Determination of γ and -2βfrom charmless two-body decays of beauty mesons

LHCb Collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. AnderliniJ. Anderson, R. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

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Using the latest LHCb measurements of time-dependent CP violation in the B0s→K+K- decay, a U-spin relation between the decay amplitudes of B0s→K+K- and B0→π+π-decay processes allows constraints to be placed on the angle γ of the unitarity triangle and on the B0s mixing phase -2βs. Results from an extended approach, which uses additional inputs on B0→π0π0and B+→π+π0decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value γ=(63.5+7.2-6.7)° modulo 180° is determined. In an alternative analysis, the value -2βs=-0.12+0.14-0.16 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Early online date9 Dec 2014
Publication statusPublished - 4 Feb 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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