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Unquenching effects on the coefficients of the Lüscher-Weisz action

Zh. Hao¹, G. M. von Hippel², R. R. Horgan³, Q. J. Mason^3,4, and H. D. Trottier^1,5

¹Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
²Department of Physics, University of Regina, Regina, Saskatchewan S4S 0A2, Canada
³DAMTP, Centre for Mathematical Sciences, University of Cambridge, Cambridge CB3 0WA, United Kingdom
⁴Barclays Capital, 5 The North Colonnade, Canary Wharf, London E14 4BB, United Kingdom
⁵TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A2, Canada

Phys. Rev. D 76, 034507 – Published 30 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.034507

Abstract

The effects of unquenching on the perturbative improvement coefficients in the Symanzik action are computed within the framework of Lüscher-Weisz on-shell improvement. We find that the effects of quark loops are surprisingly large, and their omission may well explain the scaling violations observed in some unquenched studies.

Article Text

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