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

LHCb Collaboration

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Using the latest LHCb measurements of time-dependent CP violation in the Bs0→K+K- decay, a U-spin relation between the decay amplitudes of Bs0→K+K- and B0→π+π- decay processes allows constraints to be placed on the angle γ of the unitarity triangle and on the Bs0 mixing phase -2βs. Results from an extended approach, which uses additional inputs on B0→π0π0 and B+→π+π0 decays 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=(63.5-6.7+7.2)° modulo 180° is determined. In an alternative analysis, the value -2βs=-0.12-0.16+0.14 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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