Measurement of the B_c Meson Lifetime Using B_c ->J/Psi e nu

TL;DR

This paper reports a measurement of the B_c+ meson lifetime using semileptonic decay data from the CDF II detector, providing a precise value based on reconstructed decay events.

Contribution

First measurement of the B_c+ meson lifetime in the semileptonic decay mode using data from the Fermilab Tevatron Collider.

Findings

Measured B_c+ lifetime: 0.463 ps with uncertainties.

Reconstructed 238 signal events from 360 pb^-1 data.

Demonstrated feasibility of lifetime measurement in semileptonic decays.

Abstract

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