Measurement of the $B_s^0\to J/\psi \eta$ lifetime

Abstract

Using a data set corresponding to an integrated luminosity of $3f{b}^{-1}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV, the effective lifetime in the $B_s^0\to J/\psi \eta$ decay mode, ${\tau }_{\text{eff}}$, is measured to be ${\tau }_{\text{eff}}=1.479\pm 0.034\text{(stat)}\pm 0.011\text{(syst)}$ ps. Assuming $CP$ conservation, ${\tau }_{\text{eff}}$ corresponds to the lifetime of the light $B_s^0$ mass eigenstate. This is the first measurement of the effective lifetime in this decay mode.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-017.html

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