A measurement of the decay time-dependent CP-violating asymmetry in Bs0→φφ 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 Bs0-B¯s0 mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 3.0fb-1 collected with the LHCb detector, a signal yield of approximately 4000 Bs0→φφ decays is obtained. The CP-violating phase is measured to be φs=-0.17±0.15(stat)±0.03(syst)rad. The triple-product asymmetries are measured to be AU=-0.003±0.017(stat)±0.006(syst) and AV=-0.017±0.017(stat)±0.006(syst). Results are consistent with the hypothesis of CP conservation.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2014). Measurement of CP violation in Bs0 →φφ decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 90(5) [10.1103/PhysRevD.90.052011].

Measurement of CP violation in Bs0 →φφ decays

Borsato, M;CALVI, MARTA;CASSINA, LORENZO;GOTTI, CLAUDIO;KHANJI, BASEM;KUCHARCZYK, MARCIN;Martinelli, M;
2014

Abstract

A measurement of the decay time-dependent CP-violating asymmetry in Bs0→φφ 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 Bs0-B¯s0 mixing and the loop-induced decay amplitude. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 3.0fb-1 collected with the LHCb detector, a signal yield of approximately 4000 Bs0→φφ decays is obtained. The CP-violating phase is measured to be φs=-0.17±0.15(stat)±0.03(syst)rad. The triple-product asymmetries are measured to be AU=-0.003±0.017(stat)±0.006(syst) and AV=-0.017±0.017(stat)±0.006(syst). Results are consistent with the hypothesis of CP conservation.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics
English
2014
90
5
A105
none
Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2014). Measurement of CP violation in Bs0 →φφ decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 90(5) [10.1103/PhysRevD.90.052011].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/89338
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