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hep-ph/9304292
$N_c$-counting rules and the axial vector coupling constant of the constituent quark
Instead of using a simple reggeon-exchange model, we provide a model-independent estimate of high-energy contribution to the Adler-Weisberger sum-rule. Results and conclusions of the paper remain unchanged.
1993-04-23
2010-12-16
[ "hep-ph" ]
W. Broniowski, M. Lutz and A. Steiner
hep-ph/9304290
Detecting an Intermediate Mass Charged Higgs at $\gamma \gamma$ Colliders
The detection of an intermediate mass charged Higgs boson at $\gamgam$ colliders via the modes $\gamgam \to H^+ H^- \to \nu \tau^+ \bar{\nu} \tau^-,~ c \bar{s} \bar{c} s,~$ and $ \nu \tau^+ \bar{c}s + c \bar{s} \bar{\nu} \tau^-$ is considered. $W^+ W^-$ boson pair production is the dominant background for these modes. ...
1993-04-23
2009-10-22
[ "hep-ph" ]
David Bowser-Chao, Kingman Cheung, and Scott Thomas
hep-ph/9304287
Spectral Densities and Borel Transforms in Compton Scattering
We show that the leading double spectral density in sum rules for Compton-like processes can be obtained by simple properties of the Borel transform, extending an approach widely used in the literature on sum rules, and known to be valid only for the spectral densities of form factors. The extension is illustrated in t...
1993-04-22
2025-02-05
[ "hep-ph" ]
Claudio Corian\`o
hep-ph/9304289
On the Determination of the Gluon Density of the Proton from Heavy-Flavour Production at HERA
Using a recent next-to-leading-order calculation of the photoproduction double differential cross section for heavy quarks, we study the possibility of extracting the gluon density of the proton from heavy-quark photoproduction data. We discuss the theoretical uncertainties connected with this method, and we conclude t...
1993-04-22
2010-11-01
[ "hep-ph" ]
Stefano Frixione Michelangelo L. Mangano Paolo Nason and Giovanni Ridolfi
hep-ph/9304288
A Model of Universality Violation Revisited
The possibility that the interactions of the third generation of quarks and leptons may violate universality by a small amount remains an open experimental question. The model of Li and Ma, which naturally accommodates such violations, is found to be highly constrained by newly obtained, high precision electroweak and ...
1993-04-22
2009-10-22
[ "hep-ph" ]
T.G. Rizzo
hep-ph/9304284
On Daisy and Superdaisy Resummation of the Effective Potential at Finite Temperature
We describe in detail, in the context of the simple scalar $\phi^4$ theory, the prescription for resummation of daisy and superdaisy diagrams in the effective potential using the solution of the gap equations in the infrared limit. We find that the latter procedure is consistent provided we neglect logarithmic terms fr...
1993-04-21
2007-05-23
[ "hep-ph" ]
Mariano Quir\'os
hep-ph/9304280
Hadronic Transitions among Quarkonium States in a Soft-Exchange-Approximation. Chiral Breaking and Spin Symmetry Breaking Processes
Although no asymptotic heavy quark spin symmetry, and even more no flavor symmetry, are expected for systems such as quarkonium, a numerical discussion shows that for some processes and in a preasymptotic region which may roughly include charmonium and bottomonium, the use of the spin-symmetry may be useful in conjunct...
1993-04-21
2010-11-01
[ "hep-ph" ]
R. Casalbuoni, A. Deandrea, N. Di Bartolomeo, R. Gatto, F. Feruglio and G. Nardulli
hep-ph/9304286
Cabibbo-allowed nonleptonic weak decays of charmed baryons
Cabibbo-allowed nonleptonic weak decays of charmed baryons $\lamc,~\xin,~\xip$ and $\Omega_c^0$ into an octet baryon and a pseudoscalar meson are analyzed. The nonfactorizable contributions are evaluated under pole approximation, and it turns out that the $s$-wave amplitudes are dominated by the low-lying $\halfm$ reso...
1993-04-21
2014-11-17
[ "hep-ph" ]
Hai-Yang Cheng and B. Tseng
hep-ph/9304283
Asymptotic behaviour of the total cross section of p-p scattering and the Akeno cosmic ray data
I present a new determination of the total cross section for proton-proton collisions from the recent Akeno results on absorption of the cosmic ray protons in the p-Air collisions. Extrapolation to the SSC energy suggests $\sigma_{tot}(p-p) \approx (160-170) mb$. I also comment on a possible sensitivity of the p-Air cr...
1993-04-21
2009-12-30
[ "hep-ph" ]
N.N.Nikolaev
hep-ph/9304282
The Effects of the Massless O(alpha_s^2), O(\alpha\alpha_s), O(\alpha^2) QCD and QED Corrections and of the Massive Contributions to Gamma(H^0\rightarrow b\overline{b})
We consider in detail various theoretical uncertainties of the perturbative predictions for the decay width of $H^0\rightarrow b\overline{b}$ process in the region $50\ GeV< M_H\leq 2M_W$. We calculate the order $O(\alpha_s^2)$-contributions to the expression for $\Gamma_{Hb\overline{b}}$ through the pole quark mass an...
1993-04-21
2007-05-23
[ "hep-ph" ]
A.L.Kataev and V.T.Kim
hep-ph/9304278
The vacuum structure in a supersymmetric gauged Nambu-Jona-Lasinio model
The dynamical breakdown of the $SU(2) \times U(1)$ symmetry triggered by a top-antitop condensate is studied in a supersymmetric version of the gauged Nambu-Jona-Lasinio model. An effective potential approach is used to investigate the vacuum structure and the equivalence with the minimal supersymmetric standard model....
1993-04-21
2009-10-22
[ "hep-ph" ]
P. Binetruy, E.A. Dudas and F. Pillon
hep-ph/9304281
Non-Standard Gauge-Boson Self-Interactions within a Gauge Invariant Model
We examine dimension-six extensions of the standard electroweak Lagrangian which are invariant under local \suu -transformations. The dimension-four trilinear and quadrilinear effective interactions of the vector bosons with one another are found to coincide with the vector boson interactions previously derived from gl...
1993-04-21
2009-10-22
[ "hep-ph" ]
Carsten Grosse-Knetter, Ingolf Kuss and Dieter Schildknecht
hep-ph/9304285
Oblique electroweak corrections and triple vector boson couplings
We relate all $C$-- and $P$--invariant anomalous triple vector--boson couplings to the oblique electroweak parameters. LEP constraints on the latter then yield the strongest and most general simultaneous bounds to date on the former. Even if the oblique parameters assume their Standard Model values precisely, these bou...
1993-04-21
2008-02-03
[ "hep-ph" ]
Debajyoti Choudhury, Probir Roy and Rahul Sinha
hep-ph/9304274
Consistency and lattice renormalization of the effective theory for heavy quarks
The effective theory describing infinite mass particles with a given velocity, has a great interest in heavy flavor physics. It has the unpleasant characteristic that the energy spectrum is unbounded from below; this fact is the source of the problems in the formulation of the euclidean theory. In this paper we present...
1993-04-20
2010-11-01
[ "hep-ph" ]
Ugo Aglietti
hep-ph/9304277
Probing supergravity models with the $b\to s\gamma$ microscope
We present a calculation of the branching ratio $\brbsg$ in two well motivated supersymmetric models: the minimal $SU(5)$ and the no-scale flipped $SU(5)$ supergravity models. We find that the improved CLEO upper bound ($\brbsg<5.4\times10^{-4}$ at 95\% CL) does not yet constrain the minimal $SU(5)$ supergravity model,...
1993-04-20
2009-12-30
[ "hep-ph" ]
J. Lopez, D. Nanopoulos, and G. Park
hep-ph/9304276
Diffraction and the Gluon Mass
We recently proposed a QCD-Pomeron described by the exchange of two non-perturbative gluons characterized by a dynamically generated gluon mass. It is here shown that data on elastic scattering, exclusive $\rho$ production in deep inelastic scattering and the $J/\Psi$-nucleon total cross-section can be successfully des...
1993-04-20
2011-07-19
[ "hep-ph" ]
M.B. Gay Ducati, F. Halzen, and A.A. Natale
hep-ph/9304273
Chemical equilibrium in QCD gas in the early universe
We compute the thermally averaged $\qq$--annihilation rate into two and three gluons in the early universe. We show that at very high temperatures $\qq\to ggg$ represents only a 3\%\ correction to $\qq\to gg$. Comparing the annihilation rate to the Hubble rate, corrected for particle interactions in the Standard Model ...
1993-04-20
2009-10-22
[ "hep-ph" ]
Kari Enqvist and Jukka Sirkka
hep-ph/9304279
Supersymmetric Corrctions to Masses and Widths
Supersymmetric radiative corrections to the partial width $\Gamma (\tau \rightarrow e \nu \bar{\nu})$ and the masses of the $W$ and $Z$ gauge bosons are calculated in different renormalization schemes. The importance of the non-universal contributions is analyzed.
1993-04-20
2008-02-03
[ "hep-ph" ]
P. Gosdzinsky
hep-ph/9304275
Chiral Corrections to the S-Wave Pion-Nucleon Scattering Lengths
We calculate the chiral corrections to Weinberg's prediction for the S--wave $\pi N$ scattering lengths up--to--and--including order ${\cal O}(M_\pi^3)$ making use of heavy baryon chiral perturbation theory. For the isospin--odd scattering length $a^-$ these corrections are small and bring the prediction closer to the ...
1993-04-20
2009-10-22
[ "hep-ph", "nucl-th" ]
V. Bernard, N. Kaiser and Ulf-G. Mei{\ss}ner
hep-ph/9304272
Dynamics of Phase Transitions Induced by a Heat Bath
We study the non-equilibrium dynamics of a symmetry restoring phase transition in a scalar field theory, the ``system'', linearly coupled to another scalar field taken as a ``heat bath''. The ``system'' is initially in an ordered low temperature phase, and the heat bath is at a temperature close to the critical tempera...
1993-04-19
2014-11-17
[ "hep-ph" ]
Da-Shin Lee and Daniel Boyanovsky
hep-ph/9304270
Electromagnetic Production of Quarkonium in $Z^{0}$ decay
The decay $Z^{0}\rightarrow Q+ \ell^{+}\ell^{-}$, where $Q$ is a $J^{PC}=1^{--}$ quarkonium state, has a very clean final state, which should make it easy to detect. The branching ratio of this mode is greater than $10^{-6}$ for $\rho$, $\phi$, and $\psi$, indicating that these processes may be detectable at LEP.
1993-04-19
2009-10-22
[ "hep-ph" ]
Sean Fleming
hep-ph/9304267
Spontaneous CP Violation and Baryogenesis in the Minimal Supersymmetric Standard Model
We investigate the effects of the spontaneous CP violation at finite temperature in the Minimal Supersymmetric Standard Model on the baryogenesis at the weak scale. After a brief discussion of the case in which the electroweak phase transition is of the second order, we study in details the baryogenesis scenario when t...
1993-04-19
2010-03-17
[ "hep-ph" ]
D. Comelli, M. Pietroni and A. Riotto
hep-ph/9304269
Custodial SU(2) Violation and the Origin of Fermion Masses
Custodial $SU(2)$ breaking due to dynamical fermion masses is studied in a rather general context and it is shown how some well known limiting cases are correctly described. The type of ``gap equation'' which can systematically lead to extra negative contributions to the so--called $\rho$--parameter is emphasized. Furt...
1993-04-19
2009-10-22
[ "hep-ph" ]
A. Blumhofer and M. Lindner
hep-ph/9304268
A QCD Relation Between Hyperfine Splittings in Isospin doublets - A Light Quark Symmetry?
Recent data on the $D^*$ masses confirm the QCD prediction based on the \REF{\ICHJL}{Isaac Cohen and Harry J. Lipkin, \plb{84}{323}{1979}} very general assumption $\({\ICHJL}\)$ that the spin-dependence of the quark couplings to photons and gluons have the same structure and differ only in the value of the coupling con...
1993-04-19
2009-10-22
[ "hep-ph" ]
Harry J. Lipkin
hep-ph/9304271
Overview of Accelerator Long Baseline Neutrino Oscillation Experiments
There is renewed interest in performing a long baseline neutrino oscillation experiment using accelerator neutrinos because of a discrepancy between the measured and the predicted values of the ratio of electron to muon neutrinos produced in the upper atmosphere by cosmic rays.The approximate range in oscillation param...
1993-04-19
2007-05-23
[ "hep-ph" ]
Stephen Parke
hep-ph/9304266
Unconventional superstring derived E$_{\bf 6}$ models and neutrino phenomenology
Conventional superstring derived E$_6$ models can accommodate small neutrino masses if a discrete symmetry is imposed which forbids tree level Dirac neutrino masses but allows for radiative mass generation. Since the only possible symmetries of this kind are known to be generation dependent, we explore the possibility ...
1993-04-18
2009-10-22
[ "hep-ph" ]
Enrico Nardi
hep-ph/9304262
Constituent Quark Couplings and QCD in the Large $N_c$ Limit
It is shown that in the constituent quark model of Georgi-Manohar, the dispersion relation that leads to the Adler-Weisberger sum rule for the axial vector coupling $g_A$ requires a subtraction constant. This fact explains the discrepancy between the results of different recent estimates of the $1/N_c$ corrections to W...
1993-04-16
2008-11-26
[ "hep-ph" ]
Santiago Peris and Eduardo de Rafael
hep-ph/9304263
Constraints on Anomalous Gauge Boson Couplings From $b \to s\gamma$
The recent results of the CLEO Collaboration on both inclusive and exclusive radiative $B$ decays are combined with those of the UA2 Collaboration on $W\gamma$ production to highly constrain the anomalous trilinear gauge couplings of the $W$. The theoretical analysis of the $b \to s\gamma$ process employs, next-to-lead...
1993-04-16
2009-09-09
[ "hep-ph" ]
T.G.Rizzo
hep-ph/9304261
Valley Method Versus Instanton-Induced Effective Lagrangean Up to $(E/E_{\rm sphaleron})^{8/3}$
We compare the two most popular approaches to the problem of instanton-antiinstanton interaction at high energies - the valley method and the effective-Lagrangian approach - and use them to calculate the next-to-next-to-leading term in the expansion of ``holy grail'' function determining the cross section with baryon n...
1993-04-16
2009-10-22
[ "hep-ph" ]
I. Balitsky and A. Sch\"afer
hep-ph/9304264
Hadronic contribution to the photon vacuum polarization: a theoretical estimate
A simple model for the hadronic contribution to the photon vacuum polarization function $\Pi_{had}(q^2)$, for spacelike momenta, is presented. For small momenta, the two loop contribution from the pseudoscalar meson octet is computed from the chiral Lagrangian. The light quark contribution (which at low momentum gives ...
1993-04-16
2009-10-22
[ "hep-ph" ]
B. Holdom, Randy Lewis and Roberto R. Mendel
hep-ph/9304260
Is Geodetic Precession of Massive Neutrinos the solution to the Solar Neutrino Problem?
We examine a recent suggestion by Milburn that slightly massive electron neutrinos, produced left-handed at the core of the sun, suffer geodetic precession adequate to render them right-handed (and therefore sterile) in sufficient numbers to solve the solar neutrino problem. In that light, we perform a complete, genera...
1993-04-16
2010-04-06
[ "hep-ph", "gr-qc" ]
Stamatis Vokos
hep-ph/9304259
Parke-Taylor amplitudes in the multi-Regge kinematics
The Parke-Taylor multigluon amplitudes are examined in the multi-Regge kinematics, which assumes strong rapidity ordering of the produced gluons, and are used to compute the $n$-gluon production cross section and the gluon-gluon total cross section.
1993-04-16
2009-10-22
[ "hep-ph" ]
Vittorio Del Duca
hep-ph/9304265
Chiral Dynamics and Heavy Quark Symmetry in a Toy Field Theoretic Model
We study a solvable QCD--like toy theory, a generalization of the Nambu--Jona-Lasinio model, which implements chiral symmetries of light quarks and heavy quark symmetry. The chiral symmetric and chiral broken phases can be dynamically tuned. This implies a parity doubled heavy--light meson system, corresponding to a $(...
1993-04-16
2010-11-01
[ "hep-ph" ]
William A. Bardeen, and Christopher T. Hill
hep-ph/9304256
Electroweak bubbles and sphalerons
We consider non-perturbative solutions of the Weinberg-Salam model at finite temperature. We employ an effective temperature-dependent potential yielding a first order phase transition. In the region of the phase transition, there exist two kinds of static, spherically symmetric solutions: sphalerons and bubbles. We an...
1993-04-15
2009-10-22
[ "hep-ph" ]
Yves Brihaye and Jutta Kunz
hep-ph/9304254
Resummation Methods at Finite Temperature: The Tadpole Way
We examine several resummation methods for computing higher order corrections to the finite temperature effective potential, in the context of a scalar $\phi^4$ theory. We show by explicit calculation to four loops that dressing the propagator, not the vertex, of the one-loop tadpole correctly counts ``daisy'' and ``su...
1993-04-15
2011-07-19
[ "hep-ph" ]
C. Glenn Boyd, David E. Brahm, and Stephen D.H. Hsu
hep-ph/9304257
The $\Delta S=1$ Effective Hamiltonian Including Next-to-Leading Order QCD and QED Corrections
In this paper we present a calculation of the $\Delta S=1$ effective weak Hamiltonian including next-to-leading order QCD and QED corrections. At a scale $\mu$ of the order of few GeV, the Wilson coefficients of the operators are given in terms of the renormalization group evolution matrix and of the coefficients compu...
1993-04-15
2009-10-22
[ "hep-ph" ]
M. Ciuchini, E. Franco, G. Martinelli, L. Reina
hep-ph/9304255
Model Independent Higgs Boson Mass Limits at LEP
We derive model-independent constraints on Higgs mass and couplings from associated signals for higher masses, accessible at LEP2. This work is motivated by the fact that, in many extensions of the standard model, the Higgs boson can have substantial "invisible" decay modes, for example, into light or massless weakly i...
1993-04-15
2009-09-17
[ "hep-ph" ]
A. Lopez-Fernandez, J. C. Rom\~ao, F. de Campos and J. W. F. Valle
hep-ph/9304258
Quarkonium Decays and Light Quark Masses
The $SU(3)$-violating decays $\Phi^{2S} \goto \Phi^{1S} X$, where $X = \pi^0$ or $\eta$ and $\Phi = J/\psi$ or $\Upsilon$ have been recently proposed as a means of probing the light quark masses beyond leading order in chiral perturbation theory. We argue that this analysis is incorrect, even in the heavy quark limit. ...
1993-04-15
2009-09-15
[ "hep-ph" ]
Markus A. Luty and Raman Sundrum
hep-ph/9304251
Decay-Time Asymmetries at the B-Factories
Absract (Invited talk at the X DAE High Energy Physics symposium in December 1992, held at Tata Institute of Fundamental Research, Bombay)
1993-04-14
2010-11-01
[ "hep-ph" ]
K. V. L. Sarma
hep-ph/9304253
QCD Sum Rules: The Second Decade
Invited Talk at the Conference "QCD -- 20 Years Later", June 9 - 13, 1992, Aachen, Germany
1993-04-14
2007-05-23
[ "hep-ph" ]
M.A. Shifman (TPI, University of Minnesota)
hep-ph/9304252
Selected Topics on Rare Kaon Processes - in the Standard Model and Supergravity -
Rare kaon processes appear to be particularly suitable to study the extensions of the standard model, especially if the possibility for eventual direct evidence becomes unlikely. In this review, we discuss processes that are important as a test of either the standard model or supergravity. Moreover, some of these are i...
1993-04-14
2010-11-01
[ "hep-ph" ]
Neven Bilic and Branko Guberina
hep-ph/9304247
A Predictive Inflationary Scenario Without The Gauge Singlet
We propose a new realization of the chaotic inflationary scenario in which the scalar field responsible for inflation also spontaneously breaks the underlying gauge symmetry at a superheavy scale $\sim 10^{15} - 10^{17}\; GeV$. A possible framework is provided by the superstring inspired gauge models, in which case sev...
1993-04-13
2008-11-26
[ "hep-ph" ]
G. Lazarides and Q. Shafi
hep-ph/9304246
Nuclear Force in the Skyrme Model: Quasistatic Approach
Dynamics of two-Skyrmion systems is studied in the quasistatic approach. The quasistatic approach enables us to formulate the collective coordinate quantization of two-Skyrmion systems consistently with the 1/Nc expansion. By constructing quasistatic field configurations for largely separated two Skyrmions, their energ...
1993-04-13
2010-11-01
[ "hep-ph" ]
Makoto Oka
hep-ph/9304248
Identifying the Higgs Boson in Electron--Photon Collisions
We analyze the production and detection of the Higgs boson in the next generation of linear $e^+e^-$ colliders operating in the $e\gamma$ mode. In particular, we study the production mechanism $e + \gamma \rightarrow e \gamma \gamma \rightarrow e + H$, where one photon is generated via the laser backscattering mechanis...
1993-04-13
2009-10-22
[ "hep-ph" ]
O. J. P. Eboli, M. C. Gonzalez-Garcia and S. F. Novaes
hep-ph/9304250
Bounding the Photon Mass with Solar Probes
Proposed close-encounter solar probes (Vulcan and Solar Probe) are planned to have highly eccentric orbits, with a perihelion of about $4R_S$ and an inclination close to $90^\circ$ out of the plane of the ecliptic. We show this could allow at least an order-of-magnitude improvement in the present directly measured limi...
1993-04-13
2009-09-25
[ "hep-ph" ]
V. Alan Kosteleck\'y and Michael Martin Nieto
hep-ph/9304249
String-Based Perturbative Methods for Gauge Theories
Recent progress in the computation of one-loop gluon amplitudes is reviewed. These methods were originally derived from superstring theory and are significantly more efficient than conventional Feynman rules. With these methods, explicit computations can be performed beyond those achieved by traditional methods.
1993-04-13
2007-05-23
[ "hep-ph" ]
Zvi Bern
hep-ph/9304245
Metastability in Two Dimensions and the Effective Potential
We study analytically and numerically the decay of a metastable phase in (2+1)-dimensional classical scalar field theory coupled to a heat bath, which is equivalent to two-dimensional Euclidean quantum field theory at zero temperature. By a numerical simulation we obtain the nucleation barrier as a function of the para...
1993-04-12
2009-10-22
[ "hep-ph", "cond-mat", "hep-lat" ]
M. Alford and M. Gleiser
hep-ph/9304244
Is the World Supersymmetric? Do We Already Know?
In addition to the very good theoretical motivations for supersymmetry, there are now at least nine phenomenological indications that nature is supersymmetric. All are indirect, so more is better. They are enumerated here. Some discussion is also given of models, of when and where superpartners might be directly detect...
1993-04-12
2007-05-23
[ "hep-ph" ]
G.L. Kane
hep-ph/9304243
A Bargmann-Wightman-Wigner Type Quantum Field Theory
This version corrects an inportant typographical error in Eq. 17. COMMENTS, FOR THE RECORD: A referees reoprt from Phys. Rev. Lett. read in part ``The first named author has appreciated my exceptionally long report. He has read and well assimilated the literature I suggested. Congratulations! This very new version of t...
1993-04-10
2008-11-26
[ "hep-ph" ]
D. V. Ahluwalia, M. B. Johnson and T. Goldman
hep-ph/9304242
Origin of spontaneous violation of the Lorentz symmetry: Vortices in the cosmos
By carefully studying the (1,0)+(0,1) representation space for massive particles we point to the existence of certain inherent tachyonic dispersion relations: E^2= p^2-m^2. We put forward an interpretation that exploits these ``negative mass squared'' solutions; rotational invariance is spontaneously broken. Relevance ...
1993-04-10
2008-11-26
[ "hep-ph", "astro-ph" ]
D. V. Ahluwalia and T. Goldman
hep-ph/9304241
Re-Examination of Generation of Baryon and Lepton Number Asymmetries by Heavy Particle Decay
It is shown that wave function renormalization can introduce an important contribution to the generation of baryon and lepton number asymmetries by heavy particle decay. These terms, omitted in previous analyses, are of the same order of magnitude as the standard terms. A complete cancellation of leading terms can resu...
1993-04-09
2008-11-26
[ "hep-ph" ]
Jiang Liu and Gino Segre
hep-ph/9304238
Large Multiplicity Gluon Production in QCD
We compute the approximate cross section $\sigma_n^{(0)}$ for producing $n-2$ {\it resolved} gluons in a gluon-gluon collision, using the Parke-Taylor formula regularized in a Lorentz invariant manner. We find, in double leading logarithm approximation, that \[ \sigma_{n}^{(0)} \approx \frac{1}{s} \left( \frac{N_c\alph...
1993-04-08
2009-10-22
[ "hep-ph" ]
Haim Goldberg and Rogerio Rosenfeld
hep-ph/9304230
Reduced Effective Lagrangians
Effective Lagrangians, including those that are spontaneously broken, contain redundant terms. It is shown that the classical equations of motion may be used to simplify the effective Lagrangian, even when quantum loops are to be considered.
1993-04-08
2009-10-22
[ "hep-ph" ]
C. Arzt
hep-ph/9304234
On the Evaluation of Thermal Corrections to False Vacuum Decay Rates
We examine the computation of the nucleation barrier used in the expression for false vacuum decay rates in finite temperature field theory. By a detailed analysis of the determinantal prefactor, we show that the correct bounce solution used in the computation of the nucleation barrier should not include loop correctio...
1993-04-08
2009-10-22
[ "hep-ph" ]
M. Gleiser, G. C. Marques, and R. O. Ramos
hep-ph/9304235
SUSY signals at HERA in the no-scale flipped SU(5) supergravity model
Sparticle production and detection at HERA are studied within the recently proposed no-scale flipped $SU(5)$ supergravity model. Among the various reaction channels that could lead to sparticle production at HERA, only the following are within its limit of sensitivity in this model: $e^-p\to \tilde e^-_{L,R}\chi^0_i+X,...
1993-04-08
2009-08-25
[ "hep-ph" ]
J. Lopez, D. Nanopoulos, X. Wang, and A. Zichichi
hep-ph/9304239
Ratios of $W^\pm\gamma$ and $Z\gamma$ Cross Sections: New Tools in Probing the Weak Boson Sector at the Tevatron
The ratios ${\cal R}_{\gamma ,\ell}=B(Z\to\ell^+\ell^-)\cdot\sigma(Z\gamma) /\allowbreak B(W\to\ell\nu)\cdot\sigma(W^\pm\gamma)$, ${\cal R}_{\gamma , \nu}= B(Z\to\bar\nu\nu)\cdot\sigma(Z\gamma)/\allowbreak B(W\to\ell\nu)\cdot\sigma(W^ \pm\gamma)$, ${\cal R}_{W\gamma}=\sigma(W^\pm\gamma)/\allowbreak\sigma(W^\pm)$, and $...
1993-04-08
2009-10-22
[ "hep-ph" ]
U. Baur, S. Errede, and J. Ohnemus
hep-ph/9304233
Strongly Interacting W's and Z's and the Existence of a Heavy Fourth Generation of Fermions
By employing the dictum that axiomatic principles are devoid of predictive power, we find that the elastic unitarity constraint, applied to strong W$_L$W$_L$ scattering, does not alter the assumed spectrum of intermediate states. We consider intermediate states involving a heavy Higgs and heavy fermions of a hypothetic...
1993-04-08
2009-10-22
[ "hep-ph" ]
Silas R. Beane and Samir Varma
hep-ph/9304237
Measuring Charm and Bottom Quark Masses
The meaning and the extraction of heavy quark masses are discussed. A simple production model is presented which incorporates the running of the heavy quark mass into perturbative calculations. The model offers the possibilities of (i) understanding the differing charmed mass values extracted from different experiments...
1993-04-08
2007-05-23
[ "hep-ph" ]
Thomas J. Weiler and K. Ghafoori--Tabrizi
hep-ph/9304231
Phenomenology of Spin Zero Mesons and Glueballs
We discuss the phenomenology of scalar and pseudoscalar mesons, emphasizing those which do not carry manifest flavor quantum numbers. Many of the properties of these mesons are still not fully understood. Some of them probably do not have the usual two-quark (quark-antiquark) structure, but may be mixed with glueball s...
1993-04-08
2007-05-23
[ "hep-ph" ]
M. Genovese, D.B. Lichtemberg and E. Predazzi
hep-ph/9304236
Decoupling in Non-Perturbative Background Fields: the Thermal Sphaleron
Standard decoupling of heavy fermions may fail when there are non-perturbative variations in a scalar field which gives masses to the fermions. One situation of phenomenological relevance is the case of sphalerons in the presence of fermions at finite temperatures. The free energy of a simple model is determined using ...
1993-04-08
2010-11-01
[ "hep-ph", "hep-th" ]
Thomas M. Gould and I.Z. Rothstein
hep-ph/9304240
The Electroweak Chiral Lagrangian and New Precision Measurements
A revised and complete list of the electroweak chiral lagrangian operators up to dimension-four is provided. The connection of these operators to the $S$, $T$ and $U$ parameters and the parameters describing the triple gauge boson vertices $WW\gamma$ and $WWZ$ is made, and the size of these parameters from new heavy ph...
1993-04-08
2009-10-22
[ "hep-ph" ]
T. Appelquist and G. Wu
hep-ph/9304232
Quark correlation functions in deep inelastic semi-inclusive processes
We investigate one-particle semi-inclusive processes in lepton-hadron scattering. In unpolarized scattering order $Q^{-1}$ corrections appear only when transverse momenta are detected. We consider the twist two and three matrix elements and calculate the semi-inclusive structure functions in terms of quark correlation ...
1993-04-08
2009-12-15
[ "hep-ph" ]
J. Levelt and P.J. Mulders
hep-ph/9304227
Tau Polarimetry with Inclusive Decays
The spin asymmetry parameter $A_\tau$ characterizing the angular distribution of the total hadron momentum in the decay of a polarized tau can be calculated rigorously using perturbative QCD and the operator product expansion. Perturbative QCD corrections to the free quark result $A_\tau = 1/3$ can be expressed as a po...
1993-04-07
2009-10-22
[ "hep-ph" ]
Eric Braaten
hep-ph/9304228
Observing the Inflaton Potential
We show how observations of the density perturbation (scalar) spectrum and the gravitational wave (tensor) spectrum allow a reconstruction of the potential responsible for cosmological inflation. A complete functional reconstruction or a perturbative approximation about a single scale are possible; the suitability of e...
1993-04-07
2009-10-22
[ "hep-ph", "astro-ph", "gr-qc" ]
Edmund J. Copeland, Edward W. Kolb, Andrew R. Liddle, and James E. Lidsey
hep-ph/9304229
Constraints on Majoron Models, Neutrino Masses and Baryogenesis
We derive strong contraints on the Yukawa couplings and the vacuum expectation value in the singlet majoron model, taking into account the possibility of a small gravitationally induced mass for the majoron. If the present baryon asymmetry was created earlier than at the electroweak phase transition, then to preserve i...
1993-04-07
2009-09-15
[ "hep-ph" ]
James M. Cline, Kimmo Kainulainen and Keith A. Olive
hep-ph/9304226
Why a Scalar Explanation of the L3 Events is Implausible
We investigate the question of whether an additional light neutral scalar can explain the $l^+ l^- \gamma \gamma$ events with high invariant mass photon pairs recently observed by the L3 collaboration. We parameterize the low energy effects of the unknown dynamics in terms of higher dimensional effective operators. We ...
1993-04-06
2009-09-15
[ "hep-ph" ]
Lisa Randall and Nuria Rius
hep-ph/9304219
Parameter--free calculation of $D \rightarrow P P$ in a weak--gauged $U(4)_L \otimes U(4)_R$ Chiral Lagrangian Model
We analyze the decay modes of charmed mesons into two--pseudoscalars in a weak--gauged U(4)_L x U(4)_R chiral lagrangian model. The calculation is free of unknown parameters and only requires as inputs the masses of pseudoscalars and the decay constant of the pion. The general pattern of the results at leading order co...
1993-04-06
2009-10-22
[ "hep-ph" ]
F.J. Botella, S. Noguera, J. Portol\'es
hep-ph/9304222
Probes of Heavy Meson Substructure in $e^+ e^-$ annihilation
We apply Heavy Quark Effective Theory to the production of $0^-$ and $1^-$ $Q\bar{q}$ states in $e^+ e^-$ annihilation. We show that HQET implies that the electric quadrupole amplitudes vanish and we propose tests for this theory. We also show how HQET can be applied to distinguish the $^3D_1$ and $^3S_1$ $Q\bar{Q}$ st...
1993-04-06
2009-10-22
[ "hep-ph" ]
F.E.Close and G.J.Gounaris
hep-ph/9304221
The Process " Pbar P -> E- E+ " with Polarized Initial Particles and Proton Form Factors in Time-Like Region
The discussion on the asymptotical behaviour of the form factors in the space-like and time-like regions have been corrected and clarified. Fig.3 has been replaced by an improved analysis of the data.
1993-04-06
2010-11-15
[ "hep-ph" ]
S.M. Bilenky, C. Giunti and V. Wataghin
hep-ph/9304220
Electroweak Magnetism, W-condensation and Anti-Screening
We review how external magnetic fields act as perfect probes of the non-abelian nature of the electroweak theory.
1993-04-06
2007-05-23
[ "hep-ph", "hep-th" ]
Jan Ambjorn and Poul Olesen
hep-ph/9304223
Unified Universal Seesaw Models
A set of Grand Unified Theories based upon the gauge groups $SU(5)_\L \times SU(5)_\R$, $SO(10)_\L \times SO(10)_\R$ and $SU(4)_\C \times SU(4)_\L \times SU(4)_\R$ is explored. Several novel features distinguish these theories from the well-known $SU(5)$, $SO(10)$ and $SU(4)_\C \times SU(2)_\L \times SU(2)_\R$ models w...
1993-04-06
2008-11-26
[ "hep-ph" ]
Peter Cho
hep-ph/9304225
QCD Predictions for Lepton Spectra in Inclusive Heavy Flavour Decays
We derive the lepton spectrum in semileptonic beauty decays from a nonperturbative treatment of QCD; it is based on an expansion in $1/m_Q$ with $m_Q$ being the heavy flavour quark mass. The leading corrections arising on the $1/m_Q$ level are completely expressed in terms of the difference in the mass of the heavy had...
1993-04-06
2011-05-05
[ "hep-ph" ]
I.I.Bigi, M.Shifman, N.G.Uraltsev, A. Vainshtein
hep-ph/9304224
Top Quark and Charged Higgs: Linked by Radiative Corrections
Some aspects of the phenomenology of the top quark and the charged Higgs are studied, emphasizing relations due to radiative corrections. Production mechanisms at the SSC are mentioned, and decay modes are analyzed including radiative corrections to the charged Higgs mass and couplings. The constraints due to the decay...
1993-04-06
2007-05-23
[ "hep-ph" ]
Marco A. Diaz
hep-ph/9304218
Exact Supersymmetric Amplitude for \kkb\/ and \bbb\/ Mixing
We present the most general supersymmetric amplitude for \kkb\/ and \bbb\/ mixing resulting from gluino box diagrams. We use this amplitude to place general constraints on the magnitude of flavor-changing squark mass mixings, and compare these constraints to theoretical predictions both in and beyond the Minimal Supers...
1993-04-05
2010-11-01
[ "hep-ph" ]
John S. Hagelin, S. Kelley and Toshiaki Tanaka
hep-ph/9304211
New Bounds on Leptoquark Couplings
We derive new bounds on scalar leptoquark couplings from K^0 K^0 bar, D^0 D^0 bar and B^0 B^0 bar mixing. Although leptoquarks contribute to these processes only at one loop, their contribution is large, due to the lack of GIM cancelation. Our bounds have two important features: (i) They bound g^4/M^2, in contrast to t...
1993-04-05
2010-11-01
[ "hep-ph" ]
Miriam Leurer (Weizmann Institute)
hep-ph/9304216
Accurate Neutralino Relic Density Computations in Supergravity Models
We investigate the question of the proper thermal averaging of neutralino annihilation amplitudes which possess poles and thresholds, as they impact on the calculated neutralino relic density and therefore on the cosmological viability of supersymmetric models. We focus on two typical resonances, namely the $Z$ boson a...
1993-04-05
2009-10-22
[ "hep-ph" ]
J. Lopez, D. Nanopoulos, and K. Yuan
hep-ph/9304213
Phenomenological Description of an Unstable Fermion
We present a phenomenological description for an unstable fermion based upon one-loop renormalization of quantum field theory. It is emphasized that wave function renormalization can introduce important $CP$-conserving and $CP$-violating phases. Implications for the study of $CP$ violation are examined. Applications ar...
1993-04-05
2007-05-23
[ "hep-ph" ]
Jiang Liu
hep-ph/9304217
Static Properties of Quark Solitons
It has been conjectured that at distances smaller than the confinement scale but large enough to allow for nonperturbative effects, QCD is described by an effective $SU(N_c {\times} N_f)_L\times SU(N_c {\times} N_f)_R$ chiral Lagrangian. The soliton solutions of such a Lagrangian are extended objects with spin ${1\over...
1993-04-05
2009-10-22
[ "hep-ph" ]
Gonen Gomelski, Marek Karliner, and Stephen B. Selipsky
hep-ph/9304214
Skyrmions and Semilocal Strings in Cosmology
It has been pointed out that cosmic string solutions can exist in gauge field theories with broken symmetry even when $\pi _1(G/H)$ is trivial. The stability of such semilocal defects is not guaranteed by topology and depends on dynamical considerations. In the literature it has been tacitly assumed that if stable, suc...
1993-04-05
2009-10-22
[ "hep-ph", "hep-th" ]
Katherine Benson and Martin Bucher
hep-ph/9304215
Calculated Electron Fluxes at Airplane Altitudes
A precision measurement of atmospheric electron fluxes has been performed on a Japanese commercial airliner (Enomoto, {\it et al.}, 1991). We have performed a monte carlo calculation of the cosmic ray secondary electron fluxes expected in this experiment. The monte carlo uses the hadronic portion of our neutrino flux c...
1993-04-05
2009-12-30
[ "hep-ph", "astro-ph" ]
R.K. Schaefer, T.K. Gaisser, and T.S.Stanev
hep-ph/9304212
Decorated-box-diagram-contributions to Bhabha scattering. (I)
We evaluate, in the high-energy limit, $s\gg|t|\gg m^2\gg\lambda^2$, the sum of amplitudes corresponding to a class of Feynman diagrams describing two-loop virtual photonic corrections to Bhabha scattering. The diagrams considered are box and crossed box diagrams with an extra photon decorating one of the fermion lines...
1993-04-05
2009-10-22
[ "hep-ph" ]
G\"oran F\"aldt and Per Osland
hep-ph/9304210
Power Corrections to QCD Sum Rules for Compton Scattering
We extend previous work on sum rules for the invariant amplitudes of pion Compton scattering by deriving a complete lowest order perturbative spectral function - and its leading non perturbative power corr ections - for a specific combination of the two helicities $(H_1 + H_2)$ of this process. Using some properties of...
1993-04-04
2009-10-22
[ "hep-ph" ]
Claudio Coriano'
hep-ph/9304207
Heavy Top Quark Effects in Vertices with Light External Fermions
We extend our previous work on non-linear realization of the top quark field, which is a consequence of its being much heavier than any other scales. One loop effective Lagrangian to account for virtual top effects is constructed in this article, for processes where there are two external fermions, as well as any numbe...
1993-04-04
2009-10-22
[ "hep-ph" ]
G.-L. Lin, H. Steger and Y.-P. Yao
hep-ph/9304208
Integral correlation measures for multiparticle physics
We report on a considerable improvement in the technique of measuring multiparticle correlations via integrals over correlation functions. A modification of measures used in the characterization of chaotic dynamical sytems permits fast and flexible calculation of factorial moments and cumulants as well as their differe...
1993-04-03
2009-10-22
[ "hep-ph" ]
H.C. Eggers, P. Lipa, P. Carruthers and B. Buschbeck
hep-ph/9304209
Search for the intermediate Mass Higgs Signal at TeV $e\gamma$ colliders
The intermediate mass Higgs (IMH) can be abundantly produced through the process $e^-\gamma \rightarrow W^-H\nu$ at TeV $e^-\gamma$ colliders, which are realized by the laser back-scattering method. We search for the signature of $W^-H \rightarrow (jj)(b\bar b)$ plus missing transverse momentum, with and without consid...
1993-04-03
2009-10-22
[ "hep-ph" ]
Kingman Cheung
hep-ph/9304205
See-saw Enhancement of Lepton Mixing
The see-saw mechanism of neutrino mass generation may enhance lepton mixing up to maximal even if the Dirac mass matrices of leptons have structure similar to that in the quark sector. Two sets of conditions for such an enhancement are found. The first one includes the see-saw generation of heavy Majorana masses for ri...
1993-04-02
2009-10-22
[ "hep-ph" ]
Alexei Yu. Smirnov
hep-ph/9304204
From Kaon-Nuclear Interactions to Kaon Condensation
An effective chiral Lagrangian in heavy-fermion formalism whose parameters are constrained by kaon-nucleon and kaon-nuclear interactions next to the leading order in chiral expansion is used to describe kaon condensation in dense ``neutron star" matter. The critical density is found to be robust with respect to the par...
1993-04-02
2011-07-19
[ "hep-ph", "astro-ph", "nucl-th" ]
G.E. Brown, C.-H. Lee, M. Rho and V.Thorsson
hep-ph/9304206
Effective-Lagrangian approach to precision measurements: the anomalous magnetic moment of the muon
We investigate the use of effective Lagrangians to describe the effects on high-precision observables of physics beyond the Standard Model. Using the anomalous magnetic moment of the muon as an example, we detail the use of effective vertices in loop calculations. We then provide estimates of the sensitivity of new exp...
1993-04-02
2011-07-19
[ "hep-ph" ]
C. Arzt, M.B. Einhorn, and J. Wudka
hep-ph/9303324
R-Parity Violating SUSY Model
This is a phenomenological review of $R$ parity violating SUSY models, with particular emphasis on explicit $R$ parity violation.
1993-04-01
2009-10-22
[ "hep-ph" ]
D.P. Roy
hep-ph/9304201
Chiral Symmetry and Electroweak pi,K,eta Processes
Recently the development of chiral perturbation theory has allowed the generation of rigorous low-energy theorems for various hadronic processes based only on the chiral invariance of the underlying QCD Lagrangian. Herein we examine the experimental implications of chiral symmetry in the regime of electroweak Goldstone...
1993-04-01
2007-05-23
[ "hep-ph" ]
Barry R. Holstein
hep-ph/9304202
Isospin splitting in heavy baryons and mesons
A recent general analysis of light-baryon isospin splittings is updated and extended to charmed baryons. The measured $\Sigma_c$ and $\Xi_c$ splittings stand out as being difficult to understand in terms of two-body forces alone. We also discuss heavy-light mesons; though the framework here is necessarily less gene...
1993-04-01
2009-10-22
[ "hep-ph", "nucl-th" ]
R. E. Cutkosky and Paul Geiger
hep-ph/9304203
Baryogenesis, Domain Walls and the Role of Gravity
It has been recently speculated that global symmetries are broken by gravity. We propose a scenario for the generation of the baryon asymmetry in the early Universe in which the domain walls predicted by theories with discrete symmetries become unstable due to these Planck scale effects. The relative motion of the deca...
1993-04-01
2009-10-22
[ "hep-ph" ]
H. Lew and A. Riotto
hep-ph/9303325
Radiative Electroweak Parameters
The status of the present precision measurements of electroweak observables is reviewed with specific reference to the radiative parameters $S,T,U$ or equivalently $\epsilon_1,\epsilon_2,\epsilon_3$. The significance of the obliqueness hypothesis is underlined and the importance of the ``local fit'' method of extractin...
1993-04-01
2015-06-25
[ "hep-ph" ]
Probir Roy
hep-ph/9303322
Nullification of multi-Higgs threshold amplitudes in the Standard Model
We show that nullification of all tree-order threshold amplitudes involving Higgs particles in the Standard Model occurs, provided that certain equations relating the masses of all existing elementary particles to the mass of the Higgs scalar are satisfied. The possible role of these relations in restoring the high-mul...
1993-03-31
2009-10-22
[ "hep-ph" ]
E.N. Argyres, R. Kleiss and C.G. Papadopoulos
hep-ph/9303319
Self-mass for Massive Quark
We study the behavior of the self-mass for a quark with a current mass larger than $\Lambda_QCD$, as a function of its Euclidean momentum and mass, in QCD. An expression for the Bethe-Salpeter kernel of the Schwinger-Dyson (SD) equation valid in both the infrared and ultraviolet regions is obtained based on a renormali...
1993-03-31
2009-10-22
[ "hep-ph" ]
Zheng Huang and K.S. Viswanathan
hep-ph/9303323
Beyond the Standard Model with Effective Lagrangians
An Effective Lagrangian description is useful for describing potential physics beyond the Standard Model. The method is illustrated by reference to interactions among the electroweak bosons ($W^\pm$ \& $Z^0$). The resulting estimates of the magnitude of these corrections suggest that they would be at best marginally de...
1993-03-31
2008-02-03
[ "hep-ph" ]
Martin B. Einhorn (U. of Michigan)
hep-ph/9303321
Multiscalar amplitudes to all orders in perturbation theory
A method for calculating loop amplitudes at the multiboson threshold is presented, based on Feynman-diagram techniques. We explicitly calculate the one-loop amplitudes in both $\phi^4$-symmetric and broken symmetry cases, using dimensional regularization. We argue that, to all orders in the perturbation expansion, the ...
1993-03-31
2009-10-22
[ "hep-ph" ]
E.N. Argyres, Ronald H.P. Kleiss and Costas G. Papadopoulos
hep-ph/9303320
Stitching the Yukawa Quilt
We develop a systematic analysis of quark mass matrices which, starting with the measured values of quark masses and mixing angles, allows for a model independent search for all possible (symmetric or hermitian) mass matrices having texture zeroes at the unification scale. A survey of all six and five texture zero stru...
1993-03-31
2010-11-01
[ "hep-ph" ]
P. Ramond, R.G. Roberts, G.G. Ross
hep-ph/9303314
Gauge Invariance and Anomalous Dimensions of a Light-Cone Wilson Loop in Light-Like Axial Gauge
Complete two-loop calculation of a dimensionally regularized Wilson loop with light-like segments is performed in the light-like axial gauge with the Mandelstam-Leibbrandt prescription for the gluon propagator. We find an expression which {\it exactly} coincides with the one previously obtained for the same Wilson loop...
1993-03-30
2009-10-22
[ "hep-ph" ]
A.Bassetto, I.A.Korchemskaya, G.P.Korchemsky and G.Nardelli
hep-ph/9303315
Possible Implications of a Light Gluino
Light gluinos have been suggested in order to reconcile $\alpha_s$ determinations from low energy deep inelastic experiments with those inferred from LEP measurements. {}From this hypothesis then one expects, in unified N=1 supergravity models, that also the "photino" will be light. We show that this possibility is not...
1993-03-30
2007-05-23
[ "hep-ph" ]
F. de Campos and J. W. F. Valle