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Type: Journal article
Title: S parameter in QCD from domain wall fermions
Author: Boyle, P.
Debbio, L.
Wennekers, J.
Zanotti, J.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2010; 81(1):014504:1-014504:8
Publisher: American Physical Soc
Issue Date: 2010
ISSN: 1550-7998
Statement of
Peter A. Boyle, Luigi Del Debbio, Jan Wennekers, and James M. Zanotti (RBC and UKQCD Collaborations)
Abstract: We have computed the SU(2) low-energy constant l₅ and the mass splitting between charged and neutral pions from a lattice QCD simulation of n(sub)f=2+1 flavors of domain wall fermions at a scale of a⁻¹=2.33  GeV. Relating l₅ to the S parameter in QCD we obtain a value of S(m(sub)H=120  GeV)=0.42(7), in agreement with previous determinations. Our result can be compared with the value of S from electroweak precision data which constrains strongly interacting models of new physics like technicolor. This work in QCD serves as a test for the methods to compute the S parameter with domain wall fermions in theories beyond the standard model. We also infer a value for the pion mass splitting in agreement with experiment.
Rights: © 2010 The American Physical Society
DOI: 10.1103/PhysRevD.81.014504
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