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Using approximately 1.3 fb-1 of data collected by the D0 detector between2002 and 2006, we measure the lifetime of the B_c meson in the B_c -> J/psi munu X final state. A simultaneous unbinned likelihood fit to the J/\psi+muinvariant mass and lifetime distributions yields a signal of 881 +/- 80 (stat)candidates and a lifetime measurement of \tau(B_c) = 0.448 +0.038 -0.036 (stat)+/- 0.032 (syst) ps.

Measurement of the lifetime of the B_c meson in the semileptonic decay channel