Twisted mass QCD and lattice approaches to the ΔI = 1/2 rule

, and

Published 4 November 2004 • Published under licence by IOP Publishing Ltd
, , Citation Carlos Pena et al JHEP09(2004)069 DOI 10.1088/1126-6708/2004/09/069

Download Article PDF

Article metrics

192 Total downloads

Share this article

Author affiliations

1 DESY, Theory Group, Notkestraße 85, D-22603 Hamburg, Germany

2 Departamento de Física Teórica, Facultad de Ciencias C-XI, Universidad Autónoma de Madrid, E-28049 Cantoblanco, Madrid, Spain

3 Instituto de Física Teórica, CSIC/UAM, Facultad de Ciencias C-XVI, Universidad Autónoma de Madrid, E-28049 Cantoblanco, Madrid, Spain

4 INFN - Sezione di Roma 2, c/o Dipartimento di Fisica, Università di Roma ``Tor Vergata'', Via della Ricerca Scientifica 1, I-00133 Rome, Italy

Dates

  1. Received 7 June 2004
  2. Accepted 29 September 2004
  3. Published

Buy this article in print

1126-6708/2004/09/069

Abstract

Twisted mass lattice QCD (tmQCD), generalised to four Wilson quark flavours, can be used for the computation of some weak matrix elements related to ΔI = 1/2 transitions. Besides eliminating unphysical zero modes, tmQCD may alleviate the four-quark operator renormalisation problems encountered in the calculation of CP-conserving K→π matrix elements with traditional Wilson fermion regularisation. With an active charm quark, the renormalisation of the K→π matrix elements requires at most the subtraction of a linearly divergent counterterm. Furthermore, in the (partially) quenched approximation the twist angles can be chosen so that only a finite counterterm needs to be subtracted.

Export citation and abstract BibTeX RIS

Previous article in issue
Next article in issue
Please wait… references are loading.
10.1088/1126-6708/2004/09/069