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The lifetime of the $B_c^+$ meson is measured using semileptonic decayshaving a $J\!/\!\psi$ meson and a muon in the final state. The data,corresponding to an integrated luminosity of $2\mathrm{~fb^{-1}}$, arecollected 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 issystematic.

Measurement of the $B_c^+$ meson lifetime using $B_c^+ \to J\!/\!\psi\mu^+ \nu_{\mu} X$ decays