Precise determination of the Wtb couplings at LHC

Details Precise determination of the Wtb couplings at LHC Precise determination of the Wtb couplings at LHC

2002-08-19

arxiv.org/abs/hep-ph/0208171v3

Phys.Rev.D67:014009,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 12 pages, 2 PS figures. One reference added. To be published in PRD

Scientific paper

10.1103/PhysRevD.67.014009

Top pair production at LHC is the ideal place to search for nonstandard Wtb couplings in t -> W b -> l nu b decays. The lb forward-backward asymmetry in the W rest frame is very sensitive to sigma_{mu nu} couplings, and can spot one-loop QCD corrections to the decay vertex with more than 5 sigma statistical significance. We discuss the potential of this asymmetry to signal nonstandard gamma_mu and sigma_{mu nu} couplings and compare with top-antitop spin correlation asymmetries, which have a lower sensitivity. We also briefly summarise the results for Tevatron.

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