Thu·Nov 29, 2001Thursday·November 29, 2001

1. 01*

   Unquenched Studies Using the Truncated Determinant Algorithm

   A. Duncan (Univ. of Pittsburgh)🇺🇸 · E. Eichten (Fermilab)🇺🇸 · H. Thacker (Univ. of Virginia)🇺🇸

   A truncated determinant algorithm is used to study the physical effects of the quark eigenmodes associated with eigenvalues below 420 MeV. This initial high statistics study focuses on coarse ($6^4$) lattices (with O($a^2$) improved gauge action), light internal quark masses and large physical volumes. Three features of full QCD are examined: topological charge distributions, string breaking as observed in the static energy and the eta prime mass.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·0 citations
2. 02*

   Probing the QCD vacuum with overlap fermions

   Robert G. Edwards🇺🇸 · Urs M. Heller🇺🇸

   We use low lying eigenvectors of the overlap-Dirac operator as a probe of the QCD vacuum. If instantons play a significant role one would expect the low lying eigenmodes of the overlap-Dirac operator to consist mainly of the mixed ``would be zero modes''. Then, the eigenmodes should exhibit local chirality. Studying a recently introduced local chirality parameter, we find evidence supporting this picture.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·1 citation
3. 03*

   The eta and eta' mesons from lattice QCD

   C. Michael🇬🇧

   Lattice QCD allows a first-principles study of QCD with the freedom to vary the number and masses of the quarks. I present results on the flavour singlet correlations (this illuminates OZI violating effects) for mesons. Concentrating on the pseudoscalar mesons, the flavour singlet mass splitting ($\eta$, ${\eta }^{\prime }$ mass splitting) appears naturally. I also present results on an investigation of decay constants for the $\eta$ and ${\eta }^{\prime }$ ($f_{\eta }$) and discuss which quantities may be accessible in future lattice studies. The Witten-Veneziano approach can also be explored by determining the quenched topological susceptibility on a lattice.

   hep-lathep-phPhys.Scripta T(2002)·10 citations
4. 04*

   A Fermion Doublet With Chiral Gauge Interaction On A Lattice

   I. Schmelzer🇩🇪

   We present a new staggered discretization of the Dirac operator. Doubling gives only a doublet of Dirac fermions which we propose to interpret as a physical (lepton or quark) doublet. If coupled with gauge fields, an $(1+{\gamma }^5)$ chiral interaction appears in a natural way. We define a generalization for curved background which does not require tetrad variables. The approach suggests a natural explanation for the three fermion families.

   hep-lathep-thElectromagnetic Phenomena, vol.3, nr.1 (9…·2 citations
5. 05*

   Properties of the renormalized quark mass in the Schrodinger functional with a non-vanishing background field

   Stefan Kurth🇩🇪

   We compute the current quark mass in the Schrodinger functional with a non-vanishing background field at one loop order of perturbation theory. The results are used to obtain the critical mass at which the renormalized quark mass vanishes, and some lattice artefacts at one loop order.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·0 citations
6. 06*

   Lattice QCD and the Unitarity Triangle

   Andreas S. Kronfeld🇺🇸

   Theoretical and computational advances in lattice calculations are reviewed, with focus on examples relevant to the unitarity triangle of the CKM matrix. Recent progress in semi-leptonic form factors for B -> pi l nu and B -> D* l nu, as well as the parameter \xi in B-Bbar mixing, are highlighted.

   ↳ hep-phhep-latAIP Conf.Proc.(2002)·9 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.