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hep-ph/9407241
Chern-Simons number diffusion in (1+1)-dimensional Higgs theory
We study the Chern-Simons number diffusion rate in the (1+1)-dimensional latticeAbelian Higgs model at temperatures much higher than, as well as comparable to, the sphaleron energy. It is found that in the high-temperature limit the rate is likely to grow as power 2/3 of the temperature. In the intermediate-temperature...
1994-07-06
2010-11-01
[ "hep-ph", "hep-lat", "hep-th" ]
Ph. de Forcrand, A. Krasnitz, and R. Potting
hep-ph/9407234
A Short Note on Two-Loop Box Functions
It is shown that the two-loop four-point functions are similar in structure to the three-point two-loop functions for all mass cases and topologies. The result is derived by using a rotation to a (+,-,-,+) signature without spoiling analyticity properties.
1994-07-06
2009-10-28
[ "hep-ph" ]
Dirk Kreimer
hep-ph/9407238
Loop corrections to the sphaleron transition rate in the minimal standard model
The baryon number dissipation rate due to sphaleron transitions at high temperatures in the minimal standard model is evaluated. We find that this rate can be considerably suppressed by one loop contributions of bosonic and fermionic fluctuations which are particularly important for a small mass of the Higgs boson and ...
1994-07-06
2010-11-01
[ "hep-ph" ]
Dmitri Diakonov, Maxim Polyakov, Pavel Pobylitsa, Peter Sieber, Joerg Schaldach, Klaus Goeke
hep-ph/9407247
Universe Reheating after Inflation
We study the problem of scalar particle production after inflation by a rapidly oscillating inflaton field. We use the framework of the chaotic inflation scenario with quartic and quadratic inflaton potentials. Particular attention is paid to parametric resonance phenomena which take place in the presence of the quickl...
1994-07-06
2009-10-28
[ "hep-ph", "astro-ph", "gr-qc" ]
Y.Shtanov (Bogolyubov Institute and Brown University), J.Traschen (University of Massachusetts) and R.Brandenberger (Brown University)
hep-ph/9407236
New Tensor Interactions in $\mu$ Decay
The most general form of the hamiltonian for the muon decay is presented. We assume that it arises as a result of the exchange of intermediate bosons with a momentum $q$ and naturally should depend on this momentum. That allows us to introduce two additional coupling constants for the tensor interactions which give ris...
1994-07-06
2015-06-25
[ "hep-ph" ]
M.V.Chizhov
hep-ph/9407239
Fermion masses and mixings in a flavour symmetric GUT
We describe a supersymmetric Grand Unified Theory based on the gauge group $\SU(5)^3$, or $\SO(10)^3$, invariant under the interchange of any~SU(5), or~SO(10), with each family multiplet transforming non trivially under one different individual group factor. A realistic pattern of fermion masses and mixings is obtained...
1994-07-06
2009-10-09
[ "hep-ph" ]
Riccardo Barbieri, Gia Dvali and Alessandro Strumia
hep-ph/9407221
Analysis of one particle excitations in phenomenological models of QCD
In these notes for the quark Nambu-Jona-Lasinio model and for the phenomenological four fermionic model of QCD we analyze vacuum energy structure and calculate dependence of energy of one-particle excitations on momentum. We reveal existence of two different types of excitations above the vacuum with the respective min...
1994-07-05
2007-05-23
[ "hep-ph" ]
A.N.Vall, S.I.Korenblit, V.M.Leviant, A.V.Sinitskaya
hep-ph/9407228
A model calculation of the value of the electromagnetic coupling constant at $q^2 = m_{Z}^{2}$
A QCD model with an infinite number of vector mesons suggested by one of the authors is used to derive the value of the correction $\delta\alpha_{hadr}$ for $\alpha(m_{Z}^{2})$ due to the strong interactions. The result is $\delta\alpha_{hadr} = 0.0275(2)$ ; thus $\alpha(m^{2}_{Z}) = (128.96(3))^{-1}$.
1994-07-05
2009-10-28
[ "hep-ph" ]
B.V.Geshkenbein, V.L.Morgunov
hep-ph/9407229
Large Top and Bottom Yukawa Couplings in Minimal Supersymmetry
We present analytic expressions for the top and bottom Yukawa couplings in the context of the minimal supersymmetric standard model when both couplings $h_{t,0},h_{b,0}$ are large at the unification scale. For sufficiently large $h_{t,0},h_{b,0}$, i.e. within $\sim (20-25)\% $ close to their fixed point values, using a...
1994-07-05
2011-01-27
[ "hep-ph" ]
E.G. Floratos and G.K. Leontaris
hep-ph/9407225
Angular Correlations and Light Gluinos in Multi-jet Photoproduction at HERA
A study of $3+1$ jet event photoproduction at HERA is presented. We define an angular variable which is sensitive to the topology of the final state jets and is therefore able to discriminate between the different contributing subprocesses, and between QCD and an abelian gluon model. We also investigate the contributio...
1994-07-05
2011-07-19
[ "hep-ph" ]
R. Mu\~noz-Tapia and W.J. Stirling
hep-ph/9407230
The magnitude of the gluon condensate and the masses of $c$ and $b$ quarks from the families of ${\cal J}$/$\Psi$ and $\Upsilon$ mesons
It is shown that the model used in [1] for the description of the experimental function $R_c (s)$ in the form of a sum of $\delta$-functions and the plateau contradicts the Wilson operator expansion (O.E.) in the terms due to the gluon condensate. A QCD model with an infinite number of vector mesons [12,13] does satisf...
1994-07-05
2011-03-17
[ "hep-ph" ]
B.V.Geshkenbein, V.L.Morgunov
hep-ph/9407232
Initial State Radiation to Off-shell $\Z^0$ Pair Production in $e^+e^-$ Annihilation
A study of the Standard Model reaction $\e^+e^- \rightarrow (\Z^0\Z^0) \rightarrow f_1\bar{f_1}f_2\bar{f_2}$ including the effects of the finite $\Z^0$~width and initial state radiative corrections is presented. All angular phase space integrations are performed analytically. The remaining invariant masses are integrat...
1994-07-05
2015-06-25
[ "hep-ph" ]
D. Lehner
hep-ph/9407227
The Role of Screening Corrections in High Energy Photoproduction
The role of screening corrections, calculated using the eikonal model, is discussed in the context of soft photoproduction. We present a comprehensive calculation considering the total,elastic and diffractive cross sections jointly. We examine the differences between our results and those obtained from the supercritica...
1994-07-05
2009-10-28
[ "hep-ph" ]
E. Gotsman, E.M. Levin and U. Maor
hep-ph/9407226
Updating the Unitarity Triangle: Top Quark Mass Versus Nonperturbative Uncertainties
We summarize the present knowledge on the non-perturbative hadronic inputs needed in the analysis of $B^0$-$\bar B^0$ mixing and the CP-violating parameter $\varepsilon$ of the $K^0$-$\bar K^0$ system. Using this information, together with the recently determined value of the top-quark mass, we update the phenomenologi...
1994-07-05
2010-11-01
[ "hep-ph" ]
A. Pich and J. Prades
hep-ph/9407222
Solution of The Heisenberg Equation For The Four-fermion Contact Interaction by The Method of Dynamical Mappings
In the paper we consider non-relativistic analog of the Nambu-Jona-Lasinio model and demonstrate, by this most simplified example, the method of dynamical mappings of Heisenberg fields on "physical" fields. We obtain the expressions for one particle eigen-excitation spectrum of full Hamiltonian (spectrum of "clad" ferm...
1994-07-05
2007-05-23
[ "hep-ph" ]
A.N.Vall, V.M.Leviant and A.V.Sinitskaya
hep-ph/9407231
Physics at High Energy Photon Photon Colliders
I review the physics prospects for high energy photon photon colliders, emphasizing results presented at the LBL Gamma Gamma Collider Workshop. Advantages and difficulties are reported for studies of QCD, the electroweak gauge sector, supersymmetry, and electroweak symmetry breaking.
1994-07-05
2014-11-17
[ "hep-ph" ]
Michael S. Chanowitz
hep-ph/9407223
New probes of anomalous $WW\gamma$ couplings at future $e^+e^-$ linacs
We investigate the sensitivity of single photon plus missing energy cross-sections at future $e^{+}e^{-}$ linacs to non-standard $WW\gamma$ couplings. We show that even with conservative estimates of systematic errors there is still considerable sensitivity to anomalous couplings. Analytic expressions for helicity ampl...
1994-07-05
2009-10-28
[ "hep-ph" ]
K.J. Abraham, J. Kalinowski and P. Sciepko
hep-ph/9407224
Hadrons with Two Heavy Quarks
We review the spectroscopy and some properties of hadrons containing two charmed quarks, or more generally, two heavy quarks. This includes heavy baryons such as $(bcu)$, and possible exotic multiquark states.
1994-07-05
2007-05-23
[ "hep-ph" ]
Jean-Marc Richard (Grenoble)
hep-ph/9407233
Higher order corrections to bound state energy levels in QED: an effective field theory approach
In T.Zhang, L.Xiao and R.Koniuk, Can. J. Phys. {\bf 70}, 670 (1992), a new method was developed to calculate energy levels in QED nonrelativistic bound states, up to order m \alpha^5. Whether or not this method could be used beyond this order was left as an open question. In this paper, we answer this question with the...
1994-07-05
2016-09-01
[ "hep-ph" ]
Patrick Labelle
hep-ph/9407217
Probing Lumps of Wee Partons in Deep Inelastic Scattering
Recently, the ZEUS collaboration has reported on several remarkable properties of events with a large rapidity gap in deep inelastic scattering. We suggest that the mechanism underlying these events is the scattering of electrons off lumps of wee partons inside the proton. Based on an effective lagrangian approach the ...
1994-07-04
2009-10-28
[ "hep-ph" ]
Wilfried Buchmuller
hep-ph/9407216
Cross section for $ \gamma \gamma \rightarrow \pi^+ \pi^- \pi^0 $ in chiral perturbation theory
We give the amplitude for $\gamma\gamma \rightarrow \pi^+\pi^-\pi^0$ in leading order chiral perturbation theory. For the case of real photons we calculate the total and differential cross section. Furthermore, we give the dependence of the total cross section on the invariant mass of one of the photons.
1994-07-04
2009-10-28
[ "hep-ph" ]
J.W. Bos, Y.C. Lin, and H.H. Shih
hep-ph/9407214
Heavy Quark Symmetry and the Skyrme Model
We present a consistent way of describing heavy baryons containing a heavy quark as bound states of an $SU(2)$ soliton and heavy mesons. The resulting mass formula reveals the heavy quark symmetry explicitly. By extending the model to the orbitally excited states, we establish the generic structure of the heavy baryon ...
1994-07-04
2010-11-01
[ "hep-ph" ]
Yongseok Oh, Byung-Yoon Park and Dong-Pil Min
hep-ph/9407215
Beyond the MSSM
To increase the predictivity of the Minimal Supersymmetric Standard Model (MSSM), one needs to go to an underlying, more fundamental theory, where at least some of the many MSSM parameters can be determined by symmetries or by dynamics. Progress may come from four-dimensional superstring solutions and their effective s...
1994-07-04
2007-05-23
[ "hep-ph" ]
F. Zwirner
hep-ph/9407218
Absence of Matter-Induced Flavor-Changing Contribution to Neutrino Oscillation Hamiltonian
Paper withdrawn; ask me if you would like to know the details.
1994-07-04
2008-02-03
[ "hep-ph", "astro-ph" ]
J.M. Cline
hep-ph/9407219
Semianalytic Cascade Theory
We give a simple, semianalytic theory of the development of the hadronic and neutrino/muon components of a cascade induced by a primary which produces hadrons at the initial interaction. The main purpose of the theory is to allow the user to obtain quick, but reasonably reliable estimates of the longitudinal properties...
1994-07-04
2009-09-25
[ "hep-ph" ]
G. Domokos and S. Kovesi-Domokos (Dept. of Physics and Astronomy, Johns Hopkins University, Baltimore, MD)
hep-ph/9407220
The Quark Propagator from the Dyson-Schwinger Equations: I. the Chiral Solution
Within the framework of the Dyson-Schwinger equations in the axial gauge, we study the effect that non-perturbative glue has on the quark propagator. We show that Ward-Takahashi identities, combined with the requirement of matching perturbative QCD at high momentum transfer, guarantee the multiplicative renormalisabili...
1994-07-04
2009-10-28
[ "hep-ph", "hep-th" ]
J.R. Cudell, A.J. Gentles and D.A. Ross
hep-ph/9407210
Structure of proton and nuclei
We discuss in this set of lectures the structure of proton/neutron as revealed through a study of form-factors. This is followed by a discussion of the structure functions of proton/nuclear targets as measured in the deep inelastic scattering (DIS) of leptons off these targets. We discuss the parton model in DIS as wel...
1994-07-03
2007-05-23
[ "hep-ph" ]
Rohini M. Godbole
hep-ph/9407212
A Renormalization Group Approach to the Chiral Transition
A methodology is given to test the QCD $N_f$=2 chiral transition, presently conjectured to be second order. Scaling forms for the correlation length, susceptibilities and equation of state are given which account for finite lattice spacing. Confirmation by lattice simulation would provide a large set of consistency che...
1994-07-03
2015-06-25
[ "hep-ph" ]
Arjun Berera
hep-ph/9407211
Semiclassical Meson-Baryon Dynamics from Large-Nc QCD
The large-$N_c$ limit of the meson-baryon effective Lagrangian is shown to reduce to a semiclassical field theory. A chiral bag structure emerges naturally in the $N_c\rightarrow \infty$ limit. A possible connection between the chiral bag picture and the Skyrme model is discussed. The classical meson-baryon theory is u...
1994-07-03
2010-11-01
[ "hep-ph" ]
Aneesh V. Manohar
hep-ph/9407213
The Partonic Content of $h_1(x)$ and $h_2(x)
A light-cone wavefunction interpretation is presented for the polarized distribution functions $h_1(x)$ and $h_2(x)$. All matrix elements for moments of these distributions are given in terms of overlap integrals between Fock state amplitudes of the target state. In a suitable spinor basis, $h_1(x)$ involves only diago...
1994-07-03
2010-11-01
[ "hep-ph" ]
Arjun Berera
hep-ph/9407207
Fermion Scattering off a CP-Violating Electroweak BubbleWall II
By treating CP-violating interaction as a perturbative term, we solved in a previous paper the Dirac equation in the background of electroweak bubble wall, and obtained the transmission and reflection coefficients for a chiral fermion incident from the symmetric-phase region. We give the transmission and reflection coe...
1994-07-02
2009-09-25
[ "hep-ph" ]
K. Funakubo, A. Kakuto, S. Otsuki, K. Takenaga and F. Toyoda
hep-ph/9407208
The Infrared Fixed Point of the Top Quark Mass and its Implications within the MSSM
We analyse the general features of the Higgs and supersymmetric particle spectrum associated with the infrared fixed point solution of the top quark mass in the Minimal Supersymmetric Standard Model. We consider the constraints on the mass parameters, which are derived from the condition of a proper radiative electrowe...
1994-07-02
2009-09-25
[ "hep-ph" ]
M. Carena and C.E.M. Wagner
hep-ph/9412309
Limits on the Ununified Standard Model
The ununified standard model is an extension of the standard model that contains separate electroweak gauge groups for quarks and leptons. When it was originally proposed, data allowed the new gauge bosons to be quite light. We use recent data from precision electroweak measurements to put stringent bounds on the ununi...
1994-07-02
2008-11-26
[ "hep-ph" ]
R.S. Chivukula, E.H. Simmons and J. Terning
hep-ph/9407205
Photon structure and the $\mu$ puzzle
In this talk I first briefly explain the puzzle presented by the high muon content observed in air-showers which point to the ultra high-energy $\gamma$ sources like the HER-X-1. Since it had been suggested that a possible explanation of the puzzle might come from the effects of the hadronic structure of the photon, I ...
1994-07-02
2009-09-25
[ "hep-ph" ]
Rohini M. Godbole
hep-ph/9407209
Soft Supersymmetry Breaking Parameters and Minimal SO(10) Unification
The minimal supersymmetric SO(10) model, in which not only the gauge but also the third generation fermion Yukawa couplings are unified, provides a simple and highly predictive theoretical scenario for the understanding of the origin of the low energy gauge interactions and fermion masses. In the framework of the MSSM,...
1994-07-02
2009-09-25
[ "hep-ph" ]
M. Carena and C.E.M. Wagner
hep-ph/9407204
The Spin Dependence of Diffractive Processes and Implications for the Small $x$ Behaviour of $g_1$ and the Spin Content of the Nucleon
We show that if the Lorentz transformation properties of diffraction are other than scalar, the $x \rightarrow 0$ behaviour of $g_1(x,Q^2)$ can grow. We compare with new data on $g_1^p$ from SMC, assess implications for sum rules and for future studies of sea polarisation.
1994-07-01
2009-10-28
[ "hep-ph" ]
F.E. Close and R.G. Roberts (Rutherford Appleton Laboratory, UK.)
hep-ph/9407206
Exclusive Production of Higgs Bosons in Hadron Colliders
We study the exclusive, double--diffractive production of the Standard Model Higgs particle in hadronic collisions at LHC and FNAL (upgraded) energies. Such a mechanism would provide an exceptionally clean signal for experimental detection in which the usual penalty for triggering on the rare decays of the Higgs could ...
1994-07-01
2010-11-01
[ "hep-ph" ]
Hung Jung Lu and Joseph Milana
hep-ph/9407201
Unusual Events in Neutrino Telescopes: Signatures of New Physics
A class of physical phenomena outside the framework of the perturbatively treated Standard Model of electroweak and strong interactions gives rise to characteristic signatures in neutrino telescopes. In essence, the signature is a large energy deposition in the neighborhood of the telescope, giving rise to large and co...
1994-07-01
2009-09-25
[ "hep-ph" ]
G. Domokos and S. Kovesi-Domokos (Dept. of Physics and Astronomy, Johns Hopkins University, Baltimore, MD)
hep-ph/9407203
Negative s and Light New Physics
Motivated by the difference between SLD's recent measurement of ALR and the corresponding LEP results, we explore which kinds of new particles can (1) contribute dominantly to new physics through oblique corrections, (2) produce negative values for S and T, and (3) not be in conflict with any other experiments, on or o...
1994-07-01
2009-10-28
[ "hep-ph" ]
P. Bamert and C.P. Burgess
hep-ph/9407202
Weak Scale Threshold Corrections in Supersymmetric Models
I discuss the weak scale threshold corrections in supersymmetric models. I describe the ``match and run" approximation to the threshold corrections and compare with the exact one-loop results. With explicit examples I show that in cases without large hierarchies in the mass spectra the ``match and run" approximation ca...
1994-07-01
2007-05-23
[ "hep-ph" ]
Damien Pierce
hep-ph/9406436
Fermi motion parameter $p_F$ of $B$ meson from relativistic quark model
The Fermi motion parameter $p_{_F}$ is the most important parameter of ACCMM model, and the value $p_{_F} \sim 0.3$ GeV has been used without clear theoretical or experimental evidence. So, we attempted to extract the possible value for $p_{_F}$ theoretically in the relativistic quark model using quantum mechanical var...
1994-07-01
2007-05-23
[ "hep-ph" ]
Daesung Hwang, C.S. Kim and Wuk Namgung
hep-ph/9406435
The Donnachie-Landshoff Pomeron vs. QCD
The Donnachie-Landshoff model of diffractive scattering, which accounts for all confirmed diffractive data, is briefly reviewed. The picture emerging from this model is shown to directly contradict that coming from perturbative leading-log s calculations. The inclusion of non-perturbative effects brings the two picture...
1994-07-01
2007-05-23
[ "hep-ph" ]
J.R. Cudell
hep-ph/9406432
Leading electroweak correction to Higgs boson production at proton colliders
At proton colliders, Higgs particles are dominantly produced in the gluon--gluon fusion mechanism. The Higgs--gluons coupling is mediated by heavy quark loops, and the process can serve to count the number of heavy strongly interacting particles whose masses are generated by the Higgs mechanism. We present the two--loo...
1994-06-30
2011-01-13
[ "hep-ph" ]
A. Djouadi and P. Gambino
hep-ph/9406423
Family Symmetries and Proton Decay
The proton decay modes $p\to K^0 e^+$ and $p\to K^0 \mu^+$ may be visible in certain supersymmetric theories, and if seen would provide evidence for new flavor physics at extremely short distances. These decay modes can arise from the dimension five operator $(Q_1Q_1Q_2L_{1,2})$, where $Q_i$ and $L_i$ are ${i^{th}}$ ge...
1994-06-30
2009-09-29
[ "hep-ph" ]
Hitoshi Murayama (LBL) and D.B. Kaplan (INT, U. Washington)
hep-ph/9406427
New constraints on supergravity models from $b\to s\gamma$
We perform a detailed study of the constraints from $b\to s\gamma$ on a large class of supergravity models, including generic four-parameter supergravity models, the minimal $SU(5)$ supergravity model, and $SU(5)\times U(1)$ supergravity. For each point in the parameter spaces of these models we obtain a range of $B(b\...
1994-06-30
2009-08-25
[ "hep-ph" ]
J. Lopez, D. Nanopoulos, X. Wang, and A. Zichichi
hep-ph/9406428
QCD Corrections to $b\bar b/c\bar c$ Pair Production in Polarized $\gamma\gamma$ Collisions and the Intermediate Mass Higgs Signal
We present production rates of the two- and three-jet final states for the processes of massive $c\bar c/b\bar b$ quark production in circularly polarized photon-photon collisions, including QCD radiative corrections. Lowest order cross section, one-loop virtual correction and gluon emission correction are shown to be ...
1994-06-30
2011-01-25
[ "hep-ph" ]
George Jikia and Avto Tkabladze
hep-ph/9406434
Nonperturbative QCD Effects in Inclusive B Decays
In this talk I report calculable nonperturbative QCD effects to the inclusive semileptonic and radiative B-meson decay rates. Small instantons contribute to the Wilson coefficient functions at scales below $m_b$. It is found that the instantons give rise to a potentially large correction to the decay rate near the boun...
1994-06-30
2009-09-25
[ "hep-ph" ]
Soo-Jong REY (Seoul National University, Seoul, Korea)
hep-ph/9406433
The Search for Higgs Bosons: A Summary
I summarize the prospects for discovering Higgs bosons at future $pp$ and $\ee$ colliders both in the Standard Model and its Minimal Supersymmetric extension.
1994-06-30
2007-05-23
[ "hep-ph" ]
A. Djouadi
hep-ph/9406430
Higgs particles at future hadron and electron-positron colliders
The prospects for discovering Higgs particles and studying their fundamental properties at future high-energy electron-positron and hadron colliders are reviewed. Both the Standard Model Higgs boson and the Higgs particles of its minimal supersymmetric extension are discussed. We update various results by taking into a...
1994-06-30
2015-06-25
[ "hep-ph" ]
A. Djouadi
hep-ph/9406429
The SLD Asymmetry in View of the LEP Results
LEP determines $\sin^2 \theta_{\rm eff}$, by combining the various asymmetry measurements to be $0.2321 \pm 0.0005$. On the other hand, the left-right asymmetry as measured at SLC corresponds to \seff = $0.2292 \pm 0.0010$. I will discuss the possibilities of this being i) a statistical fluctuation, ii) a hint for New ...
1994-06-30
2010-11-01
[ "hep-ph" ]
Jens Erler
hep-ph/9406424
Radiative B-decay as a test of CKM unitarity
We point out that $R \equiv Br(b\rightarrow d \gamma)/Br(b\rightarrow s \gamma)$ is a sensitive probe of possible violation of CKM unitarity. We compute $R$ in a minimal extension of the Standard Model containing an additional isosinglet charge ($-1/3$) quark, which leads to a deviation from CKM unitarity.
1994-06-30
2010-11-01
[ "hep-ph" ]
Gautam Bhattacharyya, Gustavo C. Branco and Debajyoti Choudhury
hep-ph/9406431
QCD corrections to Higgs boson self--energies and fermionic decay widths
We present the QCD corrections to Higgs boson self-energies for arbitrary momentum transfer and for different internal quark masses, to treat the case of CP--even, CP--odd and charged Higgs bosons which appear in extensions of the Standard Model scalar sector. Using Ward Identities, we then relate these results obtaine...
1994-06-30
2014-11-17
[ "hep-ph" ]
A. Djouadi and P. Gambino
hep-ph/9406425
Introduction to Extended Nambu-Jona-Lasinio Models
A short introduction to quark models with four fermion terms and their predictions for the parameters of low-energy effective Lagrangians is given. Special attention is paid to predictions that are as general as possible. Contribution to the Second DAPHNE Physics Handbook, eds. L. Maiani, G. Pancheri and N. Paver.
1994-06-30
2007-05-23
[ "hep-ph" ]
Johan Bijnens
hep-ph/9406426
On the Ward Identities at Finite Temperature
We show both in 1+1 and 3+1 dimensions that, contrary to the recent suggestions, the contribution of the fermion loop to the polarization tensor is manifestly transverse at finite temperature. Some subtleties associated with the Ward identities at finite temperature are also pointed out.
1994-06-30
2015-06-25
[ "hep-ph", "hep-th" ]
Ashok Das and Marcelo Hott
hep-ph/9406418
Triangles, Triangles, Triangles: CP Violation in the B System and the Measurement of Strong and Weak Phases
We present the current wisdom regarding the measurement of the CP-violating phases of the CKM unitarity triangle in $B$-meson decays. After an introduction to the SM picture of CP violation, we review direct and indirect CP violation, the role of penguins and isospin analysis, and $B\to DK$ decays. We also discuss rece...
1994-06-29
2007-05-23
[ "hep-ph" ]
Oscar F. Hernandez and David London
hep-ph/9406417
Suppression of Proton Decay in the Missing-Partner Model for Supersymmetric SU(5) GUT
We construct a missing-partner model for supersymmetric SU(5) GUT assuming the Peccei-Quinn symmetry, in which the SU(5) gauge coupling constant remains in the perturbative regime below the gravitational scale $\sim2.4\times 10^{18}\GEV$. The Peccei-Quinn symmetry suppresses the dangerous dimension-five operators for t...
1994-06-29
2009-10-28
[ "hep-ph" ]
J. Hisano, T. Moroi, K. Tobe, and T. Yanagida
hep-ph/9406416
The Electroweak Chiral Lagrangian and CP-Violating Effects in Technicolor Theories
We estimate the CP-violating $WW\gamma$ and $WWZ$ anomalous form factors, arising from CP-violating interactions in extended technicolor theories, and discuss their future experimental detectability. The electric dipole moment of the $W$ boson is found to be as large as ${\cal O}(10^{-21}) \; \mbox{$e$ cm}$. We connect...
1994-06-29
2010-11-01
[ "hep-ph" ]
Thomas Appelquist and Guo-Hong Wu
hep-ph/9406419
Bounds on the Ratio of Higgs Vacuum Expectation Values in the Minimal Supersymmetric Standard Model from the Top and Bottom Quark Masses
The top quark mass values from the CDF Collaboration and the precision electroweak data at LEP combined with the bottom mass value allow to establish bounds on the parameter tan beta in the minimal supersymmetric standard model (MSSM) independent of the soft supersymmetry breaking parameters. We find: 0.96 < tan beta <...
1994-06-29
2007-05-23
[ "hep-ph" ]
V.A. Bednyakov, W. de Boer, S.G. Kovalenko
hep-ph/9406420
Topologically non--trivial chiral transformations: The chiral invariant elimination of the axial vector meson
The role of chiral transformations in effective theories modeling Quantum Chromo Dynamics is reviewed. In the context of the Nambu--Jona--Lasinio model the hidden gauge and massive Yang--Mills approaches to vector mesons are demonstrated to be linked by a special chiral transformation which removes the chiral field fro...
1994-06-29
2009-09-25
[ "hep-ph" ]
R. Alkofer, H. Reinhardt, J. Schlienz and H. Weigel
hep-ph/9406421
Branching ratio and direct CP-violating rate asymmetry of the rare decays $B \to K^\ast \gamma$ and $B \to \rho \gamma$
We calculate CP-violating rate asymmetries in the rare radiative decays $B^\pm\rightarrow K^{\ast\pm} \gamma$ and $B^\pm\rightarrow \rho^\pm \gamma$. They arise because of the interference between leading-order penguin amplitudes and one-gluon corrections with absorptive phases, and provide unambiguous evidence for dir...
1994-06-29
2010-11-01
[ "hep-ph" ]
C. Greub, H. Simma and D. Wyler
hep-ph/9406422
Thermal Activation Rates in the Chirally Asymmetric Gross-Neveu Model
We address the problem of how to incorporate quantum effects into the calculation of finite-temperature decay rates for a metastable state of a quantum field theory. To do this, we consider the Gross-Neveu model with an explicit chiral symmetry breaking term, which allows for a metastable state. This theory can be show...
1994-06-29
2010-11-01
[ "hep-ph" ]
D. Boyanovsky, David E. Brahm, R. Holman, Da-Shin Lee
hep-ph/9406410
Towards a unified theory of mesons and baryons
In this review we report on advances in topological soliton models of the nucleon. In chapter I we construct an effective lagrangian of QCD with the low mass mesons ($\pi,\rho,A_1$ and the scalar meson $\epsilon$) generalising the Skyrme model. The vector meson fields are introduced as massive gauge fields in the linea...
1994-06-28
2009-09-25
[ "hep-ph" ]
Dimitri Kalafatis
hep-ph/9406414
Minijets in gamma p and gamma gamma collisions
I discuss the minijet contribution to total photoproduction and photon--photon cross sections. While minijets with $p_T$ around 2 GeV have recently been observed directly in \gamgam\ experiments, the total \gamp\ cross section measured at HERA is in excellent agreement with predictions based on purely soft physics. Due...
1994-06-28
2009-09-25
[ "hep-ph" ]
Manuel Drees
hep-ph/9406412
CP Violation in the B System: What's Old, What's New?
I review the many ways of obtaining information about the CKM matrix through CP violation in the $B$ system. I include direct and indirect CP violation, the role of penguins and isospin analysis, tagging, and $B\to DK$ decays. I also discuss recent developments showing how to use $SU(3)$ flavor symmetry, along with som...
1994-06-28
2009-10-28
[ "hep-ph" ]
David London
hep-ph/9406415
Solution of the Strong CP problem in the low energy effective Standard Model
We consider the low energy effective chiral theory of QCD mesons and the electroweak Goldstone bosons. In this effective theory the pion sector contributes to the gauge boson masses and the Yukawa couplings of the fermions. Consequently the Yukawa sector of quarks and leptons can have a $SU(2)_L\times U(1)_Y\times U(1)...
1994-06-28
2007-05-23
[ "hep-ph" ]
Subhendra Mohanty
hep-ph/9406411
Top Quark Physics
Top quark studies at future $e^+e^-$ colliders are considered. Two issues are discussed: {a --}Some results are presented on the decays of top quarks. Energy distributions of charged leptons and neutrinos in $t\to bW\to be^+\nu$ and jets in $t\to bW\to b\bar du$ decays are sensitive to the structure of $tbW$ vertex. Di...
1994-06-28
2014-11-17
[ "hep-ph" ]
M. Je\.zabek
hep-ph/9406413
Strong WW Scattering at Photon Linear Colliders
We investigate the possibility of observing strong interactions of longitudinally polarized weak vector bosons in the process $\gamma \gamma \to ZZ$ at a photon linear collider. We make use of polarization of the photon beams and cuts on the decay products of the $Z$ bosons to enhance the signal relative to the backgro...
1994-06-28
2014-11-17
[ "hep-ph" ]
M. S. Berger and M. S. Chanowitz
hep-ph/9406408
Remarks on Koba-Nielsen-Olesen Scaling
It is shown that there is a second properly normalized KNO scaling function, $nP_n(n/\bar n)=\varphi(z)$, which has certain advantages in the analysis of KNO scaling. First, the $nP_n$ are not influenced by the statistical and systematic uncertainties of $\bar n$ hence $\varphi(z)$ provides more selective power than th...
1994-06-28
2009-10-28
[ "hep-ph", "hep-ex" ]
S. Hegyi
hep-ph/9406409
Inflatonless inflation
Whichever could be the real theory of gravitation, the corresponding low-energy effective lagrangian will probably contain higher derivative terms. In this work we study the general conditions on those terms in order to produce enough inflation to solve some of the problems of the standard Friedmann-Robertson-Walker ...
1994-06-28
2014-11-17
[ "hep-ph", "gr-qc" ]
A. Dobado and A. Lopez
hep-ph/9406407
Top Quark Contribution to Hadronic Decays of the Z-Boson at Alpha_s^2 in QCD
We evaluate the effect of a virtual top quark on the coefficient of $\alpha_{s}^{2}$ in the decay rates $\Gamma(Z \rightarrow {\rm hadrons})$ and $\Gamma(Z \rightarrow b\overline{b} )$. We treat the dependence on the top quark mass exactly instead of using a large mass expansion. The present work completes the evaluati...
1994-06-28
2009-10-28
[ "hep-ph" ]
Davison E. Soper and Levan R. Surguladze
hep-ph/9406405
Searching for the Higgs Boson(s)
The ability of LEP-200, the Tevatron, the Di-Tevatron, the LHC, and a next linear $\epem$ collider (NLC) to probe the Higgs sectors of the minimal Standard Model (SM) and the Minimal Supersymmetric Model (MSSM) is reviewed. Emphasis is placed on newly developed detection modes and on predictions for supersymmetric part...
1994-06-27
2011-01-25
[ "hep-ph" ]
J.F. Gunion
hep-ph/9406402
QCD S Parameter from Inhomogeneous Bethe-Salpeter Equation
We calculate the low-energy parameter S in QCD, which is also known as L_{10}, and the pion decay constant f_\pi using inhomogeneous Bethe-Salpeter equation in improved ladder approximation. To extract these quantities we calculate the ``V-A'' two-point function, \Pi_{VV}(q^2) - \Pi_{AA}(q^2), in space-like region. We ...
1994-06-27
2014-11-17
[ "hep-ph" ]
Masayasu Harada and Yuhsuke Yoshida
hep-ph/9406399
Nambu-Jona-Lasinio Model vs QCD
We argue that the extended Nambu-Jona-Lasinio model which introduces four-quark interactions to describe hadron physics at low energies can be confronted with fundamental quantum chromodynamics by means of spectral sum rules. While there arise rather restrictive bounds on the strength of the effective four-quark intera...
1994-06-27
2007-05-23
[ "hep-ph" ]
Koichi Yamawaki and V.I. Zakharov
hep-ph/9406403
Susy Particles
Analysis of the SUSY spectrum in supergravity unified models is given under the naturalness criterion that the universal scalar mass $(m_0)$ and the gluino mass $(m_{\tilde g})$ satisfy the constraint $m_0, m_{\tilde g}$ less than or equal to 1 TeV. The SUSY spectrum is analysed in four different scenarios: (1) minimal...
1994-06-27
2009-09-25
[ "hep-ph" ]
Pran Nath and R. Arnowitt
hep-ph/9406398
The Search for the Decay of Z Boson into Two Gammas as a Test of Bose Statistics
We suggest that Bose statistics for photons can be tested by looking for decays of spin-1 bosons into two photons. The experimental upper limit on the decay $Z \rightarrow \gamma \gamma $ is used to establish for the first time the quantitative measure of the validity of Bose symmetry for photons.
1994-06-27
2011-07-19
[ "hep-ph", "quant-ph" ]
A.Yu.Ignatiev, G.C.Joshi and M.Matsuda
hep-ph/9406400
Green functions from a gauge-invariant effective action for the electroweak Standard Model
Application of the background-field method to the electroweak Standard-Model yields a gauge-invariant effective action giving rise to simple Ward identities. We find that in the background-field `t Hooft-Feynman gauge the resulting vertex functions are exactly those that are obtained using the pinch technique. Thus, th...
1994-06-27
2009-10-28
[ "hep-ph" ]
A.Denner, S.Dittmaier, G.Weiglein
hep-ph/9406404
Calculation of two-loop self-energies in the electroweak Standard Model
Motivated by the results of the electroweak precision experiments, studies of two-loop self-energy Feynman diagrams are performed. An algebraic method for the reduction of all two-loop self-energies to a set of standard scalar integrals is presented. The gauge dependence of the self-energies is discussed and an extensi...
1994-06-27
2009-10-28
[ "hep-ph" ]
S. Bauberger, F.A. Berends, M. B\"ohm, M. Buza and G. Weiglein
hep-ph/9406406
Solvability, Consistency and the Renormalization Group in Large-$N_c$ Models of Hadrons
We establish the following fundamentals about Lagrangian models of meson-baryon interactions in the large-$N_{c}$ limit: 1. Calculating the leading-order contribution to $1$-meson/$2$-baryon Green's functions in the $1/N_c$ expansion involves summing an infinite class of divergent Feynman diagrams. So long as the bare ...
1994-06-27
2013-11-13
[ "hep-ph", "hep-lat", "nucl-th" ]
N. Dorey, J. Hughes, M. Mattis
hep-ph/9406401
Dynamical Electroweak Symmetry Breaking
We review the status of and recent developments in dynamical electroweak symmetry breaking, concentrating on the ideas of technicolour and top quark condensates. The emphasis is on the essential physical ideas and experimental implications rather than on detailed mathematical formalism.
1994-06-27
2010-12-17
[ "hep-ph" ]
Stephen F King
hep-ph/9406395
Four Weak Boson Production in Tev Photon--Photon Collisions and Heavy Higgs Signal
We study the signals for a heavy Higgs boson in the processes $\gamma\gamma\to WWWW$, $\gamma\gamma\to WWZZ$ at the photon linear collider. The results are based on the first complete tree level calculation for these reactions. Using a forward ``spectator" $W$ tag, central ``spectator" $W$ veto to suppress backgrounds ...
1994-06-26
2011-04-15
[ "hep-ph" ]
George Jikia
hep-ph/9406396
Treating Solar Model Uncertainties: A Consistent Statistical Analysis of Solar Neutrino Models and Data
We describe how to consistently incorporate solar model uncertainties, along with experimental errors and correlations, when analyzing solar neutrino data to derive confidence limits on parameter space for proposed solutions of the solar neutrino problem. Our work resolves ambiguities and inconsistencies in the previou...
1994-06-26
2008-11-26
[ "hep-ph", "astro-ph", "nucl-th" ]
Evalyn Gates, Lawrence M. Krauss, Martin White
hep-ph/9406397
Upper bound on Hot Dark Matter Density from $SO(10)$ Yukawa Unification
We study low-energy consequences of supersymmetric $SO(10)$ models with Yukawa unification $h_t = h_N$ and $h_b = h_\tau$. We find that it is difficult to reproduce the observed $m_b/m_\tau$ ratio when the third-generation right-handed neutrino is at an intermediate scale, especially for small $\tan \beta$. We obtain a...
1994-06-26
2009-09-29
[ "hep-ph" ]
Andrea Brignole, Hitoshi Murayama (LBL) and Riccardo Rattazzi (Rutgers U.)
hep-ph/9406394
Evidence for Gluon Energy Loss as the Mechanism for Heavy Quarkonium Suppression in $pA$ Collisions
We study the energy and nuclear A dependence of the hadronic production of heavy quarkonia. We review theoretical ideas which have been put forward, seeking a consistent global picture reconciling the large effects in quarkonia with the small nuclear effects observed in continuum Drell Yan production. The data indicate...
1994-06-25
2009-09-25
[ "hep-ph", "nucl-th" ]
Pankaj Jain and John P. Ralston
hep-ph/9406386
Fragmentation contribution to quarkonium production in hadron collision
We compute the contributions due to gluon and heavy-quark fragmentation to quarkonium production at large transverse momentum in $\bar p p$ and $p p$ collisions. For inclusive $J/\psi$ production, there is a large contribution from the $g \rightarrow \chi_c$ fragmentation. At large $p_T$, this is comparable to the conv...
1994-06-24
2009-10-28
[ "hep-ph" ]
D.P. Roy and K. Sridhar
hep-ph/9406391
CP Violation in $B^\pm\to \gamma\pi^\pm\pi^+\pi^-$
We consider CP violating effects in decays of the type $B^\pm\to \gamma a^\pm_{1,2}$ where $a_{1,2}$ are the $J^P=1^+$ and $2^+$ resonances each decaying to the common final state via $a^\pm_{1,2} \to\pi^\pm\rho^0$. The resonances enhance the CP asymmetries and also knowledge of their masses and widths facilitates calc...
1994-06-24
2010-11-01
[ "hep-ph" ]
D. Atwood and A. Soni
hep-ph/9406384
Electromagnetic Nucleon Properties and Quark Sea Polarization
In this paper we present the derivation as well as the numerical results for all electromagnetic form factors of the nucleon within the chiral quark soliton model in the semiclassical quantization scheme. The model is based on a semibosonized Nambu -- Jona-Lasinio lagrangean where the boson fields are treated as classi...
1994-06-24
2007-05-23
[ "hep-ph" ]
Chr.V. Christov, A.Z. G\'orski, K. Goeke and P.V. Pobylitsa
hep-ph/9406387
Note Added to ``Baryon Asymmetry of the Universe in the Standard Model"
Recent papers by Gavela et al. and Huet et al. claim to have shown that incluion of higher order interactions between quasiparticles dramatically decreases the baryon asymmetry of the universe which can arise in the Minimal Standard Model. These papers employ an inconsistent calculational scheme which, for instance, vi...
1994-06-24
2007-05-23
[ "hep-ph" ]
G. R. Farrar and M. E. Shaposhnikov
hep-ph/9406393
Exclusive and Semi-Inclusive B Decays Based on \hspace{0.3cm} b $\rightarrow$ s \hspace{0.01cm}$\eta_c$ \hspace{0.3cm} Transition
We calculate the semi-inclusive processes B $\rightarrow X_{s} \eta_c$ and relate it to B $\rightarrow X_{s} \psi$ in next to leading order QCD, and show how it can be used to determine an accurate value of $f_{\eta_{c}}$. The exclusive modes B $\rightarrow$ K$\eta_c$ and B $\rightarrow$ K$\psi$ also yield similar resu...
1994-06-24
2009-10-28
[ "hep-ph" ]
N. G. Deshpande and Josip Trampetic
hep-ph/9406390
Implications for Supersymmetric Dark Matter Detection from Radiative $b$ Decays
We point out that combinations of parameters that predict large counting rates in experiments searching for supersymmetric dark matter often tend to predict a very large branching ratio for the inclusive decay \bsg. The recent measurement of this branching ratio, therefore, indicates that searches for supersymmetric da...
1994-06-24
2016-09-01
[ "hep-ph" ]
Francesca M. Borzumati, Manuel Drees and Mihoko M. Nojiri
hep-ph/9406392
Power Suppressed Corrections to Hadronic Event Shape Variables
For high energy processes ($M\gg \Lambda_{QCD}$) there are infrared safe hadronic shape variables that have a calculable perturbative expansion in $\alpha_s(M^2)$. However, nonperturbative power suppressed corrections to these variables are not well understood. We use the behavior of large orders of the perturbation ex...
1994-06-24
2009-10-28
[ "hep-ph" ]
Aneesh V. Manohar and Mark B. Wise
hep-ph/9406388
String-Organized Field Theory
A low energy string theory should reduce to an ordinary quantum field theory, but in reality the structures of the two are so different as to make the equivalence obscure. The string formalism is more symmetrical between the spacetime and the internal degrees of freedom, thus resulting in considerable simplification in...
1994-06-24
2007-05-23
[ "hep-ph", "hep-th" ]
C.S. Lam
hep-ph/9406389
$b \rightarrow s\gamma$ Decay in Supergravity Grand Unification and Dark Matter
An analysis of the $b \rightarrow s\gamma$ is given in supergravity grand unification using the framework of the radiative breaking of the electro-weak symmetry under three separate sets of constraints:1) neutralino relic density does not overclose the universe,2)p-stability constraint, and 3) the combined constraints ...
1994-06-24
2009-09-25
[ "hep-ph" ]
Pran Nath and R. Arnowitt
hep-ph/9406385
A Direct Test of Perturbative QCD at Small x
We show that recent data from HERA on the proton structure function $F_2$ at small $x$ and large $Q^2$ provide a direct confirmation of the double asymptotic scaling prediction of perturbative QCD. A linear rise of $\ln F_2$ with the scaling variable $\sigma$ is observed throughout the kinematic region probed at HERA, ...
1994-06-24
2009-10-28
[ "hep-ph", "hep-ex" ]
R. D. Ball and S. Forte
hep-ph/9406383
On Hyperfine Splittings of Strange Baryons in the Skyrme Model
We calculate the complete order $1/N$ corrections to baryon masses in the rigid rotator approach to the 3-flavor Skyrme model.
1994-06-23
2013-11-13
[ "hep-ph" ]
Karl M. Westerberg and Igor R. Klebanov
hep-ph/9406372
Boron neutrino flux and the MSW solution of the solar neutrino problem
There are large uncertainties in the predictions of the boron neutrino flux from the Sun which cannot be considered as being of purely statistical origin. We treat the magnitude of this flux, $\Phi_B$, as a parameter to be found from experiment. The properties of the MSW solution to the solar neutrino problem for diffe...
1994-06-23
2009-09-25
[ "hep-ph", "astro-ph" ]
P.I.Krastev and A.Yu.Smirnov
hep-ph/9406381
W and Z Polarization Effects in Hadronic Collisions
A Monte Carlo study of the polar and azimuthal angular distributions of the lepton pair arising from the decay of a $W$ or $Z$ boson produced at high transverse momentum in hadronic collisions is presented. In the absence of cuts on the final state leptons, the lepton angular distribution in the gauge boson rest frame ...
1994-06-23
2009-10-28
[ "hep-ph" ]
E. Mirkes and J.Ohnemus
hep-ph/9406382
Parton Distributions in the Photon
We discuss in detail the photon structure function beyond the leading logarithm approximation. Of special concern is the factorization scheme and the hadronic input; we show how to naturally absorb large terms due to the MSbar factorization scheme in a modified hadronic component. The effect of the charm quark mass thr...
1994-06-23
2014-11-17
[ "hep-ph" ]
P.Aurenche, M.Fontannaz, J.Ph.Guillet
hep-ph/9406377
Role of Scalar Meson Resonances in $K_{L}^{0} \rightarrow \pi^{0} \gamma \gamma Decay
Corrections to $K_{L}^{0}\rightarrow \pi^{0} \gamma \gamma$ decay induced by scalar meson exchange are studied within chiral perturbation theory. In spite of bad knowledge of scalar-mesons parameters, the calculated branching ratio can be changed by a few percent.
1994-06-23
2009-10-28
[ "hep-ph" ]
S.Fajfer
hep-ph/9406373
Extended Nambu-Jona-Lasinio Model vs QCD Sum Rules
We argue that the extended Nambu-Jona-Lasinio model of hadrons can be be probed and constrained in a nontrivial way via QCD sum rules. While there arise rather restrictive bounds on the strength of the effective four-fermion interaction in the vector channel, introduction of the four-fermion interaction in the pseudosc...
1994-06-23
2007-05-23
[ "hep-ph" ]
Koichi Yamawaki and V.I. Zakharov
hep-ph/9406374
Tevatron and LEP-II Probes of Minimal and String-Motivated Supergravity Models
We explore the ability of the Tevatron to probe Minimal Supersymmetry with high energy scale boundary conditions motivated by supersymmetry breaking in the context of supergravity/superstring theory. A number of boundary condition possibilities are considered: dilaton-like string boundary conditions applied at the stan...
1994-06-23
2009-10-28
[ "hep-ph" ]
H. Baer, J.F. Gunion, C. Kao and H. Pois