Measurement of CP violation in the Bs0→ϕϕ$$ {B}_s^0\to \phi \phi $$ decay and search for the B0→ ϕϕ decay

• Main Authors: Aaij, R. (Author), Abellán Beteta, C. (Author), Adeva, B. (Author), Adinolfi, M. (Author), Aidala, C. A (Author), Ajaltouni, Z. (Author), Akar, S. (Author), Albicocco, P. (Author), Albrecht, J. (Author), Alessio, F. (Author), Alexander, M. (Author), Alfonso Albero, A. (Author), Alkhazov, G. (Author), Alvarez Cartelle, P. (Author), Alves, A. A (Author), Amato, S. (Author), Amhis, Y. (Author), An, L. (Author), Anderlini, L. (Author)
• Format: Article
• Language: English
• Published: Springer Berlin Heidelberg, 2021-09-20T17:29:22Z.
• Subjects: Article
• Online Access: Get fulltext

 Abstract 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.