Thu·Sep 6, 2007Thursday·September 6, 2007

1. 01*

   Excited mesons on dynamical clover-Wilson lattices

   Tommy Burch🇩🇪 · Christian Ehmann🇩🇪 · Christian Hagen🇩🇪 · Martin Hetzenegger🇩🇪 · Andreas Schäfer🇩🇪

   We present results for masses of excited mesons from dynamical clover-Wilson lattices provided by the CP-PACS collaboration at pion masses down to 500 MeV. Our analysis of the data is based on using a matrix of correlators from various source and sink operators. The spectroscopy results are discussed and compared to experimental values.

   hep-latPoS(2007)·4 citations
2. 02*

   G_2 gauge theory at finite temperature

   Guido Cossu🇮🇹 · Massimo D'Elia🇮🇹 · Adriano Di Giacomo🇮🇹 · Biagio Lucini🇬🇧 · Claudio Pica🇺🇸

   The gauge group being centreless, $G_2$ gauge theory is a good laboratory for studying the role of the centre of the group for colour confinement in Yang-Mills gauge theories. In this paper, we investigate $G_2$ pure gauge theory at finite temperature on the lattice. By studying the finite size scaling of the plaquette, the Polyakov loop and their susceptibilities, we show that a deconfinement phase transition takes place. The analysis of the pseudocritical exponents give strong evidence of the deconfinement transition being first order. Implications of our findings for scenarios of colour confinement are discussed.

   hep-latJHEP(2007)·58 citations
3. 03*

   The closed string spectrum of SU(N) gauge theories in 2+1 dimensions

   Andreas Athenodorou🇬🇧 · Barak Bringoltz🇬🇧 · Michael Teper🇬🇧

   We use lattice techniques to study the closed-string spectrum of SU(N) gauge theories in 2+1 dimensions. We calculate the energies of the lowest lying ~30 states for strings with lengths between l ~ 0.45 fm and l ~ 3 fm, and compare to different theoretical predictions. We obtain unambiguous evidence that the closed-strings are in the universality class of the Nambu-Goto free bosonic string. Moreover, we clearly see that our data can be described by a covariant string theory with a small/moderate correction down to very short distance scales, and possibly on all distance scales at large-N.

   hep-lathep-thPLB(2007)·51 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.