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hep-ph/9303212
B=1 Soliton of the Nambu - Jona-Lasinio model in medium}
The solitonic sector of the Nambu - Jona-Lasinio model with baryon number one is solved in the presence of an external medium. The calculations fully include the polarization of both the Dirac sea and the medium as well as the Pauli blocking effect. We found that with an increasing density the medium destabilizes the s...
1993-03-03
2009-10-22
[ "hep-ph" ]
Chr.V.Christov and K.Goeke
hep-ph/9303213
Nucleon Properties and Restoration of Chiral Symmetry at Finite\nl Density and Temperature in an Effective Theory
Modifications of baryon properties due to the restoration of the chiral symmetry in an external hot and dense baryon medium are investigated in an effective chiral quark-meson theory. The nucleon arises as a soliton of the Gell-Mann - L\'evi $\zs$-model, the parameters of which are chosen to be the medium-modified meso...
1993-03-03
2009-10-22
[ "hep-ph" ]
Chr.V.Christov, E. Ruiz Arriola and K.Goeke
hep-ph/9303209
A Mass Spectrum for Leptons and Quarks
A suggestive phenomenological relation is found among the lepton and quark masses which suggests a new insight into the problem of generations and also gives a prediction for the top quark mass in agreement with the range of values which is actually expected.
1993-03-03
2015-06-25
[ "hep-ph" ]
G.Mangano and F. Sannino
hep-ph/9303216
Gluon Fusion: A Probe of Higgs Sector CP Violation
We demonstrate that CP violation in the Higgs sector, \eg\ of a multi-doublet model, can be directly probed using gluon-gluon collisions at the SSC. % requires phyzzx.tex macro package
1993-03-03
2010-11-01
[ "hep-ph" ]
John F. Gunion, T.C. Yuan, and B. Grzadkowski
hep-ph/9303217
Towards a theory of quark and lepton masses
Has any progress been made on understanding and predicting the 13 parameters which describe the observed masses and mixing angles of the quarks and leptons? Arguments are given in favor of pursuing schemes in which grand unified and family symmetries provide many relations among these 13 parameters. A sequence of simpl...
1993-03-03
2009-10-22
[ "hep-ph" ]
Lawrence J. Hall
hep-ph/9303207
Heavy Quark Solitons
We investigate the heavy baryons which arise as solitonic excitations in a ``heavy meson" chiral Lagrangian which includes the light vector particles. It is found that the effect of the light vectors may be substantial. We also present a simple derivation which clearly shows the connection to the Callan-Klebanov approa...
1993-03-03
2009-10-22
[ "hep-ph" ]
Kumar S. Gupta, M. Arshad Momen, J. Schechter and A. Subbaraman
hep-ph/9303214
$O(\alpha_S)$ Corrections to the Photon Structure Functions $F^\gamma_2(x,Q^2)$ and $F_L^\gamma(x,Q^2)$
We examine the QCD corrections to the structure functions $F_2^\gamma(x,Q^2)$ and $F_L^\gamma(x,Q^2)$ for a real photon target. The pointlike photon contributions from light and heavy quarks are computed through $O(\alpha\alpha_S)$. A parameterization of the hadronic (resolved) photon contribution is also included and ...
1993-03-03
2008-02-03
[ "hep-ph" ]
E.Laenen, S.Riemersma, J.Smith, W.L. van Neerven
hep-ph/9303208
Complete angular analysis of the decay cascade $B \rightarrow D^{**}( \rightarrow D^*(\rightarrow D \pi) + \pi) + W(\rightarrow l \nu)$
We develop a general algorithm for describing angular decay distributions in cascade decay chains of arbitrary length. The general algorithm is used to study joint angular decay distributions for the cascade decay $B\rightarrow D^{**}( \rightarrow D^*(\rightarrow D \pi)+\pi) + W(\rightarrow l\nu)$ where the $D^{**}$ is...
1993-03-03
2015-06-25
[ "hep-ph" ]
P. Bialas, J.G. Koerner, K. Zalewski
hep-ph/9303215
Numerical analysis of the Higgs mass triviality bound
Previous large $N$ calculations are combined with numerical work at $N=4$ to show that the Minimal Standard Model will describe physics to an accuracy of a few percent up to energies of the order 2 to 4 times the Higgs mass, $M_H$, only if $M_H \le 710\pm60 ~ GeV$. This bound is the result of a systematic search in the...
1993-03-03
2009-10-22
[ "hep-ph", "astro-ph", "hep-lat" ]
U M. Heller, M. Klomfass, H. Neuberger, and P. Vranas
hep-ph/9303210
Nonleptonic Cabibbo Favoured $B$-Decays and $CP$-Asymmetries for Charmed Final Hadron States in Isgur and Wise Theory
The Cabibbo allowed non-leptonic $B$-decays in two hadrons are studied, within the factorization hypothesis, in the framework of Isgur and Wise theory for the matrix elements of the $\Delta B=-\Delta C=\pm 1$ weak currents. The $SU(2)_{HF}$ symmetry relates $|\Delta B|=1$ to $|\Delta C|=1$ currents, which have been mea...
1993-03-03
2010-11-01
[ "hep-ph" ]
F. Buccella, F. Lombardi, G. Miele and P. Santorelli
hep-ph/9303206
Could a nearby supernova explosion have caused a mass extinction?
We examine the possibility that a nearby supernova explosion could have caused one or more of the mass extinctions identified by palaeontologists. We discuss the likely rate of such events in the light of the recent identification of Geminga as a supernova remnant less than 100 pc away and the discovery of a millisecon...
1993-03-02
2019-08-17
[ "hep-ph" ]
John Ellis, David N. Schramm
hep-ph/9303205
Gluon Fragmentation into Heavy Quarkonium
The dominant production mechanism for heavy quark-antiquark bound states in very high energy processes is fragmentation, the splitting of a high energy parton into a quarkonium state and other partons. We show that the fragmentation functions $D(z,\mu)$ describing these processes can be calculated using perturbative QC...
1993-03-02
2014-11-17
[ "hep-ph" ]
Eric Braaten and Tzu Chiang Yuan
hep-ph/9303204
CP Violation in $t \bar{t}$ Production at $e^+ e^-$ Colliders
The general production {\it and} decay mechanism of $\ttbar$ in future high-energy $\epem$ colliders has been investigated in a model-independent way, focusing on an observation of possible CP violation. Angular asymmetries sensitive to CP violation either in the production {\it or} in the subsequent decays have been f...
1993-03-02
2010-11-01
[ "hep-ph" ]
Bohdan Grz\c{a}dkowski
hep-ph/9303203
CP Test in the W Pair Production via Photon Fusion at NLC
We study the possibility to test CP invariance in the $W^+W^-$ production via photon fusion at NLC. The predictions of the CP violation effects are made within two Higgs doublet extensions of the minimal standard model, where CP violation is introduced by a neutral Higgs exchange in s channel in our case. The width eff...
1993-03-02
2010-11-01
[ "hep-ph" ]
J.P. Ma and B.H.J. McKellar
hep-ph/9303202
On the Unification of Couplings in the Minimal Supersymmetric Standard Model
The unification of gauge and Yukawa couplings within the minimal supersymmetric standard model is studied at the two loop level. We derive an expression for the effective scale, $T_{SUSY}$, which characterizes the supersymmetric particle threshold corrections to the gauge couplings, and demonstrate that $T_{SUSY}$ is o...
1993-03-01
2008-11-26
[ "hep-ph" ]
M. Carena, S. Pokorski and C.E.M. Wagner
hep-ph/9303201
Vector Resonances from a Strong Electroweak Sector at Linear Colliders
We explore the usefulness of very energetic linear $e^+e^-$ colliders in the $TeV$ range in studying an alternative scheme of electroweak symmetry breaking based on a strong interacting sector. The calculations are performed within the BESS model which contains new vector resonances. If the mass $M_V$ of the new boson ...
1993-03-01
2009-10-22
[ "hep-ph" ]
R.Casalbuoni, P. Chiappetta, A. Deandrea, S. De Curtis, D. Dominici and R. Gatto
hep-ph/9302320
Tensor Structure Function b$_1$(x) For Spin-One Hadrons
High-energy spin physics became a popular topic recently after the EMC finding for the proton's spin content. There exist unmeasured spin-dependent structure functions ($b_1$, $b_2$, $b_3$, and $b_4$) for spin-one hadrons such as the deuteron. The tensor structure function $b_1(x)$ could be measured by the proposed 15 ...
1993-02-28
2007-05-23
[ "hep-ph", "nucl-th" ]
S. Kumano (Univ. of Mainz)
hep-ph/9302321
General Solutions for Tunneling of Scalar Fields with Quartic Potentials
For the theory of a single scalar field $\varphi$ with a quartic potential $V(\varphi)$, we find semi-analytic expressions for the Euclidean action in both four and three dimensions. The action in four dimensions determines the quantum tunneling rate at zero temperature from a false vacuum state to the true vacuum stat...
1993-02-28
2009-10-22
[ "hep-ph" ]
Fred C. Adams
hep-ph/9302319
Single $W$ Boson Production in High Energy $e\gamma$ Collisions
We studied single $W$ boson production in high energy $e\gamma$ collisions and the sensitivity of various observables to the $WW\gamma$ gauge boson coupling. We evaluated the helicity amplitudes including the $W$ decay to final state fermions and all Feynman diagrams which give the same final state. At high energy, the...
1993-02-27
2007-05-23
[ "hep-ph" ]
Stephen Godfrey and K. Andrew Peterson (Ottawa-Carleton Institute for Physics)
hep-ph/9302314
Sphalerons at finite temperature
We construct the sphaleron for several temperature dependent effective potentials. We determine the sphaleron energy as a function of temperature and demonstrate that the sphaleron energy at a given temperature $T$ is well approximated by the sphaleron energy at temperature zero scaled by the ratio of the vacuum expect...
1993-02-26
2015-06-25
[ "hep-ph" ]
Sylvie Braibant, Yves Brihaye and Jutta Kunz
hep-ph/9302316
Reconciling Dark Matter, Solar and Atmospheric Neutrinos
We present models that can reconcile the solar and atmospheric neutrino data with the existence of a hot dark matter component in the universe. This dark matter is a quasi-Dirac neutrino whose mass $m_{DM}$ arises at the one-loop level. The solar neutrino deficit is explained via nonadiabatic conversions of electron ne...
1993-02-26
2016-09-01
[ "hep-ph" ]
J. T. Peltoniemi and J. W. F. Valle
hep-ph/9302312
Non-oblique Correction in Extenden Technicolor Theory
We study radiative corrections on $Zb{\bar b}$ vertex generated by the ETC gauge bosons, ``diagonal'' as well as sideways. Although the oblique corrections due to the ETC bosons are small in comparison with the oblique correction due to the technicolor dynamics, the non-oblique corrections result in substantial shift o...
1993-02-26
2009-10-22
[ "hep-ph" ]
N. Kitazawa
hep-ph/9302317
Cosmological Constraints and SU(5) Supergravity Grand Unification
The predictions of SU(5) supergravity models with radiative breaking constrained by experimental proton decay bounds are discussed. It is shown that cosmological constraints further restrict the parameter space but can be satisfied for a wide range of parameters. It is also shown that no serious fine tuning problems (e...
1993-02-26
2008-11-26
[ "hep-ph" ]
R. Arnowitt and Pran Nath
hep-ph/9302318
Predictions in SU(5) Supergravity Grand Unification with Proton Stability and Relic Density Constraints
It is shown that in the physically interesting domain of the parameter space of SU(5) supergravity GUT, the Higgs and the Z poles dominate the LSP annihilation. Here the naive analyses on thermal averaging breaks down and formulae are derived which give a rigorous treatment over the poles. These results are then used t...
1993-02-26
2008-11-26
[ "hep-ph" ]
P. Nath and R. Arnowitt
hep-ph/9302313
Fermions in the background of the sphaleron barrier
We demonstrate the level crossing phenomenon for fermions in the background field of the sphaleron barrier, by numerically determining the fermion eigenvalues along the minimal energy path from one vacuum to another. We assume that the fermions of a doublet are degenerate in mass, allowing for spherically symmetric ans...
1993-02-26
2009-10-22
[ "hep-ph" ]
Jutta Kunz and Yves Brihaye
hep-ph/9302315
T Violation Induced by Supersymmetry in t\bar{t} and W^+W^- Physics
T-odd correlations of polarizations and momenta provide a promising testing ground for new physics beyond the standard model. We estimate the contribution of the minimal supersymmetric extension of the standard model to two such observables: in the production of $t\bar{t}$, we look for a term proportional to \mbox{${\b...
1993-02-26
2010-11-01
[ "hep-ph" ]
E. Christova and M. Fabbrichesi
hep-ph/9302310
Dimensionality of spacetime as a gauge-invariance parameter in Yang-Mills calculations
This is the revised version of an earlier paper with the same title.
1993-02-25
2009-10-22
[ "hep-ph" ]
Rajesh R. Parwani
hep-ph/9302309
$K_L \ra \mu^\pm e^\mp \nu \overline{\nu}$ as background to $K_L \ra \mu^\pm e^\mp$
We consider the process $K_L \ra \mu^\pm e^\mp \nu \overline{\nu}$ at next to leading order in chiral perturbation theory. This process occurs in the standard model at second order in the weak interaction and constitutes a potential background in searches for new physics through the modes $K_L \ra \mu^\pm e^\mp$. We fi...
1993-02-25
2009-10-22
[ "hep-ph" ]
S. Dawson and G. Valencia
hep-ph/9302311
Top Near Threshold: All QCD Radiative Corrections are Trivial
We have calculated part of O(${\alpha}_{S}$) QCD radiative correction to the total cross-section of top's threshold production in $ e^{+}e^{-} \to t\bar t \to W^{-} b W^{+} \bar b$ reaction. We found out a curious fact: there is no O(${\alpha}_{S}$) correction to the total cross-section, originated from $b \bar b , t \...
1993-02-25
2016-09-01
[ "hep-ph" ]
K.Melnikov and O.Yakovlev
hep-ph/9302304
The $\pi^0\to e^+e^-$ and $\eta\to \mu^+ \mu^-$ Decays Revisited
The rare $\pi^0 \to e^+e^-$ and $\eta \to \mu^+\mu^-$ decays are calculated in different schemes, which are seen to be essentially equivalent to and produce the same results as conventional Vector-Meson Dominance. We obtain the theoretical predictions $B(\pi^0 \to e^+e^-) = (6.41 \pm 0.19)\times 10^{-8}$ and $B(\eta \t...
1993-02-24
2009-10-22
[ "hep-ph" ]
Ll. Ametller, A. Bramon and E. Mass\'o
hep-ph/9302296
Unified Description of Hadrons and Heavy Hadron Decays
We construct an effective Lagrangian which describes interactions of heavy and light hadrons utilizing the chiral flavor symmetry for light quarks and heavy quark symmetry. For both light and heavy sector we include pseudo scalars, vectors and baryons in the Lagrangian. Heavy hadron decays are discussed as application ...
1993-02-24
2007-05-23
[ "hep-ph" ]
N.Kitazawa and T.Kurimoto
hep-ph/9302305
Next-to-Leading Order QCD Formulation of Deep Inelastic Scattering
We have performed a QCD next-to-leading order (NLO) calculation for Deep Inelastic Scattering (DIS) retaining the full parton and hadron mass dependencies. We find that the gluon initiated contributions to DIS processes, such as charm production, are {\it comparable} in magnitude ({\it i.e.}, $30\%$ to $100\%$) to the ...
1993-02-24
2007-05-23
[ "hep-ph" ]
M. A. G. Aivazis, Wu-Ki Tung, Fredrick Olness
hep-ph/9302302
Supersymmetric Signals in $\gamma\gamma$ Collisions
We study the occurrence of final states with only an electron-positron pair and missing transverse momentum as a signal of \susy\ in photon-photon collisions. Suitable high energy photon beams may be provided at linear colliders by back-scattering laser beams on electron beams. The final states considered represent a t...
1993-02-24
2009-10-22
[ "hep-ph" ]
Frank Cuypers, Geert Jan van Oldenborgh and Reinhold R\"uckl
hep-ph/9302306
QCD Tests in Proton-Antiproton Collisions
We review the status of QCD tests in high energy p-pbar collisions. Contents: i) Introduction ii) QCD in Hadronic Collisions iii) Jet Production iv) Heavy Flavour Production v) W and Z Production vi) Direct Photons.
1993-02-24
2011-01-25
[ "hep-ph" ]
John HUTH and Michelangelo MANGANO
hep-ph/9302301
Masses, Mixings, Yukawa Couplings and their Symmetries
We present a method to find the number of real and imaginary observable parameters coming from the Yukawa sector in an arbitrary gauge theory. The method leads naturally to a classification of Yukawa couplings according to their symmetries and suggests a new parametrization of masses and mixings that is useful to study...
1993-02-24
2009-10-22
[ "hep-ph" ]
Arcadi Santamaria
hep-ph/9302299
Estimates of $m_d - m_u$ and $\langle\bar{d}d\rangle - \langle\bar{u}u\rangle$ from QCD sum rules for $D$ and $D^{\ast}$ isospin mass differences
The recent experimental data on $D^{+}-D^{0}$ and $D^{\ast\, +}-D^{\ast\,0}$ mass differences are used as inputs in the QCD sum rules to obtain new estimates on the mass difference of light quarks and on the difference of their condensates: $m_d -m_u =3\pm 1\, MeV$, $\langle\bar{d}d\rangle -\langle\bar{u}u\rangle = -(2...
1993-02-24
2011-02-01
[ "hep-ph" ]
V.L. Eletsky and B.L. Ioffe
hep-ph/9302298
On the current correlators in QCD at finite temperature
Current correlators in QCD at a finite temperature $T$ are considered from the viewpoint of operator product expansion. It is stressed that at low $T$ the heat bath must be represented by hadronic, and not quark-gluon states. A possibility to express the results in terms of $T$-dependent resonance masses is discussed. ...
1993-02-24
2010-11-01
[ "hep-ph", "nucl-th" ]
V.L.Eletsky and B.L. Ioffe
hep-ph/9302300
Temperature Dependence of Electric and Magnetic Gluon Condensates
The contribution of Lorentz non-scalar operators to finite temperature correlation functions is discussed. Using the local duality approach for the one-pion matrix element of a product of two vector currents, the temperature dependence of the average gluonic stress tensor is estimated in the chiral limit to be $\langle...
1993-02-24
2010-11-01
[ "hep-ph", "nucl-th" ]
V. Eletsky, P. Ellis and J. Kapusta
hep-ph/9302297
Constraints on Anomalous $WW\gamma$ Couplings From $e\gamma$\ Collisions
We study the potential for using $e\gamma$\ collisions produced by backscattered laser photons to investigate WW$\gamma$\ couplings. We present results for Next Linear Collider energies of 500 GeV and 1 TeV. We find that where statistics allow, off W mass shell results can be quite important, complementing on W mass sh...
1993-02-24
2008-02-03
[ "hep-ph" ]
K.A. Peterson and Stephen Godfrey
hep-ph/9302303
Testing Supersymmetry by Means of Time Reversal Invariance
The minimal supersymmetric extension of the standard model allows for some of the coupling strengths to be complex parameters. The presence of such imaginary phases can lead to violations of time reversal invariance, which can be tested if correlations in products of an odd number of polarizations and momenta are measu...
1993-02-24
2009-10-22
[ "hep-ph" ]
E. Christova and M. Fabbrichesi
hep-ph/9302308
Heterotic Pomeron: A Unified Treatment of High Energy Hadronic Collisions in QCD
A unified treatment of high energy collisions in QCD is presented. Using a probabilistic approach, we incorporate both perturbative (hard) and non-perturbative (soft) components in a consistent fashion, leading to a ``Heterotic Pomeron". As a Regge trajectory, it is nonlinear, approaching 1 in the limit $t\rightarrow -...
1993-02-24
2007-05-23
[ "hep-ph", "hep-th" ]
Genya Levin and Chung-I Tan
hep-ph/9302307
Z^0 Decay into Charmonium via Charm Quark Fragmentation
In decays of the $Z^0$, the dominant mechanism for the direct production of charmonium states is the decay of the $Z^0$ into a charm quark or antiquark followed by its fragmentation into the charmonium state. We calculate the fragmentation functions describing the splitting of charm quarks into S-wave charmonium states...
1993-02-24
2014-11-17
[ "hep-ph" ]
Eric Braaten, Kingman Cheung, and Tzu Chiang Yuan
hep-ph/9302292
New Upper Limits on the Tau Neutrino Mass from Primordial Helium Considerations
In this paper we reconsider recently derived bounds on $MeV$ tau neutrinos, taking into account previously unaccounted for effects. We find that, assuming that the neutrino life-time is longer than $O(100~sec)$, the constraint $N_{eff}<3.6$ rules out $\nu_{\tau}$ masses in the range $0.5~(MeV)<m_{\nu_\tau}<35~(MeV)$ fo...
1993-02-23
2008-11-26
[ "hep-ph", "astro-ph" ]
A.D. Dolgov and I.Z. Rothstein
hep-ph/9302293
The Production of the Exotic Atoms $\pi^+\pi^-$, $K^+\pi^-$ and $K^+K^-$
Estimates are made of the signals to be expected in the production of the exotic atoms Pionium ($\pi^+\pi^-$), Kaonium ($K^+K^-$) and also $K^+\pi^-$ in pp, pd and $e^+e^-$ reactions. Such experiments are now being undertaken or contemplated at CELSIUS, COSY, Indiana and SATURNE.
1993-02-23
2009-10-22
[ "hep-ph" ]
S. Wycech (Soltan Institute for Nuclear Studies, Warsaw, Poland) and A.M. Green (Research Institute for Theoretical Physics, University of Helsinki, Finland)
hep-ph/9302291
Yukawa correction to top-quark production at the Tevatron
We calculate the correction to $\qbq\to\tbt$ of order $\gmm$. This correction, proportional to the square of the Higgs-boson Yukawa coupling to the top quark, arises from loops of Higgs bosons and the scalar component of virtual vector bosons. The Yukawa correction to the total \tbt\ production cross section at the Fer...
1993-02-23
2009-10-22
[ "hep-ph" ]
Alan Stange, Scott Willenbrock
hep-ph/9302294
Calculation of the contributions to the signals and backgrounds for intermediate mass Higgs detection at the LHC and SSC from the q qbar initial state
We calculate the subprocess q qbar --> t tbar H which contributes to the signal for detection of a light `intermediate mass' Higgs boson at the LHC and SSC in the isolated lepton and two isolated photons mode. This enhances the gg --> t tbar H signal by about 10% at the SSC and 25% at the LHC. We also calculate the q q...
1993-02-23
2009-10-22
[ "hep-ph" ]
David J. Summers
hep-ph/9302295
The Top Width - Theoretical update
A critical assessment of the available calculations of the top quark width is presented. QCD corrections, the finite mass of the $b$ quark and the effect of the $W$ width are included as well as the electroweak corrections. The relative importance of these corrections is demonstrated for the realistic range of top mass...
1993-02-23
2014-11-17
[ "hep-ph" ]
M. Je\.zabek and J.H. K\"uhn
hep-ph/9302290
Double Beta Decay with Vector Majorons
We consider the possibility that neutrinoless double beta decay may occur in models with unbroken lepton number via the emission of a massive gauge boson with electron lepton number $-2$. We determine the shape of the $\beta\,\beta$ sum energy spectrum as a function of the gauge coupling, independent of model-specific ...
1993-02-22
2009-10-22
[ "hep-ph" ]
Christopher D. Carone
hep-ph/9302288
Current Algebra Approach to Heavy Top Effects in $Z \rightarrow b+ \bar{b}$
The $O(\alpha m_t^2/m_w^2)$ and $O(\alpha \alpha_s m_t^2/m_w^2)$ corrections to the partial decay width $\Gamma(Z \rightarrow b + \bar{b})$ are computed using the current algebra formulation of radiative corrections. This framework allows one to easily enforce the relevant Ward identity that greatly simplifies the calc...
1993-02-22
2009-10-22
[ "hep-ph" ]
Giuseppe Degrassi
hep-ph/9302285
Consequences of a Possible Di-Gamma Resonace at TRISTAN
If high mass di-gamma events observed at LEP are due to the production of a di-gamma resonance via its leptonic coupling, its consequences can be observed at TRISTAN. We find that a predicted $Z$ decay branching rate is too small to account for the observed events if the resonance spin is zero, due to a strong cancella...
1993-02-22
2008-11-26
[ "hep-ph" ]
K.Hagiwara, S.Matsumoto and M.Tanaka
hep-ph/9302287
$SU(n)_c\otimes SU(m)_L\otimes U(1)_N$ generalizations of the Standard Model
We consider generalizations of the standard model (SM) which are based on the gauge symmetry $SU(n)_c\otimes SU(m)_L\otimes U(1)_N$. Although the most interesting possibilities occur when $n=3$, we will consider also the cases $n=4,5$ both with $m=3,4$. Models with left-right symmetry, horizontal symmetries and the pos...
1993-02-22
2008-02-03
[ "hep-ph" ]
V. Pleitez
hep-ph/9302286
Radiative Tau Decays with One Pseudoscalar Meson
We have calculated the decay $\tau \rightarrow \nu \pi(K) \gamma$. We present the photon energy spectrum, the meson-photon invariant mass spectrum and the integrated rate as a function of a photon energy cut or an invariant mass cut. Both the internal bremsstrahlung and the structure dependent radiation have been taken...
1993-02-22
2009-10-22
[ "hep-ph" ]
R. Decker and M. Finkemeier
hep-ph/9302289
Light Composite Vector Bosons
In gauge theories with slowly-running coupling constants, it may be possible for four-fermion operators to be nearly marginal. Such operators can possess asymptotically weak couplings, and can plausibly give rise to light composite vector mesons.
1993-02-22
2016-09-01
[ "hep-ph" ]
David A. Kosower
hep-ph/9302284
Measuring the Gamma-Gamma Coupling of the Higgs at Linear Colliders
Observing the production of the Higgs particle in the $\gamma$-$\gamma$ mode of a linear $e^+e^-$ collider allows for the measurement of the $H\gamma\gamma$ coupling. We point out that for the intermediate Higgs mass range this measurement is considerably more challenging than previously believed. The $b \bar b$ signat...
1993-02-20
2009-10-22
[ "hep-ph" ]
O.J.P. Eboli, M.C. Gonzalez-Garcia, F. Halzen and D. Zeppenfeld
hep-ph/9302283
Empirical Determination of the Very High Energy Heavy Quark Cross Section from Non-Accelerator Data
To cosmic rays incident near the horizon the Earth's atmosphere represents a beam dump with a slant depth reaching 36000~g~cm$^{-2}$ at $90^\circ$. The prompt decay of a heavy quark produced by very high energy cosmic ray showers will leave an unmistakable signature in this dump. We translate the failure of experiments...
1993-02-20
2009-10-22
[ "hep-ph" ]
M.C. Gonzalez-Garcia, F. Halzen, R.A. Vazquez, and E Zas
hep-ph/9302279
On the B and J/Psi Cross Section Measurements at Ua1 and CDF
We analise the implications of the measurement of $B$ and $J/\psi$ inclusive \pt\ distributions performed in $p\bar p$ collisions by the UA1 and CDF experiments.
1993-02-19
2009-10-22
[ "hep-ph" ]
Michelangelo MANGANO
hep-ph/9302281
Higgs - Two Photon Decay: QCD radiative correction
QCD radiative correction to Higgs $\rightarrow$ two photons decay rate is calculated. Below the threshold we found negligible correction, thus supporting results obtained earlier by Djouadi et all [7]. Above the threshold radiative correction appears to be large for both real and imaginary part of H $\gamma \gamma$ ver...
1993-02-19
2009-10-22
[ "hep-ph" ]
K.Melnikov and O.Yakovlev
hep-ph/9302280
One-Loop Corrections to Five-Gluon Amplitudes
We present the one-loop helicity amplitudes with five external gluons. The computation employs string-based methods, new techniques for performing tensor integrals, and improvements in the spinor helicity method.
1993-02-19
2010-11-15
[ "hep-ph" ]
Z. Bern, L. Dixon and D. A. Kosower
hep-ph/9302282
What is the Natural Size of Supersymmetric $CP$ Violation?
It is well known that if phases and masses in the Minimal Supersymmetric Standard Model (MSSM) are allowed to have general values, the resulting neutron EDM ($d_n$) exceeds the experimental upper limit by about $10^3$. We assume that the needed suppression is not due to a fine-tuning of phases or masses, and ask what n...
1993-02-19
2007-05-23
[ "hep-ph" ]
Robert Garisto and Gordy Kane
hep-ph/9302278
Toponium Tests Of Top-Quark Higgs Bags
Recently it has been suggested that top quarks, or very massive fourth generation quarks, might surround themselves with a Higgs "bag" of deformation of the Higgs expectation value from its vacuum magnitude. In this paper we address the question of whether such nonlinear Higgs-top interaction effects are subject to exp...
1993-02-19
2009-10-22
[ "hep-ph" ]
Alick L. Macpherson and Bruce A. Campbell
hep-ph/9302273
Right-handed Neutral Currents, Families and the LEP $l^+l^-\gamma\gamma$ Events
We explore the possibility of having new physics which could account for the $l^+l^-\gamma\gamma$ events with $M_{\gamma\gamma}\simeq 60\ $GeV recently reported by LEP. We consider models which contain an extra neutral gauge boson ($Z'$) that couples only to right-handed fermions. The models naturally require at least ...
1993-02-18
2007-05-23
[ "hep-ph" ]
C. Q. Geng, K. Whisnant and B. -L. Young
hep-ph/9302272
Errata for "The Higgs Hunter's Guide"
Errata are given for "The Higgs Hunter's Guide". These errata should be applied to the second printing of the book, dated 1991. The second printing has already corrected numerous errors and misprints contained in the originally published 1990 edition.
1993-02-18
2007-05-23
[ "hep-ph" ]
John F. Gunion, Howard E. Haber, Gordon L. Kane, and Sally Dawson
hep-ph/9302276
Charged Scalar Particles and $\tau$ Leptonic Decay
Charged scalar particles introduced in some extensions of the standard model can induce $\tau$ leptonic decay at tree level. We find that with some charged SU(2)-singlet scalar particles, like ones introduced in Zee-type models, $\tau$ leptonic decay width is always smaller than what is predicted by the standard model,...
1993-02-18
2009-10-22
[ "hep-ph" ]
Zhijian Tao
hep-ph/9302277
Derivation of $m_A \simeq M_Z$ and $\tan \beta > \sqrt 3$ in the Minimal Supersymmetric Standard Model
In the minimal supersymmetric standard model, the Higgs sector has two unknown parameters, usually taken to be $\tan \beta \equiv v_2/v_1$ and $m_A$, the mass of its one physical pseudoscalar particle. By minimizing the minimum of the Higgs potential along a certain direction in parameter space, it is shown that $m_A =...
1993-02-18
2009-10-22
[ "hep-ph" ]
Ernest Ma
hep-ph/9302275
Hard Photon Pair Production at LEP
The production of photon pairs in $e^+e^-\rightarrow f \bar f \gamma\gamma$ processes is studied using exact helicity amplitudes at tree level. Total cross sections, including initial state radiation effects, are given. They are presented in the case of quarks as a function of $y_{\rm cut}$ in the JADE algorithm. In th...
1993-02-18
2009-10-22
[ "hep-ph" ]
A. Ballestrero, E. Maina and S. Moretti
hep-ph/9302274
Vanishing of Nonabelian Berry Phases in Heavy Solitonic Baryons
In this article, we show -- using a reasoning applicable to both the excitation spectrum in the chiral bag model and the hyperfine structure of diatomic molecules -- that the generic form of a non- abelian Berry potential appears in heavy-quark effective theory (HQET) and that the Berry potential vanishes for the solit...
1993-02-18
2010-11-01
[ "hep-ph" ]
Hyun Kyu Lee and Mannque Rho
hep-ph/9302266
Do Quarks Really Form Diquark Clusters in the Nucleon?
A gauge invariant method for the investigation of scalar diquark clustering in the nucleon ground state is presented. The method focuses on a comparison of quark distributions in the nucleon with those in the $\Delta$ baryon resonance. Recent lattice QCD calculations of these quark distribution radii are analyzed in a ...
1993-02-17
2009-10-22
[ "hep-ph", "hep-lat" ]
Derek B. Leinweber
hep-ph/9302270
Very Small Strangelets
We study the stability of small strangelets by employing a simple model of strange matter as a gas of non-interacting fermions confined in a bag. We solve the Dirac equation and populate the energy levels of the bag one quark at a time. Our results show that for system parameters such that strange matter is unbound in ...
1993-02-17
2009-10-22
[ "hep-ph" ]
E. P. Gilson and R. L. Jaffe
hep-ph/9302267
Two--loop Contributions of Flavor Changing Neutral Higgs Boson to $\mu \to e\gamma$
The two--loop mechanism of Bjorken and Weinberg is used to constrain flavor changing neutral Higgs bosons. We calculate the complete set of two--loop diagrams for the rare decay $\mu \rightarrow e + \gamma$ induced by such neutral Higgs bosons, for arbitrary Higgs and top masses. The analytic result is used to set limi...
1993-02-17
2009-09-01
[ "hep-ph" ]
D. Chang, W.-S Hou and W.-Y. Keung
hep-ph/9302271
$Z$--$Z'$ mixing and oblique corrections in an ${\rm SU(3) \times U(1)}$ model
A global fit for experiments is included in this revised version.
1993-02-17
2014-11-17
[ "hep-ph" ]
James T. Liu and Daniel Ng
hep-ph/9302268
The Electric and Magnetic Form Factors of the Neutron
We derive the electric and magnetic form factors of the neutron in the framework of a relativistic constituent quark model. Our parameter free prediction agrees well with a recent, accurate measurement. The relativistic features of the model and the specific form of the wave function are essential for the result. Compa...
1993-02-17
2015-06-25
[ "hep-ph" ]
Felix Schlumpf
hep-ph/9302269
Reparametrization invariance and the expansion of currents in the heavy quark effective theory
The coefficients appearing at leading and subleading order in the $1/m$ expansion of bilinear heavy quark currents are related to each other by imposing reparametrization invariance on both the effective current operators and the short-distance coefficient functions in the heavy quark effective theory. When combined wi...
1993-02-17
2009-10-22
[ "hep-ph" ]
Matthias Neubert
hep-ph/9302264
Strong renormalization scheme dependence in $\tau$-lepton decays: fact or fiction?
The question of the renormalization scheme dependence of the $\tau$ semileptonic decay rate is revisited in response to a recent criticism. Particular attention is payed to a distinction between a consistent quantitative description of this dependence and the actual selection of a subset of ``acceptable'' renormalizati...
1993-02-16
2016-08-14
[ "hep-ph" ]
J.Ch\'yla
hep-ph/9302262
Multi-Higgs Doublet Model: Can It Account for l^+l^-\gamma\gamma Events?
Motivated by recent experiments at LEP ($Z \to l^+l^-\gamma\gamma$, with $M_{\gamma\gamma} \simeq 59 GeV$), we examine the possibility that such events are explained by a Bjorken process with a resonant Higgs ($M_{h^o} \simeq 59 GeV$) decaying to $\gamma\gamma$. Our model is an N-doublet-Higgs model without CP-violatio...
1993-02-16
2008-11-26
[ "hep-ph" ]
G. Cvetic, M. Nowakowski and Y.-L. Wu
hep-ph/9302263
$J/\psi$ at small-$x$
It has been suggested that the suppression of $J/\psi$ production in heavy nuclei is a signature of the formation of quark-gluon plasma. We here show that this phenomenon can be understood in terms of conventional physics, {\it i.e.} {\it i)} perturbative QCD, {\it ii)} the parton recombination implementation of shadow...
1993-02-16
2007-05-23
[ "hep-ph" ]
M. A. Doncheski, M. B. Gay Ducati and F. Halzen
hep-ph/9302265
Excited Heavy Mesons and Kaon Loops in Chiral Perturbation Theory
We consider the effects of excited states on the $SU(3)$ breaking chiral loop corrections to heavy meson properties. In particular, we compare the size of kaon loops in which an excited heavy meson appears to the size of previously calculated loops with heavy mesons in the ground state. We find that the new effects may...
1993-02-16
2009-10-22
[ "hep-ph" ]
Adam F. Falk
hep-ph/9302261
Neutrino-Lasing in The Early Universe
Recently, Madsen has argued that relativistic decays of massive neutrinos into lighter fermions and bosons may lead, via thermalization, to the formation of a Bose condensate. If correct, this could generate mixed hot and cold dark matter, with important consequences for structure formation. From a detailed study of ...
1993-02-15
2009-10-22
[ "hep-ph", "astro-ph" ]
N. Kaiser, R. A. Malaney, G.D. Starkman
hep-ph/9302260
Coupling Constant Unification and LEP Data
The recent LEP data for gauge coupling constants constrain many grand unified models. In this paper, we study several possibilities for unification of gauge coupling constants. Without an intermediate mass scale, the minimal supersymmetric standard model is the only possibility. For one intermediate mass scale, it is p...
1993-02-15
2007-05-23
[ "hep-ph" ]
Hang Bae Kim and Jihn E. Kim
hep-ph/9302258
One-loop fluctuation-dissipation formula for bubble-wall velocity
The limiting bubble wall velocity during a first-order electroweak phase transition is of interest in scenarios for electroweak baryogenesis. Khlebnikov has recently proposed an interesting method for computing this velocity based on the fluctuation-dissipation theorem. I demonstrate that at one-loop order this method ...
1993-02-13
2010-02-16
[ "hep-ph" ]
Peter Arnold
hep-ph/9302259
Supersymmetric Dark Matter - a Review
I address the question of whether supersymmetry provides a viable candidate for the dark matter in the Universe. I review the properties of the lightest neutralino as a candidate for solving the dark matter problem. I discuss the neutralino's phenomenological and cosmological properties, and constraints from present an...
1993-02-13
2007-05-23
[ "hep-ph", "astro-ph" ]
Leszek Roszkowski
hep-ph/9302255
Could Large CP Violation Be Detected at Colliders?
We argue that CP--violation effects below a few tenths of a percent are probably undetectable at hadron and electron colliders. Thus only operators whose contributions interfere with tree--level Standard Model amplitudes are detectable. We list these operators for Standard Model external particles and some two and thre...
1993-02-12
2010-11-01
[ "hep-ph" ]
C. Im, G. Kane, P. Malde
hep-ph/9302256
Resolved Photon Processes
We review high--energy scattering processes that are sensitive to the hadronic structure of the photon, describing theoretical predictions as well as recent experimental results. These processes include deep--inelastic electron--photon scattering at \eplem\ colliders; and the production of jets, heavy quarks and isolat...
1993-02-12
2010-11-01
[ "hep-ph" ]
Manuel Drees and Rohini M. Godbole
hep-ph/9302257
Longitudinal Structure Function at Intermediate x and the Gluon Density
Calculations are presented of the longitudinal structure function $F_L(x, Q^2)$. We use next-to-leading order expressions in QCD $({\cal{O}}(\alpha_s^2))$ plus parton densities determined previously from global fits to data on deep inelastic lepton scattering, prompt photon production, and bottom quark production. Anti...
1993-02-12
2014-11-17
[ "hep-ph" ]
Edmond L. Berger and Ruibin Meng
hep-ph/9302254
Gamma Ray Bursts from Ordinary Cosmic Strings
We give an upper estimate for the number of gamma ray bursts from ordinary (non-superconducting) cosmic strings expected to be observed at terrestrial detectors. Assuming that cusp annihilation is the mechanism responsible for the bursts we consider strings arising at a GUT phase transition and compare our estimate wit...
1993-02-12
2016-09-01
[ "hep-ph", "astro-ph" ]
R. H. Brandenberger, A. T. Sornborger and M. Trodden (Brown University)
hep-ph/9302249
Angular Intermittency in QCD Jets
Using two methods, via fluctuations and correlations, an analytical formula is derived for the factorial multiplicity moments in a QCD jet at the Double Leading Logarithm accuracy. The resulting self-similar dependence on the solid-angle cell size is characteristic of an intermittency behaviour in angular variables. Th...
1993-02-11
2008-11-26
[ "hep-ph" ]
Ph. Brax, J.-L. Meunier, R. Peschanski
hep-ph/9302252
Boson Pair Productions In $e^+$ $e^-$ Annihilation
We examine the processes $e^+ e^-\longrightarrow W^+ W^-$ and $Z^0 Z^0$ in the context of the $SP(6)_L\otimes U(1)_Y$ model. We find that there are significant deviations in the total cross sections $\sigma (s)$ from the standard model results due to the presence of additional gauge bosons $Z^\prime$ and $W^\prime$ in ...
1993-02-11
2008-11-26
[ "hep-ph" ]
T.K. Kuo, Gye T. Park, and M. Zralek
hep-ph/9302250
Properties of Soft Radiation Near $\tt$ and $W^+W^-$ Threshold
We discuss the characteristic interference features of soft radiation in the threshold production of heavy unstable particles: soft gluon radiation in $\ee \to \tt$ and soft photon radiation in $\ee \to \ww$. We show that the heavy particle decay width controls the interference between the emission off the final state ...
1993-02-11
2009-10-22
[ "hep-ph" ]
Yu.L. Dokshitzer, V.A. Khoze, L.H. Orr, and W.J. Stirling
hep-ph/9302247
Recent Developments in Chiral Perturbation Theory
I review recent developments in chiral perturbation theory (CHPT) which is the effective field theory of the standard model below the chiral symmetry breaking scale. The effective chiral Lagrangian formulated in terms of the pseudoscalar Goldstone bosons ($\pi, \, K, \, \eta$) is briefly discussed. It is shown how one ...
1993-02-11
2010-12-17
[ "hep-ph", "nucl-th" ]
Ulf-G. Mei{\ss}ner
hep-ph/9302253
Constraints on New Physics From Tevatron Dijet Data
New results from the CDF Collaboration on the invariant mass distribution of dijet events observed at the Tevatron are used to constrain the masses and couplings of new gauge bosons ($W'$ and $Z'$) as well as fundamental diquarks which can occur in some extended electroweak models. In the case of new gauge bosons, thes...
1993-02-11
2008-11-26
[ "hep-ph" ]
Thomas G. Rizzo
hep-ph/9302251
Search for Anomalous $\gamma\gamma$ Production at TRISTAN
We report on measurements of the total cross section for e+e- --> 2-Gamma for center-of-mass energies between 57.4 and 59.5 GeV, using the AMY detector at the TRISTAN collider. We set new limits on the production of a possible new s-channel resonance decaying into photon pairs.
1993-02-11
2008-11-26
[ "hep-ph" ]
K. L. Sterner, et al. ( The AMY Collaboration )
hep-ph/9302246
Massive Spin-1 Field Chiral Lagrangian from an Extended Nambu-Jona-Lasinio Model of QCD
We present a calculation of the coupling constants in the massive spin-1 field chiral Lagrangian to chiral ${\cal O}(p^3)$ in the context of an extended Nambu--Jona-Lasinio cut-off model. Phenomenological applications of this Lagrangian to anomalous and non-anomalous low-energy hadronic transitions involving spin-1 par...
1993-02-11
2009-10-22
[ "hep-ph" ]
Joaquim Prades
hep-ph/9302248
Large Rapidity Gaps in PP Collisions
The survival probability of large rapidity gaps in pp collisions is calculated for several different eikonal models of the Gaussian form. Results obtained for models based on partonic interactions are quite similar. The Regge-pole model predicts a higher value of $ < \vert S \vert^{2} > $ .
1993-02-11
2011-05-05
[ "hep-ph" ]
E. Gotsman, E.M. Levin and U. Maor (School of Physics and Astronomy,Tel Aviv University and Fermi National Accelerator Laboratory, Batavia, Ill)
hep-ph/9302245
Strong and Radiative Meson Decays in a Generalized Nambu--Jona-Lasinio Model
We investigate strong and radiative meson decays in a generalized Nambu--Jona-Lasinio model. The one loop order calculation provides a satisfactory agreement with the data for the mesonic spectrum and for radiative decays. Higher order effects for strong decays of $\rho$ and $K^*$ are estimated to be large. We also dis...
1993-02-10
2009-10-22
[ "hep-ph", "nucl-th" ]
V. Bernard, A.H. Blin, B. Hiller, U.-G. Mei{\ss}ner and M.C. Ruivo
hep-ph/9302242
Damping rates for moving particles in hot QCD
Using a program of perturbative resummation I compute the damping rates for fields at nonzero spatial momentum to leading order in weak coupling in hot $QCD$. Sum rules for spectral densities are used to simplify the calculations. For massless fields the damping rate has an apparent logarithmic divergence in the infrar...
1993-02-09
2009-10-22
[ "hep-ph" ]
R. D. Pisarski
hep-ph/9302243
On Fermion Zero-Modes in Instanton $V-A$ Models With Spontaneous Symmetry Breaking
The left and right handed fermion zero-modes are examined. Their behaviour under the variation of the size of the instanton, $\ri$, and the size of the Higgs core, $\rh$, for a range of Yukawa couplings corresponding to the fermion masses in the electroweak theory are studied. It is shown that the characteristic radii ...
1993-02-09
2015-06-25
[ "hep-ph" ]
Kamran Saririan
hep-ph/9302244
Effective Lagrangian for $b \rightarrow s$ Processes with QCD-Corrections
We present a complete calculation of the effective lagrangian for $b \rightarrow s$ processes with $QCD$ corrections, in the leading logarithm approximation, for the cases $m_t=m_w$ and $m_t \gg m_w$. The effective lagrangian is then applied to estimate the $b \rightarrow s \gamma$ decay rate. We find that it is enhanc...
1993-02-09
2019-06-05
[ "hep-ph" ]
K. Adel and York-Peng Yao
hep-ph/9302236
Baryon Asymmetry, Supersymmetry and Gravitational Anomalies
We discuss two independent issues about the baryon asymmetry of the universe. First, assuming that it is generated by an unspecified source at high temperatures, we study the effects of non-perturbative $SU(2)_W$ dynamics above the electroweak scale, in the context of supersymmetric models. We find that there is a subs...
1993-02-09
2009-10-22
[ "hep-ph" ]
Luis E. Ibanez and Fernando Quevedo
hep-ph/9302238
Quark Propagation in the Random Instanton Vacuum
This is the first of a series of papers devoted to a systematic study of QCD correlation functions in a framework of 'instanton vacuum' models. The topic of this paper is to work out approximate formulae for quark propagators in a multi-instanton environment. As an application, and also as a necessary step toward under...
1993-02-09
2009-10-22
[ "hep-ph" ]
E.V. Shuryak and J.J.M. Verbaarschot
hep-ph/9302239
Mesonic Correlation Functions in the Random Instanton Vacuum
A general model-independent discussion of mesonic correlation functions is given. We derive new inequalities, including one stronger than Weingarten's inequality. Mesonic correlation functions are calculated in the random instanton vacuum and are compared with phenomenological expectations and lattice results. Both dia...
1993-02-09
2009-10-22
[ "hep-ph" ]
E.V. Shuryak and J.J.M. Verbaarschot
hep-ph/9302237
Experimental Constraints on the Neutrino Oscillations and a Simple Model of Three Flavour Mixing
A simple model of the neutrino mixing is considered, which contains only one right-handed neutrino field, coupled via the mass term to the three usual left-handed fields. This is a simplest model that allows for three-flavour neutrino oscillations. The existing experimental limits on the neutrino oscillations are used ...
1993-02-09
2009-10-22
[ "hep-ph" ]
Piotr A. R\c{a}czka, Andrzej Szymacha and Stanis{\l}aw Tatur