A measurement of the decay time-dependent CP-violating asymmetry in B0s → ϕ ϕ decays is presented, along with measurements of the T-odd triple-product asymmetries. In this decay channel, the CP-violating weak phase arises from the interference between B0s anti-B0s mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 3.0 fb^−1 collected with the LHCb detector, a signal yield of approximately 4000 B0s → ϕ ϕ decays is obtained. The CP-violating phase is measured to be ϕ_s = −0.17 ± 0.15(stat) ± 0.03(syst) rad. The triple-product asymmetries are measured to be A_U = −0.003 ± 0.017(stat) ± 0.006(syst) and A_V = −0.017 ± 0.017(stat) ± 0.006(syst). Results are consistent with the hypothesis of CP conservation.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2014). Measurement of CP Violation in B0s → ϕ ϕ Decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 90(5), 1-17 [10.1103/PhysRevD.90.052011].

Measurement of CP Violation in B0s → ϕ ϕ Decays

CARBONE, ANGELO;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2014

Abstract

A measurement of the decay time-dependent CP-violating asymmetry in B0s → ϕ ϕ decays is presented, along with measurements of the T-odd triple-product asymmetries. In this decay channel, the CP-violating weak phase arises from the interference between B0s anti-B0s mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 3.0 fb^−1 collected with the LHCb detector, a signal yield of approximately 4000 B0s → ϕ ϕ decays is obtained. The CP-violating phase is measured to be ϕ_s = −0.17 ± 0.15(stat) ± 0.03(syst) rad. The triple-product asymmetries are measured to be A_U = −0.003 ± 0.017(stat) ± 0.006(syst) and A_V = −0.017 ± 0.017(stat) ± 0.006(syst). Results are consistent with the hypothesis of CP conservation.
2014
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2014). Measurement of CP Violation in B0s → ϕ ϕ Decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 90(5), 1-17 [10.1103/PhysRevD.90.052011].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/349521
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