Eur. Phys. J. A (2007) 31: 781-783
https://doi.org/10.1140/epja/i2006-10202-x

QNP 2006

WChPT analysis of twisted mass lattice data

¹ Graduate School of Pure and Applied Sciences, University of Tsukuba, 305-8571, Tsukuba, Japan
² Riken BNL Research Center, Brookhaven National Laboratory, 11973, Upton, NY, USA
³ Institute of Physics, Humboldt University Berlin, Newtonstrasse 15, 12489, Berlin, Germany

Received: 25 October 2006
Accepted: 1 November 2006
Published online: 28 February 2007

Abstract

We perform a Wilson Chiral Perturbation Theory (WChPT) analysis of quenched twisted mass lattice data. The data were generated by two independent groups with three different choices for the critical mass. For one choice, the so-called pion mass definition, one observes a strong curvature for small quark masses in various mesonic observables (“bending phenomenon”). Performing a combined fit to the next-to-leading (NLO) expressions, we find that WChPT describes the data very well and the fits provide very reasonable values for the low-energy parameters.