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 → π0 π0 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.

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, et al. (2015). Determination of γ and −2βs from 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 −2βs from Charmless Two-Body Decays of Beauty Mesons

CARBONE, ANGELO;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2015

Abstract

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 → π0 π0 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.
2015
R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, et al. (2015). Determination of γ and −2βs from Charmless Two-Body Decays of Beauty Mesons. PHYSICS LETTERS. SECTION B, 741, 1-11 [10.1016/j.physletb.2014.12.015].
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. ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/402975
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