Fri·Aug 9, 2002Friday·August 9, 2002

1. 01*

   Confinement and the photon propagator in 3D compact QED: a lattice study in Landau gauge at zero and finite temperature

   M.N. Chernodub🇷🇺 · E.-M. Ilgenfritz🇯🇵 · A. Schiller🇩🇪

   On the lattice we study the gauge boson propagator of three dimensional compact QED in Landau gauge at zero and non-zero temperature. The non-perturbative effects are taken into account by the generation of a mass, by an anomalous dimension and by the photon wave function renormalization. All these effects can be attributed to the monopoles: they are absent in the propagator of the singularity-free part of the gauge field. We assess carefully the Gribov copy problem for the propagator and the parameters emerging from the fits.

   hep-latcond-mathep-phPRD(2003)·24 citations
2. 02*

   New methods to measure phase transition strength

   Wolfhard Janke🇩🇪 · Des Johnston🇬🇧 · Ralph Kenna🇬🇧

   A recently developed technique to determine the order and strength of phase transitions by extracting the density of partition function zeroes (a continuous function) from finite-size systems (a discrete data set) is generalized to systems for which (i) some or all of the zeroes occur in degenerate sets and/or (ii) they are not confined to a singular line in the complex plane. The technique is demonstrated by application to the case of free Wilson fermions.

   hep-latcond-mat.stat-mechNucl.Phys.B Proc.Suppl.(2003)·3 citations
3. 03*

   Scalar mesons in QCD and tests of the gluon content of the sigma

   Stephan Narison (LPMT-CNRS Montpellier-France)🇫🇷

   We summarize the different features of the scalar mesons from QCD spectral sum rule analyses of the two- and three-point functions. The results do not favour the u-bar u + d-bar d interpretation of the broad and low mass sigma (0.6), and the u-bar s resonance nature of the eventually observed kappa(0.9) meson. We also discuss some OZI-violating and classic semileptonic and radiative decay processes which can reveal in a model-independent way the eventual gluon component sigma_B of the sigma. In a meson-gluonium mixing scenario, one also expects an observation of the K K-bar final states from the sigma_B which may compete (if phase space allowed) with the one from a low mass s-bar s state assumed in the literature to be the SU(3) partner of the $\sigma (0.6)$ if this latter is a u-bar u + d-bar d state

   ↳ hep-phhep-exhep-latnucl-thNucl.Phys.B Proc.Suppl.(2003)·23 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.