall factor $j(j+1)(2j+1)$ in the Lagrangian density, which may be absorbed by a rescaling...
1994-04-27
2009-10-28
[ "hep-ph" ]
E. Norvai\v{s}as, D.O. Riska
hep-ph/9404347
Precise Vacuum Stability Bound in the Standard Model (addendum)
This is an addendum to the paper of the above title published in Physics Letters B317, 159 (1993). In that paper, I found the lower bound to the Higgs mass as a function of the top quark mass one obtains by requiring that the standard model vacuum be stable. It included all higher order corrections to two-loops, precis...
1994-04-27
2007-05-23
[ "hep-ph" ]
Marc Sher
hep-ph/9404339
Constraints on Neutrino-Neutrino Interactions from Primordial Nucleosynthesis
We use the constraints arising from primordial nucleosynthesis to bound the strength $F$ of non-standard neutrino-neutrino interactions, when the right-handed neutrinos participate in the interaction. We find $F < 3 \times 10^{-3}\ G_F$, which is five orders of magnitude more stringent than the limit obtained using LEP...
1994-04-26
2009-10-28
[ "hep-ph", "astro-ph" ]
Eduard Mass\'o and Ramon Toldr\`a
hep-ph/9404338
$e^+e^-\to b\bar bW^+W^-$ at the Next Linear Collider, Top-Pairs and Higgs Production
The complete matrix element for $e^+e^-\ar W^+W^-\bar b b$ is computed at tree level and applied to: {\bf a)} $\bar t t$ production and decay ; {\bf b)} $ZH$ production followed by $Z\ar \bar bb$ and $H\ar WW$. In both cases we include finite width effects and all irreducible backgrounds.
1994-04-26
2009-10-28
[ "hep-ph" ]
A. Ballestrero, E. Maina and S. Moretti (U. of Torino)
hep-ph/9404340
New Upper Limit for the Branching Ratio of the Omega- to Xi- gamma Radiative Decay
We have searched for the rare hyperon radiative decay Omega- to Xi- gamma, using the Fermilab Proton Center 375 GeV/c charged hyperon beam. Our measurement of the Omega- beam fraction at 13.6 m from production is (4.8 +_ 0.4)10**(-5). No signal was found and we determine a new upper limit of (4.6 x 10**-4) at 90% CL fo...
1994-04-26
2009-09-25
[ "hep-ph", "hep-ex" ]
I. F. Albuquerque, et al. (E761 Collaboration)
hep-ph/9404337
Vector Mesons in Nuclear Medium -- an Effective Lagrangian Approach --
Effective masses of $\rho$ and $\omega$ mesons in nuclear medium are studied in a hadronic effective theory. Both the pole position and the screening mass decrease in nuclear matter due to the polarization of the nucleon Dirac sea. The physical origin of the decrease is a reduction of the wave function renormalization ...
1994-04-26
2009-10-28
[ "hep-ph", "nucl-th" ]
H. Shiomi and T. Hatsuda
hep-ph/9404341
Neutrino Magnetic Moment and the Process $\nu e \rightarrow \nu e \gamma$
The contribution of a neutrino magnetic moment $\mu_{\nu}$ to the cross section of the process $\nu e^{-}\rightarrow \nu e^{-} \gamma $ has been calculated and compared with the Standard Electroweak one. The radiative process allows to reach low enough values of $Q^2$ without the need to operate at very small energies ...
1994-04-26
2016-09-01
[ "hep-ph" ]
J. Bernab\'eu, S.M. Bilenky, F.J. Botella and J. Segura
hep-ph/9404334
Gauge Hierarchy, Planck Scale Corrections And The Origin of GUT Scale In Supersymmetric $(SU(3))^3$
Within a supersymmetric unified framework we explore the resolution of the gauge hierarchy problem taking account of the non-renormalizable terms in the superpotential. For $[SU(3)]^3$ supplemented by a discrete R parity, we find the remarkable property that the vacuum configuration corresponding to the correct gauge s...
1994-04-25
2011-05-12
[ "hep-ph" ]
G. Dvali and Q. Shafi
hep-ph/9404331
Renormalization of 4-Quark Operators and QCD-Sum Rules
We compute the renormalization mismatch displayed in 1--loop approximation by classically equivalent 4-quark operators and coming from different possible definitions of the $\gamma_5$ matrix in dimensional regularization. The result is then employed to study the effect of the various treatments of $\gamma_5$ upon the s...
1994-04-25
2009-10-28
[ "hep-ph" ]
L.-E. Adam and K.G. Chetyrkin
hep-ph/9404335
Production of Weak Bosons and Higgs Bosons at e-e- Colliders
We present calculations of cross sections for single $W^-$ and $Z$ production and $W^-W^-, W^-Z, W^-\gamma, ZZ$, and $W^+W^-$ pair production within the Standard Model at $e^-e^-$ linear colliders. We evaluate Standard-Model Higgs boson production in the channels $e^-e^- \to e^-e^- H$, $e^-\nu W^- H$, and $e^-e^- ZH$. ...
1994-04-25
2009-09-25
[ "hep-ph" ]
V.Barger, J.F.Beacom, Kingman Cheung, and T.Han
hep-ph/9404336
More on direct CP violation in b -> d + J/psi decays
Direct CP violation can occur in B-meson decays of the type b -> d+c+cbar, where the charm-anticharm pair forms a J/psi. The CP asymmetry requires the contribution to the amplitude from decays into other states, which rescatter into d+J/psi via final state interactions. In particular, states with the same quark content...
1994-04-25
2010-11-01
[ "hep-ph" ]
Joao M. Soares
hep-ph/9404332
Orsay lectures on confinement (II)
The behaviour of the light quark vacuum in the presence of a heavy quark is investigated.
1994-04-25
2007-05-23
[ "hep-ph" ]
V. N. Gribov
hep-ph/9404333
Evidence for Bosonic Electroweak Corrections in the Standard Model
We present strong indirect evidence for the contribution of bosonic electroweak corrections in the Standard Model. Although important conceptually, these corrections give subleading contributions in current high energy experiments, and it was previously thought that they are difficult to detect. We also discuss the sep...
1994-04-25
2009-10-28
[ "hep-ph" ]
P. Gambino and A. Sirlin
hep-ph/9404330
CP Violation in {\boldmath $H \ra t \overline{t}$} Decays at {\boldmath $\epem$} Colliders
A helicity asymmetry for top quarks originating from Higgs boson decays is investigated within the 2-Higgs Doublet Model. The asymmetry is sensitive to CP violation in the scalar sector of the model, whereas it vanishes in the Standard Model. It has been checked that without any fine tuning of parameters the asymmetry ...
1994-04-24
2010-11-01
[ "hep-ph" ]
B. Grzadkowski
hep-ph/9404326
QCD Instantons in Vacuum and Matter
The singlet coupling to the topological charge density in the instanton vacuum, causes the instantons and antiinstantons to be screened over distances of the order of 1/2 fm. Dilute instanton systems behave as a free gas, while dense instanton systems behave as a plasma. The free gas behaviour is favored by a density o...
1994-04-23
2009-10-28
[ "hep-ph" ]
I. Zahed
hep-ph/9404327
First Evidence for Electroweak Radiative Corrections from the New Precision Data
The analysis of the newest data on the leptonic $Z$-decays and $m_W$ appears to reveal the first manifestations of electroweak radiative corrections. In fact, these data differ, at the level of $2\sigma$, from their electroweak Born values, while they agree, to within $1\sigma$, with the theoretical values which take...
1994-04-23
2008-11-26
[ "hep-ph" ]
V.A. Novikov, L.B. Okun, A.N. Rozanov and M.I. Vysotsky
hep-ph/9404329
Solar Neutrinos: Hint for Neutrino Mass
The present status of the solar neutrino problem is reviewed. The strongest motivation for new neutrino physics comes from the complete phenomenological failure of astrophysical solutions: (1) The standard solar model is excluded by each of the solar neutrino experiments. (2) The combined results of Homestake and Kamio...
1994-04-23
2016-09-01
[ "hep-ph", "astro-ph" ]
Naoya Hata
hep-ph/9404325
Where the excess photons and dileptons in SPS nuclear collisions come from?
Recently the first single photon spectra from CERN energy heavy-ion collisions were reported by WA80, while NA34/3 and NA38 have obtained the spectra for dileptons with the mass up to 4-5 GeV. The production rates for photons and dileptons significantly increase when reactions involving the $A_1$ meson are included. Ho...
1994-04-22
2009-10-28
[ "hep-ph", "nucl-th" ]
E. V. Shuryak and L. Xiong
hep-ph/9404324
The Proximal Chiral Phase Transition
We consider the form of the chiral symmetry breaking piece of the effective potential in the linear sigma model. Surprisingly, it allows for a second local minimum at both zero and finite temperature. Even though chiral symmetry is not exact, and therefore is not restored in a true phase transition at finite temperatur...
1994-04-22
2009-10-28
[ "hep-ph", "nucl-th" ]
Joseph I. Kapusta and Ajit M. Srivastava
hep-ph/9404322
Higher Twist Effects in the Drell-Yan Angular Distribution
We study the Drell-Yan process $\pi N \rightarrow \mu^+ \mu^- X$ at large $x_F$ using perturbative QCD. A higher-twist mechanism suggested by Berger and Brodsky is known to qualitatively explain the observed $x_F$ dependence of the muon angular distribution, but the predicted large $x_F$ behavior differs quantitatively...
1994-04-22
2009-10-28
[ "hep-ph" ]
K.J. Eskola, P. Hoyer, M. V\"anttinen and R. Vogt
hep-ph/9404328
Sphalerons and Large Order Behavior of Perturbation Theory in Lower Dimension
Sphalerons -- unstable static solutions of classical field equations in (d+1)-dimensional space-time -- may be viewed as euclidean solutions in d dimensions. We discuss their role in the large order asymptotics of the perturbation theory. Specifically, we calculate their contribution to the large order behaviour of the...
1994-04-22
2009-10-28
[ "hep-ph" ]
V.A.Rubakov and O.Yu.Shvedov
hep-ph/9404323
The Physics of Z' bosons
In these lectures we review the simplest gauge extensions of the standard model, and the present and future limits on new weak interactions.
1994-04-22
2011-04-15
[ "hep-ph" ]
F. del Aguila
hep-ph/9404311
Cosmological Constant and Soft Terms in Supergravity
Some of the soft SUSY breaking parameters in hidden sector supergravity model depend on the expectation value of the hidden sector scalar potential, $<V_h>$, whose tree level value is equal to the tree level cosmological constant. The current practice of calculating soft parameters assumes that $<V_h>=0$. Quantum corre...
1994-04-21
2009-10-28
[ "hep-ph", "hep-th" ]
Kiwoon Choi, Jihn E. Kim and Hans Peter Nilles
hep-ph/9404317
Chiral Invariance of Massive Fermions
We show that a massive fermion theory, while not invariant under the conventional chiral transformation, is invariant under a $m$-deformed chiral transformation. These transformations and the associated conserved charges are nonlocal but reduce to the usual transformations and charges when $m=0$. The $m$-deformed charg...
1994-04-21
2015-06-25
[ "hep-ph", "hep-th" ]
A. Das and M. Hott
hep-ph/9404313
All electroweak four fermion processes in electron-positron collisions
This paper studies the electroweak production of all possible four fermion states in e+ e- collisions. Since the methods employed to evaluate the complete matrix elements and phase space are very general, all four fermion final states in which the charged particles are detected can be considered. Also all kinds of expe...
1994-04-21
2009-10-28
[ "hep-ph" ]
F.A.Berends, R.Kleiss and R.Pittau
hep-ph/9404318
Is \lq\lq Heavy Quark Damping Rate Puzzle'' in Hot QCD Really the Puzzle?
Within the framework of perturbative resummation scheme of Pisarski and Braaten, the decay- or damping-rate of a moving heavy quark (muon) to leading order in weak coupling in hot QCD (QED) is examined. Although, as is well known, the conventionally-defined damping rate diverges logarithmically at the infrared limit, s...
1994-04-21
2014-11-17
[ "hep-ph" ]
A. Ni\'egawa
hep-ph/9404320
Low Energy Skyrmion-Skyrmion Scattering
We study the scattering of Skyrmions at low energy and large separation using the method proposed by Manton of truncation to a finite number of degrees freedom. We calculate the induced metric on the manifold of the union of gradient flow curves, which for large separation, to first non-trivial order is parametrized by...
1994-04-21
2007-05-23
[ "hep-ph" ]
T. Gisiger and M. B. Paranjape
hep-ph/9404314
A Review of Hadronic and Rare B Decays
We review recent experimental results on B meson decays. These include measurements of the inclusive production of charmed and non-charmed mesons and baryons, the reconstruction of a large number of exclusive hadronic final states with charmed mesons, the search for exclusive hadronic final states without charmed meson...
1994-04-21
2016-11-03
[ "hep-ph", "hep-ex" ]
Thomas E. Browder (University of Hawaii at Manoa), Klaus Honscheid (Ohio State University), Stephen Playfer (Syracuse University)
hep-ph/9404312
Exact Multiparticle Amplitudes at Threshold in Large-N Component phi^4 Theory
I derive the set of recurrence relations between the amplitudes of multiparticle production at threshold in the standard large-N limit of the O(N)-symmetric phi^4$ theory which sums all relevant diagrams with arbitrary number of loops. I find an exact solution to the recurrence relations using the Gelfand--Dikii repres...
1994-04-21
2013-11-13
[ "hep-ph", "hep-th" ]
Yu. Makeenko
hep-ph/9404319
Low Energy Nucleon-Nucleon Scattering with the Skyrme Model in the Geodetic Approximation
We calculate nucleon-nucleon scattering at low energies and large impact parameter in the Skyrme model within the framework for soliton scattering proposed by Manton. This corresponds to a truncation of the degrees of freedom to the twelve collective coordinates which essentially describe the rigid body motion of the p...
1994-04-21
2010-11-01
[ "hep-ph", "hep-th" ]
T. Gisiger and M.B. Paranjape
hep-ph/9404315
A New Bottom-Up Approach for the Construction of Fermion Mass Matrices
We describe a new technique which enables one to construct an SO(10)-symmetric fermion mass matrix model at the supersymmetric grand unification scale directly from the fermion mass and mixing data at the low energy scale. Applications to two different neutrino mass and mixing scenarios are given.
1994-04-21
2007-05-23
[ "hep-ph" ]
Carl H. Albright and Satyanarayan Nandi
hep-ph/9404316
The Solar Neutrino Problem: Neither Astrophysics Nor Oscillations?
There is no consistent solar model which can describe all experimental data on the solar neutrinos. The problem can be formulated essentially in a model independent way. The key points are the comparison of the Homestake and the Kamiokande data as well as the comparison of the GALLEX and SAGE results with minimal signa...
1994-04-21
2009-09-25
[ "hep-ph" ]
Alexei Yu. Smirnov
hep-ph/9404303
Chiral phase transition in an expanding quark antiquark plasma
We investigate the time evolution of a quark antiquark plasma by solving numerically the relativistic transport equations derived on the Hartree level from the Nambu-Jona-Lasinio model. We find that the phase transition in the expanding quark antiquark plasma is different as compared to that in a static plasma. The exp...
1994-04-20
2009-10-28
[ "hep-ph" ]
Abdellatif Abada and Joerg Aichelin
hep-ph/9404306
On the Significance of the Electroweak Precision Data
We elaborate on a recently suggested effective Lagrangian for charged-current and neutral-current electroweak interactions which in comparison with the standard electroweak theory contains three free parameters $\Delta x, \Delta y$, $\varepsilon$ which quantify different sources for violations of $SU(2)$ symmetry. With...
1994-04-20
2009-10-28
[ "hep-ph" ]
S. Dittmaier, D. Schildknecht, K. Kolodziej, M. Kuroda
hep-ph/9404309
Chiral Meson Lagrangians from the QCD Based NJL Model Modified by Nonlocal Effects
Starting from a QCD inspired bilocal quark interaction we obtain a local effective meson lagrangian. In contrast to previous local (NJL-like) approaches, we include nonlocal corrections related to the finite meson size which we characterize by a small parameter. After bosonization using the heat-kernel method we predic...
1994-04-20
2007-05-23
[ "hep-ph" ]
A.A.Bel'kov, A.V.Lanyov, A.Schaale, S.Scherer
hep-ph/9404304
Search for the Invisibly Decaying Higgs Particle at LEP and the LHC
The Higgs particle can have dominantly invisible decay in a large class of Majoron models as well as some SUSY models. The LEP signal and mass limit for a Higgs particle undergoing invisible decay are explored. They are found to be very similar to those for the standard model decay. The best signatures and discovery li...
1994-04-20
2009-09-25
[ "hep-ph" ]
D.P.Roy
hep-ph/9404308
Semi-Empirical Bound on the Chlorinr-37 Solar Neutrino Experiment
The Kamiokande measurement of energetic Boron-8 neutrinos from the sun is used to set a lower bound on the contribution of the same neutrinos to the signal in the \Chlorine\ experiment. Implications for Beryllium-7 neutrinos are discussed.
1994-04-20
2009-09-25
[ "hep-ph" ]
Waikwok Kwong and S.P. Rosen
hep-ph/9404307
A Transient New Coherent Condition of Matter: The Signal for New Physics in Hadronic Diffractive Scattering
We demonstrate the existence of an anomalous structure in the data on the diffractive elastic scattering of hadrons at high energies and small momentum transfer. We analyze five sets of experimental data on $p(\overline{p})-p $ scattering from five different experiments with colliding beams, ranging from the first-- an...
1994-04-20
2009-10-28
[ "hep-ph" ]
S. Barshay and P. Heiliger
hep-ph/9404310
A Measurement of the Branching Fraction ${\cal B} \tau^+ \to h^- \pi^0 \nu_\tau$
Using data from the CLEO II detector at CESR, we measure ${\cal B}(\tau^\pm\rightarrow h^\pm\pi^0\nu_\tau)$ where $h^\pm$ refers to either $\pi^\pm$ or $K^\pm$. We use three different methods to measure this branching fraction. The combined result is ${\cal B}(\tau^\pm\rightarrow h^\pm\pi^0\nu_\tau) = 0.2587 \pm 0.0012...
1994-04-20
2012-08-27
[ "hep-ph", "hep-ex" ]
The CLEO collaboration
hep-ph/9404302
Electroweak Baryogenesis and Standard Model CP Violation
We analyze the mechanism of electroweak baryogenesis proposed by Farrar and Shaposhnikov in which the phase of the CKM mixing matrix is the only source of $CP$ violation. This mechanism is based on a phase separation of baryons via the scattering of quasiparticles by the wall of an expanding bubble produced at the elec...
1994-04-20
2010-11-01
[ "hep-ph" ]
Patrick Huet and Eric Sather
hep-ph/9404321
Leptoquark Pair Production at $ep$ Colliders
The pair production cross section for scalar and vector leptoquarks at $ep$ colliders is calculated for the case of photon--gluon fusion. In a model independent analysis we consider the most general $C$ and $P$ conserving couplings of gluons and photons to both scalar and vector leptoquarks described by an effective lo...
1994-04-20
2015-06-25
[ "hep-ph" ]
Johannes Bl\"umlein, Edward Boos, and Alexander Pukhov
hep-ph/9404305
Renormalization of Heavy Quark Effective Field Theory: Quantum Action Principles and Equations of Motion
We discuss the quantum action principles and equations of motion for Heavy Quark Effective Field Theory. We prove the so-called equivalence theorem for HQEFT which states that the physical predictions of HQEFT are independent from the choice of interpolating fields. En passant we point out that HQEFT is in fact more su...
1994-04-20
2009-10-28
[ "hep-ph" ]
Wolfgang Kilian and Thorsten Ohl
hep-ph/9404296
Heavy Quark Masses, Mixing Angles, and Spin-Flavour Symmetry
In a series of three lectures, I review the theory and phenomenology of heavy quark masses and mixing angles and the status of their determination. In addition, I give an introduction to heavy quark symmetry, with the main emphasis on the development of heavy quark effective field theory and its application to obtain a...
1994-04-19
2016-10-26
[ "hep-ph" ]
M. Neubert
hep-ph/9404288
Double radiative decay $Z \rightarrow f\bar{f}\gamma\gamma$ in the Standard Model
Z-boson decay $Z \rightarrow f\tilde{f}\gamma\gamma$ in the Standard Model is analysed. The distribution function on the invariant masses of the photon and fermion pairs is calculated in the leading logarithmic approximation. It is shown that this distribution function has a specific shape of a ``crest''. (To be publis...
1994-04-19
2015-06-25
[ "hep-ph" ]
N.V.Mikheev and A.Ya.Parkhomenko
hep-ph/9404297
Implications of Supersymmetric Grand Unification
Unification of the interactions of the Standard Model is possible in its simplest supersymmetric extension. The implications of the $\lambda _t$ fixed-point solution on the top mass and on Higgs phenomenology is discussed. Expected correlations between the masses of various supersymmetric particles are detailed.
1994-04-19
2007-05-23
[ "hep-ph" ]
V. Barger, M.S. Berger and P. Ohmann
hep-ph/9404287
DISJET 1.2: A Monte Carlo Program for Jet Cross Section Calculations in Deep Inelastic Scattering
We present a new parton level Monte Carlo program for the calculation of jet cross sections in Deep Inelastic Scattering based on Born and next-to-leading order matrix elements. Using a class of invariant jet definition schemes, the program allows for the calculation of differential distributions of jet cross sections ...
1994-04-19
2008-02-03
[ "hep-ph" ]
T. Brodkorb and E. Mirkes
hep-ph/9404290
Electromagnetic catalysis of the radiative transitions of $\nu_i \rightarrow \nu_j \gamma$ type in the field of an intense monochromatic wave
The radiative decay of the massive neutrino $\nu_i \rightarrow \nu_j \gamma$ in a circularly polarized electromagnetic wave is investigated within the Standard theory with lepton mixing. The decay probability in the wave field does not contain a threshold factor $\sim ( 1 - m_i / m_j )$ as opposed to the decay probabil...
1994-04-19
2009-10-28
[ "hep-ph" ]
A.A.Gvozdev, N.V.Mikheev and L.A.Vassilevskaya
hep-ph/9404295
Leptonic Signals from off-shell Z Boson Pairs at Hadron Colliders
We study the gluon fusion into pairs of off-shell Z bosons and their subsequent decay into charged lepton pairs at hadron colliders. We do not restrict the intermediate state Z bosons to the narrow width approximation but allow for arbitrary invariant masses. We compare the strength of this process with the known leadi...
1994-04-19
2009-10-28
[ "hep-ph" ]
C.Zecher, T.Matsuura, J.J.van der Bij
hep-ph/9404289
The radiative decay of a high energy neutrino in the Coulomb field of a nucleus
In the framework of the Standard Model with lepton mixing the radiative decay $\nu_i \rightarrow \nu_j \gamma$ of a neutrino of high ($E_\nu \sim 100 \, GeV$) and super-high ($E_\nu \ge 1 \, TeV$) energy is investigated in the Coulomb field of a nucleus. Estimates of the decay probability and ``decay cross-section'' fo...
1994-04-19
2009-10-28
[ "hep-ph" ]
A.A.Gvozdev, N.V.Mikheev and L.A.Vassilevskaya
hep-ph/9404291
Exotic Searches
The experimental information on the search for non $q \bar q$ mesons as glueballs, hybrids and multiquark states is reviewed. Candidate states which are particularly amenable to detailed study by accumulating large samples of $J/\psi$, $\eta_c$, $\chi$ decays at a $\tau$-charm factory are discussed.
1994-04-19
2007-05-23
[ "hep-ph" ]
M. Doser and A. Palano
hep-ph/9404300
Recent Results in Neutrino Physics
Invited Talk at {\sl ICNAPP}, Bangalore, India, Jan. 1994; {\sl Int. School on Cosmological Dark Matter}, Valencia, Oct. 1993; and Gran Sasso meeting on {\sl Solar Neutrino Problem: astrophysics or oscillations?}, march 1994.
1994-04-19
2009-09-25
[ "hep-ph" ]
Jos\'e W. F. Valle
hep-ph/9404292
Next-to-Leading Order Debye-Screening in Spontaneously Broken Gauge Theories
The main role of the Debye screening mass in the perturbative treatment of the electro-weak phase transition is the reduction of the cubic term that determines the strength of a first-order transition. In this note I point out that the standard definition of the Debye mass is unphysical. Its next-to-leading order corre...
1994-04-19
2007-05-23
[ "hep-ph" ]
A. K. Rebhan
hep-ph/9404301
Off-shell pion electromagnetic form factor from a gauge-invariant Nambu-Jona-Lasinio model
The off--shell electromagnetic vertex function of pions and kaons is studied in a bosonized Nambu--Jona-Lasinio model with a gauge--invariant proper--time cutoff. The slope of the pion form factor with respect to the pion 4--momentum is found to be equal to the on--shell pion charge radius in the chiral limit. The off-...
1994-04-19
2009-10-28
[ "hep-ph", "nucl-th" ]
C. Weiss
hep-ph/9404299
New Supernova Constraints on active-sterile neutrino conversions
We consider active-sterile neutrino conversions in a supernova in the presence of random magnetic field domains. For large enough fields the magnetization of the medium may enhance the active to sterile neutrino conversion rates. Neglecting neutrino transition magnetic moments we show that for KeV neutrino mass squared...
1994-04-19
2009-09-25
[ "hep-ph" ]
V. Semikoz and J. W. F. Valle
hep-ph/9404294
Confinement and the Pion Nucleon Sigma Term
Gribov's theory of confinement offers a simple explanaton of the value of the pion nucleon sigma term. There is no need to invoke a large strange quark component in the nucleon.
1994-04-19
2008-11-26
[ "hep-ph" ]
S. D. Bass (Cavendish Laboratory)
hep-ph/9404298
A Three Configurations Diquark Model for Baryons
The wave functions in the diquark-quark model for baryons are modified to take into account the effect of the different masses of the quarks in diquark formation. A spatial wave function is introduced multiplying each flavour-spin configuration in the quark-diquark model. Futhermore a numerical coefficient is introduce...
1994-04-19
2007-05-23
[ "hep-ph" ]
W. S. Carvalho and A. C. B. Antunes
hep-ph/9404293
Quantum tunnelings with global charge
We investigate quantum tunneling in the theory of a complex scalar field with a global $U(1)$ symmetry when the charge density of the initial configuration does not vanish. We discuss the possible final configurations and set up the Euclidean path integral formalism to find the bubble nucleation and to study the bubble...
1994-04-19
2009-10-28
[ "hep-ph", "cond-mat" ]
Kimyeong Lee
hep-ph/9404280
Prospects of Measuring the Parity of Higgs Particles
We analyze the prospects of measuring the parity of Higgs particles in the Standard Model and its supersymmetric extensions. Higgs decays are discussed in this context as well as production processes including, in particular, the fusion of Higgs particles in linearly polarized photon--photon collisions.
1994-04-18
2009-10-28
[ "hep-ph" ]
M. Kraemer, J. Kuehn, M. L. Stong, and P. M. Zerwas
hep-ph/9404286
Finite-Element Time Evolution Operator for the Anharmonic Oscillator
The finite-element approach to lattice field theory is both highly accurate (relative errors $\sim1/N^2$, where $N$ is the number of lattice points) and exactly unitary (in the sense that canonical commutation relations are exactly preserved at the lattice sites). In this talk I construct matrix elements for dynamical ...
1994-04-18
2007-05-23
[ "hep-ph" ]
Kimball A. Milton (Department of Physics and Astronomy, The University of Oklahoma, Norman OK, USA)
hep-ph/9404284
The $O(g^4)$ Lipatov Kernels
Leading plus next-to leading log results for the Regge limit of massless Yang-Mills theories are reproduced by reggeon diagrams in which the Regge slope $\alpha' \to 0$ and reggeon amplitudes satisfy Ward identity constraints at zero transverse momentum. Using reggeon unitarity together with multiple discontinuity theo...
1994-04-18
2014-11-17
[ "hep-ph", "hep-th" ]
Alan R. White
hep-ph/9404283
Decays of $B$ Mesons to Two Light Pseudoscalars
The decays $B \to PP$, where $P$ denotes a pseudoscalar meson, are analyzed, with emphasis on charmless final states. Numerous triangle relations for amplitudes hold within SU(3) symmetry, relating (for example) the decays $B^+ \to \pi^+ \pi^0,~ \pi^0 K^+$, and $\pi^+ K^0$. Such relations can improve the possibilities ...
1994-04-18
2010-11-01
[ "hep-ph" ]
Michael Gronau, Oscar F. Hernandez, David London, Jonathan L. Rosner
hep-ph/9404282
Weak Coupling Phase from Decays of Charged B Mesons to $\pi K$ and $\pi\pi$
The theory of $CP$ violation based on phases in weak couplings in the Cabibbo-Kobayashi-Maskawa (CKM) matrix requires the phase $\gamma \equiv {\rm Arg~} V^*_{ub}$ (in a standard convention) to be nonzero. A measurement of $\gamma$ is proposed based on charged $B$ meson decay rates to $\pi^+ K^0$, $\pi^0 K^+$, $\pi^+ \...
1994-04-18
2009-09-25
[ "hep-ph" ]
Michael Gronau, Jonathan L. Rosner and David London
hep-ph/9404277
Target Independence of the Emc-SMC Effect
An approach to deep inelastic scattering is described in which the matrix elements arising from the operator product expansion are factorised into composite operator propagators and proper vertex functions. In the case of polarised $\m p$ scattering, the composite operator propagator is identified with the square root ...
1994-04-18
2009-10-28
[ "hep-ph" ]
S. Narison, G.M. Shore and G. Veneziano
hep-ph/9404285
$\Lambda (1405)$ Contribution to Kaon-Nucleon Scattering Lengths In Chiral Perturbation Theory
We examine the role of the $\Lambda(1405)$ in kaon-nucleon scattering lengths using chiral perturbation theory. The leading nonanalytic SU(3) corrections reduce the coupling of the $\Lambda (1405)$ to $KN$ compared to $\Sigma\pi$. S-wave $K^-p$ scattering is the only channel significantly affected by the $ \Lambda (140...
1994-04-18
2011-07-19
[ "hep-ph", "nucl-th" ]
Martin J. Savage
hep-ph/9404279
$\pi$-$A_1$ electromagnetic form factors and light-cone QCD sum rules
Electromagnetic form factors of the transition $\pi+\gamma_{virt.}\ra A_1$ are calculated by QCD sum rules technique with the description of the pion in terms of the set of wave functions of increasing twist. Obtained results are compared with standard QCD sum rule calculations.
1994-04-18
2014-11-17
[ "hep-ph" ]
V.M.Belyaev
hep-ph/9404281
Measuring Strong and Weak Phases in Time-Independent B Decays
Flavor SU(3) symmetry implies certain relations among $B$-decay amplitudes to $\pi\pi$, $\pi K$ and $K {\bar K}$ final states, when annihilation-like diagrams are neglected. Using three triangle relations, we show how to measure the weak CKM phases $\alpha$ and $\gamma$ using time-independent rate measurements only. In...
1994-04-18
2009-09-25
[ "hep-ph" ]
Oscar F. Hernandez, David London, Michael Gronau, Jonathan L. Rosner
hep-ph/9404278
Strings versus supersymmetric GUTs: can they be reconciled?
We describe a class of supersymmetric unified models with the following properties: i) the full breaking of the gauge group is achieved by Higgs fields in the fundamental representation; ii) the correct unification of the strong and electroweak coupling constants is obtained without the need of any intermediate sca...
1994-04-18
2016-09-01
[ "hep-ph" ]
R. Barbieri, G. Dvali and A. Strumia
hep-ph/9404276
Fundamental CP-violating quantities in a SU(2)$ \otimes $U(1) model with many Higgs doublets
We consider a SU(2)$ \otimes $U(1) gauge theory with many scalar doublets, but without fermions. We devise a systematic method of constructing quantities which are invariant under changes of basis of the scalar fields, but acquire a minus sign under a general CP transformation. Those quantities provide a basis-independ...
1994-04-17
2010-11-01
[ "hep-ph" ]
L. Lavoura and Joao P. Silva
hep-ph/9404274
Skyrmion Quantization and the Decay of the Delta
We present the complete solution to the so-called ``Yukawa problem'' of the Skyrme model. This refers to the perceived difficulty of reproducing---purely from soliton physics---the usual pseudovector pion-nucleon coupling, echoed by pion coupling to the higher spin/isospin baryons $(I=J=3/2 , 5/2 , \cdots , N_c/2 )$ in...
1994-04-16
2009-10-28
[ "hep-ph", "nucl-th" ]
Nicholas Dorey, James Hughes and Michael Mattis
hep-ph/9404275
Exact Sum Rules at Finite Temperature and Chemical Potential and Their Application to QCD
Within the framework of the operator product expansion (OPE) and the renormalization group equation (RGE), we show that the temperature and chemical potential dependence of the zeroth moment of a spectral function (SF) is completely determined by the one-loop structure of an asymptotically free theory. This exact resul...
1994-04-16
2011-01-04
[ "hep-ph", "hep-lat", "nucl-th" ]
Suzhou HUANG and Marcello LISSIA
hep-ph/9404273
Scattering from Electroweak Strings
The scattering of a charged fermion from an electroweak string is studied. Owing to an amplification of the wave function at the core radius, the cross sections for helicity flip processes can be largely enhanced. For $0 <\sin^2 \theta_w < 1/2 $ (where $\theta_w$ is the Weinberg angle), $\omega \sim k \sim m_e$ and $kR...
1994-04-15
2009-10-28
[ "hep-ph", "hep-th" ]
Hoi-Kwong LO
hep-ph/9404272
Baryon Asymmetry from a Two Stage Electroweak Phase Transition ?
We investigate an extension of the standard model with a second Higgs doublet, showing a two stage phase transition. Wash-out of a baryon asymmetry after the phase transition can be easily avoided in this class of models. B+L transitions are more strongly suppressed in the intermediate phase than in the high temperatur...
1994-04-15
2009-10-28
[ "hep-ph" ]
A.Hammerschmitt, J. Kripfganz, M.G. Schmidt