Mon·Sep 24, 2001Monday·September 24, 2001

1. 01*

   Calculating the I=2 Pion Scattering Length Using Tadpole Improved Clover Wilson Action on Coarse Anisotropic Lattices

   Chuan Liu🇨🇳 · Junhua Zhang🇨🇳 · Ying Chen🇨🇳 · J.P. Ma🇨🇳

   In an exploratory study, using the tadpole improved clover Wilson quark action on small, coarse and anisotropic lattices, the $\pi \pi$ scattering length in the I=2 channel is calculated within quenched approximation. A new method is proposed which enables us to make chiral extrapolation of our lattice results without calculating the decay constant on the lattice. Finite volume and finite lattice spacing errors are analyzed and the results are extrapolated towards the infinite volume and continuum limit. Comparisons of our lattice results with the new experiment and the results from Chiral Perturbation Theory are made. Good agreements are found.

   hep-lathep-phNPB(2002)·62 citations
2. 02*

   Theory of color confinement: state of the art

   A. Di Giacomo🇮🇹 · G. Paffuti🇮🇹

   The existing evidence for dual superconductivity as mechanism of color confinement is reviewed. We also discuss what is known on the dual excitations, which produce confinement by condensation, and what are the open problems

   hep-lat1 citation
3. 03*

   Chiral properties of domain-wall fermions from eigenvalues of 4 dimensional Wilson-Dirac operator

   S. Aoki🇯🇵 · Y. Taniguchi (University of Tsukuba)🇯🇵

   We investigate chiral properties of the domain-wall fermion (DWF) system by using the four-dimensional hermitian Wilson-Dirac operator. We first derive a formula which connects a chiral symmetry breaking term in the five dimensional DWF Ward-Takahashi identity with the four dimensional Wilson-Dirac operator, and simplify the formula in terms of only the eigenvalues of the operator, using an ansatz for the form of the eigenvectors. For a given distribution of the eigenvalues, we then discuss the behavior of the chiral symmetry breaking term as a function of the fifth dimensional length. We finally argue the chiral property of the DWF formulation in the limit of the infinite fifth dimensional length, in connection with spectra of the hermitian Wilson-Dirac operator in the infinite volume limit as well as in the finite volume.

   hep-latPRD(2002)·15 citations
4. 04*

   Quenched QCD at finite temperature with overlap Fermions

   R. V. Gavai🇮🇳 · Sourendu Gupta🇮🇳 · R. Lacaze🇫🇷

   We study quenched QCD just above the phase transition temperature using overlap Fermions. Exact zero modes of the overlap operator are localized. Chiral symmetry is restored, as indicated by the behavior of the chiral condensate after subtracting the effects of zero modes. The vector and pseudo-scalar screening masses are close to ideal gas values.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·0 citations
5. 05*

   Spectral function at high temperature

   Gert Aarts (Heidelberg)🇩🇪

   For a weakly coupled quantum field at high temperature the classical approximation offers a possibility to gain insight into nonperturbative real-time dynamics. I use this to present a nonperturbative approach to the computation of spectral functions in real time. Results are shown for a scalar field in 2+1 dimensions.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·1 citation
6. 06*

   Heavy-Meson Observables at One-Loop in Partially Quenched Chiral Perturbation Theory

   Martin J. Savage🇺🇸

   I present one-loop level calculations of the Isgur-Wise functions for B -> D^{(*)} + e + nu, of the matrix elements of isovector twist-2 operators in B and D mesons, and the matrix elements for the radiative decays D^* -> D + gamma in partially quenched heavy quark chiral perturbation theory. Such expressions are required in order to extrapolate from the light quark masses used in lattice simulations of the foreseeable future to those of nature.

   ↳ hep-phhep-latnucl-thPRD(2002)·32 citations
7. 07*

   Hard Scattering and Gauge/String Duality

   Joseph Polchinski (U.C. Santa Barbara)🇺🇸 · Matthew J. Strassler (U. Pennsylvania)🇺🇸

   We consider high-energy fixed-angle scattering of glueballs in confining gauge theories that have supergravity duals. Although the effective description is in terms of the scattering of strings, we find that the amplitudes are hard (power law). This is a consequence of the warped geometry of the dual theory, which has the effect that in an inertial frame the string process is never in the soft regime. At small angle we find hard and Regge behaviors in different kinematic regions.

   ↳ hep-thhep-lathep-phPRL(2002)·858 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.