Wed·Oct 16, 2002Wednesday·October 16, 2002

1. 01*

   Analysis of unstable particle with the maximum entropy method in O(4) ${\varphi }^4$ theory on the lattice

   T. Yamazaki🇯🇵 · N. Ishizuka🇯🇵

   We explore applications of the maximum entropy method (MEM) to determine properties of unstable particles using the four-dimensional O(4) ${\varphi }^4$ theory as a laboratory. The spectral function of the correlation function of the unstable $\sigma$ particle is calculated with MEM, and shown to yield reliable results for both the mass of $\sigma$ and the energy of the two-pion state. Calculations are also made for the case in which $\sigma$ is stable. Distinctive differences in the volume dependence of the $\sigma$ mass and two-pion energy for the stable and unstable cases are analyzed in terms of perturbation theory.

   hep-latPRD(2003)·12 citations
2. 02*

   String effects in Polyakov loop correlators

   M. Caselle🇮🇹 · M. Hasenbusch🇩🇪 · M. Panero🇮🇹 · P. Provero🇮🇹

   We compare the predictions of the effective string description of confinement in finite temperature gauge theories to high precision Monte Carlo data for the three-dimensional Z(2) gauge theory. We show that string interaction effects become more relevant as the temperature is increased towards the deconfinement one, and are well modeled by a Nambu-Goto string action.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·16 citations
3. 03*

   The gluonic excitation of the three-quark system in SU(3) lattice QCD

   Toru T. Takahashi🇯🇵 · Hideo Suganuma🇯🇵

   We present the first study of the gluonic excitation in the three-quark (3Q) system in SU(3) lattice QCD with $\beta$=5.8 and $16^3\times 32$ at the quenched level. For the spatially-fixed 3Q system, we measure the gluonic excited-state potential, which corresponds to the flux-tube vibrational energy in the flux-tube picture. The lowest gluonic-excitation energy in the 3Q system is found to be about 1GeV in the hadronic scale. This large gluonic-excitation energy is expected to bring about the success of the simple quark model without gluonic modes.

   hep-latPRL(2003)·49 citations
4. 04*

   Chiral symmetry restoration in hadron spectra

   L.Ya. Glozman🇦🇹

   The evidence and the theoretical justification of chiral symmetry restoration in high-lying hadrons is presented.

   ↳ hep-phhep-exhep-latnucl-ex+1PPNP(2003)·12 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.