A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s → ϕ ϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-antiB0s mixing and the b → s anti-s s gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0 fb^−1 and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B0s → ϕ ϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [−2.46,−0.76] rad at a 68% confidence level. The p value of the standard model prediction is 16%.

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, et al. (2013). First Measurement of the CP-Violating Phase in B0s → ϕ ϕ Decays. PHYSICAL REVIEW LETTERS, 110(24), 1-8 [10.1103/PhysRevLett.110.241802].

First Measurement of the CP-Violating Phase in B0s → ϕ ϕ Decays

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2013

Abstract

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s → ϕ ϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-antiB0s mixing and the b → s anti-s s gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0 fb^−1 and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B0s → ϕ ϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [−2.46,−0.76] rad at a 68% confidence level. The p value of the standard model prediction is 16%.
2013
R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, et al. (2013). First Measurement of the CP-Violating Phase in B0s → ϕ ϕ Decays. PHYSICAL REVIEW LETTERS, 110(24), 1-8 [10.1103/PhysRevLett.110.241802].
R. Aaij; C. Abellan Beteta; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/145511
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