Tue·Nov 27, 2001Tuesday·November 27, 2001

1. 01*

   Relativistic Bottomonium Spectrum from Anisotropic Lattices

   X. Liao🇺🇸 · T. Manke🇺🇸

   We report on a first relativistic calculation of the quenched bottomonium spectrum from anisotropic lattices. Using a very fine discretisation in the temporal direction we were able to go beyond the non-relativistic approximation and perform a continuum extrapolation of our results from five different lattice spacings (0.04-0.17 fm) and two anisotropies (4 and 5). We investigate several systematic errors within the quenched approximation and compare our results with those from non-relativistic simulations.

   hep-latPRD(2002)·44 citations
2. 02*

   Baryons in Partially Quenched Chiral Perturbation Theory

   Jiunn-Wei Chen🇺🇸 · Martin J. Savage🇺🇸

   We include the lowest-lying octet- and decuplet-baryons into partially quenched chiral perturbation theory. Perturbing about the chiral limit of the graded SU(6|3)_L x SU(6|3)_R flavor group of partially quenched QCD, we compute the leading one-loop contributions to the octet-baryon masses, magnetic moments and matrix elements of isovector twist-2 operators. We work in the isospin limit and keep two of the three sea quarks degenerate. The usefulness of the non-unique extension of the electric charge matrix and the isovector twist-2 operators from QCD to partially quenched QCD is discussed.

   hep-lathep-phnucl-thPRD(2002)·95 citations
3. 03*

   Chiral Logs in the Presence of Staggered Flavor Symmetry Breaking

   C. Bernard🇺🇸

   Chiral logarithms in $m_{\pi }^2$ are calculated at one loop, taking into account the leading contributions to flavor symmetry breaking due to staggered fermions. I treat both the full QCD case (2+1 light dynamical flavors) and the quenched case; finite volume corrections are included. My starting point is the effective chiral Lagrangian introduced by Lee and Sharpe. It is necessary to understand the one-loop diagrams in the ``quark flow'' picture in order to adjust the calculation to correspond to the desired number of dynamical quarks.

   hep-lathep-phPRD(2002)·123 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.