Perturbative Corrections for Staggered Four-Fermion Operators

Sharpe, Stephen and Patel, Apoorva (1993) Perturbative Corrections for Staggered Four-Fermion Operators. [Preprint]

Preview

PDF 9310004.pdf Download (444kB)

Abstract

We present results for one-loop matching coefficients between continuum four-fermion operators, defined in the Naive Dimensional Regularization scheme, and staggered fermion operators of various types. We calculate diagrams involving gluon exchange between quark lines, and ``penguin'' diagrams containing quark loops. For the former we use Landau gauge operators, with and without $O(a)$ improvement, and including the tadpole improvement suggested by Lepage and Mackenzie.For the latter we use gauge-invariant operators. Combined with existing results for two-loop anomalous dimension matrices and one-loop matching coefficients, our results allow a lattice calculation of the amplitudes for $K\bar K$ mixing and $K\to\pi\pi$ decays with all corrections of $O(g^2)$ included. We also discuss the mixing of $\Delta S=1$ operators with lower dimension operators, and show that, with staggered fermions, only a single lower dimension operator need be removed by non-perturbative subtraction.

Item Type:	Preprint
Additional Information:	Nucl. Phys. B417 (1994) 307
Department/Centre:	Division of Interdisciplinary Sciences > Supercomputer Education & Research Centre Division of Physical & Mathematical Sciences > Centre for Theoretical Studies (Ceased to exist at the end of 2003)
Date Deposited:	25 Aug 2008
Last Modified:	08 Apr 2011 09:13
URI:	http://eprints.iisc.ac.in/id/eprint/913

Actions (login required)

View Item