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

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 $2\mathrm{f}{\mathrm{b}}^{-1}$, 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.

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