Fri·Sep 20, 2002Friday·September 20, 2002

1. 01*

   Kaon Weak Matrix Elements with Wilson Fermions

   D.Becirevic🇮🇹 · Ph.Boucaud🇮🇹 · V.Gimenez🇪🇸 · C.-J.D.Lin🇬🇧 · V.Lubicz🇮🇹 · G.Martinelli🇮🇹 · M.Papinutto🇮🇹 · C.T.Sachrajda🇬🇧

   We present results of several numerical studies with Wilson fermions relevant for kaon physics. We compute the B_K parameter by using two different methods and extrapolate to the continuum limit. Our preliminary result is B_K(2 GeV)=0.66(7). Delta I=3/2 K->pi pi matrix elements are obtained by using the next-to-leading order expressions derived in chiral perturbation theory in which the low energy constants are determined by the lattice results computed at unphysical kinematics. From the simulation at beta=6.0 our (preliminary) results read: <pi pi|O_7(2 GeV)|K>_{I=2}=0.14(1)(1) GeV^3 and <pi pi|O_8(2GeV)|K>_{I=2}=0.69(6)(6) GeV^3.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·31 citations
2. 02*

   Nucleon matrix elements with domain wall fermions

   Konstantinos Orginos (RIKEN/BNL) · RBC Collaboration

   We present the status of our calculation of the first few moments of the nucleon structure functions. Our calculations are done using domain wall fermions in the quenched approximation with the DBW2 gauge action at 1.3GeV inverse lattice spacing.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·6 citations
3. 03*

   Center Vortices at N > 4 Colors

   J. Greensite🇺🇸 · S. Olejnik🇸🇰

   We discuss two issues related to the physics of center vortices in pure SU(N) lattice gauge theory at large N: (1) Center vortices are stable classical solutions of the Wilson action, as well as of a wide class of improved lattice actions, for any N > 4. (2) The natural scaling of k-string tensions at large N, in the vortex picture of confinement, is \sigma(k)=k \sigma(1). This is the common large N limit of Casimir and Sine Law scaling. The crucial feature for explaining this behavior is the existence of center monopoles.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·1 citation
4. 04*

   Temporal meson correlators at finite temperature on quenched anisotropic lattice

   K. Nomura🇯🇵 · O. Miyamura🇯🇵 · T. Umeda🇯🇵 · H. Matsufuru🇯🇵

   We study charmonium correlators at finite temperature in quenched anisotropic lattice QCD. The smearing technique is applied to enhance the low energy part of the correlator. We use two analysis procedures: the maximum entropy method for extraction of the spectral function without assuming specific form, as an estimate of the shape of spectral function, and the ${\chi }^2$ fit assuming typical forms as quantitative evaluation of the parameters associated to the forms. We find that at $T\simeq 0.9T_c$ the ground state peak has almost the same mass as at T=0 and almost vanishing width. At $T\simeq 1.1T_c$, our result suggests that the correlator still has nontrivial peak structure at almost the same position as below $T_c$ with finite width.

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

   Evidence for BCS Diquark Condensation in the 3+1d Lattice NJL Model

   Simon Hands🇬🇧 · David N. Walters (U.W.Swansea)🇬🇧

   We present results of numerical simulations of the 3+1d Nambu - Jona-Lasinio model with a non-zero baryon chemical potential mu, with particular emphasis on the superfluid diquark condensate and associated susceptibilities. The results, when extrapolated to the zero diquark source limit, are consistent with the existence of a non-zero BCS condensate at high baryon density. The nature of the infinite volume and zero temperature limits are discussed.

   hep-lathep-phnucl-thPLB(2002)·29 citations
6. 06*

   Gasser-Leutwyler coefficients: A progress report

   George T. Fleming (1)🇺🇸 · Daniel R. Nelson (1)🇺🇸 · Gregory W. Kilcup (1) ((1) The Ohio State University)🇺🇸

   Last year, we reported our first results on the determination of Gasser-Leutwyler coefficients using partially quenched lattice QCD with three flavors of dynamical staggered quarks. We give an update on our progress in determining two of these coefficients, including an exhaustive effort to estimate all sources of systematic error. At this conference, we have heard about algorithmic techniques to reduce staggered flavor symmetry breaking and a method to incorporate staggered flavor breaking into the partially quenched chiral Lagrangian. We comment on our plans to integrate these developments into our ongoing program.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·11 citations
7. 07*

   Progress in Lattice QCD

   Andreas S. Kronfeld🇺🇸

   After reviewing some of the mathematical foundations and numerical difficulties facing lattice QCD, I review the status of several calculations relevant to experimental high-energy physics. The topics considered are moments of structure functions, which may prove relevant to search for new phenomena at the LHC, and several aspects of flavor physics, which are relevant to understanding CP and flavor violation.

   ↳ hep-phhep-lateConf(2002)·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.