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Showing 2001 · hep-phShow all

35 papers · 2 filters

hep-ph2001★ 7 cited

Infrared Quasi Fixed Point Structure in Extended Yukawa Sectors and Application to R-parity Violation

Y. Mambrini, G. Moultaka

We investigate one-loop renormalization group evolutions of extended sectors of Yukawa type couplings. It is shown that Landau Poles which usually provide necessary low energy uppe…

hep-ph2001★ 58 cited

Neutrino masses and mixings in the MSSM with soft bilinear violation

Asmaa Abada, Sacha Davidson, Marta Losada

We analyse a simple RPV extension of the MSSM, with bilinear R-parity violation in the soft terms and vevs, but not between the terms in the superpotential. The model gives two mas…

hep-ph2001★ 1 cited

QCD Finite Energy Sum Rules and the Isoscalar Scalar Mesons

S. N. Cherry, M. R. Pennington

We apply QCD Finite Energy Sum Rules to the scalar-isoscalar current to determine the lightest meson in this channel. We use `pinch-weights' to improve the…

hep-ph2001★ 18 cited

Probing colored glass via photoproduction II: diffraction

F. Gelis, A. Peshier

In this paper, we consider the diffractive photoproduction of quark-antiquark pairs in peripheral heavy ion collisions. The color field of the nuclei is treated within the Colored…

hep-ph2001

Remarks on sum rules in the heavy quark limit of QCD

A. Le Yaouanc, L. Oliver, O. Pene +2

We underline a problem existing in the heavy quark limit of QCD concerning the rates of semileptonic B decays into P-wave mesons, where (wide states) or…

hep-ph2001

Structure functions at large x

Zhiqing Zhang

Structure function data together with other measurements from fixed-target deep inelastic scattering and hadron-hadron collider experiments which contribute to our knowledge of the…

hep-ph2001★ 2 cited

Tau and Charm physics highlights

P. Roudeau

In tau physics, we are at the frontier between the completion of the LEP program and the start of analyses from b-factories, which are expected to produce results in the coming yea…

hep-ph2001★ 16 cited

Brane Gas Inflation

M. F. Parry, D. A. Steer

We consider the brane gas picture of the early universe. At later stages, when there are no winding modes and the background is free to expand, we show that a moving 3-brane, which…

hep-ph2001★ 35 cited

Gravity Wave and Neutrino Bursts from Stellar Collapse: A Sensitive Test of Neutrino Masses

N. Arnaud, M. Barsuglia, M. A. Bizouard +4

New methods are proposed with the goal to determine absolute neutrino masses from the simultaneous observation of the bursts of neutrinos and gravitational waves emitted during a s…

hep-ph2001★ 34 cited

sum rules and the SU(3) chiral expansion

B. Ananthanarayan, P. Büttiker, B. Moussallam

A recently proposed set of sum rules, based on the pion-Kaon scattering amplitudes and their crossing-symmetric conjugates are analysed in detail. A key role is played by the …

hep-ph2001★ 42 cited

Is a Large Intrinsic k_T Needed to Describe Photon + Jet Photoproduction at HERA?

M. Fontannaz, J. Ph. Guillet, G. Heinrich

We study the photoproduction of an isolated photon and a jet based on a code of partonic event generator type which includes the full set of next-to-leading order corrections. We c…

hep-ph2001★ 10 cited

On P-wave meson decay constants in the heavy quark limit of QCD

A. Le Yaouanc, L. Oliver, O. Pène +2

In previous work it has been shown that, either from a sum rule for the subleading Isgur-Wise function or from a combination of Uraltsev and Bjorken SR, one infers for …

hep-ph2001★ 25 cited

Diffusion corrections to the hard pomeron

Marcello Ciafaloni, Martina Taiuti, A. H. Mueller

The high-energy behaviour of two-scale hard processes is investigated in the framework of small-x models with running coupling, having the Airy diffusion model as prototype. We sho…

hep-ph2001★ 30 cited

Preliminary Calculation of from Green Functions with Dynamical Quarks

Ph. Boucaud, J. P. Leroy, H. Moutarde +4

We present preliminary results on the computation of the QCD running coupling constant in the scheme and Landau gauge with two flavours of dynamical Wilson quarks…

hep-ph2001★ 18 cited

QCD and Hadron Dynamics

Yuri L. Dokshitzer

Perturbative QCD predicts and describes various features of multihadron production. An amazing similarity between observable hadron systems and calculable underlying parton ensembl…

hep-ph2001★ 319 cited

Quenching of hadron spectra in media

R. Baier, Yu. L. Dokshitzer, A. H. Mueller +1

We determine how the yield of large transverse momentum hadrons is modified due to induced gluon radiation off a hard parton traversing a QCD medium. The quenching factor is formal…

hep-ph2001★ 26 cited

Calculation of 1-loop Hexagon Amplitudes in the Yukawa Model

T. Binoth, J. P. Guillet, G. Heinrich +1

We calculate a class of one-loop six-point amplitudes in the Yukawa model. The construction of multi-particle amplitudes is done in the string inspired formalism and compared to th…

hep-ph2001★ 727 cited

Heavy quark colorimetry of QCD matter

Yu. L. Dokshitzer, D. E. Kharzeev

We consider propagation of heavy quarks in QCD matter. Because of large quark mass, the radiative quark energy loss appears to be qualitatively different from that of light quarks…

hep-ph2001★ 72 cited

Strange Quark Mass from the Invariant Mass Distribution of Cabibbo-Suppressed Tau Decays

S. Chen, M. Davier, E. Gamiz +3

Quark mass corrections to the tau hadronic width play a significant role only for the strange quark, hence providing a method for determining its mass. The experimental input is th…

hep-ph2001★ 3 cited

x_F-dependence of J/Psi suppression in pA collisions

C. A. Salgado

Coherence effects are important in the description of collisions with extended objects as nuclei. At fixed target energies and small x_F, the coherence length of the fluctuation co…

hep-ph2001★ 21 cited

Preliminaries on a Lattice Analysis of The Pion Light-cone Wave function: a Partonic Signal?

A. Abada, Ph. Boucaud, G. Herdoiza +4

We present the first attempt of a new method to compute the pion light-cone wave function (LCWF) on the lattice. We compute the matrix element between the pion and the vacuum of a…

hep-ph2001★ 308 cited

A New Approach to a Global Fit of the CKM Matrix

A. Hocker, H. Lacker, S. Laplace +1

We report on a global CKM matrix analysis taking into account most recent experimental and theoretical results. The statistical framework (Rfit) developed in this paper advocates f…

hep-ph2001★ 42 cited

On the Angular Dependence of the Radiative Gluon Spectrum

R. Baier, Yu. L. Dokshitzer, A. H. Mueller +1

The induced momentum spectrum of soft gluons radiated from a high energy quark produced in and propagating through a QCD medium is reexamined in the BDMPS formalism. A mistake in o…

hep-ph2001★ 14 cited

CP Violation and the Absence of Second Class Currents in Charmless B Decays

Sandrine Laplace, Vasia Shelkov

The absence of second class currents together with the assumption of factorization for non-leptonic B decays provide new constraints on CP observables in decay B to a0(980)(to eta…