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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/185481
First measurement of the CP-violating phase in B0s→J/ψ( → e+e−)ϕ decays
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A flavour-tagged time-dependent angular analysis of B0 s → J/ψφ decays is presented where the J/ψ meson is reconstructed through its decay to an e +e − pair. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1 . The CP-violating phase and lifetime parameters of the B0 s system are measured to be φs = 0.00 ± 0.28 ± 0.05 rad, ∆Γs = 0.115 ± 0.045 ± 0.011 ps−1 and Γs = 0.608 ± 0.018 ± 0.011 ps−1 where the first uncertainty is statistical and the second systematic. This is the first time that CP-violating parameters are measured in the B0 s → J/ψφ decay with an e +e − pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.
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LHCb Collaboration, et al. First measurement of the CP-violating phase in B0s→J/ψ( → e+e−)ϕ decays. Journal of High Energy Physics. 2021. Vol. 2021, num. 1-28. ISSN 1126-6708. [consulted: 13 of June of 2026]. Available at: https://hdl.handle.net/2445/185481