Eur. Phys. J. C 71, 1532 (2011)
https://doi.org/10.1140/epjc/s10052-010-1532-y

In pursuit of new physics with B⁰_s → K⁺K^-

Nikhef, Science Park 105, 1098 XG, Amsterdam, The Netherlands

Robert.Fleischer@nikhef.nl

Received: 5 November 2010
Published online: 15 January 2011

Abstract

The decay is the U-spin partner of and allows a determination of the angle γ of the unitarity triangle of the Cabibbo–Kobayashi–Maskawa matrix. Using updated information on the branching ratio and the relevant hadronic form factors, we discuss the picture that emerges for γ from the currently available data, which is in good agreement with the fits of the unitarity triangle. We point out that the decay also offers interesting probes to search for new physics in – mixing, thereby complementing the well-known analyses. The relevant observables are the effective lifetime of this channel and its mixing-induced CP asymmetry. We calculate correlations between these quantities and the CP-violating – mixing phase, which serve as target regions for improved measurements at the Tevatron and the early data taking at the LHCb experiment. Finally, we discuss the expected situation for the optimal determination of γ at LHCb, exploiting precise measurements of the CP violation in .