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

Abstract

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}.

Authors:
;  [1];  [1]
  1. J. Stefan Institute, Jamova 39, P.O. Box 3000, 1001 Ljubljana (Slovenia)
Publication Date:
OSTI Identifier:
21410433
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 104; Journal Issue: 25; Other Information: DOI: 10.1103/PhysRevLett.104.252001; (c) 2010 The American Physical Society; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Drobnak, Jure, Kamenik, Jernej F, Fajfer, Svjetlana, and Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana. Flavor Changing Neutral Coupling Mediated Radiative Top Quark Decays at Next-to-Leading Order in QCD. United States: N. p., 2010. Web. doi:10.1103/PHYSREVLETT.104.252001.
Drobnak, Jure, Kamenik, Jernej F, Fajfer, Svjetlana, & Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana. Flavor Changing Neutral Coupling Mediated Radiative Top Quark Decays at Next-to-Leading Order in QCD. United States. https://doi.org/10.1103/PHYSREVLETT.104.252001
Drobnak, Jure, Kamenik, Jernej F, Fajfer, Svjetlana, and Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana. Fri . "Flavor Changing Neutral Coupling Mediated Radiative Top Quark Decays at Next-to-Leading Order in QCD". United States. https://doi.org/10.1103/PHYSREVLETT.104.252001.
@article{osti_21410433,
title = {Flavor Changing Neutral Coupling Mediated Radiative Top Quark Decays at Next-to-Leading Order in QCD},
author = {Drobnak, Jure and Kamenik, Jernej F and Fajfer, Svjetlana and Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana},
abstractNote = {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}.},
doi = {10.1103/PHYSREVLETT.104.252001},
url = {https://www.osti.gov/biblio/21410433}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 25,
volume = 104,
place = {United States},
year = {2010},
month = {6}
}