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Title: Next-to-Leading-Order QCD Corrections to the Top-Quark Decay via Model-Independent Flavor-Changing Neutral-Current Couplings

Abstract

D0 and CDF collaborations at the Fermilab Tevatron have searched for nonstandard-model single top-quark production and have set upper limits on the anomalous top-quark flavor-changing neutral-current (FCNC) couplings {kappa}{sub tc}{sup g}/{lambda} and {kappa}{sub tu}{sup g}/{lambda} using the measurement of the total cross section calculated at the next-to-leading order (NLO) in QCD. In this Letter, we report on the effect of anomalous FCNC couplings to various decay branching ratios of the top quark, calculated at the NLO. This result is not only mandatory for a consistent treatment of both the top-quark production and decay via FCNC couplings by D0 and CDF at the Tevatron, but is also important for the study of ATLAS and CMS sensitivity to these anomalous couplings at the CERN LHC.

Authors:
; ; ; ; ; ;  [1]
  1. Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
21180218
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 102; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevLett.102.072001; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BRANCHING RATIO; CERN LHC; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; FLAVOR MODEL; NEUTRAL CURRENTS; PARTICLE DECAY; QUANTUM CHROMODYNAMICS; T QUARKS; TOTAL CROSS SECTIONS

Citation Formats

Jiajun, Zhang, Chongsheng, Li, Jun, Gao, Hao, Zhang, Zhao, Li, Yuan, C -P, Yuan, T -C, Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1116, and Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan. Next-to-Leading-Order QCD Corrections to the Top-Quark Decay via Model-Independent Flavor-Changing Neutral-Current Couplings. United States: N. p., 2009. Web. doi:10.1103/PHYSREVLETT.102.072001.
Jiajun, Zhang, Chongsheng, Li, Jun, Gao, Hao, Zhang, Zhao, Li, Yuan, C -P, Yuan, T -C, Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1116, & Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan. Next-to-Leading-Order QCD Corrections to the Top-Quark Decay via Model-Independent Flavor-Changing Neutral-Current Couplings. United States. https://doi.org/10.1103/PHYSREVLETT.102.072001
Jiajun, Zhang, Chongsheng, Li, Jun, Gao, Hao, Zhang, Zhao, Li, Yuan, C -P, Yuan, T -C, Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1116, and Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan. Fri . "Next-to-Leading-Order QCD Corrections to the Top-Quark Decay via Model-Independent Flavor-Changing Neutral-Current Couplings". United States. https://doi.org/10.1103/PHYSREVLETT.102.072001.
@article{osti_21180218,
title = {Next-to-Leading-Order QCD Corrections to the Top-Quark Decay via Model-Independent Flavor-Changing Neutral-Current Couplings},
author = {Jiajun, Zhang and Chongsheng, Li and Jun, Gao and Hao, Zhang and Zhao, Li and Yuan, C -P and Yuan, T -C and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1116 and Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan},
abstractNote = {D0 and CDF collaborations at the Fermilab Tevatron have searched for nonstandard-model single top-quark production and have set upper limits on the anomalous top-quark flavor-changing neutral-current (FCNC) couplings {kappa}{sub tc}{sup g}/{lambda} and {kappa}{sub tu}{sup g}/{lambda} using the measurement of the total cross section calculated at the next-to-leading order (NLO) in QCD. In this Letter, we report on the effect of anomalous FCNC couplings to various decay branching ratios of the top quark, calculated at the NLO. This result is not only mandatory for a consistent treatment of both the top-quark production and decay via FCNC couplings by D0 and CDF at the Tevatron, but is also important for the study of ATLAS and CMS sensitivity to these anomalous couplings at the CERN LHC.},
doi = {10.1103/PHYSREVLETT.102.072001},
url = {https://www.osti.gov/biblio/21180218}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 7,
volume = 102,
place = {United States},
year = {2009},
month = {2}
}