2026-04-13T01:58:48Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1620522025-12-05T16:41:49Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc LHCb Collaboration author Calvo Gómez, Míriam author Camboni, Alessandro author Coquereau, Samuel author Garrido Beltrán, Lluís author Gascón Fora, David author Gironella Gironell, Pere author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author Vilasis-Cardona, Xavier author Marin Benito, Carla author 2020-05-22T15:55:01Z 2020-05-22T15:55:01Z 2019-12-23 2020-05-22T15:55:02Z A measurement of the time-dependent CP-violating asymmetry in B0s → φφ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0 fb−1 collected by the LHCb experiment at centre-of-mass energies √ s = 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 B0 s → φφ decays is obtained. The CP-violating phase φ sss¯ s is measured to be −0.073 ± 0.115(stat) ± 0.027(syst) rad, under the assumption it is independent of the helicity of the φφ decay. In addition, the CP-violating phases of the transverse polarisations under the assumption of CP conservation of the longitudinal phase are measured. The helicity-independent direct CP-violation parameter is also measured, and is found to be |λ| = 0.99 ± 0.05(stat) ± 0.01(syst). In addition, T-odd triple-product asymmetries are measured. The results obtained are consistent with the hypothesis of CP conservation in ¯b → ss¯ ss¯ transitions. Finally, a limit on the branching fraction of the B0 → φφ decay is determined to be B(B0 → φφ) < 2.7 × 10−8 at 90 % confidence level. Hadrons Física de partícules Experiments Hadrons Particle physics Experiments Measurement of CP violation in the Bs0→ϕϕ decay and search for the B 0 → ϕϕ decay