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Effective Field Theory for Nonstandard Top Quark Couplings

By Nicolas Greiner, Scott Willenbrock and Cen Zhang

Abstract

We present an effective-field-theory calculation of the effect of a dimension-six operator involving the top quark on precision electroweak data via a top-quark loop. We demonstrate the renormalizability, in the modern sense, of the effective field theory. We use the oblique parameter U to bound the coefficient of the operator, and compare with the bound derived from top-quark decay.Comment: 10 pages, 3 figure

Topics: High Energy Physics - Phenomenology
Year: 2011
DOI identifier: 10.1016/j.physletb.2011.09.026
OAI identifier: oai:arXiv.org:1104.3122
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