Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings

Simple item page
dc.creatorZhang, Jia Jun
dc.creatorLi, Chong Sheng
dc.creatorGao, Jun
dc.creatorZhang, Hao
dc.creatorLi, Zhao
dc.creatorYuan, C. -P.
dc.creatorYuan, Tzu-Chiang
dc.date2008-10-21
dc.date2009-01-03
dc.date.accessioned2026-07-07T12:46:58Z
dc.date.available2026-07-07T12:46:58Z
dc.descriptionD0 and CDF collaborations at the Fermilab Tevatron have searched for non-standard-model single top-quark production and set upper limits on the anomalous top quark flavor-changing neutral current (FCNC) couplings $κ^g_{tc}/Λ$ and $κ^g_{tu}/Λ$ using the measurement of 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. We find that the NLO corrections to the partial decay widths of the three decay channels $ t\to q + g$, $ t\to q + γ$ and $ t\to q + Z$ are at the order of 10% in magnitude and modify their branching ratios by about 20%, 0.4% and 2%, respectively, as compared to their leading order predictions.
dc.description4 pages, 3 figures, minor changes, typos corrected
dc.identifierhttps://arxiv.org/abs/0810.3889
dc.identifierhttp://arxiv.org/abs/0810.3889
dc.identifierPhys.Rev.Lett.102:072001,2009
dc.identifierdoi:10.1103/PhysRevLett.102.072001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/221562
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNext-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
dc.typetext

Files

Collections

arXiv