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A novel machine-learning-based flavor-tagging algorithm combining same-side and opposite-side tagging is used to obtain the equivalent of 27 500 tagged Bₒ^0→J/ψϕ (1020) decays from pp collisions at sqrts=13 TeV, collected by the CMS experiment and corresponding to an integrated luminosity of 96. 5 fb^-1. A time- and flavor-dependent angular analysis of the μ^+μ^-K^+K^- final state, consistent with a ϕ (1020) →K^+K^- decay, is used to measure parameters of the Bₒ^0-Bover ¯ₒ^0 system. The weak phase is measured to be ϕₒ=-73±22 (stat) ±10 (syst) mrad, which, combined with the sqrts=8 TeV CMS result, gives ϕₒ=-75±23 mrad. This value differs from zero by 3. 2 standard deviations, providing the first evidence for mixing-induced CP violation in Bₒ^0→J/ψϕ (1020) decays. All measured physics parameters are found to agree with standard model predictions where available.
Hayrapetyan et al. (Fri,) studied this question.