Perturbative calculation of O(a) improvement coefficients

Preprint

1 August 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-lat/0208004

Abstract

We compute several coefficients needed for O(a) improvement of currents in perturbation theory, using the Brodsky-Lepage-Mackenzie prescription for choosing an optimal scale q*. We then compare the results to non-perturbative calculations. Normalization factors of the vector and axial vector currents show good agreement, especially when allowing for small two-loop effects. On the other hand, there are large discrepancies in the coefficients of O(a) improvement terms. We suspect that they arise primarily from power corrections inherent in the non-perturbative methods.

Keywords

COMPUTE SEVERAL COEFFICIENTS
PERTURBATIVE CALCULATION
IMPROVEMENT COEFFICIENTS
PERTURBATIVE METHODS
PERTURBATION THEORY
COEFFICIENTS NEEDED
PRESCRIPTION
AXIAL VECTOR
HAND

All Related Versions

Version 1, 2002-08-01, ArXiv
Published version: Physical Review D, 67 (1), 014503.

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