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hep-ph/9309326
Relation between $\sin^2\hat{\theta}_W(m_Z)$ and $\sin^2\theta_{eff}^{lep}$
The relation between $\sef$, frequently employed in LEP analyses, and the $\rm{\overline{MS}}$--parameter $\scr$ is discussed and their difference evaluated by means of an explicit calculation.
1993-09-27
2009-12-30
[ "hep-ph" ]
P. Gambino and A. Sirlin
hep-ph/9309325
New Physics Effects on CP Violation in $B$ Decays
We review new physics effects on CP violation in B decays. We describe the Standard Model predictions for the various types of CP asymmetries and discuss the theoretical cleanliness of these predictions. We point out the ingredients in the analysis that are most sensitive to new physics and deduce the type of new physi...
1993-09-26
2007-05-23
[ "hep-ph" ]
Yosef Nir
hep-ph/9309324
Vector boson Pair Production at Supercolliders; useful approximate helicity amplitudes
We study vector boson pair production at $LHC$ and $SSC$, taking into account the effects generated by the anomalous vector boson and Higgs couplings induced by the operators ${\cal O}_W$ and ${\cal O}_{UW}$, which are the only dim=6 operators preserving $SU(2)_c$. These operators lead to enhanced production of transve...
1993-09-25
2019-08-17
[ "hep-ph" ]
J. Layssac, F.M. Renard, G. Gounaris
hep-ph/9309323
On the Distribution of Neutral and Charged Pions through the Production of a Classical Pion Field
High energy reactions may produce a state around the collision point that is best described by a classical pion field. Such a field might be an isospin rotated vacuum of the chiral $\sigma$-model or, as discussed in this work, a solution of the equations of motion resultinng from the coupling of fields of this model to...
1993-09-24
2011-02-01
[ "hep-ph" ]
A. A. Anselm and Myron Bander
hep-ph/9309322
Probing Three-Boson Anomalous Couplings in $e^+e^-\to W^+W^-$ at Future Linear $e^+e^-$ Colliders with Polarized Beams
We study the potential of the next-generation $e^+ e^-$ linear colliders with longitudinally polarized beams, to restrict the values of the anomalous trilinear couplings $WW\gamma$ and $WWZ$ from the measurement of the process $e^+ e^-\to W^+ W^-$. Along with initial $e^+e^-$ polarization, we account also for the possi...
1993-09-24
2009-09-25
[ "hep-ph" ]
A.A.Likhoded, A.A.Pankov, N.Paver, M.V.Shevlyagin and O.P.Yushchenko
hep-ph/9309321
Chiral Lagrangian with higher resonances and flavour $ SU(3) $ breaking
A chiral Lagrangian with $ SU(3) $ breaking and higher resonances is proposed. In this model, the $ SU(3) $ breaking structure in vector-pseudoscalar sector is realized with the decay constants of pseudoscalar mesons and the masses of vector mesons used as inputs. We examine whether the resulting $ SU(3) $ breaking eff...
1993-09-24
2017-02-01
[ "hep-ph" ]
M.Hayakawa, T.Kurimoto and A.I.Sanda
hep-ph/9309320
Inhomogeneous Field Configurations and the Electroweak Phase Transition
We investigate the effects of inhomogeneous scalar field configurations on the electroweak phase transition. For this purpose we calculate the leading perturbative correction to the wave function correction term $Z(\vph,T)$, i.e., the kinetic term in the effective action, for the electroweak Standard Model at finite te...
1993-09-24
2009-10-22
[ "hep-ph" ]
Dirk-Uwe Jungnickel and Dirk Walliser
hep-ph/9309318
Electroweak Physics at Current Accelerators and the Supercollider
The activities of the Electroweak Physics Working Group are summarized. Three main issues are addressed: 1) prospects for measuring the $W$ mass at the Tevatron using the inclusive electron energy spectrum, 2) constraining the strange quark distribution function in $W$ + charm production, and 3) possibilities to determ...
1993-09-23
2007-05-23
[ "hep-ph" ]
U. Baur
hep-ph/9309319
Topics in String Phenomenology
We consider two questions in string ``phenomenology.'' First, are there any generic string predictions? Second, are there any general lessons which string theory suggests for thinking about low energy models, particularly in the framework of supersymmetry? Among the topics we consider are the squark and slepton spect...
1993-09-23
2007-05-23
[ "hep-ph" ]
Michael Dine
hep-ph/9309316
Stability of Neutrinos in the Singlet Majoron Model
We show that there is no one-loop enhancement of the rate for a light neutrino to decay into a lighter neutrino plus a majoron, contrary to a recent claim. Thus the light neutrinos must satisfy the cosmological bound of having masses less than 35 eV in the singlet majoron model, or else violate the constraint imposed b...
1993-09-23
2009-10-22
[ "hep-ph", "astro-ph" ]
James M. Cline, Kimmo Kainulainen and Sonia Paban
hep-ph/9309315
Summary of the Extensions of the Standard Model Working Group
We summarize the results of the extended gauge group working group of the Madison-Argonne Workshop on Present and Future Colliders. Contributions are described on the previously unexamined two photon fusion production of heavy leptons, new studies of $Z'$ couplings to $\nu \bar{\nu}$ and $q\bar{q}$, and previously unex...
1993-09-23
2007-05-23
[ "hep-ph" ]
Stephen Godfrey (Carleton University) and T. G. Rizzo (Argonne National Lab)
hep-ph/9309314
Pion Compton Scattering in Perturbative QCD
Pion Compton scattering is studied in perturbative QCD for real and space--like initial photons. Different methods for the convolution of the hard amplitude with the pion wave--functions, which have in the past led to conflicting results, are compared.
1993-09-23
2009-10-22
[ "hep-ph" ]
E. Maina and R. Torasso
hep-ph/9309313
New Supersymmetric Electroweak Gauge Model with Natural Baryon-Number Conservation
Baryon number (B) is automatically conserved in the standard SU(2) X U(1) electroweak gauge model, but not in its supersymmetric extension where it must be imposed as an extra condition. This undesirable feature is avoided in the conventional left-right supersymmetric extension, but then flavor-changing neutral current...
1993-09-23
2009-10-22
[ "hep-ph" ]
Ernest Ma
hep-ph/9309317
Physics of Polarized pp Collisions
I will summarize the physics that can be investigated with polarized pp collisions. It is technically feasible to use the RHIC collider for accelerating highly polarized protons to a center-of-mass energy of about 400 GeV, with high luminosity. Such collisions can be used to probe the spin-dependence of hard collisions...
1993-09-23
2007-05-23
[ "hep-ph" ]
John C. Collins
hep-ph/9309311
QCD improved estimates to rare B-Decays at the heavy b-quark limit
The renormalization effects from the b-quark scale down to the non-perturbative QCD regime are studied for rare $B$-decays at the heavy b-quark limit. Phenomenological consequences of these effects are investigated. We find that the anomalous scaling behavior plays a positive role in making non-perturbative model calcu...
1993-09-22
2007-05-23
[ "hep-ph" ]
Dongsheng Liu
hep-ph/9309312
Discrete Gauge Symmetries in Supersymmetric Grand Unified Models
We investigate the presence of discrete gauge symmetries in Grand Unification models based in $SO(10)$ and $E_6$. These models include {\it flipped} and {\it unflipped} $SU(5)$, $SU(4)\!\times\! SU(2)_L\!\times\! SU(2)_R$, $SU(3)_C\!\times\! SU(3)_L\!\times\! SU(3)_R$, and $SU(6)\!\times\! SU(2)$. Using the Dynkin form...
1993-09-22
2009-10-22
[ "hep-ph" ]
M. De Montigny (McGill Univ.) and M. Masip (Univ. of Florida)
hep-ph/9309310
Model independent constraints on leptoquarks from rare processes
We present model independent constraints on the masses and couplings to fermions of $B$ and $L$ conserving leptoquarks. Such vector or scalar particles could have masses below 100 GeV and be produced at HERA; we list the generation dependent bounds that can be calculated from rare lepton and meson decays, meson-anti-me...
1993-09-22
2008-11-26
[ "hep-ph" ]
Sacha Davidson, David Bailey, Bruce A. Campbell
hep-ph/9309303
Search for Flavoured Multiquarks in a Simple Bag Model
We use a bag model to study flavoured mesonic $(Qq\bar q\bar q)$ and baryonic $({\overline Q}qqqq)$ states, where one heavy quark $Q$ is associated with light quarks or antiquarks, and search for possible stable multiquarks. No bound state is found. However some states lie not too high above their dissociation threshol...
1993-09-21
2016-04-26
[ "hep-ph" ]
S. Zouzou (Universit\'e de Constantine, Alg\'erie) and J.-M. Richard (Institut des Sciences Nucl\'eaires, Grenoble)
hep-ph/9309300
Effective Lagrangian Approach to the Fermion Mass Problem
An effective theory is proposed, combining the standard gauge group $SU(3)_{C}\otimes SU(2)_{L}\otimes U(1)_{Y}$ with a horizontal discrete symmetry. By assigning appropriate charges under this discrete symmetry to the various fermion fields and to (at least) two Higgs doublets, the broad spread of the fermion mass and...
1993-09-21
2009-10-22
[ "hep-ph" ]
D. S. Shaw and R. R. Volkas
hep-ph/9309307
Oblique Corrections To The W Width
The lowest-order expression for the partial $W$ width to $e \nu ,~\Gamma (W \to e \nu) = G_\mu M_W^3 /(6 \pi \sqrt{2})$, has no oblique radiative corrections from new physics if the measured $W$ mass is used. Here $G_\mu = (1.16639 \pm 0.00002) \times 10^{-5}$ GeV/$c^2$ is the muon decay constant. For the present value...
1993-09-21
2009-10-22
[ "hep-ph" ]
Jonathan L. Rosner and Mihir P. Worah (Enrico Fermi Institute and Department of Physics, University of Chicago) and Tatsu Takeuchi (Fermilab)
hep-ph/9309304
Calculating the Bound on the Light Higgs Mass in General SUSY Models
In the Minimal Supersymmetric Standard Model (MSSM) the existence of an upper bound on the mass of the $CP=+1$ lightest Higgs boson, equal to $m_Z$ at tree--level and $\simlt 120\ GeV$ after the inclusion of radiative corrections, has important phenomenological consequences for Higgs searches. A similar bound, independ...
1993-09-21
2007-05-23
[ "hep-ph" ]
J.R.Espinosa
hep-ph/9309302
Order \alpha^4 R_{\infty} corrections to positronium P levels
The order $\alpha^4 R_{\infty}$ corrections to positronium $P$ levels are found. The calculation is reduced to the ordinary perturbation theory for the nonrelativistic Schr\"odinger equation. The perturbation operators have the Breit-type structure and are obtained by calculating on-mass-shell diagrams. Found energy co...
1993-09-21
2008-02-03
[ "hep-ph" ]
I.B. Khriplovich, A.I. Milstein, and A.S. Yelkhovsky
hep-ph/9309308
Observable Consequences of a Scalar Boson Coupled only to Neutrinos
We have examined the consequences of assuming the existence of a light scalar boson, weakly coupled to neutrinos, and not coupled to any other light fermions. For a range of parameters, we find that this hypothesis leads to the development of neutrino clusters which form in the early Universe and which provide gravitat...
1993-09-21
2007-05-23
[ "hep-ph", "astro-ph", "nucl-th" ]
G. J. Stephenson Jr. and T. Goldman
hep-ph/9309301
Resonant and Non-Resonant Pieces of the $D\rightarrow \bar{K}\pi$ Semileptonic Transition Amplitude
We compare the resonant and non-resonant contributions in various regions of phase space for the $D\rightarrow \bar{K}\p$ semileptonic transition amplitude, computed in a chiral model which incorporates the heavy quark symmetry. Remarks on the significance for experiment and for chiral perturbation theory are made. hep...
1993-09-21
2011-07-19
[ "hep-ph" ]
J. Schechter, A. Subbaraman and S. Surya
hep-ph/9309305
Bound State Soliton Description of Low Partial Wave Octet Baryon Resonances
A version of the bound state soliton model which allows both $\eta$ and $K$ bound states is used to study low partial wave octet baryon resonances. It is found that negative parity $S-$wave resonances are well described within this framework. A possible interpretation of the $P-$wave resonances is also discussed.
1993-09-21
2011-07-19
[ "hep-ph" ]
C. Gobbi and N.N. Scoccola
hep-ph/9309309
B--Physics in Hadron Colliders
The possibility of exploring the systematics of the spectroscopy, strong dynamics, and the weak and rare decay modes of b--quark systems at hadron colliders such as Fermilab, LHC and SSC, is discussed. A copious yield of $10^{10}$ detected $B$--mesons is readily accessible in a dedicated Fermilab program, and implies a...
1993-09-21
2016-10-26
[ "hep-ph" ]
Christopher T. Hill
hep-ph/9309306
More on Symmetries in Heavy Quark Effective Theory
We present a general classification of all normal and ``chiral" symmetries of heavy quark effective theories. Some peculiarities and conondrums associated with the ``chiral" symmetries are discussed.
1993-09-21
2009-10-22
[ "hep-ph" ]
Ashok Das and V. S. Mathur
hep-ph/9309292
The Central Temperature of the Sun can be Measured via the $^7$Be Solar Neutrino Line
A precise test of the theory of stellar evolution can be performed by measuring the difference in average energy between the neutrino line produced by ${\rm ^7Be}$ electron capture in the solar interior and the corresponding neutrino line produced in a terrestrial laboratory. The high temperatures in the center of the ...
1993-09-20
2009-10-22
[ "hep-ph", "astro-ph", "nucl-th" ]
John N. Bahcall
hep-ph/9309297
Effective Fermion Models in Symmetry-Breaking Phase and Quantum Chromodynamics
In our lecture we discuss the fermion models with quasilocal interaction implemented by derivatives and a momentum cutoff as substitutes of QCD at low energies. They are investigated in the strong coupling regime when several coupling constants are matched to their critical values. It is found that around polycritical ...
1993-09-20
2007-05-23
[ "hep-ph" ]
Alexandr Andrianov and Vladimir Andrianov
hep-ph/9309298
Electroweak gauge bosons self--energies: complete QCD corrections
We present the (two--loop) QCD corrections to the longitudinal and transverse components of the electroweak gauge bosons self--energies for arbitrary momentum transfer and for different internal quark masses. Compact formulae for both the real and imaginary parts are given in the general case as well as in some physica...
1993-09-20
2014-11-17
[ "hep-ph" ]
A. Djouadi and P. Gambino
hep-ph/9309296
The Effect of Supersymmetric Particles on b -> s \gamma Decay in Supergravity Models
The effect of loops involving charginos with up-type squarks, and gluinos with down-type squarks, on the inclusive decay mode $b\rightarrow s\gamma$ is studied in the context of minimal $N=1$ Supergravity models with a radiatively broken electroweak symmetry group. It is confirmed that the strong constraints imposed by...
1993-09-20
2007-05-23
[ "hep-ph" ]
Marco Aurelio Diaz
hep-ph/9309294
Higgs Bosons at the Fermilab Tevatron
The Wjj background has increased by 70%. This decreases the significance of the WH signal somewhat. The significance of the ZH signal remains about the same.
1993-09-20
2009-10-22
[ "hep-ph" ]
A. Stange, W. Marciano and S. Willenbrock
hep-ph/9309295
Violation Of The $\Delta I = 1/2$ Rule In $D \to \pi\pi$ Decays
A strong violation of the $\displaystyle{\Delta I = {1\over 2}} $ rule has experimentally been found in the $\displaystyle{D \to \pi\pi}$ decays [1]. In this letter we will show that the order of magnitude of this violation can be understood in terms of the pure quantum chromo dynamics corrections to the weak interacti...
1993-09-20
2009-10-22
[ "hep-ph" ]
Francesco Sannino
hep-ph/9309291
Theoretical Approaches to $B \to K^* \gamma$
We describe two recent theoretical calculations of the $B \to K^* \gamma$ decay. The first method is based on an effective lagrangian incorporating chiral symmetry for the light degrees of freedom and the heavy quark spin-flavor symmetries for the heavy quarks. Using these symmetries, together with the hypothesis of po...
1993-09-20
2007-05-23
[ "hep-ph" ]
G. Nardulli
hep-ph/9309299
R Symmetry Breaking Versus Supersymmetry Breaking
We point out a connection between R symmetry and \susy\ breaking. We show that the existence of an R symmetry is a necessary condition for \susy\ breaking and a spontaneously broken R symmetry is a sufficient condition provided two conditions are satisfied. These conditions are: {\it genericity}, \ie\ the effective Lag...
1993-09-20
2009-09-15
[ "hep-ph", "hep-th" ]
Ann E. Nelson and Nathan Seiberg
hep-ph/9309293
Infrared Fixed Point Solution for the Top Quark Mass and Unification of Couplings in the MSSM
We analyze the implications of the infrared quasi fixed point solution for the top quark mass in the Minimal Supersymmetric Standard Model. This solution could explain in a natural way the relatively large value of the top quark mass and, if confirmed experimentally, may be suggestive of the onset of nonperturbative ph...
1993-09-20
2008-11-26
[ "hep-ph" ]
W.A. Bardeen, M. Carena, S. Pokorski and C.E.M. Wagner
hep-ph/9309290
Large--order behavior of non--decoupling effects and triviality
We compute some non--decoupling effects in the standard model, such as the $\rho$ parameter, to all orders in the coupling constant expansion. We analyze their large order behavior and explicitly show how it is related to the non--perturbative cutoff dependence of these non--decoupling effects due to the triviality of ...
1993-09-20
2009-12-30
[ "hep-ph" ]
Kenichiro Aoki
hep-ph/9309289
Computing Quark and Gluon Distribution Functions for Very Large Nuclei
We argue that the distribution functions for quarks and gluons are computable at small x for sufficiently large nuclei, perhaps larger than can be physically realized. For such nuclei, we argue that weak coupling methods may be used. We show that the computation of the distribution functions can be recast as a many bod...
1993-09-19
2011-05-05
[ "hep-ph", "nucl-th" ]
Larry McLerran and Raju Venugopalan
hep-ph/9309288
New Bounds on Leptoquarks
We show that FCNC processes are unavoidable for leptoquarks that couple to left handed quarks, and derive new FCNC bounds from neutral meson mixing. Despite being induced only at one loop, these processes lead to significant bounds since the leptoquark contributions do not suffer from GIM cancellations. Studying the im...
1993-09-19
2007-05-23
[ "hep-ph" ]
Miriam Leurer (Weizmann Institute)
hep-ph/9309286
Can Stop be Light Enough ?
\def\nle{{\stackrel{<}{\sim}}} We examine a possibility for existence of a light supersymmetric partner of the top quark (stop) with mass 15 $\sim$ 20 GeV in the framework of the minimal supergravity GUT model. Such light stop could explain the slight excess of the high $p_{T}$ cross section of the $D^{*\pm}$-meson pro...
1993-09-18
2009-10-22
[ "hep-ph" ]
Tadashi Kon and Toshihiko Nonaka
hep-ph/9309287
Muonium Hyperfine Structure and the Decay $ \mu ^+\to e^+ +\overline \nu _e +\nu _{\mu}$ in Models with Dilepton Gauge Bosons
We examine the muonium ($\mu ^+e^-$)-antimuonium ($\mu ^-e^+$) system in the models which accomodate the dilepton gauge bosons, and study their contributions to the ground state hyperfine splitting in ``muonium''. We also consider the exotic muon decay $\mu ^+\to e^+ +\overline \nu _e +\nu _{\mu}$ mediated by the dilep...
1993-09-18
2010-11-01
[ "hep-ph" ]
H.Fujii, Y.Mimura, K.Sasaki and T.Sasaki
hep-ph/9309281
Threshold Effects And Perturbative Unification
We discuss the effect of the renormalization procedure in the computation of the unification point for running coupling constants. We explore the effects of threshold--crossing on the $\beta$--functions. We compute the running of the coupling constants of the Standard Model, between $m_Z$ and $M_P$, using a mass depend...
1993-09-17
2016-08-14
[ "hep-ph" ]
M. Bastero-Gil (1), V. Man\'ias (2), J. P\'erez-Mercader (1) ((1)Laboratorio de Astrof\'isica Espacial y F\'isica Fundamental, Madrid, Spain; (2) Departamento de F\'isica, Facultad de C. Exactas, UNLP C.C. 67, 1900 La Plata, Argentina)
hep-ph/9309284
Generalized Relativistic Meson Wave Function
We study the most general, relativistic, constituent $q{\overline q}$ meson wave function within a new covariant framework. We find that by including a tensor wave function component, a pure valence quark model is now capable of reproducing not only all static pion data ($f_\pi$, $\langle r_\pi^2 \rangle$) but also the...
1993-09-17
2009-10-22
[ "hep-ph" ]
A. Szczepaniak, C-R. Ji, and S. R. Cotanch
hep-ph/9309280
Scaling Violation in the Fragmentation Functions in e+e- Annihilation
A determination of the hadronic fragmentation functions of the Z-boson is presented from a study of the inclusive hadron production wit the DELPHI detector at LEP. These fragmentation functions were compared with the ones at lower energies, thus covering data in a large kinematic range: 196 <= Q^2 <= 8312 GeV^2 and x...
1993-09-17
2016-09-01
[ "hep-ph" ]
W. de Boer and T. Kussmaul, IEKP Karlsruhe
hep-ph/9309279
Light Quark Energy Distribution in Heavy Quark Symmetry
Using heavy quark symmetry we construct an energy sum rule relating the form factor of a heavy flavored meson $\xi(w)$ to the light quark energy distribution. We find that the current available data for $\xi(w)$ is consistent with a broad energy distribution rather than with that of a pure quark/anti-quark bound state,...
1993-09-17
2007-05-23
[ "hep-ph" ]
A. Szczepaniak, C-R. Ji, and S.R. Cotanch
hep-ph/9309278
An $O(3)$ Global Anomaly in 0+1 Dimension
We present a simple exactly solvable quantum mechanical example of the global anomaly in an $O(3)$ model with an odd number of fermionic triplets coupled to a gauge field on a circle. Because the fundamental group is non-trivial, $\pi_1 (O(3)) ={\bf Z}_2$, fermionic level crossing or circling occur in the eigenvalue sp...
1993-09-17
2019-08-17
[ "hep-ph" ]
Minos Axenides, Andrei Johansen and Holger Bech Nielsen
hep-ph/9309283
Determining the Penguin Effect on CP Violation in $B^0 \rightarrow \pi^+ \pi^-$
A major goal in B physics is measuring the CP-violating asymmetry in the decay $B^0 \rightarrow \pi^+ \pi^-$. In order to determine one of the phase angles in the CKM matrix from this decay it is necessary to determine the influence of the penguin amplitude. Here we show how, using $SU(3)$ symmetry, the penguin effect ...
1993-09-17
2010-01-06
[ "hep-ph" ]
Joao P. Silva and L. Wolfenstein
hep-ph/9309285
Evidence for Color Fluctuations in Hadrons from Coherent Nuclear Diffraction}
A QCD-based treatment of projectile size fluctuations is used to compute inelastic diffractive cross sections $\sigma_{diff}$ for coherent hadron-nuclear processes. We find that fluctuations near the average size give the major contribution to the cross section with $ \le few \%$ contribution from small size configurat...
1993-09-17
2009-10-22
[ "hep-ph", "nucl-th" ]
L. Frankfurt (Tel Aviv University, Ramat Aviv, Israe)l, G.A. Miller (Department of Physics, FM-15, University of Washington, Seattle, Washington, USA) and M. Strikman (Department of Physics, Pennsylvania State University, University Park, PA, USA)
hep-ph/9309282
Covariant Variable Front Quark Model
We study the implications of Lorentz symmetry for hadronic structure by formulating a manifestly covariant constituent quark model and find full covariance for any Lorentz transformation requires utilizing a variable quantization surface. Even though time-reversal invariance mandates a unique orientation for the surfac...
1993-09-17
2007-05-23
[ "hep-ph" ]
A. Szczepaniak, C-R. Ji, and S.R. Cotanch
hep-ph/9309276
Pion Form Factors at Intermediate Momentum Transfer in a Covariant Approach
We study the pion electromagnetic and $\gamma^* + \pi^0 \to \gamma$ transition form factors at intermediate momentum transfer. We calculate soft, nonperturbative corrections to the leading perturbative amplitudes which arise from the $q\bar q$-component of the pion wave function. We work in Minkowski space and use a Lo...
1993-09-16
2010-03-04
[ "hep-ph" ]
A. Szczepaniak and A.G. Williams
hep-ph/9309273
Is Heavy Quark Axion Necessarily Hadronic Axion?
We show that heavy quark axion is not necessarily a hadronic axion, which manifests in the quark and lepton seesaw mechanism. We introduce a heavy $SU(2)$ singlet fermion for each known fermion in order to unify the axion scale and the seesaw scale. The light quarks and leptons gain their masses by the seesaw mechanism...
1993-09-16
2009-12-30
[ "hep-ph" ]
Sanghyeon Chang and Jihn E. Kim
hep-ph/9309277
Supersymmetry and Supergravity: Phenomenology and Grand Unification
A survey is given of supersymmetry and supergravity and their phenomenology. Some of the topics discussed are the basic ideas of global supersymmetry, the minimal supersymmetric Standard Model (MSSM) and its phenomenology, the basic ideas of local supersymmetry (supergravity), grand unification, supersymmetry breaking ...
1993-09-16
2007-05-23
[ "hep-ph" ]
R. Arnowitt and Pran Nath
hep-ph/9309274
Fermion Doubling and a Natural Solution of the Strong CP Problem
We suggest the fermion doubling for all quarks and leptons. It is a generalization of the neutrino doubling of the seesaw mechanism. The new quarks and leptons are $SU(2)$ singlets and carry the electromagnetic charges of their lighter counterparts. An $SU(3)$ {\it anomaly free global symmetry} or a discrete symmetry c...
1993-09-16
2010-11-01
[ "hep-ph" ]
Sanghyeon Chang and Jihn E. Kim
hep-ph/9309275
The $\tau$ neutrino as a Majorana particle
A Majorana mass term for the $\tau$ neutrino would induce neutrino - antineutrino mixing and thereby a process which violates fermion number by two units. We study the possibility of distinguishing between a massive Majorana and a Dirac $\tau$ neutrino, by measuring fermion number violating processes in a deep inelasti...
1993-09-16
2008-11-26
[ "hep-ph" ]
M. Carena, B. Lampe and C.E.M. Wagner
hep-ph/9309270
Subleading Heavy Quark Effects in a Nonrelativistic Quark Model
I present a very simple model, based on the model of Isgur, Scora, Grinstein and Wise \cite{ISGW}, which can be used to calculate the effects which appear at subleading order in heavy quark effective theory. I include both general formalism and specific results. The formalism transparently reproduces the results of hea...
1993-09-15
2009-10-22
[ "hep-ph" ]
James F. Amundson
hep-ph/9309272
The Decay $B\to\pi\ell\nu$ in Heavy Quark Effective Theory
We present a systematic analysis of the $B^{(*)}\to\pi\,\ell\,\nu$ weak decay form factors to order $1/m_b$ in the heavy quark effective theory, including a discussion of renormalization group effects. These processes are described by a set of ten universal functions (two at leading order, and eight at order $1/m_b$), ...
1993-09-15
2010-11-01
[ "hep-ph" ]
Gustavo Burdman, Zoltan Ligeti, Matthias Neubert, and Yosef Nir
hep-ph/9309269
Effective Lagrangian Approach to Electroweak Baryogenesis: Higgs mass limit and Electric dipole moments of fermion
A natural solution to the hierachy problem of the standard model is to assume new physics to appear at the TeV scale. We parametrize the effects of this new physics in terms of an effective lagrangian and examine its impacts on electroweak baryogenesis. We point out that with such an effective lagrangian successful ele...
1993-09-15
2009-10-22
[ "hep-ph" ]
X. Zhang and B.-L. Young
hep-ph/9309264
Criticality, Fractality and Intermittency in Strong Interactions
Assuming a second-order phase transition for the hadronization process, we attempt to associate intermittency patterns in high-energy hadronic collisions to fractal structures in configuration space and corresponding intermittency indices to the isothermal critical exponent at the transition temperature. In this approa...
1993-09-15
2009-10-22
[ "hep-ph" ]
N.G.Antoniou, F.K.Diakonos, I.S.Mistakidis and C.G.Papadopoulos
hep-ph/9309271
Review of Z' Physics at Future Colliders
We present recent developments in the diagnostic study of heavy gauge bosons at future colliders with the emphasis on the determination of gauge couplings of $Z'$ to quarks and leptons. Proposed diagnostic probes at future hadron colliders are discussed. The study of statistical uncertainties expected for the above pro...
1993-09-15
2007-05-23
[ "hep-ph" ]
M. Cvetic, F. del Aguila, and P. Langacker
hep-ph/9309268
The standard model at low energies
The hadronic sector of the standard model at low energies is described by a non--decoupling effective field theory, chiral perturbation theory. An introduction is given to the construction of effective chiral Lagrangians, both in the purely mesonic sector and with inclusion of baryons. The connection between the relati...
1993-09-15
2011-04-15
[ "hep-ph" ]
G. Ecker
hep-ph/9309267
Relativistic Two-Body Bound-State Calculations Beyond the Ladder Approximation
In this work the Feynman-Schwinger representation for the two-body Greens function is studied. After having given a brief introduction to the formalism, we report on the first calculations based on this formalism. In order to demonstrate the validity of the method, we consider the static case where the mass of one of t...
1993-09-15
2007-05-23
[ "hep-ph" ]
Taco Nieuwenhuis, J. A. Tjon and Yu. A. Simonov
hep-ph/9309265
Quark and Pole Models of Nonleptonic Decays of Charmed Baryons
Quark and pole models of nonleptonic decays of charmed baryons are analysed from the point of view of their symmetry properties. The symmetry structure of the parity conserving amplitudes that corresponds to the contribution of the ground-state intermediate baryons is shown to differ from the one hitherto employed in t...
1993-09-15
2009-10-22
[ "hep-ph" ]
P.Zenczykowski
hep-ph/9309266
A Comprehensive Study of Leptoquark Bounds
We make a comprehensive study of indirect bounds on scalar leptoquarks that couple chirally and diagonally to the first generation by examining available data from low energy experiments as well as from high energy e+ e- and p pbar accelerators. The strongest bounds turn out to arise from low energy data: For leptoquar...
1993-09-15
2008-11-26
[ "hep-ph" ]
Miriam Leurer (Weizmann Institute)
hep-ph/9309260
Leptonic Decay Constants of Charm and Beauty Mesons in QCD: An Update
An update is given of the determination of leptonic decay constants of charm and beauty mesons in the framework of relativistic Hilbert moments and Laplace transform QCD sum rules.
1993-09-14
2007-05-23
[ "hep-ph" ]
C. A. Dominguez
hep-ph/9309262
Making the small oblique parameters large
We compute the oblique parameters, including the three new parameters $ V $, $ W $ and $ X $ introduced recently by the Montreal group, for the case of one scalar multiplet of arbitrary weak isospin $ J $ and weak hypercharge $ Y $. We show that, when the masses of the heaviest and lightest components of the multiplet ...
1993-09-14
2009-10-22
[ "hep-ph" ]
L. Lavoura and Ling-Fong Li
hep-ph/9309263
Dynamical chiral symmetry breaking and confinement with an infrared-vanishing gluon propagator?
We study a model Dyson-Schwinger equation for the quark propagator closed using an {\it Ansatz} for the gluon propagator of the form \mbox{$D(q) \sim q^2/[(q^2)^2 + b^4]$} and two {\it Ans\"{a}tze} for the quark-gluon vertex: the minimal Ball-Chiu and the modified form suggested by Curtis and Pennington. Using the quar...
1993-09-14
2010-03-04
[ "hep-ph", "nucl-th" ]
Frederick T. Hawes, Craig D. Roberts and Anthony G. Williams
hep-ph/9309259
Phenomenology of Multi-W Processes in Cosmic Rays
We report on a study of the potential of various cosmic ray physics experiments to search for Standard Model processes involving the nonperturbative production of O(30) weak gauge bosons. Whereas present and near-future experiments are insensitive to proton-induced processes, neutrino-induced processes give rise to pro...
1993-09-14
2007-05-23
[ "hep-ph" ]
D.A. Morris and A. Ringwald
hep-ph/9309261
Existence of Double Vortex Solutions
We show analytically and numerically the existence of double vortex solutions in two-Higgs systems. These solutions are generalizations of the \no vortices and exist for all values of the parameters in the Lagrangians considered. We derive analytically the asymptotic behavior of the solutions and confirm it numerical...
1993-09-14
2009-10-22
[ "hep-ph", "astro-ph" ]
Leandros Perivolaropoulos (Harvard-Smithsonian CfA)
hep-ph/9309258
Planck-Scale Unification and Dynamical Symmetry Breaking
We explore the possibility of unification of gauge couplings near the Planck scale in models of extended technicolor. We observe that models of the form G X SU(3)_c X SU(2)_L X U(1)_Y cannot be realized, due to the presence of massless neutral Goldstone bosons (axions) and light charged pseudo-Goldstone bosons; thus, u...
1993-09-13
2013-11-13
[ "hep-ph" ]
Joseph D. Lykken and Scott Willenbrock
hep-ph/9309257
High Temperature Phase Transitions without Infrared Divergences
Resubmitted due to LATEXing problems
1993-09-13
2011-04-15
[ "hep-ph" ]
N. Tetradis and C. Wetterich
hep-ph/9309256
Star Integrals and Unbiased Estimators
We review in brief the development and implementation of the Star integral, a tool yielding measurements of correlations much superior to conventional methods. A version for use in pion interferometry is explained. We also show how effects of non-poissonian overall multiplicity distributions may be eliminated if desire...
1993-09-12
2007-05-23
[ "hep-ph" ]
H.C. Eggers and P. Lipa
hep-ph/9309255
Photoproduction Cross Sections at HERA Energies
We show that photoproduction cross sections recently measured by ZEUS and H-1 at HERA energies$^1$ are in agreement with our earlier prediction based on high-energy hadronic structure of the photon in the QCD minijet-type model$^2$. We present results of an improved calculation of the photoproduction cross section, in ...
1993-09-11
2007-05-23
[ "hep-ph" ]
L. Durand, K. Honjo, R. Gandhi, H. Pi and I. Sarcevic
hep-ph/9309254
On-shell Supersymmetry Anomalies and the Spontaneous Breaking of Gauge Symmetry
A search for supersymmetry anomalies requires an examination of the BRS cohomology of supersymmetric Yang-Mills coupled to chiral matter, and the physically interesting (on-shell) anomalies are those which cannot be eliminated using the equations of motion. An analysis of this cohomology problem shows that the simplest...
1993-09-10
2007-05-23
[ "hep-ph", "hep-th" ]
J. A. Dixon
hep-ph/9309252
Testing Supergravity Grand Unification at Future Accelerator and Underground Experiments
The full parameter space of supergravity grand unified theory with $SU(5)$ type $p \rightarrow \bar{\nu} K$ proton decay is analysed using renormalization group induced electroweak symmetry breaking under the restrictions that the universal scalar mass $m_o$ and gluino mass are $\leq 1$ TeV (no extreme fine tuning) and...
1993-09-10
2008-11-26
[ "hep-ph" ]
R. Arnowitt and Pran Nath
hep-ph/9309253
Braaten-Pisarski Action, Disoriented Chiral Condensate, and Chiral Symmetry Non-Restoration
The QCD effective action at high T shows a manifest global chiral symmetry. And calculations show that the order parameter \psibarpsi vanishes above T_c. It has been popular to refer to this T_c as chiral symmetry restoration temperature because it fits into our prejudice that chiral symmetry is like an `ordered' state...
1993-09-10
2007-05-23
[ "hep-ph" ]
Ngee-Pong Chang
hep-ph/9309250
Collider Physics 1993
These lectures survey the present situation and future prospects in selected areas of particle physics phenomenology: (1) the top quark, (2) the Higgs boson in the Standard Model, (3) strong $WW$ scattering, (4) supersymmetry, (5) the Higgs sector in minimal supersymmetry, and (6) low-energy constraints on supersymmetr...
1993-09-09
2007-05-23
[ "hep-ph" ]
V.Barger and R.J.N.Phillips
hep-ph/9309251
Zeroing in on more photons and gluons
We discuss radiation zeros that are found in gauge tree amplitudes for processes involving multi-photon emission. Previous results are clarified by examples and by further elaboration. The conditions under which such amplitude zeros occur are identical in form to those for the single-photon zeros, and all radiated phot...
1993-09-09
2009-10-22
[ "hep-ph" ]
R.W.Brown, M.E.Convery, M.A.Samuel
hep-ph/9309249
A Solution to the Small Phase Problem of Supersymmetry
It is a well--known problem that in supersymmetric models there are new CP--violating phases which, if unsuppressed, would give a neutron electric dipole moment $10^2$ to $10^3$ times the present experimental limit. Here we propose that these new phases are suppressed by CP invariance, which is broken spontaneously at ...
1993-09-09
2010-11-01
[ "hep-ph" ]
K.S. Babu and S.M. Barr
hep-ph/9309248
Probing the Scalar Sector in $e^+ e^- \rightarrow f \bar{f} H$
We study possible deviations from the Standard Model in the reaction $e^+e^- \to Z\phi$, where $\phi$ denotes a spinless neutral boson. We show how the $Z$ decay angular correlation can be used to extract detailed information on the $\phi$ couplings, such as the parity of $\phi$, radiatively induced form factor effects...
1993-09-09
2008-11-26
[ "hep-ph" ]
K.Hagiawara and M.L.Stong
hep-ph/9309246
Light Gluinos in Four-Jet Events at LEP
The light gluino hypothesis can explain the apparent incompatibility between the measurements of $\as$ at low- and high-energy. Such gluinos are produced directlyin four-jet events, for which we perform a detailed analysis. Because the jet energies are not large, the effect of the non-zero gluino mass is important. We ...
1993-09-09
2009-10-22
[ "hep-ph" ]
R. Mu\~noz-Tapia and W.J. Stirling
hep-ph/9309247
Annihilation Diagrams in Two-Body Nonleptonic Decays of Charmed Mesons
In the pole-dominance model for the two-body nonleptonic decays of charmed mesons $D \rightarrow PV$ and $D \rightarrow VV$, it is shown that the contributions of the intermediate pseudoscalar and the axial-vector meson poles cancel each other in the annihilation diagrams in the chiral limit. In the same limit, the ann...
1993-09-09
2008-11-26
[ "hep-ph" ]
P. Bedaque, A. Das and V. S. Mathur
hep-ph/9309242
Bubble Growth as a Detonation
Bubble growth as a detonation is studied in the context of cosmological phase transitions. It is proved that the so called Chapman-Jouguet hypothesis, which restricts the types of detonations that can occur in spherically symmetric chemical burning, does not hold in the case of phase transitions. Therefore a much large...
1993-09-08
2009-10-22
[ "hep-ph" ]
M. Laine
hep-ph/9309245
Two-loop renormalization group analysis of hadronic decays of a charged Higgs boson
We calculate next-to-leading QCD corrections to the decay $H^+ \to u\bar d$ for generic up and down quarks in the final state. A recently developed algorithm for evaluation of massive two-loop Feynman diagrams is employed to calculate renormalization constants of the charged Higgs boson. The origin and summation of lar...
1993-09-08
2016-09-01
[ "hep-ph" ]
Andrzej Czarnecki and Andrei I. Davydychev
hep-ph/9309241
$b \rightarrow s \gamma$ and $Z \rightarrow b \overline b$ Constraints on Two Higgs Doublet Model
We perform a combined analysis of two stringent constraints on two Higgs doublet model, coming from the recently announced CLEO II bound on $B(b \rightarrow s \gamma)$ and $Z \rightarrow b \overline b$ and from the recent LEP data on the ratio $\Gamma(Z\rightarrow b\overline b)\over{\Gamma(Z\rightarrow hadrons)}$. We i...
1993-09-08
2009-10-22
[ "hep-ph" ]
Gye T. Park
hep-ph/9309244
THE $t\bar t\gamma$ BACKGROUND TO $pp\rightarrow W\gamma + X$ AT THE SSC
We calculate the $pp\rightarrow t\bar t\gamma+X\rightarrow W\gamma + X$ cross section at SSC energies. Approximately 40\% of the total cross section originates from photon bremsstrahlung off the final state jet in $t\bar tj$ production. Without cuts restricting the hadronic activity, the $t\bar t\gamma$ rate is a facto...
1993-09-08
2007-05-23
[ "hep-ph" ]
U. Baur and A. Stange
hep-ph/9309243
Single Leptoquark Production
The single production of leptoquarks in $e^+e^-$, $e\gamma$ and $\gamma \gamma$ linear colliders is discussed. We show that these new particles could be seen in such machines even if their mass is close to the kinematic limit. (Invited talk given by G.B. at the ``Workshop on Physics and Experiments at Linear $e^+e^-$ C...
1993-09-08
2009-09-25
[ "hep-ph" ]
G. Belanger, D. London and H. Nadeau
hep-ph/9309233
Effects of new physics to the the $\rho$--parameter in the supersymmetric standard model
The contribution to the $\rho$--parameter of the quark--Higgs sector of the supersymmetric standard model is computed non--perturbatively using the large--$\nf$ expansion for the case tan$\beta$=0. An explicit formula is found for the $\rho$--parameter which is ill-defined unless the triviality cutoff is taken into acc...
1993-09-07
2015-06-25
[ "hep-ph" ]
Kenichiro Aoki
hep-ph/9309239
Signals of Unconventional E$_6$ Models at $e^+e^-$ Colliders
Generation dependent discrete symmetries often appear in models derived from superstring theories. In particular, in the framework of E$_6$ models the presence of such symmetries is required in order to allow for the radiative generation of naturally small neutrino masses. Recently it was shown that by imposing suitabl...
1993-09-07
2009-10-22
[ "hep-ph" ]
Enrico Nardi
hep-ph/9309236
On The Dimensional Methods in Rare b Decays
Since several years there exists a question whether the dimensional reduction and the usual dimensional regularization give different results for the QCD-improved $b \rightarrow s \gamma$ and $b \rightarrow s$ $gluon$ decay rates. Here it is demonstrated explicitly that this is not the case: As long as physically meani...
1993-09-07
2009-10-22
[ "hep-ph" ]
Mikolaj Misiak
hep-ph/9309240
Approximate Flavor Symmetries in the Lepton Sector
Approximate flavor symmetries in the quark sector have been used as a handle on physics beyond the Standard Model. Due to the great interest in neutrino masses and mixings and the wealth of existing and proposed neutrino experiments it is important to extend this analysis to the leptonic sector. We show that in the see...
1993-09-07
2016-08-14
[ "hep-ph" ]
Andrija Ra\v{s}in and Jo\~ao P. Silva
hep-ph/9309232
Direct Instantons in QCD Nucleon Sum Rules
We study the role of direct (i.e. small-scale) instantons in QCD correlation functions for the nucleon. They generate sizeable, nonperturbative corrections to the conventional operator product expansion, which improve the quality of both QCD nucleon sum rules and cure the long-standing stability problem, in particular,...
1993-09-07
2009-10-22
[ "hep-ph" ]
Hilmar Forkel and Manoj K. Banerjee
hep-ph/9309235
Observing Disoriented Chiral Condensates
We speculate that, in very high energy hadronic collisions, large fireballs may be produced with interiors which have anomalous chiral order parameters. Such a process would result in radiation of pions with distinctive momentum and isospin distributions, and may provide an explanation of Centauro and related phenomena...
1993-09-07
2009-09-25
[ "hep-ph" ]
J.D. Bjorken, K.L. Kowalski and C.C. Taylor
hep-ph/9309234
How suppressed are the radiative interference effects in heavy unstable particle production?
We present a \lq\lq theorem" which quantifies, for inclusive processes, the level of suppression of the radiative interference effects between the production and decay stages of heavy {\it unstable} particles. The theorem, which is based on very general physical arguments, is applicable to all orders in the coupling.
1993-09-07
2009-10-22
[ "hep-ph" ]
V.S. Fadin, V.A. Khoze and A.D. Martin
hep-ph/9309238
Dynamics of Cosmological Phase Transitions
The dynamics of typical phase transitions is studied out of equilibrium in weakly coupled inflaton-type scalar field theories in Minkowski space. The shortcomings of the effective potential and equilibrium descriptions are pointed out. A case of a rapid supercooling from $T_i>T_c$ to $T_f \ll T_c$ is considered. The ...
1993-09-07
2007-05-23
[ "hep-ph" ]
D. Boyanovsky, H. J. de Vega and R. Holman
hep-ph/9309237
Catalyzed decay of false vacuum in four dimensions
The probability of destruction of a metastable vacuum state by the field of a highly virtual particle with energy $E$ is calculated for a (3+1) dimensional theory in the leading WKB approximation in the thin-wall limit. It is found that the induced nucleation rate of bubbles, capable of expansion, is exponentially smal...
1993-09-07
2009-10-22
[ "hep-ph" ]
M.B. Voloshin
hep-ph/9309228
Constraints on the anomalous $WW\gamma$ couplings from $b\rightarrow s\gamma$
We study contributions to $b \rightarrow s \gamma$ from anomalous $WW\gamma$ interactions. Although these anomalous interactions are not renormalizable, the contributions are cut-off independent. Using recent results from the CLEO collaboration on inclusive radiative B decays, we obtain bounds for the anomalous CP cons...
1993-09-06
2010-11-01
[ "hep-ph" ]
Xiao-Gang He and B. McKellar
hep-ph/9309231
Effects of Amplitude Nullification in the Standard Model
Delicate cancellations among diagrams can result in the vanishing of threshold amplitudes in the standard model. This phenomenon is investigated for multi-Higgs production by scalar, vector, and fermionic fields. A surprising gap is found where although the tree-level amplitude for $2$ incoming gauge bosons to produce ...
1993-09-06
2009-10-22
[ "hep-ph" ]
Brian Hendee Smith
hep-ph/9309229
The Low-Energy Theorem of Pion Photoproduction in Soliton Models of the Nucleon
We derive an analytic expression for the Kroll-Ruderman amplitude up to the order 1/N_C for general Skyrme-type models of the nucleon. Due to the degeneracy of intermediate N- and Delta-states we find deviations from the standard low-energy theorem for the photoproduction of neutral pions.
1993-09-06
2009-10-22
[ "hep-ph" ]
B. Schwesinger and H. Walliser
hep-ph/9309230
Semileptonic Decays and CKM Matrix Elements in a TCF
We argue that a Tau-Charm factory (TCF) could improve our knowledge of CKM matrix elements since it is an incomparable tool to check the models and methods applied to extract $V_{bu}$ from $B$ decay partial widths. We report on some recent proposals to improve on parton model. Turning to exclusive decays, we compare ...
1993-09-06
2007-05-23
[ "hep-ph" ]
A.Le Yaouanc and O.P\`ene
hep-ph/9309227
Measuring Three Vector Boson Couplings in $qq\to qqW$ at the SSC
We investigate the electroweak process $qq\to qqW$, {\it i.e.} $W$ production via $W\gamma$ and $WZ$ fusion, as a probe for nonstandard $WW\gamma$ and $WWZ$ vertices at hadron supercolliders. Triggering on events with one very forward and one very backward jet while requiring the $W$ decay lepton to be central, strongl...
1993-09-04
2007-05-23
[ "hep-ph" ]
U. Baur and D. Zeppenfeld