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Flavor changing neutral coupling mediated radiative top quark decays at next-to-leading order in QCD.
MedLine Citation:
PMID:  20867366     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
We compute the branching ratios for the rare top quark decays t→cγ and t→cZ mediated by effective flavor changing neutral couplings at next-to-leading order in QCD, including the effects due to operator mixing. After resumming contributions of the order of [α{s}log(Λ/m{t})]{n}, where Λ is the scale at which the effective operators are generated, using renormalization group methods, we compute finite matrix element corrections and study the effects of experimental kinematic cuts on the extracted branching ratios. We find that the t→cγ decay can also be used to probe the effective operators mediating t→cg processes, since the latter can naturally contribute 10% or more to the radiative decay. Conversely, any experimental signal of t→cg would indicate a natural lower bound on t→cZ, γ.
Authors:
Jure Drobnak; Svjetlana Fajfer; Jernej F Kamenik
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Publication Detail:
Type:  Journal Article     Date:  2010-06-24
Journal Detail:
Title:  Physical review letters     Volume:  104     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-09-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  252001     Citation Subset:  -    
Affiliation:
J. Stefan Institute, Jamova 39, P.O. Box 3000, 1001 Ljubljana, Slovenia. jure.drobnak@ijs.si
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