Thu·Sep 19, 2002Thursday·September 19, 2002

1. 01*

   Non-perturbative renormalisation of four fermion operators and B-bar B mixing with Wilson fermions

   D. Becirevic🇮🇹 · V. Gimenez🇪🇸 · V. Lubicz🇮🇹 · G. Martinelli🇮🇹 · M. Papinutto🇩🇪 · J. Reyes🇮🇹

   We present new results for the renormalisation and subtraction constants for the four fermion Delta F=2 operators, computed non-perturbatively in the RI-MOM scheme (in the Landau gauge). From our preliminary analysis of the lattice data at beta=6.45, for the B-bar B mixing bag-parameter we obtain B_B^{RGI} = 1.46(7)(1).

   hep-lathep-phNucl.Phys.B Proc.Suppl.(2003)·11 citations
2. 02*

   Quenched scalar meson correlator with Domain Wall Fermions

   S. Prelovsek🇺🇸 · K. Orginos🇺🇸

   We study the singlet and non-singlet scalar-meson masses using domain wall fermions and the quenched approximation. The singlet mass is found to be smaller than the non-singlet mass and indicates that the lowest singlet meson state could be lighter than 1 GeV. The two-point functions for very small quark masses are compared with expectations from the small-volume chiral perturbation theory and the presence of fermionic zero modes.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·38 citations
3. 03*

   The chiral limit of non-compact QED(3)

   S.J. Hands🇬🇧 · J.B. Kogut🇺🇸 · L. Scorzato🇩🇪 · C.G. Strouthos🇬🇧

   Non-compact QED(3) with four-component fermion flavor content larger than or equal to two is studied numerically near the chiral limit to understand its chiral symmetry breaking features. We monitor discretization and finite size effects on the chiral condensate by simulating the model at different values of the gauge coupling on lattices ranging in size from 10^3 to 50^3. Our upper bound for the dimensionless condensate beta^2<psibarpsi> in the N_f=2 case is 5x10^{-5}.

   hep-latcond-matNucl.Phys.B Proc.Suppl.(2003)·23 citations
4. 04*

   A Generalized Maximal Abelian Gauge in SU(3) Lattice Gauge Theory

   William W. Tucker🇺🇸 · John D. Stack🇺🇸

   We introduce a generalized Maximum Abelian Gauge (MAG). We work with this new gauge on 12^4 lattices for beta=5.7,5.8 and 16^4 lattices for beta=5.9,6.0. We also introduce a form of abelian projection related to the generalized MAG. We measure U(1)xU(1) wilson loops and single color magnetic current densities.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·4 citations
5. 05*

   Moving NRQCD for B Form Factors at High Recoil

   Kerryann M. Foley🇺🇸 · G. Peter Lepage🇺🇸

   We derive the continuum and lattice tree-level moving NRQCD (mNRQCD) through order 1/m^2. mNRQCD is a generalization of NRQCD for dealing with hadrons with nonzero velocity u_mu. The quark's total momentum is written as P^mu=Mu^mu+k^mu where k^mu << Mu^mu is discretized and Mu^mu is treated exactly. Radiative corrections to couplings on the lattice are discussed. mNRQCD is particularly useful for calculating B->pi and B->D form factors since errors are similar at low and high recoil.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·30 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.