Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/76502
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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 1550-2368 |
Statement of Responsibility: | 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 |
Published version: | http://dx.doi.org/10.1103/physrevd.81.014504 |
Appears in Collections: | Aurora harvest 4 Chemistry and Physics publications |
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hdl_76502.pdf | Published version | 791.45 kB | Adobe PDF | View/Open |
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