First measurement of the $CP$-violating phase in $B^0_s\to J/ψ(\to e^+e^-)ϕ$ decays

Abstract

A flavour-tagged time-dependent angular analysis of $B^0_s\to J/ψϕ$ 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 $B^0_s$ system are measured to be $ϕ_s=0.00\pm0.28\pm0.07$ rad, $ΔΓ_s=0.115\pm0.045\pm0.011$ ps$^{-1}$ and $Γ_s=0.608\pm0.018\pm0.012$ 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 $B^0_s\to J/ψϕ$ 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.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-042.html (LHCb public pages)