Thu·Aug 8, 2002Thursday·August 8, 2002

1. 01*

   A Study of Charmonium Systems across the Deconfinement Transition

   Saumen Datta🇩🇪 · Frithjof Karsch🇩🇪 · Peter Petreczky🇩🇪 · Ines Wetzorke🇩🇪

   We present results from lattice studies of charmonium systems near the deconfinement transition temperature. On quenched isotropic lattices with lattice spacings between 0.02 and 0.05 fm, bar{q} q systems with quark masses close to the charm mass and with different spin-parity quantum numbers are studied in the temperature range 0.9 Tc - 3 Tc. Results for temporal correlators of local operators, and the spectral functions constructed from them, are discussed. For the pseudoscalar and vector channels, the correlators are observed to change very little across the deconfinement transition, unlike in the case of the light quarks.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·94 citations
2. 02*

   On the chirality of quark modes

   Alex C. Kalloniatis (CSSM, Adelaide, Australia)🇦🇺 · Sergei N. Nedelko (JINR, Dubna, Russia)🇷🇺

   A model for the QCD vacuum based on a domainlike structured background gluon field with definite duality attributed to the domains has been shown elsewhere to give confinement of static quarks, a reasonable value for the topological susceptibility and indications that chiral symmetry is spontaneously broken. In this paper we study in detail the eigenvalue problem for the Dirac operator in such a gluon mean field. A study of the local chirality parameter shows that the lowest nonzero eigenmodes possess a definite mean chirality correlated with the duality of a given domain. A probability distribution of the local chirality qualitatively reproduces histograms seen in lattice simulations.

   ↳ hep-phhep-latPRD(2002)·12 citations
3. 03*

   Parametric resonance in quantum field theory

   J. Berges🇩🇪 · J. Serreau (U. of Heidelberg)🇩🇪

   We present the first study of parametric resonance in quantum field theory from a complete next-to-leading order calculation in a 1/N-expansion of the 2PI effective action, which includes scattering and memory effects. We present a complete numerical solution for an O(N)-symmetric scalar theory and provide an approximate analytic description of the nonlinear dynamics in the entire amplification range. We find that the classical resonant amplification at early times is followed by a collective amplification regime with explosive particle production in a broad momentum range, which is not accessible in a leading-order calculation.

   ↳ hep-phastro-phcond-mathep-lat+1PRL(2003)·221 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.