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hep-ph/9406375
Vector-like Strong Coupling theory with small S and T parameters
We propose a mechanism which can reduce the Peskin and Takeuchi's S, T and U parameters in dynamical electroweak symmetry breaking models. It is interesting that not only S but also T parameter can become small even if there exists large isospin violation in fermion condensation. For example, when we take the $SU(2)_L\...
1994-06-23
2017-02-01
[ "hep-ph" ]
Nobuhiro Maekawa
hep-ph/9406376
Sensitivity Of Dark Matter Dectectors To Susy Dark Matter
The sensitivity of dark matter detectors to the lightest neutralino (${\tilde {Z}_1}$) is considered within the framework of supergravity grand unification with radiative breaking of SU(2)xU(1). The relic density of the ${\tilde {Z}_1}$ is constrained to obey $0.10 \leq \Omega_{\tilde {Z}_1}h^2 \leq 0.35$, consistent w...
1994-06-23
2009-09-25
[ "hep-ph", "hep-ex" ]
R. Arnowitt
hep-ph/9406379
Characteristics of Cosmic String Scaling Configurations
Using the formalism developed in a previous paper we analyze the cosmological implications of our conclusions concerning the scaling behaviour of a network of cosmic strings, in particular the idea that once gravitational back-reaction becomes important the transient scaling regime so far explored by numerical simulati...
1994-06-23
2010-01-06
[ "hep-ph", "astro-ph" ]
Daren Austin, E.J. Copeland and T.W.B. Kibble
hep-ph/9406380
Scale Anomaly Induced Instanton Interaction
The binary interaction of large size instantons in a SU(2) Yang-Mills theory is obtained from the one-loop effective action for the field strength. The instanton interaction is calculated as a function of the instanton separation and in dependence on radius and relative orientation of the instantons. Two equally orient...
1994-06-23
2009-10-28
[ "hep-ph" ]
K. Langfeld, H. Reinhardt
hep-ph/9406378
On the Role of the Higgs Mechanism in Present Electroweak Precision Tests
Based on the observables $\MW$, $\Gamma_l$, $\bar\sw^2(\MZ^2)$, we evaluate the parameters $\Delta x, \Delta y$ and $\varepsilon$ at one-loop level within an electroweak massive vector-boson theory, which does not employ the Higgs mechanism. The theoretical results are consistent with the experimental ones on $\Delta x...
1994-06-23
2009-10-28
[ "hep-ph" ]
S. Dittmaier, C. Grosse-Knetter and D. Schildknecht (University of Bielefeld, Department of Theoretical Physics)
hep-ph/9406360
Intermittency and Exotic Channels
It is pointed out that accurate measurements of short-range two-particle correlations in like-charge $ K\pi $ and in $ \pi^ 0\pi^ 0$ channels should be very helpful in determining the origin of the \lq\lq intermittency\rq\rq\ phenomenon observed recently for the like-charge pion pairs.
1994-06-22
2008-11-26
[ "hep-ph" ]
A. Bialas and R. Peschanski
hep-ph/9406359
Heavy baryons
We review the experimental and theoretical status of baryons containing one heavy quark. The charm and bottom baryon states are classified and their mass spectra are listed. The appropriate theoretical framework for the description of heavy baryons is the Heavy Quark Effective Theory, whose general ideas and methods ar...
1994-06-22
2011-01-25
[ "hep-ph" ]
J.G. Koerner, D. Pirjol, M. Kraemer
hep-ph/9406368
On the Spontaneous CP Breaking at Finite Temperature in a Nonminimal Supersymmetric Standard Model
We study the spontaneous CP breaking at finite temperature in the Higgs sector in the Minimal Supersymmetric Standard Model with a gauge singlet. We consider the contribution of the standard model particles and that of stops, charginos, neutralinos, charged and neutral Higgs boson to the one-loop effective potential. P...
1994-06-22
2010-11-01
[ "hep-ph" ]
D. Comelli, M. Pietroni and A. Riotto
hep-ph/9406362
Renormalization Group for Multiparticle Production in (2+1) Dimensions Around the Threshold
Multiparticle production in (2+1) dimensions is investigated. We show that in a small region around the threshold the perturbation theory becomes unapplicable due to infrared divergencies in a class of Feynman graphs with rescattering in final state. We develop a technique based on renormalization group for summing up ...
1994-06-22
2007-05-23
[ "hep-ph" ]
V. A. Rubakov and D. T. Son
hep-ph/9406367
Some model-independent properties of quark mixing
We discuss some new invariants of quark mixing and show their usefulness with a simple example. We also present some other new tools for analyzing quark mixing.
1994-06-22
2007-05-23
[ "hep-ph" ]
A. Kusenko
hep-ph/9406357
Fermion and Sfermion Effects in $e^+ e^-$ charged Higgs pair production
Top and bottom one loop corrections to $e^+e^-\rightarrow H^+ H^-$ are considered at NLC energies and found to be significantly large and negative over the full range of $tan \, \beta$. Moreover, loop effects of moderately heavy squarks and sleptons in the minimal supersymmetric extension of the standard model, tend to...
1994-06-22
2009-10-28
[ "hep-ph" ]
A. Arhrib, M. Capdequi Peyranere and G. Moultaka
hep-ph/9406364
Patterns of quark mass matrices in a class of Calabi-Yau models
We study a class of superstring models compactified in the 3-generation Calabi-Yau manifold of Tian and Yau. Our analysis includes the complete $E_6$-singlet sector, which has been recently evaluated using techniques of spectral and exact sequences. We use the discrete symmetries of the models to find flat directions o...
1994-06-22
2009-10-28
[ "hep-ph" ]
F. del Aguila, M. Masip and L. da Mota
hep-ph/9406361
Semileptonic B-Meson Decays in the Parton Model
We study the inclusive semileptonic B decays in the parton model. The model gives a decay spectrum which is in excellent agreement with experiment and makes several predictions to be tested in the forseeable future.
1994-06-22
2009-09-25
[ "hep-ph" ]
C.H. Jin, W.F. Palmer, and E.A. Paschos
hep-ph/9406369
On Spontaneous Baryogenesis and Transport Phenomena
The spontaneous baryogenesis mechanism by Cohen, Kaplan and Nelson is reconsidered taking into account the transport of particles inside the electroweak bubble walls. Using linear response theory, we calculate the modifications on the thermal averages of the charges of the system due to the presence of a space time dep...
1994-06-22
2011-05-23
[ "hep-ph" ]
D. Comelli, M. Pietroni, and A. Riotto
hep-ph/9406363
$O(\alpha \alpha_s^2)$ correction to the electroweak $\rho$ parameter
The three-loop QCD contributions to the vacuum polarization functions of the $Z$ and $W$ bosons at zero momentum are calculated. The top quark is considered to be massive and the other quarks massless. Using these results, we calculate the correction to the electroweak $\rho$ parameter. All computations are done in the...
1994-06-22
2011-01-13
[ "hep-ph" ]
L. Avdeev, J. Fleischer, S. Mikhailov, O. Tarasov
hep-ph/9406358
Neutrino Mass and Magnetic Moment from Neutrino-Electron Scattering
We study both the elastic ($\nu e \rightarrow \nu e$) and the radiative process ($\nu e \rightarrow \nu e \gamma$) and discuss how these processes can shed light on some current topics in neutrino physics such as a neutrino magnetic moment and neutrino oscillations. The radiative process allows to reach low values of $...
1994-06-22
2016-08-14
[ "hep-ph" ]
J. Bernab\'eu, S.M. Bilenky, F.J. Botella, J.A. Pe\~narrocha and J. Segura
hep-ph/9406370
Jets in Photon-Photon Collisions
We study jet production in photon-photon reactions at the next-to-leading logarithm accuracy. The discussion of the theoretical uncertainties and the role of the quark and gluon distributions in the photon is emphasized. The phenomenology at TRISTAN energies is discussed and predictions are made for LEP 200.
1994-06-22
2009-09-25
[ "hep-ph" ]
M. Fontannaz
hep-ph/9406371
A Model for the Three Lepton Decay Mode of the Proton
An extension of the left--right symmetric model has been constructed which gives in a natural way the three lepton decay modes of the proton which have been suggested as an explanation for the atmospheric neutrino anomaly. We write down the potential which after minimization gives the proper choice of the Higgs spectru...
1994-06-22
2009-09-25
[ "hep-ph" ]
Biswajoy Brahmachari, Patrick J. O'Donnell and Utpal Sarkar
hep-ph/9406365
Quark-Gluon Plasma Freeze-Out from a Supercooled State?
The quark-gluon plasma, formed in the first 3 fm/c of the heavy ion collisions at RHIC and LHC, supercooles due to nucleation and develops soon a negative pressure in the bag model. The negative pressure yields mechanical instability which may lead to a sudden timelike deflagration to a (super)heated hadron gas. The re...
1994-06-22
2009-10-28
[ "hep-ph", "nucl-th" ]
T. Csorgo and L. P. Csernai
hep-ph/9406366
Using Gauge Coupling Unification and Proton Decay to Test Minimal Supersymmetric SU(5)
We derive a one-loop expression, including all thresholds, for the mass of the proton decay mediating color triplets, $M_{D^c}$, in minimal supersymmetric SU(5). The result for $M_{D^c}$ does not depend on other heavy thresholds or extra representations with SU(5) invariant masses which might be added to the minimal mo...
1994-06-22
2011-07-19
[ "hep-ph" ]
John S. Hagelin, S. Kelley, and Veronique Ziegler
hep-ph/9406352
Heavy Flavours Leptonic and Semi-leptonic Decays on the Lattice
We present some results of the {\bf{ELC}} (European Lattice Collaboration) study of leptonic and semi-leptonic decays of heavy-light mesons. Results on the decay constants $f_D, f_{D_s}$ and $f_B, f_{B_s}$, the semi-leptonic form factors of $D\longrightarrow K (K^*)$ and some preliminary estimates of form factors rel...
1994-06-21
2007-05-23
[ "hep-ph" ]
As. Abada
hep-ph/9406356
A Note on Spontaneous Baryogenesis
The original calculation of `spontaneous' baryogenesis overlooked the role played by transport of particles onto the bubbles wall. For typical `adiabatic' wall thicknesses and velocities one can model the problem in a fluid approximation and the mechanism is best understood as another limit of `charge transport' baryog...
1994-06-21
2007-05-23
[ "hep-ph" ]
Michael Joyce
hep-ph/9406347
Vector Leptoquarks Could Be Rather Light?
Some low-energy manifestations of a minimal extension of the Standard Model based on the quark-lepton $SU(4)_V \otimes SU(2)_L \otimes G_R$ symmetry of the Pati-Salam type are analysed. Given this symmetry a new type of mixing in the quark-lepton interactions is shown to be required. An additional arbitrariness of the ...
1994-06-21
2008-11-26
[ "hep-ph" ]
A.V. Kuznetsov and N.V. Mikheev
hep-ph/9406354
Bounds on the Masses and Couplings of Leptoquarks from Leptonic Partial Widths of the Z
The vertex corrections to the leptonic partial widths of the $Z$ induced by leptoquarks that couple leptons to the top quark are considered. We obtain stringent bounds on the parameter space of the masses and Yukawa couplings of these leptoquarks, using the latest information on the $Z \rightarrow l^+l^-$ decay widths ...
1994-06-21
2009-09-25
[ "hep-ph" ]
Gautam Bhattacharyya, John Ellis and K. Sridhar
hep-ph/9406355
Electroweak Baryogenesis with Topological Defects
Electroweak baryogenesis has become a topic of much recent activity [1]. Here we discuss a new scenario which has the advantage of being insensitive to the order of the electroweak phase transition. We briefly review a mechanism [2] using unstable electroweak strings [3] and discuss in detail a mechanism [4] using topo...
1994-06-21
2009-09-25
[ "hep-ph", "astro-ph" ]
A.C. Davis (DAMTP, Cambridge), R. Brandenberger and M. Trodden (Brown University)
hep-ph/9407246
The Top Quark and the Higgs Boson Mass from LEP SLC and CDF Data
The impact of the new experimental data from LEP, SLC and CDF on the top quark mass and the Higgs boson mass is investigated. The determinations of m_{top} and of an upper bound on m_{Higgs} are given, taking into account the experimental error on the QED coupling constant \alpha_{em} and on the b-quark mass m_b. The r...
1994-06-21
2009-09-25
[ "hep-ph" ]
Guido Montagna, Oreste Nicrosini, Giampiero Passarino and Fulvio Piccinini
hep-ph/9406350
The small $x$ behaviour of $g_1$
We discuss the small $x$ behaviour of the spin dependent structure function $g_1$. We find a contribution from the exchange of two non-perturbative gluons which behaves as $\sim ( 2 \ln {1 \over x} -1)$.
1994-06-21
2009-10-28
[ "hep-ph" ]
S D Bass and P V Landshoff
hep-ph/9406351
Generation Permutation Symmetry and the Quark Mixing Matrix
We propose a new discrete symmetry in the generation space of the fundamental fermions, consistent with the observed fermion mass spectrum. In the case of the quarks, the symmetry leads to the unique prediction of a flat CKM matrix at high energy. We explore the possibility that evolution due to quantum corrections lea...
1994-06-21
2014-11-17
[ "hep-ph" ]
P. F. Harrison and W. G. Scott
hep-ph/9406348
Direct $CP$ Violation in a Variety of $B$ Decays
We give a brief review of direct $CP$ violation effects in charmless $B$ decays, both at the inclusive and at the exclusive level. It is emphasized that typical exclusive final states are composed of 2--4 $K$ or $\pi$'s, hence particle identification (in terms of $K/\pi$ separation) is of crucial importance for studyin...
1994-06-21
2015-06-25
[ "hep-ph" ]
George W. S. Hou
hep-ph/9406346
Constraints on the minimal supergravity model from the b->s+\gamma decay
The constraints on the minimal supergravity model from the b->s+\gamma decay are studied. A large domain in the parameter space for the model satisfies the CLEO bound, BR(b->s+\gamma)<5.4X10^{-4}. However, the allowed domain is expected to diminish significantly with an improved bound on this decay. The dependence of t...
1994-06-21
2009-09-25
[ "hep-ph" ]
Jizhi Wu, Richard Arnowitt, and Pran Nath
hep-ph/9406349
Comments on the Standard Model of Electroweak Interactions
The Standard Model of electroweak interactions is shown to include a gauge theory for the observed scalar and pseudoscalar mesons. This is done by exploiting the consequences of embedding the SU(2)left X U(1) group into the chiral group of strong interactions and by considering explicitly the Higgs boson and its three ...
1994-06-21
2009-10-28
[ "hep-ph", "hep-th" ]
B. Machet
hep-ph/9406353
Hadronic Molecules and Low-Energy Hadron-Hadron Scattering Amplitudes
Recently there has been considerable interest in the subject of molecules, which are weakly bound states of hadron pairs. The question of the existence of molecules is closely related to the more general problem of the determination of low energy hadron-hadron scattering amplitudes, which is widely believed to require ...
1994-06-21
2015-06-25
[ "hep-ph" ]
T.Barnes (Physics Division, Oak Ridge National Laboratory and Department of Physics and Astronomy, University of Tennessee)
hep-ph/9406341
B Decays, an Introductory Survey
To start the $b$-decay session we briefly introduce and comment some important theoretical tools which are currently used in $b$ physics. Heavy Quark Symmetry and its consequences for heavy to heavy and heavy to light semi-leptonic decays, as well as for leptonic decays, are briefly summarised. It is stressed that symm...
1994-06-20
2008-02-03
[ "hep-ph" ]
A. Le Yaouanc, L Oliver, O.P\`ene, J.-C. Raynal
hep-ph/9406345
Diffusion Enhances Spontaneous Electroweak Baryogenesis
We include the effects of diffusion in the electroweak spontaneous baryogenesis scenario and show that it can greatly enhance the resultant baryon density, by as much as a factor of $1/\alpha_w^4 \sim 10^6$ over previous estimates. Furthermore, the baryon density produced is rather insensitive to parameters characteriz...
1994-06-20
2009-10-28
[ "hep-ph" ]
A. G. Cohen, D. B. Kaplan, A. E. Nelson
hep-ph/9406344
Top-Quark Production and Flavor Physics
Because of the top quark's very large mass, about 175~GeV, it now provides the best window into flavor physics. Thus, pair--production of top quarks at the Tevatron Collider is the best probe of this physics until the Large Hadron Collider turns on in the next century. I will discuss aspects of the mass and angular dis...
1994-06-20
2007-05-23
[ "hep-ph", "hep-ex" ]
Kenneth Lane
hep-ph/9406340
Semi-Analytical Approach to Four-Fermion Production in $e^+ e^-$ Annihilation
A study of the semi-analytical approach to four-fermion production in $e^+ e^-$ annihilation is presented. We classify all possible four-fermion final states and present results of new calculations for the `basic' processes with the $WW,ZZ$, and $ZH$ off-shell production together with some examples of `background' proc...
1994-06-20
2009-10-28
[ "hep-ph" ]
D. Bardin, M. Bilenky, D. Lehner, A. Olchevski, T. Riemann
hep-ph/9406343
Cosmic Strings and Electroweak Symmetry Restoration in the Two-Higgs Doublet Model
We investigate the region of restored electroweak symmetry around a superconducting cosmic string coupled to the Weinberg-Salam model with an extra Higgs doublet. We show that the presence of the extra Higgs fields, and in particular their CP violating relative phase, does not qualitatively affect the results of Perkin...
1994-06-20
2015-06-25
[ "hep-ph" ]
M. Trodden (Brown University)
hep-ph/9406342
Structure Dependence in $\pi \to \bf\ell\nu, \pi\ to \ell\nu\gamma$ and $\pi^0\ to \gamma\gamma$ Decays
The amplitudes of $\pi$-meson decays are calculated in a relativistic nonperturbative quark model which assumes that mesons are made of a quark antiquark pair and of a scalar neutral component representing the contribution of the nonelementary fluctuations of the quark gluonic field. The experimental data can be fitted...
1994-06-20
2009-10-28
[ "hep-ph" ]
D. Ghilencea, L. Micu
hep-ph/9406337
Possible Detection of a Higgs Boson at Higher Luminosity Hadron Colliders
We have examined how a Standard Model or Supersymmetric Higgs boson h might be detected at possible hadron colliders. The channels W(to ell nu)h(to b b~), Z(to ell ell~)h(to b b~) and W/Z(to jets)h(to tau+ tau-) are most useful. The results imply that h with mass M_h can be detected or excluded for M_h between about 80...
1994-06-18
2016-09-01
[ "hep-ph" ]
Stephen Mrenna and G.L. Kane
hep-ph/9406338
Heavy Meson Radiative Decays and Light Vector Meson Dominance
Electromagnetic interactions are introduced in the effective chiral Lagrangian for heavy mesons which includes light vector particles. A suitable notion of vector meson dominance is formulated. The constraints on the heavy meson -light vector and heavy meson-light pseudoscalar coupling constants are obtained using expe...
1994-06-18
2014-11-17
[ "hep-ph" ]
Pankaj Jain, Arshad Momen and Joseph Schechter
hep-ph/9406334
B To Light Meson Form Factors
The heavy to light form factors in $B$ decays are discussed. Critical discussion of theoretical approaches is made with special emphasis on their failure to describe the $B \to K^{(\ast )}\psi$ data.
1994-06-17
2007-05-23
[ "hep-ph" ]
R. Aleksan, A. Le Yaouanc, L. Oliver, O.P\`ene, J.-C. Raynal
hep-ph/9406332
Interaction of Wilson Loops in the SU(N) Gauge Theory
The average of two Wilson loops is expressed in terms of gauge invariant field strength correlators. Assuming the existence of finite correlation length $T_g$ and taking into account the absence of a fixed direction in colour space, we generalize the area law asymptotics for the case of the average of two Wilson loops ...
1994-06-17
2009-09-25
[ "hep-ph" ]
A.Yu.Dubin and Yu.S.Kalashnikova
hep-ph/9406335
Non Standard Tau Pair Production in Two Photon Collisions at LEP II and Beyond
We study the sensitivity of LEP II and NLC, via two photon collisions, to the effects of anomalous $\tau \overline{\tau} \gamma$ couplings. We also discuss some CP-odd observables that can be useful to disentangle the contributions from the anomalous couplings. (5 figures included via epsf appended at the end as uuenco...
1994-06-17
2010-11-01
[ "hep-ph" ]
Fernando Cornet and J.I. Illana
hep-ph/9406333
SO(10) SUSY GUTs and Fermion Masses
In this talk~\footnote{Talk presented at the IFT Workshop on Yukawa Couplings, Gainesville, FL, February 1994.} I summarize published work on a systematic operator analysis for fermion masses in a class of effective supersymmetric SO(10) GUTs \cite{adhrs}~\footnote{This work is in collaboration with G. Anderson, S. Dim...
1994-06-17
2007-05-23
[ "hep-ph" ]
Stuart Raby
hep-ph/9406336
The Z Line-shape in the Standard Model
The status of the theoretical uncertainties for LEP1 observables associated with the corresponding comparison among different codes is briefly reviewed.
1994-06-17
2009-10-28
[ "hep-ph" ]
Giampiero Passarino
hep-ph/9406329
Mass of the charm-quark from QCD sum rules
Relativistic and non-relativistic ratios of Laplace transform QCD moment sum rules for charmonium are used in order to determine the value of the on-shell charm-quark mass. The validity of the non-relativistic version of QCD sum rules in this particular application is discussed. After using current values of the pertur...
1994-06-16
2009-10-28
[ "hep-ph" ]
C.A.Dominguez, G.R.Gluckman, and N.Paver
hep-ph/9406325
Low-x Structure Functions
QCD predictions on the low-$x$ behaviour of the structure functions are reviewed and compared with the recent measurements of $F_2(x,Q^2)$ at HERA. The present theoretical accuracy of these predictions is discussed.
1994-06-16
2009-09-25
[ "hep-ph" ]
Stefano Catani
hep-ph/9406331
Hadron collider limits on anomalous $WW\gamma$ couplings
A next-to-leading log calculation of the reactions $pp$ and $p\overline{p}\rightarrow W^\pm\gamma X$ is presented including a tri-boson gauge coupling from non-Standard Model contributions. Two approaches are made for comparison. The first approach considers the tri-boson $WW\gamma$ coupling as being uniquely fixed by ...
1994-06-16
2009-10-28
[ "hep-ph" ]
Kevin R. Barger and M. H. Reno
hep-ph/9406327
A New Solution of the Solar Neutrino Flux
We report a new solution to explain the observed deficit of the solar neutrino flux by Homestake, Kamiokande II and III, GALLEX and SAGE experiments. We use the matter mixing and the helicity oscillation in the twisting magnetic fields in the sun. Our model predicts the short (seasonal) and long (11 years) time variati...
1994-06-16
2017-02-01
[ "hep-ph" ]
K. Ohta and E. Takasugi
hep-ph/9406330
Search for New Physics in e-e- Scattering
Considering the physics potential of an e-e- collider in the TeV energy range, we indicate a few interesting examples for exotic processes and discuss the standard model backgrounds. Focussing on pair production of weak gauge bosons, we report some illustrative predictions.
1994-06-16
2009-10-28
[ "hep-ph" ]
F. Cuypers, K. Kolodziej and R. Rueckl
hep-ph/9406328
Automatically R-Conserving SUSY SO(10) Models and Mixed Light Higgs Doublets
In automatic R-parity conserving SO(10) models, the simplest way to accomodate realistic fermion masses is to demand that that the light Higgs doublets be linear combinations of the {10} and {126}-bar grand unified Higgs representations. We study the realization of this mixed light Higgs property consistent with double...
1994-06-16
2009-10-28
[ "hep-ph" ]
Dae-Gyu Lee and R. N. Mohapatra
hep-ph/9406323
In Search of Classical Trajectories
This short talk summarizes some important issues relevant to a new Minkowski space formulation of nonperturbative contributions to quantum scattering. Details may be found in hep-ph/9403353. (To appear in Proceedings of 1994 NATO Advanced Research Workshop)
1994-06-16
2007-05-23
[ "hep-ph" ]
Thomas M. Gould
hep-ph/9406324
Bounds on $g_5^Z$ from Precision LEP Measurements
The parity violating but CP conserving anomalous three-gauge-boson coupling $g_5^Z$ induces a universal contribution to the left-handed coupling of the $Z$ boson to fermions. We find that the LEP measurements of the partial $Z$ widths and lepton forward-backward asymmetries are sufficiently precise to place a bound of ...
1994-06-16
2009-10-28
[ "hep-ph" ]
S. Dawson and G. Valencia
hep-ph/9406314
Unification of Fundamental Interactions in Supersymmetry
A review is given of recent developments on the implications of supergravity grand unification with SU(5)-type proton decay under the condition $M_{H_3} /m_G < 10$ (where $M_{H_3}$ is the Higgs triplet mass) and the naturalness condition that the universal scalar mass $m_0$ and the gluino mass are $<$ 1~TeV. It is show...
1994-06-15
2009-09-25
[ "hep-ph" ]
Pran Nath and R. Arnowitt
hep-ph/9406318
The Free Energy of Hot QED at Fifth Order
The order $e^5$ contribution to the pressure of massless quantum electrodynamics at nonzero temperature is determined explicitly. An identity is also obtained relating a gauge-invariant piece of the pressure at order $e^{2n+3} \ (n \ge 1) $ (from diagrams with only one fermion loop) to the pressure at order $e^{2n}$.
1994-06-15
2009-10-28
[ "hep-ph", "hep-th" ]
Rajesh R. Parwani
hep-ph/9406317
Anomalous quartic couplings in $ W^+W^- \gamma $ production at $e^+e^- $ colliders
We study the process $e^+e^- \rightarrow W^+W^- \gamma$ at high-energy $e^+ e^-$ colliders to investigate the effect of genuine quartic $W^+W^-\gamma\gamma$ and $W^+W^- Z\gamma$ anomalous couplings on the cross section. Deviations from the Standard Model predictions are quantified. We show how bounds on the anomalous c...
1994-06-15
2009-10-28
[ "hep-ph" ]
Ghadir Abu Leil, W.J. Stirling
hep-ph/9406321
Production of Pairs of Sleptoquarks in Hadron Colliders
We calculate the cross section for the production of pairs of scalar leptoquarks (sleptoquarks) in a supersymmetric $E_6$ model, at hadron colliders. We estimate higher order corrections by including $\pi^2$ terms induced by soft-gluon corrections. Discovery bounds on the sleptoquark mass are estimated at collider ener...
1994-06-15
2009-10-28
[ "hep-ph" ]
M. de Montigny, L. Marleau, and G. Simon
hep-ph/9406326
Low Energy Parameters of the KK and Pipi Scalar-Isoscalar Interactions
Threshold expansions of the $\pi\pi$ and $K\overline{K}$ spin 0 and isospin 0 scattering amplitudes are performed. Scattering lengths, effective ranges and so--called volume parameters are evaluated. Good agreement with the existing experimental data for the $\pi\pi$ scalar--isoscalar amplitude is found. An importance ...
1994-06-15
2009-10-28
[ "hep-ph" ]
R. Kaminski and L. Lesniak
hep-ph/9406313
CP Conserving and Violating Contributions to $K_L\to\pi^+\pi^-\nu\bar{\nu}$
We study both CP conserving and violating contributions to the decay $K_L\to\pi^+\pi^-\nu\bar{\nu}$. We find that the decay branching ratio is dominated by the CP conserving part. In the standard CKM model, we estimate that for $m_t\sim 174\ GeV$, the branching ratio due to the CP conserving (violating) contributions c...
1994-06-15
2010-11-01
[ "hep-ph" ]
C.Q. Geng, I.J. Hsu and Y.C. Lin
hep-ph/9406316
$\epsilon_b$ Constraints on Self--Couplings of Vector Bosons
We analyze the constraints on possible anomalous contributions to the $W^+W^-Z$ vertex coming from non-universal radiative corrections to the $Z \rightarrow b \bar{b}$ width. We parametrize these corrections in terms of $\epsilon_b$ and use the LEP data to establish the allowed values for the anomalous triple couplings...
1994-06-15
2009-10-28
[ "hep-ph" ]
O.J.P. Eboli, S.M. Lietti, M.C. Gonzalez-Garcia and S.F. Novaes
hep-ph/9406312
A Variational Approach to the Spinless Relativistic Coulomb Problem
By application of a straightforward variational procedure we derive a simple, analytic upper bound on the ground-state energy eigenvalue of a semirelativistic Hamiltonian for (one or two) spinless particles which experience some Coulomb-type interaction.
1994-06-15
2009-10-28
[ "hep-ph", "hep-th" ]
Wolfgang Lucha and Franz F. SCH\"Oberl
hep-ph/9406311
An Effective Chiral Lagrangian Approach to Kaon-Nuclear Interactions: Kaonic atom and kaon condensation
On-shell kaon-nucleon scattering, kaonic atom and kaon condensation are treated on the same footing by means of a chiral perturbation expansion to the next-to-next-to-leading order (``N$^2$LO"). Constraining the low-energy constants in the chiral Lagrangian by on-shell $KN$ scattering lengths and kaonic atom data, the ...
1994-06-15
2009-10-28
[ "hep-ph", "nucl-th" ]
Chang-Hwan Lee, G. E. Brown, Dong-Pil Min and Mannque Rho
hep-ph/9406339
$B_c$ spectroscopy
In the framework of potential models for heavy quarkonium the mass spectrum for the system ($\bar b c$) is considered. Spin-dependent splittings, taking into account a change of a constant for effective Coulomb interaction between the quarks, and widths of radiative transitions between the ($\bar b c$) levels are calcu...
1994-06-15
2009-10-28
[ "hep-ph" ]
V.V.Kiselev, A.K.Likhoded, A.V.Tkabladze
hep-ph/9406320
$D^*$ Radiative Decays and Strong Coupling of Heavy Mesons with Soft Pions in a QCD Relativistic Potential Model
In the framework of a QCD inspired relativistic potential model, we evaluate radiative decay rates of heavy mesons and their coupling with soft pions. The agreement with the existing experimental data is satisfactory. In the limit $m_Q \to \infty$ one obtains results in agreement with the Heavy Quark Effective Theory a...
1994-06-15
2009-10-28
[ "hep-ph" ]
P. Colangelo, F. De Fazio and G. Nardulli
hep-ph/9406322
Electroweak Sphaleron For Effective Theory In The Limit Of Large Higgs Boson Mass
Theoretical arguments suggest that the Higgs sector of the standard model is an effective theory. We parametrize the new physics by means of an effective Lagrangian technique and study its effect on the energy of the electroweak sphaleron. We found that in the presence of a certain class of higher dimension operators t...
1994-06-15
2009-10-28
[ "hep-ph" ]
Xinmin Zhang, B.-L. Young and S.K. Lee
hep-ph/9406319
Large Scale Structure and Supersymmetric Inflation without Fine Tuning
We explore constraints on the spectral index $n$ of density fluctuations and the neutrino energy density fraction $\Omega_{HDM}$, employing data from a variety of large scale observations. The best fits occur for $n\approx 1$ and $\Omega_{HDM} \approx 0.15 - 0.30$, over a range of Hubble constants $40-60$ km s$^{-1}$ M...
1994-06-15
2011-05-12
[ "hep-ph", "astro-ph" ]
G. Dvali, Q. Shafi, and R. Schaefer
hep-ph/9406315
Parton Distributions of the Proton
To obtain improved parton densities of the proton, we present a new global analysis of deep inelastic and related data including, in particular, the recent measurements of $F_2$ at HERA, of the asymmetry of the rapidity distributions of $W^\pm$ production at the FNAL $pp$ collider and of the asymmetry in Drell-Yan prod...
1994-06-15
2014-11-17
[ "hep-ph" ]
A.D. Martin, R.G. Roberts and W.J. Stirling
hep-ph/9406309
The Detection of Cold Dark Matter with Neutrino Telescopes
High energy neutrinos are produced by the annihilation of dark matter particles in our galaxy. These are presently searched for with large area, deep underground neutrino telescopes. Cold dark matter particles, trapped inside the sun, are an abundant source of such neutrinos. Back-of-the-envelope calculations are suffi...
1994-06-14
2009-09-25
[ "hep-ph" ]
F.Halzen and J.E.Jacobsen
hep-ph/9406304
Tau Leptons and Top Quarks in a `Non-Local' Baryogenesis at the Electroweak Phase Transition
Baryon asymmetry can be generated at the first order electroweak phase transition, provided there is a CP violation on the bubble wall. In this report we discuss the role of leptons and quarks in the `non-local' baryogenesis mechanism.
1994-06-14
2007-05-23
[ "hep-ph" ]
Tomislav Prokopec
hep-ph/9406306
A Model for the Origin and Mechanisms of CP Violation
In this talk I will show that the two-Higgs doublet model with vacuum CP violation and approximate global $U(1)$ family symmetries may provide one of the simplest and most attractive models for understanding the origin and mechanisms of CP violation. It is shown that the mechanism of spontaneous symmetry breaking provi...
1994-06-14
2009-10-28
[ "hep-ph" ]
Yue-Liang Wu
hep-ph/9406307
On the problem of the magnetic mass
The dynamical generation of a transverse gauge field mass is studied by means of gap equations for pure gauge theory and the gauged non-linear sigma model in three dimensions. Non-trivial solutions to the gap equations are found indicating that this type of mass generation is a feature of the static sector of finite te...
1994-06-14
2007-05-23
[ "hep-ph" ]
O.Philipsen
hep-ph/9406310
Generational Mass Splitting of Neutrinos in High Temperature $SU(2)_{\scriptscriptstyle{L}}\otimes U(1)$ Gauge Theory
We calculate the generational mass splitting of neutrinos in high temperature $SU(2)_{\scriptscriptstyle{L}}\otimes U(1)$ gauge theory when the temperature is above $250$ GeV and the gauge symmetry is restored. We consider the case of neutrinos that are massless at tree level as well as the case of neutrinos with tree-...
1994-06-14
2009-10-28
[ "hep-ph" ]
A. Erdas, C. W. Kim and J. A. Lee
hep-ph/9406302
Top Ten Models Constrained by b to s gamma
The radiative decay b to s gamma is examined in the Standard Model and in nine classes of models which contain physics beyond the Standard Model. The constraints which may be placed on these models from the recent results of the CLEO Collaboration on both inclusive and exclusive radiative $B$ decays is summarized. Reas...
1994-06-14
2009-09-25
[ "hep-ph" ]
J.L. Hewett
hep-ph/9406303
Unification Constraints in the Next-to-Minimal Supersymmetric Standard Model
We perform a renormalisation group analysis of the next-to-minimal supersymmetric standard model (NMSSM) based on the following constraints: two-loop gauge coupling unification at a variable scale $M_X$, running the gauge couplings through the low energy thresholds; universal soft supersymmetry breaking parameters; cor...
1994-06-14
2009-10-28
[ "hep-ph" ]
T. Elliott, S. F. King and P. L. White
hep-ph/9406308
Axion Dissipation Through the Mixing of Goldstone Bosons
By coupling axions strongly to a hidden sector, the energy density in coherent axions may be converted to radiative degrees of freedom, alleviating the ``axion energy crisis''. The strong coupling is achieved by mixing the axion and some other Goldstone boson through their kinetic energy terms, in a manner reminiscent ...
1994-06-14
2011-05-12
[ "hep-ph", "astro-ph" ]
K.S. Babu, S.M. Barr and D. Seckel
hep-ph/9406305
A Novel Kind of Neutrino Oscillation Experiment
A novel method to look for neutrino oscillations is proposed based on the elastic scattering process $\bar{\nu}_{i} e^{-}\rightarrow \bar{\nu}_{i} e^{-}$, taking advantage of the dynamical zero present in the differential cross section for $\bar{\nu}_{e} e^{-}\rightarrow \bar{\nu}_{e} e^{-}$. An effective tunable exper...
1994-06-14
2016-08-14
[ "hep-ph" ]
J. Segura, J. Bernab\'eu, F.J. Botella and J.A. Pe\~narrocha
hep-ph/9406294
Minimal Supersymmetric Higgs Boson Decay Rate in O(\alpha_s^2) Perturbative QCD
A short presentation of the results of the analytical evaluation of the O(\alpha_s^2) QCD contributions in the fermionic decay rates of the neutral CP-odd minimal supersymmetric Higgs particle is made. The corrections due to the nonvanishing quark masses are included. The results are presented both in terms of running ...
1994-06-13
2009-10-28
[ "hep-ph" ]
Levan R. Surguladze
hep-ph/9406301
Electroweak Baryogenesis and the Standard Model
Electroweak baryogenesis is addressed within the context of the standard model of particle physics. Although the minimal standard model has the means of fulfilling the three Sakharov's conditions, it falls short to explaining the making of the baryon asymmetry of the universe. In particular, it is demonstrated that the...
1994-06-13
2008-02-03
[ "hep-ph" ]
Patrick Huet
hep-ph/9406300
Strong and Radiative $D^\ast$ Decays
We use the relativistic light--front quark model to show that both strong and radiative $D^\ast$ decays are in good agreement with the 1992 CLEO II results. In particular the coupling for $D^{\ast}\ra D \pi$ is consistent with the experimental upper limit. The key point is the relativistic treatment of the quark spin.
1994-06-13
2011-07-19
[ "hep-ph" ]
Patrick J. O'Donnell and Q. P. Xu
hep-ph/9406297
Fluctuations at Phase Transitions
We use the closed time-path formalism to calculate fluctuations at phase transitions, both in and out of equilibrium. Specifically, we consider the creation of vortices by fluctuations, of relevance to the early universe and to $^{4}He$ superfluidity. (Invited talk to Nato Advanced Research Workshop on Electroweak Phys...
1994-06-13
2007-05-23
[ "hep-ph" ]
R.J. Rivers
hep-ph/9406296
Symmetry Principles toward Solutions of $\mu$ Problem
We stress that a natural solution of the $\mu$ problem requires two ingredients: a symmetry that would enforce $\mu = 0$ as well as the occurence of a small breaking parameter that generates a nonzero $\mu$. It is suggested that both the Peccei-Quinn symmetry and the spontaneously broken $R$ symmetry may be the sources...
1994-06-13
2008-11-26
[ "hep-ph", "hep-th" ]
Jihn E. Kim and Hans Peter Nilles
hep-ph/9406295
On the coupling of heavy mesons to pions in QCD
We compute the strong coupling constant $g_{P^* P \pi}$, with $P$ and $P^*$ respectively pseudoscalar and vector heavy mesons by using the QCD sum rules approach. Our computation is based on the evaluation of the time ordered product of currents between the vacuum and the soft pion state. The so-called parasitic terms ...
1994-06-13
2009-10-28
[ "hep-ph" ]
P. Colangelo, A. Deandrea, N. Di Bartolomeo, F. Feruglio, R. Gatto and G. Nardulli
hep-ph/9406298
Parameterization Invariance and the Resolution of the Unitary Gauge Puzzle
We examine the calculation of the critical temperature $T_c$ for the restoration of a spontaneously broken symmetry. Motivated by a set of recently developed gauge dependence identities, we give a gauge and parameterization independent definition of this temperature in terms of the physical mass of the scalar particle ...
1994-06-13
2009-10-28
[ "hep-ph", "hep-th" ]
P.F. Kelly, R. Kobes, and G. Kunstatter
hep-ph/9406299
Quartic Mass Corrections to $R_{had}$
The influence of nonvanishing quark masses on the total cross section in electron positron collisions and on the $Z$ decay rate is calculated. The corrections are expanded in $m^2/s$ and $\as$. Methods similar to those applied for the quadratic mass terms allow to derive the corrections of order $\as m^4/s^2$ and $\as^...
1994-06-13
2011-01-25
[ "hep-ph" ]
K.G.Chetyrkin and J.H. K\"uhn
hep-ph/9406292
On the Unitarity Triangles of the CKM Matrix
The unitarity triangles of the $3\times 3$ Cabibbo-Kobayashi-Maskawa (CKM) matrix are studied in a systematic way. We show that the phases of the nine CKM rephasing invariants are indeed the outer angles of the six unitarity triangles and measurable in the $CP$-violating decay modes of $B_{d}$ and $B_{s}$ mesons. An ec...
1994-06-12
2010-11-01
[ "hep-ph" ]
Dan-di WU and Zhi-zhong XING
hep-ph/9406290
Triviality, perturbation theory and $Z\to b \overline b$
We compute the large-$m_t$ contributions to the $Zb\overline b$ vertex in the Standard Model non-perturbatively using both the $1/\nc$ and the $1/\nf$ expansions. Triviality and its consequences for the perturbative result are systematically analyzed. In particular, we point out that the effect of triviality is already...
1994-06-12
2009-10-28
[ "hep-ph", "hep-lat" ]
Kenichiro Aoki and Santiago Peris
hep-ph/9406293
On Test of CPT Symmetry in CP Violating B Decays
Considering that the existing experimental limit for $CPT$ violation is still poor, we explore various possible ways to test $CPT$ symmetry in $CP$-violating $B$ decays at $e^{+}e^{-}$ $B$ factories and hadron machines. We find that it is difficult to distinguish between the effect of direct $CP$ violation and that of ...
1994-06-12
2009-12-30
[ "hep-ph" ]
Zhi-zhong Xing
hep-ph/9406287
On The Spin-Dependent Potential Between Heavy Quark And Antiquark
A new formula for the heavy quark-antiquark spin dependent potential is given by using the techniques developed in the heavy quark effective theory. The leading logarithmic quark mass terms emerging from the loop contributions are explicitly extracted and summed up. There is no renormalization scale ambiguity in this n...
1994-06-11
2008-11-26
[ "hep-ph" ]
Yu-Qi Chen, Yu-Ping Kuang and Robert J. Oakes
hep-ph/9406286
On the QCD corrections to $b \to s \gamma$ in supersymmetric models
We reinvestigate the leading QCD corrections to the radiative decay $b \to s \gamma for supersymmetric extensions of the Standard Model. Although the major contributions to the corrections originate from the running of the effective Lagrangian from the W scale down to the $b$ scale, additional corrections are expected ...
1994-06-11
2009-10-28
[ "hep-ph" ]
H. Anlauf
hep-ph/9406288
Standard Model CP-violation and Baryon asymmetry Part I: Zero Temperature
We consider quantum effects in a world with two coexisting symmetry phases, unbroken and spontaneously broken, as a result of a first order phase transition. The discrete symmetries of the problem are discussed in general. We compute the exact two-point Green function for a free fermion, when a thin wall separates the ...
1994-06-11
2010-11-01
[ "hep-ph", "astro-ph" ]
M.B. Gavela, M. Lozano, J. Orloff, O.P\`ene
hep-ph/9406291
On Measuring $CP$ Violation in Neutral $B$-meson Decays at the $\Upsilon (4S)$ Resonance
Within the standard model we carry out an analysis of $CP$-violating observables in neutral $B$-meson decays at the $\Upsilon (4S)$ resonance. Both time-dependent and time-integrated $CP$ asymmetries are calculated, without special approximations, to meet various possible measurements at symmetric and asymmetric $e^{+}...
1994-06-11
2010-11-01
[ "hep-ph" ]
H. Fritzsch, D. Wu, and Z. Xing
hep-ph/9406289
Standard Model CP-violation and Baryon asymmetry Part II: Finite Temperature
We consider the scattering of quasi-particles off the boundary created during a first order electroweak phase transition. Spatial coherence is lost due to the quasi-quark damping rate, and we show that reflection on the boundary is suppressed, even at tree-level. Simply on CP considerations, we argue against electrowea...
1994-06-11
2010-11-01
[ "hep-ph", "astro-ph" ]
M.B. Gavela, P. Hernandez, J. Orloff, O.P\`ene, C. Quimbay
hep-ph/9406283
Principles of Chiral Perturbation Theory
Lectures given at the Workshop "Hadrons 1994", Gramado, RS, Brasil
1994-06-10
2014-02-17
[ "hep-ph" ]
H. Leutwyler
hep-ph/9406274
One-Particle Inclusive Processes in Deeply Inelastic Lepton-Nucleon Scattering
The one-particle inclusive cross section in deeply inelastic lepton--nucleon scattering, expressed in terms of parton densities and fragmentation functions being differential in the invariant mass of the observed hadron and of the incoming nucleon, diverges if this invariant mass vanishes. This divergence can be traced...
1994-06-10
2009-10-28
[ "hep-ph" ]
Dirk Graudenz
hep-ph/9406271
The Background Field Method: Alternative Way of Deriving the Pinch Technique's Results
We show that the background field method (BFM) is a simple way of deriving the same gauge-invariant results which are obtained by the pinch technique (PT). For illustration we construct gauge-invariant self-energy and three-point vertices for gluons at one-loop level by BFM and demonstrate that we get the same results ...
1994-06-10
2009-10-28
[ "hep-ph" ]
Shoji Hashimoto, Jiro Kodaira, Yoshiaki Yasui and Ken Sasaki
hep-ph/9406273
Semi-Analytical Approach to Higgs Production at LEP 2
The cross-section for the reaction $e^+e^- \rightarrow b\bar{b}\mu^+\mu^-$ is calculated with a semi-analytical integration of the phase space. Compact formulae are obtained for the total cross section and for invariant mass distributions of the $\mu^+\mu^-$ and $b\bar{b}$ pairs. The background diagrams to $ZH$ product...
1994-06-10
2011-01-25
[ "hep-ph" ]
D. Bardin, A. Leike, T. Riemann
hep-ph/9406279
Instanton Contribution to $B \rightarrow X_{s} \gamma $ Decay
We study instanton effects on $B \rightarrow X_s\gamma$ decay using the heavy quark effective field theory and the operator product expansion. In the dilute gas approximation the effect is negligibly small. This is in contrast to the result of the instanton effect in inclusive semileptonic $b\rightarrow u$ decay but si...
1994-06-10
2009-10-28
[ "hep-ph" ]
Junegone CHAY and Soo-Jong REY
hep-ph/9406278
Issues in Light Meson Spectroscopy: The Case for Meson Spectroscopy at Cebaf
I review some outstanding issues in meson spectroscopy. The most important qualitative issue is whether hadrons with explicit gluonic degrees of freedom exist. To answer this question requires a much better understanding of conventional $q\bar{q}$ mesons. I therefore begin by examining the status of conventional meson ...
1994-06-10
2009-09-25
[ "hep-ph", "nucl-th" ]
Stephen Godfrey
hep-ph/9406281
The Higgs Boson Width is Adjustable
We show that it is possible to construct models in which the width of the Higgs boson is arbitrary - either smaller or larger than a standard model Higgs boson of the same mass. There are no new fields into which the Higgs boson decays. Instead, the coupling of the Higgs boson to the gauge bosons is adjusted. We constr...
1994-06-10
2009-10-28
[ "hep-ph" ]
R. Sekhar Chivukula, Michael J. Dugan, and Mitchell Golden
hep-ph/9406272
CP Violation: Present and Future
We review the present status of CP violation in the standard model. Subsequently we make an excursion in the future in order to see what we could expect in this field in this and the next decade. We present various strategies for the determination of the CKM parameters and divide the decays into four classes with respe...
1994-06-10
2009-09-25
[ "hep-ph" ]
A.J. Buras