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Perturbative Corrections for Staggered Four-Fermion Operators

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

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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 Information Sciences > Supercomputer Education & Research Centre
Division of Physical & Mathematical Sciences > Centre for Theoretical Studies
Date Deposited: 25 Aug 2008
Last Modified: 08 Apr 2011 09:13
URI: http://eprints.iisc.ernet.in/id/eprint/913

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