The S Parameter in QCD from Domain Wall Fermions

Peter boyle; Luigi Del Debbio; Jan Wennekers; James zanotti

doi:10.1103/PhysRevD.81.014504

The S Parameter in QCD from Domain Wall Fermions

Peter boyle, Luigi Del Debbio, Jan Wennekers, James zanotti

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 nf = 2 + 1 flavors of Domain Wall Fermions at a scale of a-1 = 2.33GeV. Relating l5 to the S parameter in QCD we obtain a value of S(mH=120GeV) = 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.

Original language	English
Pages (from-to)	-
Number of pages	8
Journal	Physical Review D
Volume	81
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.81.014504
Publication status	Published - 14 Jan 2010

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hep-lat

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The S Parameter in QCD from Domain Wall Fermions

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