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→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=(63.5-6.7+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.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2015). Determination of γ and -2βsfrom charmless two-body decays of beauty mesons. PHYSICS LETTERS. SECTION B, 741, 1-11 [10.1016/j.physletb.2014.12.015].

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

Borsato, M;CALVI, MARTA;CASSINA, LORENZO;GOTTI, CLAUDIO;KHANJI, BASEM;Martinelli, M;MATTEUZZI, CLARA;
2015

Abstract

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→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=(63.5-6.7+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.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics
English
2015
741
1
11
none
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2015). Determination of γ and -2βsfrom charmless two-body decays of beauty mesons. PHYSICS LETTERS. SECTION B, 741, 1-11 [10.1016/j.physletb.2014.12.015].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/154109
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