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Showing 2000 · hep-phShow all

34 papers · 2 filters

hep-ph2000★ 1 cited

Relationship of pionium lifetime with pion scattering lengths in generalized chiral perturbation theory

H. Sazdjian

The pionium lifetime is calculated in the framework of the quasipotential-constraint theory approach, including the sizable electromagnetic corrections. The framework of generalize…

hep-ph2000★ 27 cited

Zweig rule violation in the scalar sector and values of low-energy constants

S. Descotes

We discuss the role of the Zweig rule violation in the scalar channel for the determination of low-energy constants and condensates arising in the effective chiral Lagrangian of QC…

hep-ph2000★ 239 cited

2000 CKM-Triangle Analysis A Critical Review with Updated Experimental Inputs and Theoretical Parameters

M. Ciuchini, G. D'Agostini, E. Franco +5

Within the Standard Model, a review of the current determination of the sides and angles of the CKM unitarity triangle is presented, using experimental constraints from the measure…

hep-ph2000★ 9 cited

Determination of Unitarity Triangle parameters: where do we stand ?

Achille Stocchi

In this note I review the current determination of the unitarity triangle parameters by using the theoretical and experimental information available in summer 2000.

hep-ph2000★ 17 cited

Near-to-planar 3-jet events in and beyond QCD perturbation theory

A. Banfi, Yu. L. Dokshitzer, G. Marchesini +1

We present the results of QCD analysis of out-of-event-plane momentum distribution in 3-jet e+e- annihilation events. We consider the all-order resummed perturbative prediction and…

hep-ph2000★ 2 cited

One Loop Soft Supersymmetry Breaking Terms in Superstring Effective Theories

Pierre Binetruy, Mary K. Gaillard, Brent D. Nelson

We perform a systematic analysis of soft supersymmetry breaking terms at the one loop level in a large class of string effective field theories. This includes the so-called anomaly…

hep-ph2000

at two-loops and CHPT predictions for -scattering

Gabriel Amoros, Johan Bijnens, Pere Talavera

We present the results from our two-loop calculations of masses, decay-constants, vacuum-expectation-values and the form-factors in three-flavour Chiral Perturbation Th…

hep-ph2000★ 6 cited

A geometrical estimation of saturation of partonic densities

N. Armesto, C. A. Salgado

We propose a new criterium for saturation of the density of partons both in nucleons and nuclei. It is applicable to any multiple scattering model which would be used to compute th…

hep-ph2000

Discrete ambiguities in the determination of the CP angles

J. Charles, L. Oliver

We review briefly the problem of the discrete ambiguities in the determination of the CKM angles, by classifying them into different categories. We then focus on cos(2beta) and the…

hep-ph2000★ 7 cited

On the microscopic dynamics of DCC formation

J. Serreau

The dynamics of the pion field after a quench is studied in the framework of the linear sigma model. Our aim is to determine to what extent the amplified pion field resembles the D…

hep-ph2000★ 7 cited

Comments on two papers by Kapusta and Wong

P. Aurenche, R. Baier, T. Becherrawy +7

We critically examine recently published results on the thermal production of massive vector bosons in a quark-gluon plasma. We claim the production rate is a collinear safe observ…

hep-ph2000★ 593 cited

Bottom-up thermalization in heavy ion collisions

R. Baier, A. H. Mueller, D. Schiff +1

We describe how thermalization occurs in heavy ion collisions in the framework of perturbative QCD. When the saturation scale is large compared to , thermalization t…

hep-ph2000★ 31 cited

Vacuum fluctuations of \bar{q}q and values of low-energy constants

S. Descotes, J. Stern

We discuss the influence of the vacuum fluctuations of \bar{q}q pairs on low-energy constants and condensates. The analysis of the Goldstone boson masses and decay constants shows…

hep-ph2000★ 4 cited

Hyperon Enhancement in the Dual Parton Model

A. Capella, C. A. Salgado

We review the two sources of hyperon enhancement in the dual parton model: strings originating from diquark-antidiquark pairs in the nucleon sea and net baryons containing two or t…

hep-ph2000★ 42 cited

Constraints on both bilinear and trilinear R-parity violating couplings from neutrino laboratories and astrophysics data

Asmaa Abada, Marta Losada

We consider neutrino masses generated at tree level and at one loop, through fermion--sfermion loop diagrams, in the MSSM with R-parity violation. Using the mass and…

hep-ph2000★ 86 cited

On power corrections to the event shape distributions in QCD

G. P. Korchemsky, S. Tafat

We study power corrections to the differential thrust, heavy jet mass and C-parameter distributions in the two-jet kinematical region in e^+e^- annihilation. We argue that away fro…

hep-ph2000★ 4 cited

Can R-parity violation explain the LSND data as well?

Asmaa Abada, Gautam Bhattacharyya

The recent Super-Kamiokande data now admit only one type of mass hierarchy in a framework with three active and one sterile neutrinos. We show that neutrino masses and mixings gene…

hep-ph2000★ 29 cited

Deep Inelastic Scattering Data and the Problem of Saturation in Small-x Physics

A. Capella, E. G. Ferreiro, A. B. Kaidalov +1

We investigate the role of unitarization effects in virtual photon-proton (γ^*p) interactions at small x. The q\bar{q}-fluctuation of the initial photon is separated into a small d…

hep-ph2000★ 124 cited

Theory and Phenomenology of Type I strings and M-theory

Emilian Dudas

The physical motivations and the basic construction rules for Type I strings and M-theory compactifications are reviewed in light of the recent developments. The first part contain…

hep-ph2000★ 71 cited

Cosmological constant vs. quintessence

Pierre Binetruy

There is some evidence that the Universe is presently undergoing accelerating expansion. This has restored some credit to the scenarios with a non-vanishing cosmological constant.…

hep-ph2000★ 41 cited

Soft SUSY Breaking, Dilaton Domination and Intermediate Scale String Models

S. A. Abel, B. C. Allanach, L. Ibanez +2

We present an analysis of the low-energy implications of an intermediate scale ~10^{11} GeV string theory. We mainly focus on the evolution of the physical parameters under the ren…

hep-ph2000★ 30 cited

Perturbative and non-perturbative aspects of moments of the thrust distribution in e+e- annihilation

Einan Gardi

Resummation and power-corrections play a crucial role in the phenomenology of event-shape variables like the thrust T. Previous investigations showed that the perturbative contribu…

hep-ph2000★ 25 cited

The pionium lifetime in generalized chiral perturbation theory

H. Sazdjian

Pionium lifetime corrections to the nonrelativistic formula are calculated in the framework of the quasipotential-constraint theory approach. The calculation extends an earlier eva…

hep-ph2000

New Directions for New Dimensions: From Strings to Neutrinos to Axions to...

Keith R. Dienes

In this talk, I discuss recent developments concerning the possibility of large extra spacetime dimensions. After briefly reviewing how such dimensions can lower the fundamental GU…