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P Alvarez Cartelle; Amato, S; Artamonov, A; Audurier, B; Balagura, V; Batozskaya, V; Battig, A; Belous, K; Bertolin, A; Bhasin, S; Blusk, S; Boettcher, T; Bondar, A; Brodski, M; Buchanan, E; Buytaert, J; Cardinale, R; Cardini, A; Casse, G; Cavallero, G; Chapman, M G; Chefdeville, M; Chen, S; S-G Chitic; Chobanova, V; Ciambrone, P; Collins, P; Da Silva, C L; E Dall’Occo; Danilina, A; De Paula, L; H-P Dembinski; Deschamps, O; Easo, S; Eidelman, S; A Fernandez Prieto; Fleuret, F; A Gallas Torreira; J Garra Tico; Gerick, D; Ghez, Ph; Gibson, V; C Gu; Gushchin, E; Gys, T; Heinicke, K; Huang, W; Hutchcroft, D; Jans, E; John, M; Jones, C R; Jost, B; Karacson, M; Kondybayeva, A; Krokovny, P; Lai, A; Leflat, A; Liu, X; Lupato, A; Majewski, M W; Malygina, H; Marchand, J F; Matev, R; McNab, A; Mödden, A; Muheim, F; Newcombe, R; Nguyen, T D; Nolte, N S; Pajero, T; Patrignani, C; Petrucci, S; Pili, M; Qian, W; Rama, M; M Ravonel Salzgeber; Richards, S; Rotondo, M; Guimaraes, V Salustino; Santimaria, M; Saur, M; Schellenberg, M; Serrano, J; Seyfert, P; Slater, M W; E Spadaro Norella; Stepanova, M; Szabelski, A; Tellarini, G; Tolk, S; Vagner, A; M van Beuzekom; P Vazquez Regueiro; Vieira, D; Williams, M R J; Wormser, G; Wotton, S A; Yeomans, L E; Zhang, W C; Zhelezov, A
The journal of high energy physics, 12/2019, Volume: 2019, Issue: 12Journal Article
A measurement of the time-dependent CP-violating asymmetry in Bs0→ϕϕ\ {B}_s^0\to \phi \phi \ 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\ \sqrt{s} \ = 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 Bs0→ϕϕ\ {B}_s^0\to \phi \phi \ decays is obtained. The CP-violating phase ϕsss¯s\ {\phi}_s^{s\overline{s}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¯→s¯ss¯s\ \overline{b}\to \overline{s}s\overline{s}s \ transitions. Finally, a limit on the branching fraction of the B0 → ϕϕ decay is determined to be BB0→ϕϕ<2.7×10−8\ \mathcal{B}\left({B}^0\to \phi \phi \right)<2.7\times {10}^{-8} \ at 90 % confidence level.
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