New physics in t-> b W decay at next-to-leading order in QCD

Abstract

We consider contributions of non-standard tbW effective operators to the decay of an unpolarized top quark into a bottom quark and a W gauge boson at next-to-leading order in QCD. We find that the dipole operator O_{LR} contribution to the transverse-plus W helicity fraction F_+ is significantly enhanced compared to the leading order result at non-vanishing bottom quark mass. Nonetheless, presently the most sensitive observable to direct O_{LR} contributions is the longitudinal W helicity fraction F_L. In particular, the most recent CDF measurement of F_L already provides the most stringent upper bound on O_{LR} contributions, even when compared with indirect bounds from the rare decay B -> X_s gamma.

arXiv comment5 pages

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Cited by in corpus (23)

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• Light Higgs and Vector-like Quarks without Prejudice
• Top-quark decay into Higgs boson and a light quark at next-to-leading order in QCD
• Effective field theory approach to top-quark decay at next-to-leading order in QCD
• Probing anomalous tWb interactions with rare B decays
• A General Analysis of Wtb anomalous Couplings
• Effect of Anomalous Couplings on the Associated Production of a Single Top Quark and a Higgs Boson at the LHC
• Effective Field Theory for Nonstandard Top Quark Couplings
• Interplay of t --> b W Decay and B_q Meson Mixing in Minimal Flavor Violating Models
• Anomalous Top Couplings at Hadron Colliders Revisited
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• The right top coupling in the aligned two-Higgs-doublet model
• Effective approach to top-quark decay and FCNC processes at NLO accuracy
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• $O({\alpha }_s)$ perturbative and nonperturbative corrections to polarized semileptonic ${\Lambda }_b$ decay distributions