Flavor Changing Neutral Coupling Mediated Radiative Top Quark Decays at Next-to-Leading Order in QCD

Journal Article · Fri Jun 25 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.252001· OSTI ID:21410433

Drobnak, Jure; Kamenik, Jernej F ^[1]; Fajfer, Svjetlana ^[1]

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1. J. Stefan Institute, Jamova 39, P.O. Box 3000, 1001 Ljubljana (Slovenia)

We compute the branching ratios for the rare top quark decays t{yields}c{gamma} and t{yields}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 [{alpha}{sub s}log({Lambda}/m{sub t})]{sup n}, where {Lambda} 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{yields}c{gamma} decay can also be used to probe the effective operators mediating t{yields}cg processes, since the latter can naturally contribute 10% or more to the radiative decay. Conversely, any experimental signal of t{yields}cg would indicate a natural lower bound on t{yields}cZ, {gamma}.

• OSTI ID: 21410433
• Journal Information: Physical Review Letters, Vol. 104, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.104.252001; (c) 2010 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CORRECTIONS
COUPLING
FLAVOR MODEL
MATRIX ELEMENTS
QUANTUM CHROMODYNAMICS
RADIATIVE DECAY
RENORMALIZATION
SIGNALS
T QUARKS
COMPOSITE MODELS
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
MATHEMATICAL MODELS
PARTICLE DECAY
PARTICLE MODELS
POSTULATED PARTICLES
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
TOP PARTICLES