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Title: QCD corrections to flavor changing neutral coupling mediated rare top quark decays

Abstract

Recently we have presented an analysis of flavor changing neutral coupling mediated radiative top quark decays at next-to-leading order in QCD. In the present paper we provide the details of the calculation of QCD corrections to t{yields}q{gamma} and t{yields}qZ decays within the effective theory approach including operator mixing. In particular, we calculate virtual matrix element corrections and the corresponding bremsstrahlung contributions. In the case of t{yields}q{gamma} we study the effects of kinematic cuts on the extracted branching ratios. Analytical formulas are given at all stages of the calculation. We find that the t{yields}q{gamma} decay can be used to probe also the effective operators mediating t{yields}qg processes, since these can naturally contribute 10% or more to the radiative decay, given typical experimental cuts on the decay kinematics at hadron colliders. Conversely, we argue that any positive experimental signal of the t{yields}qg process would indicate a natural lower bound on t{yields}q{gamma} decay rate.

Authors:
;  [1];  [1]
  1. J. Stefan Institute, Jamova 39, P.O. Box 3000, 1001 Ljubljana (Slovenia)
Publication Date:
OSTI Identifier:
21421357
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 82; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.82.073016; (c) 2010 American Institute of Physics; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BRANCHING RATIO; BREMSSTRAHLUNG; CORRECTIONS; COUPLING; FLAVOR MODEL; GAMMA DECAY; HADRONS; MATRIX ELEMENTS; MIXING; QUANTUM CHROMODYNAMICS; RADIATIVE DECAY; T QUARKS; COMPOSITE MODELS; DECAY; DIMENSIONLESS NUMBERS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; MATHEMATICAL MODELS; NUCLEAR DECAY; PARTICLE DECAY; PARTICLE MODELS; POSTULATED PARTICLES; QUANTUM FIELD THEORY; QUARK MODEL; QUARKS; RADIATIONS; TOP PARTICLES

Citation Formats

Drobnak, Jure, Kamenik, Jernej F, Fajfer, Svjetlana, and Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana. QCD corrections to flavor changing neutral coupling mediated rare top quark decays. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.82.073016.
Drobnak, Jure, Kamenik, Jernej F, Fajfer, Svjetlana, & Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana. QCD corrections to flavor changing neutral coupling mediated rare top quark decays. United States. https://doi.org/10.1103/PHYSREVD.82.073016
Drobnak, Jure, Kamenik, Jernej F, Fajfer, Svjetlana, and Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana. Fri . "QCD corrections to flavor changing neutral coupling mediated rare top quark decays". United States. https://doi.org/10.1103/PHYSREVD.82.073016.
@article{osti_21421357,
title = {QCD corrections to flavor changing neutral coupling mediated rare top quark decays},
author = {Drobnak, Jure and Kamenik, Jernej F and Fajfer, Svjetlana and Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana},
abstractNote = {Recently we have presented an analysis of flavor changing neutral coupling mediated radiative top quark decays at next-to-leading order in QCD. In the present paper we provide the details of the calculation of QCD corrections to t{yields}q{gamma} and t{yields}qZ decays within the effective theory approach including operator mixing. In particular, we calculate virtual matrix element corrections and the corresponding bremsstrahlung contributions. In the case of t{yields}q{gamma} we study the effects of kinematic cuts on the extracted branching ratios. Analytical formulas are given at all stages of the calculation. We find that the t{yields}q{gamma} decay can be used to probe also the effective operators mediating t{yields}qg processes, since these can naturally contribute 10% or more to the radiative decay, given typical experimental cuts on the decay kinematics at hadron colliders. Conversely, we argue that any positive experimental signal of the t{yields}qg process would indicate a natural lower bound on t{yields}q{gamma} decay rate.},
doi = {10.1103/PHYSREVD.82.073016},
url = {https://www.osti.gov/biblio/21421357}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 82,
place = {United States},
year = {2010},
month = {10}
}