Measurement of the $B_c^{-}$ meson lifetime in the decay $B_c^{-}\to J/\psi {\pi }^{-}$

Abstract

The lifetime of the $B_c^{-}$ meson is measured using 272 exclusive $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\pi }^{-}$ decays reconstructed in data from proton-antiproton collisions corresponding to an integrated luminosity of 6.7 fb${}^{-1}$ recorded by the CDF II detector at the Fermilab Tevatron. The lifetime of the $B_c^{-}$ meson is measured to be $\tau$($B_c^{-}$) = 0.452 $\pm$ 0.048(stat) $\pm$ 0.027(syst) ps. This is the first measurement of the $B_c^{-}$ meson lifetime in a fully-reconstructed hadronic channel, and it agrees with previous results and has comparable precision.

arXiv comment9 pages, 5 figures

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