Tue·Nov 13, 2001Tuesday·November 13, 2001

1. 01*

   Glueball and gluelump spectrum in abelian projected QCD

   V. Bornyakov🇩🇪 · G. Schierholz🇩🇪 · T. Streuer🇩🇪

   We study glueball and gluelump spectra calculated after abelian projection in both quenched and $N_f=2$ full QCD. The abelian projection is made after MA gauge fixing. We demonstrate that both spectra can be recovered despite the problem with positivity. We suggest the interpretation of some of the gluelump states in the language of the abelian projected theory.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·6 citations
2. 02*

   The Relationship of the Laplacian Gauge to the Landau Gauge

   Jeffrey E. Mandula🇺🇸

   The Laplacian gauge for gauge group SU(N) is discussed in perturbation theory. It is shown that to the lowest non-trivial order, O(g^1), configurations in the Laplacian gauge automatically satisfy the (finite difference) Landau gauge condition. Laplacian gauge fixed configurations are examined numerically and it is seen that to O(g^2) they do not remain in the Landau gauge.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·3 citations
3. 03*

   Spectrum of confining strings in SU(N) gauge theories

   Luigi Del Debbio🇮🇹 · Haralambos Panagopoulos🇨🇾 · Paolo Rossi🇮🇹 · Ettore Vicari🇮🇹

   We study the spectrum of the confining strings in four-dimensional SU(N) gauge theories. We compute, for the SU(4) and SU(6) gauge theories formulated on a lattice, the string tensions sigma_k related to sources with Z_N charge k, using Monte Carlo simulations. Our results are consistent with the sine formula sigma_k/sigma = sin k pi/N / sin pi/N for the ratio between sigma_k and the standard string tension sigma. For the SU(4) and SU(6) cases the accuracy is approximately 1% and 2%, respectively. The sine formula is known to emerge in various realizations of supersymmetric SU(N) gauge theories. On the other hand, our results show deviations from Casimir scaling. We also discuss an analogous behavior exhibited by two-dimensional SU(N) x SU(N) chiral models.

   ↳ hep-thhep-latJHEP(2002)·122 citations
4. 04*

   Goldstone Boson's Valence-Quark Distribution

   C.D. Roberts🇺🇸

   Dynamical chiral symmetry breaking (DCSB) is one of the keystones of low-energy hadronic phenomena. Dyson-Schwinger equations provide a model-independent quark-level understanding and correlate that with the behaviour of the pion's Bethe-Salpeter amplitude. This amplitude is a core element in the calculation of pion observables and combined with the dressed-quark Schwinger function required by DCSB it yields a valence-quark distribution function for the pion that behaves as (1-x)^2 for x~1, in accordance with perturbative analyses. This behaviour can be verified at contemporary experimental facilities.

   ↳ nucl-thhep-exhep-lathep-ph+1Nucl.Phys.B Proc.Suppl.(2002)·13 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.