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

Journal Article · Fri Feb 20 04:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.072001· OSTI ID:21180218

Jiajun, Zhang; Chongsheng, Li; Jun, Gao; Hao, Zhang; Zhao, Li; Yuan, C -P; Yuan, T -C ^[1]

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1. Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)

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.

• OSTI ID: 21180218
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

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