Measurement of the B(c)(+) meson lifetime using the decay mode B(c)(+)-> J/psi e(+)nu(e) RID G-1087-2011 RID E-4473-2011

We present a measurement of the B(c)(+) meson lifetime in the decay mode B(c)(+) -> J/psi e(+) nu(e) using the Collider Detector at Fermilab II detector at the Fermilab Tevatron Collider. From a sample of about 360 pb(-1) of pp collisions at root s = 1.96 TeV, we reconstruct J/psi e(+) pairs with invariant mass in the kinematically allowed range 4 < M(J/psi e) < 6 GeV/c(2). A fit to the decay-length distribution of 238 signal events yields a measured B(c)(+) meson lifetime of 0.463(-0.065)(+0.073) (stat) +/- 0.036 (syst) ps.