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Free keywords:
High Energy Physics - Experiment, hep-ex
MPINP:
LHCb - Abteilung Hofmann
Abstract:
The lifetime of the $B_c^+$ meson is measured using semileptonic decays
having a $J\!/\!\psi$ meson and a muon in the final state. The data,
corresponding to an integrated luminosity of $2\mathrm{~fb^{-1}}$, are
collected by the LHCb detector in $pp$ collisions at a centre-of-mass energy of
$8\,\mathrm{TeV}$. The measured lifetime is $$\tau = 509 \pm 8 \pm 12
\mathrm{~fs},$$ where the first uncertainty is statistical and the second is
systematic.