Mon·Oct 7, 2002Monday·October 7, 2002

1. 01*

   Wilson fermions with chirally twisted mass

   R. Frezzotti (INFN Milano and Univ. of Milano-Bicocca)🇮🇹

   Lattice formulations of QCD with Wilson fermions and a chirally twisted quark mass matrix provide an attractive framework for non-perturbative numerical studies. Owing to reparameterization invariance, the limiting continuum theory is just QCD. No spurious quark zero modes, which are responsible for the problem with exceptional configurations, can occur at finite values of the quark mass. Moreover, the details of the lattice formulation can be adjusted so as to simplify the renormalization and the O($a$) improvement of several quantities of phenomenological relevance. The first exploratory studies in the quenched approximation yield very encouraging results.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·30 citations
2. 02*

   The nucleon's strange electromagnetic and scalar matrix elements

   Randy Lewis🇨🇦 · W. Wilcox🇺🇸 · R. M. Woloshyn🇨🇦

   Quenched lattice QCD simulations and quenched chiral perturbation theory are used together for this study of strangeness in the nucleon. Dependences of the matrix elements on strange quark mass, valence quark mass and momentum transfer are discussed in both the lattice and chiral frameworks. The combined results of this study are in good agreement with existing experimental data and predictions are made for upcoming experiments. Possible future refinements of the theoretical method are suggested.

   ↳ hep-phhep-latnucl-thPRD(2003)·102 citations
3. 03*

   Perturbative and Non-perturbative Lattice Calculations for the Study of Parton Distributions

   Stefano Capitani🇩🇪

   We discuss how lattice calculations can be a useful tool for the study of structure functions. Particular emphasis is given to the perturbative renormalization of the operators.

   ↳ hep-phhep-latNucl.Phys.B Proc.Suppl.(2003)·3 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.