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hep-ph/9405411
Flavour Mixing and Fermion Mass Generation as a Result of Symmetry Breaking
It is shown that a simple breaking of the subnuclear democracy leads to a successful description of the mixing between the second and third family. In the lepton channel the $\nu _{\mu } - \nu_{\tau }$ oscillations are expected to be described by a mixing angle of $2.65^ {\circ }$ which might be observed soon in neutri...
1994-05-30
2007-05-23
[ "hep-ph" ]
Harald Fritzsch
hep-ph/9405407
Fragmentation production of J/psi and psi' at the Tevatron
We present a calculation of the charm and gluon fragmentation contributions to inclusive $J/\psi$ and $\psi'$ production at large transverse momentum at the Tevatron. For $\psi$ production, we include both fragmentation directly into $\psi$ and fragmentation into $\chi_c$ followed by the radiative decay $\chi_c \to \ps...
1994-05-28
2011-07-19
[ "hep-ph" ]
Michael A. Doncheski (Department of Physics, Carleton University, Ottawa, Ontario, Canada), Sean Fleming (Department of Physics and Astronomy, Northwestern University, Evanston, IL) and Michelangelo L. Mangano (INFN, Scuola Normale Superiore and Dipartimento di Fisica, Pisa, Italy)
hep-ph/9405405
Neutrino Decay in the Doublet Majoron Model
A new Majoron model is presented within the framework of the seesaw mechanism. Its Higgs sector consists of only doublet representations and the lepton-number violation takes place at the same scale of the electroweak symmetry breaking. This model is different from the singlet- or triplet-Majoron model in several respe...
1994-05-27
2009-10-28
[ "hep-ph", "astro-ph" ]
Hisashi Kikuchi and Ernest Ma
hep-ph/9405398
Initial-state QED corrections to four-fermion production in e+e- collisions at LEP200 and beyond
The implementation of QED initial-state radiative corrections in the process of four-fermion production at LEP200 and higher-energy e+e- colliders is discussed. Because of the presence of charged-current processes, this is a nontrivial problem, and we compare our approach with other existing treatments. We describe the...
1994-05-27
2009-10-28
[ "hep-ph" ]
F.A.Berends, R. Pittau and R. Kleiss
hep-ph/9405406
On Testing Local QFT at LHC
We discuss the importance of measuring $\rho= ReF/ImF$ at LHC to test the forward dispersion relations and local QFT. It is pointed out that at LHC we can reach a short distance domain that has not been pre-explored by QED. This is in contrast with all previous tests of the dispersion relations. We argue that the most ...
1994-05-27
2009-09-25
[ "hep-ph", "hep-th" ]
Nicola N. Khuri
hep-ph/9405401
Three-jet final states and measuring the $\gamma\gamma$ width of the Higgs at a photon linear collider
The identification of the intermediate-mass Higgs process $\gamma\gamma\to H \to b \bar b$ will be one of the most important goals of a future photon linear collider. Potentially important backgrounds from the continuum $\gamma\gamma \to c \bar c, b \bar b$ leading-order processes can be suppressed by a factor $m_q^2/s...
1994-05-27
2011-01-25
[ "hep-ph" ]
D. L. Borden, V. A. Khoze, W. J. Stirling, and J. Ohnemus
hep-ph/9405399
Neutrino Masses and $b-\tau$ unification in the Supersymmetric Standard Model
There are several indications that the Majorana masses of the right-handed neutrino components, $M_R,$ are at the intermediate scale: $M_R\sim (10^{10}-10^{12})$ GeV or even lighter. The renormalization effects due to large Yukawa couplings of neutrinos from region of momenta $M_R \ltap q \ltap M_G$ are studied in the ...
1994-05-27
2009-10-28
[ "hep-ph" ]
F. Vissani and A. Yu. Smirnov
hep-ph/9405403
Dispersive Methods and QCD Sum Rules for \gamma \gamma Collisions
It has been shown, in the case of meson photoproduction, that the power-law falloff of these reactions can be described by lowest order (real) sum rules, at moderate momentum transfer. The phases of these processes, in this regime, are usually thought to be non-perturbative. In a sum rule framework, however, they can p...
1994-05-27
2009-10-28
[ "hep-ph" ]
Claudio Coriano'
hep-ph/9405395
Radiative Majorana Neutrino Masses
We present new radiative mechanisms for generating Majorana neutrino masses, within an extension of the standard model that successfully generates radiative charged lepton masses, order by order, from heavy sequential leptons. Only the new sequential neutral lepton has a right-handed partner, and its Majorana mass prov...
1994-05-27
2009-10-28
[ "hep-ph" ]
Wei-Shu Hou and Gwo-Guang Wong
hep-ph/9405397
Unitarity Constraints for the Mass of the Higgs in the $SU(2)_L\otimes U(1)\otimes U(1)'$ Gauge Model
The critical values for the mass of the Higgs bosons, at which the theory becomes strongly interacting, are calculated using the equivalence theorem, at high energies this allows us to replace the longitudinally polarized gauge bosons in the $S$ matrix for the corresponding Goldstone bosons. An appropriate ansatz for d...
1994-05-27
2016-08-14
[ "hep-ph" ]
R. Mart\'inez and N. Vanegas
hep-ph/9405396
Problems of Perturbation Series in Non-Equilibrium Quantum Field Theories
In the standard framework of non-equilibrium quantum field theories, the pinch singularities associated to multiple products of $\delta$-functions do not cancel in a perturbative expansion unless the particle distributions are those for a system in thermal and chemical equilibrium.
1994-05-27
2016-09-01
[ "hep-ph" ]
T. Altherr and D. Seibert
hep-ph/9405394
Two--loop heavy Higgs corrections to the Higgs fermionic width
We calculate the two--loop electroweak corrections to the fermionic decay width of the Higgs boson at leading order in $m_{H}$. The sum of one--loop and two--loop radiative corrections turns out to be at 6% level over the whole range of $m_{H}$ where the perturbation theory is supposed to be a sensible approximation. W...
1994-05-27
2009-10-28
[ "hep-ph" ]
Adrian Ghinculov
hep-ph/9405393
Constructing QCD Loop Amplitudes Using Collinear Limits
We discuss how higher-point QCD amplitudes may be constructed from lower point ones by imposing the factorization constraints in the limits as external momenta become collinear. As a particular example, the all-$n$ gluon one-loop amplitude with maximal helicity violation is presented. We also discuss the necessary coll...
1994-05-27
2009-09-25
[ "hep-ph" ]
G. Chalmers
hep-ph/9405400
Transverse Energy Flow at HERA
We calculate the transverse energy flow accompanying small $x$ deep-inelastic events and compare with recent data obtained at HERA. In the central region between the current jet and the remnants of the proton we find that BFKL leading $\ln(1/x)$ dynamics gives a distinctively large transverse energy distribution, in ap...
1994-05-27
2010-03-25
[ "hep-ph" ]
K.Golec-Biernat, J.Kwiecinski, A.D.Martin and P.J.Sutton
hep-ph/9405404
CKM Matrix Elements: Magnitudes, Phases, Uncertainties
Schemes for fermion masses should predict elements of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. We review the freedom allowed by present experiments and how the parameter space will shrink in the next few years. In addition to experiments which directly affect CKM parameters, we discuss constraints arising from preci...
1994-05-27
2008-02-03
[ "hep-ph" ]
Jonathan L. Rosner
hep-ph/9405390
A Simple Way to Estimate the Value of $\bar{\alpha}\equiv\alpha(m^2_Z)$
To obtain the value of electromagnetic coupling constant at $q^2=m^2_Z$, $\bar{\alpha}$, which plays a key role in electroweak physics one has to integrate the cross-section of $e^+e^-$-annihilation into hadrons divided by $(s-m^2_Z)$ over $s$ from threshold to infinity. By combining, for each flavor channel, the contr...
1994-05-26
2007-05-23
[ "hep-ph" ]
R.B. Nevzorov, A.V. Novikov, M.I. Vysotsky
hep-ph/9405385
Dark Matter and Structure Formation with Late Decaying Particles
Since it became evident that the CDM model for cosmic structure formation predicts smaller power on large scales than observed, many alternatives have been suggested. Among them, the existence of late decaying particle can cure it by delaying the beginning of the matter domination and increasing the horizon length at t...
1994-05-26
2010-12-09
[ "hep-ph", "astro-ph" ]
Hang Bae Kim and Jihn E. Kim
hep-ph/9405389
Inflation, Supergravity and Superstrings
The positive potential energy required for inflation spontaneously breaks supersymmetry and in general gives any would-be inflaton an effective mass of order the inflationary Hubble parameter thus ruling it out as an inflaton. In this paper I give simple conditions on the superpotential that eliminate some potential so...
1994-05-26
2009-10-28
[ "hep-ph", "astro-ph", "hep-th" ]
Ewan D. Stewart
hep-ph/9405391
Probing Anomalous Chromomagnetic Top Quark Couplings at the NLC
The Next Linear Collider(NLC) will provide a excellent tool for probing the detailed nature of the top quark. By extending the recent analysis of Dokshitzer, Khoze and Sterling, we perform a preliminary examination of the influence of an anomalous chromomagnetic moment for the top, $\kappa$, on the spectrum of gluon ra...
1994-05-26
2009-10-28
[ "hep-ph" ]
Thomas G. Rizzo
hep-ph/9405388
High-Energy Factorization and Small-X Deep Inelastic Scattering Beyond Leading Order
High-energy factorization in QCD is investigated beyond leading order and its relationship to the factorization theorem of mass singularities is established to any collinear accuracy. Flavour non-singlet observables are shown to be regular at small x order by order in perturbation theory. In the singlet sector, we deri...
1994-05-26
2009-10-28
[ "hep-ph" ]
S. Catani and F. Hautmann
hep-ph/9405383
Parton Equilibration in Ultrarelativistic Heavy Ion Collisions
Medium effects which include color screening and Landau-Pomeranchuk-Migdal suppression of induced radiation are discussed in connection with the equilibration of dense partonic system in ultrarelativistic heavy ion collisions. Taking into account of these medium effects, the equilibration rate for a gluonic gas are der...
1994-05-26
2007-05-23
[ "hep-ph", "nucl-th" ]
Xin-Nian Wang
hep-ph/9405387
Multisphalerons in the Weinberg-Salam Theory
We construct multisphaleron solutions in the Weinberg-Salam theory. The multisphaleron solutions carry Chern-Simons charge $n/2$, where $n$ is an integer, counting the winding of the fields in the azimuthal angle. The well-known sphaleron has $n=1$. The multisphalerons possess axial symmetry and parity reflection symme...
1994-05-26
2009-10-28
[ "hep-ph" ]
Burkhard Kleihaus and Jutta Kunz
hep-ph/9405392
Predicting the Masses of Heavy Hadrons without an Explicit Hamiltonian
There are striking regularities in the masses and mass differences of known hadrons. Some of these regularities can be understood from known general properties of the interactions of quarks without a need to specify the explicit form of the Hamiltonian. The Feynman--Hellmann theorem is one of the tools providing this u...
1994-05-26
2009-10-28
[ "hep-ph" ]
R. Roncaglia, A. Dzierba, D. B. Lichtenberg, and E. Predazzi
hep-ph/9405384
Heavy Quark Production at $e^+ e^-$ Colliders in Multijet Events and a New Method of Computing Helicity Amplitudes
Heavy quark production in multijet events at $e^+e^-$ colliders is studied at tree level. Total production rates are given and compared with the corresponding results for massless quarks. A new method of computing helicity amplitudes is briefly sketched. Talk presented at the XXIXth Rencontres de Moriond, QCD and High ...
1994-05-26
2009-09-25
[ "hep-ph" ]
Alessandro Ballestrero, Ezio Maina and Stefano Moretti (U. of Torino, Italy)
hep-ph/9405386
One-loop radiative corrections to the helicity amplitudes of QCD processes involving four quarks and one gluon
We present analytic results for the one-loop corrections of the helicity amplitudes of the QCD five-parton subprocesses involving four quarks and one gluon obtained with a standard Feynman diagram calculation using dimensional reduction.
1994-05-26
2009-10-28
[ "hep-ph" ]
Zoltan Kunszt, Adrian Signer and Zoltan Trocsanyi
hep-ph/9405377
QCD CORRECTIONS TO THE H+ -->t anti-b decay within the minimal supersymmetric standard model
I present the results of the QCD corrections to the H+ --> t anti-b decay within the minimal supersymmetric standard model, if gluinos and scalar quarks are taken within the relevant loop diagram. I include the mixing of the scalar partners of the left- and right-handed top quark, which is proportional to the top quark...
1994-05-25
2009-10-28
[ "hep-ph" ]
Heinz Konig
hep-ph/9405380
EEWW: a generator for $e^+e^- \to W^+W^-$ including one-loop and leading photonic two-loop corrections
We describe a generator for the process $e^+e^- \to W^+W^-$ including all one-loop and leading log photonic two-loop contributions. It includes polarization of the beam and $W$ bosons, and the possibility to study the effect of anomalous couplings.
1994-05-25
2009-10-28
[ "hep-ph" ]
Jochem Fleischer, Fred Jegerlehner, Karol Kolodziej, Geert Jan van Oldenborgh
hep-ph/9405376
Spin Formalism and Applications to New Physics Searches
An introduction to spin techniques in particle physics is given. Among the topics covered are: helicity formalism and its applications to the decay and scattering of spin-1/2 and spin-1 particles, techniques for evaluating helicity amplitudes (including projection operator methods and the spinor helicity method), and d...
1994-05-25
2009-09-25
[ "hep-ph" ]
Howard E. Haber
hep-ph/9405375
Defining the Nambu--Jona-Lasinio Model by Higher Derivative Kinetic Term
Usual treatment of the Nambu--Jona-Lasinio (NJL) model using loop momentum cutoff suffers from ambiguities in choosing the loop momenta to be cut off and violation of (external) gauge invariance. We define the NJL model from the starting Lagrangian level by using a higher derivative fermion kinetic term with a cutoff p...
1994-05-25
2009-10-28
[ "hep-ph" ]
Takashi HAMAZAKI and Taichiro KUGO
hep-ph/9405378
Baryon and lepton number transport in electroweak phase transition
We consider the baryon number generation by charge transport mechanism in the electroweak phase transition taking properly into account thermal fluxes through the wall separating true and false vacuum in the spatial space. We show that the diffusion from the true vacuum to the false one has a large diminishing effect o...
1994-05-25
2009-10-28
[ "hep-ph" ]
J. Maalampi, J. Sirkka and I. Vilja
hep-ph/9405382
Updated Limits on Visibly and Invisibly Decaying Higgs Bosons from LEP
Talk presented at the XXIX Rencontres de Moriond, Electroweak Interactions and Unified Theories, March 12-19, 1994, Meribel
1994-05-25
2019-08-17
[ "hep-ph" ]
F. de Campos, J. W. F. Valle, A. Lopez-Fernandez and J.C.Rom\~ao
hep-ph/9405379
Energy Losses (Gains) of Massive Coloured Particles in Stochastic Colour Medium
The propagation of massive coloured particles in stochastic background chromoelectric field is studied using the semiclassical equations of motion. Depending on the nature of the stochastic background we obtain the formulae for the energy losses of heavy coloured projectile in nonperturbative hadronic medium and for th...
1994-05-25
2010-11-01
[ "hep-ph" ]
Andrei Leonidov
hep-ph/9405381
Addendum To Our Paper: "Radiative Tau Decays With One Pseudoscalar Meson"
In a previous paper we have calculated the decay $\tau\to\pi\nu_\tau\gamma$. We used a given relative sign between the internal bremsstrahlung and the structure dependent radiation, which has been used by several other authors before. However, we believe that there are good arguments why the opposite sign is the physic...
1994-05-25
2007-05-23
[ "hep-ph" ]
Roger Decker and Markus Finkemeier
hep-ph/9405402
Vacuum Structure and Chiral Symmetry Breaking
We relate here the vacuum structure of chiral symmetry breaking to a wide class of low energy hadronic properties to examine consistency with experimental results. Phase transition of chiral symmetry breaking is described through explicit vacuum realignment. We find that for the present ansatz, vacuum structure of the ...
1994-05-25
2007-05-23
[ "hep-ph" ]
S.P. Misra
hep-ph/9405370
Relativistic mass distribution in event-anti-event system and ``realistic'' equation of state for hot hadronic matter
We find the equation of state $p,\rho \propto T^6,$ which gives the value of the sound velocity $c^2=0.20,$ in agreement with the ``realistic'' equation of state for hot hadronic matter suggested by Shuryak, in the framework of a covariant relativistic statistical mechanics of an event--anti-event system with small che...
1994-05-24
2009-10-28
[ "hep-ph", "hep-th" ]
L. Burakovsky and L.P. Horwitz
hep-ph/9405373
Source Dimensions in Ultrarelativistic Heavy Ion Collisions
Recent experiments on pion correlations, interpreted as interferometric measurements of the collision zone, are compared with models that distinguish a prehadronic phase and a hadronic phase. The models include prehadronic longitudinal expansion, conversion to hadrons in local kinetic equilibrium, and rescattering of t...
1994-05-24
2008-11-26
[ "hep-ph", "nucl-th" ]
M. Herrmann and G.F. Bertsch
hep-ph/9405366
Pion-Nucleon Scattering in a Large-N Sigma Model
We review the large-N_c approach to meson-baryon scattering, including recent interesting developments. We then study pion-nucleon scattering in a particular variant of the linear sigma-model, in which the couplings of the sigma and pi mesons to the nucleon are echoed by couplings to the entire tower of I=J baryons (in...
1994-05-24
2009-10-28
[ "hep-ph", "nucl-th" ]
Michael P. MATTIS and Richard R. SILBAR (Los Alamos Natl Lab)
hep-ph/9405374
Fermion Masses from Superstring Models with Adjoint Scalars
We explore the possibility of embedding supersymmetric GUT texture ideas into superstring models. We discuss the construction of GUT models using free fermionic strings. We find SO(10) models with adjoint scalars, three generations of chiral fermions, and a fundamental Higgs with a Yukawa coupling to only the third gen...
1994-05-24
2008-02-03
[ "hep-ph", "hep-th" ]
Shyamoli Chaudhuri, Stephen-wei Chung, and Joseph D. Lykken
hep-ph/9405368
Precise Determinations of the CKM Matrix from CP-Asymmetries in B-Decays and K_L --> \pi^0 \nu \bar\nu
We point out that the measurements of the CP asymmetries in neutral B-decays together with a measurement of $Br(K_L\to \pi^\circ\nu\bar\nu)$ and the known value of $\mid V_{us}\mid $ can determine {\it all} elements of the Cabibbo-Kobayashi-Maskawa matrix without essentially any hadronic uncertainties. In particular th...
1994-05-24
2010-11-01
[ "hep-ph" ]
A.J. Buras
hep-ph/9405371
Next-to-leading-order temperature corrections to correlators in QCD
Corrections of order $T^4$ to vector and axial current correlators in QCD at a finite temperature $T<T_c$ are obtained using dispersion relations for the amplitudes of deep inelastic scattering on pions. Their relation with the operator product expansion is presented. An interpretation of the results in terms of $T$-de...
1994-05-24
2009-10-28
[ "hep-ph" ]
V.L. Eletsky and B.L. Ioffe
hep-ph/9405372
An Automatic Invisible Axion In The SUSY Preon Model
It is shown that the recently proposed preon model which provides a unified origin of the diverse mass scale and an explanation of family replication as well as of inter-family mass-hierarchy, possesses a Peccei-Quinn symmetry whose spontaneous breaking leads to an automatic invisible axion. Existence of the PQ-symmetr...
1994-05-24
2011-05-12
[ "hep-ph" ]
K.S. Babu, Kiwoon Choi, J.C. Pati and X. Zhang
hep-ph/9405367
Renormalization scale uncertainty in tne DIS 2+1 jet cross-section
The deep inelastic scattering 2+1 jet cross- section is a useful observable for precision tests of QCD, e.g. measuring the strong coupling constant alpha(s). A consistent analysis requires a good understanding of the theoretical uncertainties and one of the most fundamental ones in QCD is due to the renormalization sch...
1994-05-24
2015-06-25
[ "hep-ph" ]
G. Ingelman and J. Rathmans
hep-ph/9405369
Enhancing the top signal at Tevatron using Neural Nets
We show that Neural Nets can be useful for top analysis at Tevatron. The main features of $t\bar t$ and background events on a mixed sample are projected in a single output, which controls the efficiency and purity of the $t\bar t$ signal.
1994-05-24
2009-12-30
[ "hep-ph" ]
Ll. Ametller, Ll. Garrido and P. Talavera
hep-ph/9405357
Realistic Superstring Models
I discuss the construction of realistic superstring standard--like models in the four dimensional free fermionic formulation. I discuss the massless spectrum of the superstring standard--like models and the texture of fermion mass matrices. These models suggest an explanation for the top quark mass hierarchy. At the cu...
1994-05-23
2007-05-23
[ "hep-ph", "hep-th" ]
Alon E. Faraggi
hep-ph/9405361
Relations among Zero Momentum Correlators for Heavy-Light Systems in QCD
Relations connecting various zero momentum correlators of interpolating fields for pseudoscalar and scalar channel, containing one heavy and one light quark field, are derived from the Euclidean space formulation of the QCD functional integral. These relations may serve as constraints on the phenomenological models or ...
1994-05-23
2010-11-01
[ "hep-ph" ]
Xuemin Jin and Thomas D. Cohen
hep-ph/9405354
Inclusion of Z->b b-bar vertex corrections in Precision Electroweak Tests on the Sp(6)_L X U(1)_Y Model
We extend our previous work on the precision electroweak tests in the Sp(6)_L X U(1)_Y family model to include for the first time the important Z->b b-bar vertex corrections encoded in a new variable epsilon_b, utilizing all the latest LEP data. We include in our analysis the one loop EW radiative corrections due to th...
1994-05-23
2015-06-25
[ "hep-ph" ]
Gye T. Park and T. K. Kuo
hep-ph/9405359
Electroweak Physics Issues at a High Energy Photon Collider
The main attractions of studying the bosonic sector of the electroweak standard model and its extensions at a future high energy photon collider are reviewed. A presentation of the laser scheme for obtaining such a collider is given where we emphasize the importance of polarised \gag spectra. The need for {\em measurin...
1994-05-23
2008-02-03
[ "hep-ph" ]
M.Baillargeon, G. Belanger and F. Boudjema
hep-ph/9405353
Weak Decays of Heavy-Quark Systems
The recent theoretical progress in the description of semileptonic decays in the framework of the heavy mass expansion is summarized. Both inclusive and exclusive decays are considered.
1994-05-23
2007-05-23
[ "hep-ph" ]
Thomas Mannel
hep-ph/9405360
On the 1/m^2 corrections to the form-factors in /\_b -> /\_c semileptonic decays
Model-independent bounds are presented for the form-factors describing the semileptonic decay $\Lambda_b\to\Lambda_ce\bar\nu_e$ at the end-point of the lepton energy spectrum. For the axial-vector form-factor $f_1^A(1)$ we obtain $f_1^A(1)\leq 0.960\div 0.935$, where the uncertainty arises from the value of $\mu_\pi^2$...
1994-05-23
2009-10-28
[ "hep-ph" ]
J.G.Korner and D.Pirjol
hep-ph/9405356
Fermion Mass Postdictions in a Generalized Extended Technicolour Scenario
We review the recent discussion in the literature of one family extended technicolour models with techni-fermion mass spectra compatible with the experimental data for the precision parameters S,T,U,V, W and X and ETC interactions compatible with the LEP measurements of the $Z\to b{\bar b}$ vertex. To investigate wheth...
1994-05-23
2010-11-01
[ "hep-ph" ]
Nick Evans
hep-ph/9405352
Non-Equilibrium Quantum Fields in the Large N Expansion
An effective action technique for the time evolution of a closed system consisting of one or more mean fields interacting with their quantum fluctuations is presented. By marrying large $N$ expansion methods to the Schwinger-Keldysh closed time path (CTP) formulation of the quantum effective action, causality of the re...
1994-05-23
2008-11-26
[ "hep-ph", "gr-qc", "hep-th" ]
Fred Cooper, Salman Habib, Yuval Kluger, Emil Mottola, Juan Pablo Paz, and Paul R. Anderson
hep-ph/9405358
Hints of Grand Unification in Neutrino Data
There are strong indications for neutrino masses and mixings in the data on solar neutrinos, the observed deficit of the muon neutrinos from the atmosphere as well as the discussions of the dark matter of the universe after COBE data. It is argued that the SO(10) grand unified has the right symmetry breaking properties...
1994-05-23
2007-05-23
[ "hep-ph" ]
R. N. Mohapatra
hep-ph/9405362
What is the Equivalence Theorem Really?
The precise statement of the equivalence theorem, between the longitudinally polarized states of a massive gauge boson and the corresponding goldstone mode, is discussed when the amplitude in question depends on masses of other particles (e.g., the Higgs boson) in the theory.
1994-05-23
2007-05-23
[ "hep-ph", "hep-th" ]
Palash B Pal (Center for Particle Physics, University of Texas, Austin, TX, USA)
hep-ph/9405364
Upper Bounds in Low-Energy SUSY
In the constrained MSSM one is typically able to restrict the supersymmetric mass spectra below roughly 1-2\tev\ {\em without} resorting to the ambiguous fine-tuning constraint.
1994-05-23
2007-05-23
[ "hep-ph", "astro-ph" ]
G.L. Kane, Chris Kolda, Leszek Roszkowski, and James D. Wells
hep-ph/9405363
Dark Matter from Supersymmetric Grand Unification
In constrained minimal supersymmetry the lightest neutralino of bino-type is the only neutral candidate for dark matter. As a result, one is typically able to restrict all the supersymmetric mass spectra below roughly 1-2\tev\ {\em without} imposing an ill-defined fine-tuning constraint.
1994-05-23
2008-02-03
[ "hep-ph", "astro-ph" ]
G.L. Kane, Chris Kolda, Leszek Roszkowski, and James D. Wells
hep-ph/9405355
Scanning the BFKL pomeron in elastic production of vector mesons at HERA
Elastic production of vector mesons $\gamma^{*} N\to V N$ is the pomeron-exchange dominated diffractive reaction with much potential of probing the BFKL pomeron. The BFKL pomeron can conveniently be described in terms of the dipole cross section which is a solution of the generalized BFKL equation. In this paper we dis...
1994-05-23
2009-10-28
[ "hep-ph" ]
J.Nemchik, N.N. Nikolaev and B.G. Zakharov
hep-ph/9405365
Quark Diffusion and Baryogenesis at the Electroweak Phase Transition
Baryogenesis at the electroweak phase transition may take place through CP-violating reflections of quarks from expanding bubbles of the broken symmetry phase. We formulate and approximately solve the transport equations for the reflected quark asymmetries. The results are comparable to a previous Monte Carlo calculati...
1994-05-23
2009-10-28
[ "hep-ph", "astro-ph" ]
James M. Cline
hep-ph/9405351
Classical and Quantum Coherent State Description of Nucleon-Antinucleon Annihilation at Rest in the Skyrme Model with Omega Mesons
We model the $N\bar{N}$ system at rest as a baryon number zero lump in the Skyrme model including the $\omega$ field. We integrate the classical equations of motion from the highly non-perturbative annihilation region into the non-interacting radiation zone. Subsequent coherent state quantization of the radiation field...
1994-05-22
2009-09-25
[ "hep-ph", "nucl-th" ]
Bin Shao and R. D. Amado
hep-ph/9405348
Perturbative QCD Fragmentation Functions for Production of P-wave Mesons with Charm and Beauty
We calculate the leading order QCD fragmentation functions for the production of $P$-wave charmed beauty mesons. Long-distance effects are factored into two nonperturbative parameters: the derivative of the radial wavefunction at the origin and a second parameter related to the probability for a $(\bar b c)$ heavy quar...
1994-05-21
2010-11-01
[ "hep-ph" ]
Tzu Chiang Yuan
hep-ph/9405350
Non-Equilibrium Quantum Field Evolution in FRW Cosmologies
We derive the effective equations for the out of equilibrium time evolution of the order parameter and the fluctuations of a scalar field theory in spatially flat FRW cosmologies. After setting the problem in general we propose a non-perturbative, self-consistent Hartree approximation. The method consists of evolving a...
1994-05-21
2007-05-23
[ "hep-ph", "astro-ph", "hep-th" ]
H.J. de Vega
hep-ph/9405349
Anomalous Vector-Boson Couplings in Majorana Neutrino Models
We examine the contributions of Majorana neutrinos to CP-violating WWZ and ZZZ self-couplings, using a model in which sterile neutrinos couple to the W and Z by mixing with a fourth-generation heavy lepton. We find that the induced form factors can be as large as 0.5%. The model satisfies all phenomenological bounds in...
1994-05-21
2010-11-01
[ "hep-ph" ]
C.P. Burgess and A. Pilaftsis
hep-ph/9405336
Large Scale Inhomogeneities from the QCD Phase Transition
We examine the first-order cosmological QCD phase transition for a large class of parameter values, previously considered unlikely. We find that the hadron bubbles can nucleate at very large distance scales, they can grow as detonations as well as deflagrations, and that the phase transition may be completed without re...
1994-05-20
2009-10-28
[ "hep-ph", "astro-ph" ]
J. Ignatius, K. Kajantie, H. Kurki-Suonio, and M. Laine
hep-ph/9405343
The Three Loop Equation of State of QED at High Temperature
We present the three loop contribution (order $e^4$) to the pressure of massless quantum electrodynamics at nonzero temperature. The calculation is performed within the imaginary time formalism. Dimensional regularization is used to handle the usual, intermediate stage, ultraviolet and infrared singularities, and also ...
1994-05-20
2014-11-17
[ "hep-ph" ]
Claudio Coriano` (Argonne) and Rajesh Parwani (Saclay)
hep-ph/9405342
Predictions of SUSY Masses in the Minimal SUSY GUT
The MSSM distinguishes itself from other GUT's by a successful prediction of many unrelated phenomena with a minimum number of parameters. Among them: a) Unification of the couplings constants; b)Unification of the masses; c) Proton decay; d) Electroweak symmetry breaking. A combined fit of the free parameters in the M...
1994-05-20
2012-01-11
[ "hep-ph" ]
W. de Boer, R. Ehret and D.I. Kazakov
hep-ph/9405346
Inconclusive Inclusive Nonleptonic $B$ Decays
We reconsider the conflict between recent calculations of the semileptonic branching ratio of the $B$ meson and the experimentally measured rate. Such calculations depend crucially on the application of ``local duality'' in nonleptonic decays, and we discuss the relation of this assumption to the weaker assumptions req...
1994-05-20
2009-10-28
[ "hep-ph" ]
Adam F. Falk, Mark B. Wise and Isard Dunietz
hep-ph/9405341
Virtual Photons in Chiral Perturbation Theory
In the framework of chiral perturbation theory virtual photons are included. We calculate the divergences of the generating functional to one loop and determine the structure of the local action that incorporates the counterterms which cancel the divergences. As an application we discuss the corrections to Dashen's the...
1994-05-20
2009-10-28
[ "hep-ph" ]
R. Urech
hep-ph/9405339
The Anharmonic Correction in the Soliton Model for the Hyperons
We derive the anharmonic correction to the hyperon energy in the bound state version of the topological soliton model for the hyperons, and show that it represents a negative correction of at most 10% to the energy of the bound heavy flavour two-meson system in the case of cascade hyperons. The main anharmonic correcti...
1994-05-20
2009-10-28
[ "hep-ph" ]
M. Bjornberg, K. Dannbom and D.O. Riska
hep-ph/9405338
Structure functions and low x physics
In the framework of conventional Regge theory we present a common description of total photon-proton cross-section and proton structure functions in the region $0 \leq Q^2 \leq 5 \ {\rm GeV}^2$. Using it as an initial condition in the perturbative QCD evolution equation, we describe structure functions at any $Q^2$ and...
1994-05-20
2009-10-28
[ "hep-ph" ]
A. Capella, A. Kaidalov, C. Merino and J. Tran Thanh Van
hep-ph/9405344
Penguins leaving the pole: bound-state effects in B decaying to K* + photon
Applying perturbative QCD methods recently seen to give a good description of the two body hadronic decays of the B meson, we address the question of bound-state effects on the decay B into K* + gamma. Consistent with most analyses, we demonstrate that gluonic penguins, with photonic bremsstrahlung off a quark, change ...
1994-05-20
2009-10-28
[ "hep-ph" ]
C. E. Carlson and J. Milana
hep-ph/9405345
The R Axion From Dynamical Supersymmetry Breaking
All generic, calculable models of dynamical supersymmetry breaking have a spontaneously broken $R$ symmetry and therefore contain an $R$ axion. We show that the axion is massive in any model in which the cosmological constant is fine-tuned to zero through an explicit $R$-symmetry-breaking constant. In visible-sector mo...
1994-05-20
2019-08-17
[ "hep-ph", "astro-ph", "hep-th" ]
Jonathan Bagger, Erich Poppitz, and Lisa Randall
hep-ph/9405340
A Critical Analysis of the Proton Form Factor with Sudakov Suppression and Intrinsic Transverse Momentum
The behavior of the proton magnetic form factor is studied within the modified hard scattering picture, which takes into account gluonic radiative corrections in terms of transverse separations. We parallel the analysis given previously by Li and make apparent a number of serious objections. The appropriate cut-off nee...
1994-05-20
2009-09-25
[ "hep-ph" ]
J. Bolz, R. Jakob, P. Kroll, M. Bergmann, N.G. Stefanis
hep-ph/9405337
Flat Potential for Inflaton with a Discrete $R$-invariance in Supergravity
We show that a very flat potential of inflaton required for a sufficient inflation is naturally obtained in $N=1$ supergravity by imposing a discrete $R$-invariance $Z_{n}$. Several cosmological constraints on parameters in the inflaton superpotential are derived. The reheating temperature turns out to be $(1-10^8)$GeV...
1994-05-20
2017-02-01
[ "hep-ph" ]
K. Kumekawa, T. Moroi and T. Yanagida
hep-ph/9405347
Another Source of Baryons in $B$ Meson Decays
It is usually assumed that the production of baryons in $B$ meson decays is induced primarily by the quark level process $b\to c\bar ud$, where the charm quark hadronizes into a charmed baryon. With this assumption, the $\Lambda_c$ momentum spectrum would indicate that the transition $B\to\Lambda_c X$ is dominated by m...
1994-05-20
2009-10-28
[ "hep-ph" ]
Isard Dunietz, Peter S. Cooper, Adam F. Falk and Mark B. Wise
hep-ph/9405330
Masses of the Light Quarks
The magnitude of $m_u,\,m_d$ and $m_s$ is discussed on the basis of Chiral Perturbation Theory. In particular, the claim that $m_u=0$ leads to a coherent picture for the low energy structure of QCD is examined in detail. It is pointed out that this picture leads to violent flavour asymmetries in the matrix elements of ...
1994-05-19
2009-09-25
[ "hep-ph" ]
H. Leutwyler
hep-ph/9405328
QCD Physics at LEP 2
I will discuss, in a concise way, the main objectives of QCD studies at LEP 2.
1994-05-19
2009-09-25
[ "hep-ph" ]
V.A. Khoze (Department of Physics, University of Durham, Durham DH1 3LE, England)
hep-ph/9405327
Light Scalar Top and Heavy Top Signature at CDF
We propose a mechanism which could explain a slight excess of top signal rate recently reported by CDF in the framework of the supersymmetric standard model. If the scalar partner of the top (stop) is sufficiently light, the gluino with an appropriate mass could decay into the stop plus the top with almost 100\% branch...
1994-05-19
2009-10-28
[ "hep-ph" ]
Tadashi Kon and Toshihiko Nonaka
hep-ph/9405333
Equation of State for Particles Arising at the Universe at Grand Unification Energies
First postinflationary stage of the Universe evolution is considered in more detail. It is shown that heavy particles with mass $M_{H}\sim M_{GUT}$ arising at the Universe at phase transitions at Grand Unification Energies behave like ideal quantum degenerate Bose gas. The equation of state for both scalar and gauge bo...
1994-05-19
2007-05-23
[ "hep-ph", "gr-qc" ]
I. Dymnikova and M. Krawczyk
hep-ph/9405334
Majorana Masses for Neutrinos in SO(10)
We study the predictions for Majorana masses for neutrinos in SO(10) grandunification models. (This paper precedes and is cited in the article "PROTON DECAY AND NEUTRINO MASSES IN SO(10)", hep-ph/9405332)
1994-05-19
2009-09-25
[ "hep-ph" ]
G. Amelino-Camelia, F. Buccella, and L. Rosa
hep-ph/9405335
Instanton interactions and non-perturbative particle production in QCD
I discuss the possible instanton-induced multiparticle production in hard processes in QCD Figures are available upon request
1994-05-19
2009-09-25
[ "hep-ph" ]
I.Balitsky
hep-ph/9405325
Quark Mass Effects in Fermionic Decays of the Higgs Boson in $O(\alpha_s^2)$ Perturbative QCD
The results of analytical evaluation of $O(\alpha_s^2)$ QCD contributions due to the nonvanishing quark masses to $\Gamma_{H\rightarrow q_f\overline{q}_f}$ are presented. The ``triangle anomaly'' type contributions are included. As a byproduct the $O(\alpha_s^3)$ logarithmic contributions are evaluated. The results are...
1994-05-19
2011-01-25
[ "hep-ph" ]
Levan R. Surguladze
hep-ph/9405329
Left-Right Symmetry and Supersymmetric Unification
The existence of an SU(3) X SU(2)_L X SU(2)_R X U(1) gauge symmetry with g_L = g_R at the TeV energy scale is shown to be consistent with supersymmetric SO(10) grand unification at around 1O^{16} GeV if certain new particles are assumed. The additional imposition of a discrete Z_2 symmetry leads to a generalized defini...
1994-05-19
2011-04-20
[ "hep-ph" ]
Ernest Ma
hep-ph/9405326
How to Use Weak Decays in Analyses of Data on Nucleon Spin Structure Functions
The use of weak decays to determine proton spin structure is examined in view of possible violations of the Bjorken and Gottfried Sum rules, flavor symmetry breaking and flavor asymmetry in the sea. The use of the neutron decay is found to be unaffected by all these. A method for including these effects in analyses of ...
1994-05-19
2009-10-28
[ "hep-ph" ]
Harry J. Lipkin
hep-ph/9405332
Proton Decay and Neutrino Masses in SO(10)
In the last few years physicists have been looking at $SO(10)$ GUT models with renewed attention because it has been realized that the SU(5) minimal model cannot unify the strong, electromagnetic and weak interactions in a way consistent with the experimental values of $\alpha(M_Z)$, $\si$ and $\alpha_S(M_Z)$. In this ...
1994-05-19
2009-09-25
[ "hep-ph" ]
F. Acampora, G. Amelino-Camelia, F. Buccella, O. Pisanti, L. Rosa, and T. Tuzi
hep-ph/9405331
QCD Sum Rules for $\Sigma$ Hyperons in Nuclear Matter
Within finite-density QCD sum-rule approach we investigate the self-energies of $\Sigma$ hyperons propagating in nuclear matter from a correlator of $\Sigma$ interpolating fields evaluated in the nuclear matter ground state. We find that the Lorentz vector self-energy of the $\Sigma$ is similar to the nucleon vector se...
1994-05-19
2009-09-25
[ "hep-ph" ]
Xuemin Jin and Marina Nielsen
hep-ph/9405316
On the Evolution of Magnetic Fields in the Early Universe
We address the question of the existence of magnetic domains in a recent scenario for the creation of primordial magnetic fields. We write down the magnetohydrodynamic equation in an expanding universe in the infinite conductivity limit and discuss its solution. No domains are found.
1994-05-18
2007-05-23
[ "hep-ph" ]
Kari Enqvist and Poul Olesen
hep-ph/9405319
The Electroweak Phase Transition in Extended Models
We study the possibility of relaxing the cosmological bound on the Higgs mass coming from the requirement of non-erasure of the baryon asymmetry by sphalerons. After reviewing the Standard Model case we obtain this bound in two extensions of it: 1) The Standard Model with an additional gauge singlet, and 2) The Minimal...
1994-05-18
2009-09-25
[ "hep-ph" ]
J.R.Espinosa
hep-ph/9405314
Flavour Dependence of Form Factors in Heavy Meson Decays
Recently we have shown that due account of Wigner spin rotations is needed to match the ISGW model consistently onto HQET. We now discuss the flavour dependence of this procedure. We find that for finite mass ``heavy'' quark the universal function $\xi(y=1) \approx 1$ but the slope is proportional to the energy of the ...
1994-05-18
2010-11-01
[ "hep-ph" ]
F. E. Close, A. Wambach
hep-ph/9405318
Failure of the commonly used B -> K(K^*) form factors in explaining recent data on B -> J/\Psi + K ( K^* ) decays
We establish restrictions on $B \ra K ( K^* )$ form factors imposed by recent data on $B \ra J/\Psi + K ( K^* ) $ decay rates and polarization. We show that these constraints are not satisfied by few commonly used models. Finally, we relate $B \ra K ( K^* )$ form factors to those in $D \ra K ( K^* )$ transitions using ...
1994-05-18
2009-09-25
[ "hep-ph" ]
M. Gourdin, A. N. Kamal and X. Y. Pham
hep-ph/9405323
Sea-quark Content of Nucleons from Proton-induced Drell-Yan Production
We analyse the proton-induced Drell-Yan production in both the flavor asymmetry and isospin breaking explanations for the violation of the Gottfried sum rule. Consequences from three different forms of corrections to the flavor and isospin symmetric parton distributions are examined. It is found that the calculated res...
1994-05-18
2009-10-28
[ "hep-ph" ]
Bo-Qiang Ma, Andreas Schaefer, and Walter Greiner
hep-ph/9405321
Running of the Top Yukawa with and without Light Gluinos
We investigate correlations among various parameters in the solution space of minimal supersymmetric grand unification. In particular the extent to which the top quark Yukawa coupling exhibits fixed point behavior is discussed and we compare various analytic approximations to its value at the top mass with its exact va...
1994-05-18
2009-09-25
[ "hep-ph" ]
L. Clavelli
hep-ph/9405315
On Primordial Magnetic Fields
A primordial magnetic field could be responsible for the observed magnetic fields of the galaxies. One possibility is that such a primordial field is generated at the electroweak phase transition because of the fluctuations in the Higgs field gradients. I describe a statistical averaging procedure which gives rise to a...
1994-05-18
2007-05-23
[ "hep-ph" ]
Kari Enqvist
hep-ph/9405320
Double Asymptotic Scaling at HERA
Perturbative QCD predicts that at sufficiently large $Q^2$ and small $x$ nucleon structure functions should exhibit scaling in the two variables $\sqrt{\ln\smallfrac{1}{x}\ln\ln Q^2}$ and $\sqrt{\ln\smallfrac{1}{x}\big/\ln\ln Q^2}$, provided only that the small-$x$ behaviour of the input to the perturbative QCD evoluti...
1994-05-18
2014-11-17
[ "hep-ph" ]
R. D. Ball and S. Forte
hep-ph/9405322
A Global Analysis of the Top Quark Couplings to Gauge Bosons
We propose to probe the electroweak symmetry breaking sector by measuring the effective couplings of the top quark to gauge bosons. Using precision LEP data, we constrain the non--universal couplings of t-t-Z and t-b-W, parameterized by $\kappa_{L}^{NC}$, $\kappa_{R}^{NC}$, $\kappa_{L}^{CC}$ and $\kappa_{R}^{CC}$, in t...
1994-05-18
2010-11-01
[ "hep-ph" ]
Ehab Malkawi and C.--P Yuan
hep-ph/9405313
Yukawa Unification: The Good, The Bad and The Ugly
We analyze some consequences of grand unification of the third-generation Yukawa couplings, in the context of the minimal supersymmetric standard model. We address two issues: the prediction of the top quark mass, and the generation of the top-bottom mass hierarchy through a hierarchy of Higgs vacuum expectation values...
1994-05-18
2009-09-25
[ "hep-ph" ]
Riccardo Rattazzi, Uri Sarid and Lawrence J. Hall
hep-ph/9405317
Higher-order corrections to Higgs-boson decays
We review the status of radiative corrections to the decay rates of the Standard-Model Higgs boson in the mass range accessible at LEP~2. Specifically, we consider corrections of ${\cal O}(\alpha)$, ${\cal O}(\alpha_sG_Fm_t^2)$, and ${\cal O}(G_F^2M_H^4)$ to the fermionic decay rates and two-loop QCD corrections to the...
1994-05-18
2009-10-28
[ "hep-ph" ]
Bernd A. Kniehl
hep-ph/9405324
QED With Unequal Charges: A study of spontaneous Zn symmetry breaking
We study two-dimensional QED with unequal charges at finite temperature, and show that there is a phase with a spontaneously broken $Z_n$ symmetry. In spite of this, we were not able to establish the presence of domain walls. The relevance for QCD in higher dimensions is discussed.
1994-05-18
2009-10-28
[ "hep-ph", "hep-lat", "hep-th" ]
T.H. Hansson, H.B. Nielsen and I. Zahed
hep-ph/9405308
Corrections of Order ${\cal O}(G_F\alpha_s m_t^2)$ to the Higgs Decay Rate $\Gamma(H\to b\bar{b})$
QCD corrections to the electroweak one-loop result for the partial width $\Gamma(H\rightarrow b\bar{b})$ are studied. For the decay channel into bottom quarks the rate is affected by a virtual top quark through electroweak interactions. The calculation of QCD corrections to this quantity is performed for an intermediat...
1994-05-17
2009-10-28
[ "hep-ph" ]
A. Kwiatkowski, M. Steinhauser
hep-ph/9405310
QCD Calculation of $B$ Meson Form Factors and Exclusive Nonleptonic Decays
The method of QCD sum rules has proven to be particularly useful in heavy quark physics, where a small distance scale is provided by the inverse heavy quark mass. We present two new examples for the application of this method to B-physics: a calculation of the heavy-to-light form factors $B \rightarrow \pi,K$ and an es...
1994-05-17
2009-09-25
[ "hep-ph" ]
A. Khodjamirian, R. R\"uckl
hep-ph/9405311
Extended Variational Approach to the SU(2) Mass Gap on the Lattice
The linear delta expansion is applied to a calculation of the SU(2) mass gap on the lattice. Our results compare favourably with the strong-coupling expansion and are in good agreement with recent Monte Carlo estimates.
1994-05-17
2009-10-28
[ "hep-ph", "hep-lat" ]
J. O. Akeyo, H. F. Jones and C. S. Parker
hep-ph/9405312
Supercooling of the quark-gluon plasma
Transition from the quark-gluon (QG) plasma to a hadronic gas is studied in the framework of the relativistic combustion theory. The calculations reveal that the QG phase must be in a strongly supercooled state. The stability of this solution with respect to minor modifications is investigated. In particular the effect...
1994-05-17
2009-09-25
[ "hep-ph" ]
Neven Bilic