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

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

2008-10-21

arxiv.org/abs/0810.3889v4

Phys.Rev.Lett.102:072001,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, minor changes, typos corrected

Scientific paper

10.1103/PhysRevLett.102.072001

D0 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 $\kappa^g_{tc}/\Lambda$ and $\kappa^g_{tu}/\Lambda$ 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 + \gamma$ 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.

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