Critical hopping parameter in O(a) improved lattice QCD

H. Panagopoulos and Y. Proestos
Phys. Rev. D 65, 014511 – Published 12 December 2001
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Abstract

We calculate the critical value of the hopping parameter, κc, in O(a) improved lattice QCD, to two loops in perturbation theory. We employ the Sheikholeslami-Wohlert (clover) improved action for Wilson fermions. The quantity which we study is a typical case of a vacuum expectation value resulting in an additive renormalization; as such, it is characterized by a power (linear) divergence in the lattice spacing, and its calculation lies at the limits of applicability of perturbation theory. The dependence of our results on the number of colors N, the number of fermionic flavors, Nf, and the clover parameter cSW is shown explicitly. We compare our results with nonperturbative evaluations of κc coming from Monte Carlo simulations.

  • Received 16 August 2001

DOI:https://doi.org/10.1103/PhysRevD.65.014511

©2001 American Physical Society

Authors & Affiliations

H. Panagopoulos* and Y. Proestos

  • Department of Physics, University of Cyprus, P.O. Box 20537, Nicosia CY-1678, Cyprus

  • *Email address: haris@ucy.ac.cy
  • Present address: Department of Physics, Ohio State University, Columbus, OH 43210. Email address: yiannis@mps.ohio-state.edu

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Issue

Vol. 65, Iss. 1 — 1 January 2002

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