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    Measurement of τL\tau _\text {L} using the Bs0→J/ψη{B} _s^0 \rightarrow J/\psi \eta decay mode

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    Using a proton–proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of 5.7 fb−15.7~\text {fb}^{-1}, the lifetime of the light Bs0{{B} ^0_{s}} mass eigenstate, τL\tau _{L}, is measured using the Bs0→J/ψηB^0_s \rightarrow J/\psi \eta decay mode to be τL=1.445±0.016(stat)±0.008(syst) ps.\begin{aligned} \tau _{\text {L}} = 1.445 \pm 0.016 \text {(stat)} \pm 0.008 \text {(syst)} \,\text {ps}. \end{aligned}A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 fb−1^{-1} of integrated luminosity gives τL=1.452±0.014±0.007±0.002 ps,\begin{aligned} \tau _{\text {L}} = 1.452 \pm 0.014 \pm 0.007 \pm 0.002 \,\text {ps}, \end{aligned}where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty.Using a proton-proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of 5.7 fb−1\text{fb}^{-1}, the lifetime of the Bs0B_{s}^{0} mass eigenstate, τL\tau_{L}, is measured using Bs0→J/ψηB_{s}^{0} \to J/\psi \eta decay mode to be τL\tau_{L} = 1.445 ±\pm 0.016(stat) ±\pm 0.008(syst) ps. A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 fb−1\text{fb}^{-1} of integrated luminosity gives τL\tau_{L} = 1.452 ±\pm 0.014 ±\pm 0.007 ±\pm 0.002 ps, where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty
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