A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B-s(0) -> phi phi decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B-s(0)-(B) over bar (0)(s) mixing and the b -> s (s) over bars 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 B-s(0) -> phi phi 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%.

Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2013). First Measurement of the CP-Violating Phase in B-s(0) -> phi phi Decays. PHYSICAL REVIEW LETTERS, 110(24) [10.1103/PhysRevLett.110.241802].

First Measurement of the CP-Violating Phase in B-s(0) -> phi phi Decays

CALVI, MARTA;Martinelli, M;Pessina, G;
2013

Abstract

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B-s(0) -> phi phi decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B-s(0)-(B) over bar (0)(s) mixing and the b -> s (s) over bars 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 B-s(0) -> phi phi 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%.
Articolo in rivista - Articolo scientifico
LHC, flavour physics, CP violation
English
2013
110
24
none
Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2013). First Measurement of the CP-Violating Phase in B-s(0) -> phi phi Decays. PHYSICAL REVIEW LETTERS, 110(24) [10.1103/PhysRevLett.110.241802].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/47864
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