Mon·Sep 5, 2005Monday·September 5, 2005

1. 01*

   Automated Methods in Chiral Perturbation Theory on the Lattice

   Bugra Borasoy🇩🇪 · Georg M. von Hippel🇨🇦 · Hermann Krebs🇩🇪 · Randy Lewis🇨🇦

   We present a method to automatically derive the Feynman rules for mesonic chiral perturbation theory with a lattice regulator. The Feynman rules can be output both in a human-readable format and in a form suitable for an automated numerical evaluation of lattice Feynman diagrams. The automated method significantly simplifies working with improved or extended actions. Some applications to the study of finite-volume effects will be presented.

   hep-latPoS(2006)·2 citations
2. 02*

   B0-B0bar mixing in the static approximation from the Schroedinger Functional and twisted mass QCD

   F.Palombi🇩🇪 · M.Papinutto🇩🇪 · C.Pena🇨🇭 · H.Wittig🇩🇪

   We discuss the renormalisation properties of parity-odd Delta B=2 operators with the heavy quark treated in the static approximation. Via twisted mass QCD (tmQCD), these operators provide the matrix elements relevant for the B0-B0bar mixing amplitude. The layout of a non-perturbative renormalisation programme for the operator basis, using Schroedinger Functional techniques, is described. Finally, we report our results for a one-loop perturbative study of various renormalisation schemes with Wilson-type lattice regularisations, which allows, in particular, to compute the NLO anomalous dimensions of the operators in the SF schemes of interest.

   hep-latPoS(2006)·5 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.