A measurement of $\Delta {\Gamma }_s$

Abstract

Using a dataset corresponding to $9{\mathrm{fb}}^{-1}$ of integrated luminosity collected with the LHCb detector between 2011 and 2018 in proton-proton collisions, the decay-time distributions of the decay modes $B_s^0\to J/\psi {\eta }^{\prime }$ and $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ are studied. The decay-width difference between the light and heavy mass eigenstates of the $B_s^0$ meson is measured to be $\Delta {\Gamma }_s=0.087\pm 0.012\pm 0.009{\mathrm{ps}}^{-1}$, where the first uncertainty is statistical and the second systematic.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-025.html

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Cited by in corpus (1)

• Decay matrix of B-\bar{B} mixing: Mixing of dimension-seven operators into dimension-six operators under renormalization