New physics in tbW decay at next-to-leading order in QCD

Jure Drobnak, Svjetlana Fajfer, and Jernej F. Kamenik
Phys. Rev. D 82, 114008 – Published 9 December 2010

Abstract

We consider contributions of nonstandard 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 OLRb¯LσμνtRWμν contribution to the transverse-plus W helicity fraction (F+) is significantly enhanced compared to the leading order result at nonvanishing bottom quark mass. Nonetheless, presently the most sensitive observable to direct OLR contributions is the longitudinal W helicity fraction FL. In particular, the most recent CDF measurement of FL already provides the most stringent upper bound on OLR contributions, even when compared with indirect bounds from the rare decay BXsγ.

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  • Received 26 October 2010

DOI:https://doi.org/10.1103/PhysRevD.82.114008

© 2010 The American Physical Society

Authors & Affiliations

Jure Drobnak1,*, Svjetlana Fajfer1,2,†, and Jernej F. Kamenik1,‡

  • 1J. Stefan Institute, Jamova 39, Post Office Box 3000, 1001 Ljubljana, Slovenia
  • 2Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia

  • *jure.drobnak@ijs.si
  • svjetlana.fajfer@ijs.si
  • jernej.kamenik@ijs.si

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Issue

Vol. 82, Iss. 11 — 1 December 2010

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