Measurement of the B_s⁰ Lifetime in the Exclusive Decay Channel B_s⁰ → J/ψΦ

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Gregory R. Snow, University of Nebraska-LincolnFollow
D0 Collaboration

Date of this Version

2-4-2005

Comments

Published by American Physical Society. Phys. Rev. Lett. 94, 042001 (2005). http://prl.aps.org. Copyright © 2005 American Physical Society. Used by permission.

Abstract

Using the exclusive decay B_s⁰ → J/ψ(μ⁺μ^-)Φ(K⁺K^-), we report the most precise single measurement of the B_s⁰ lifetime. The data sample corresponds to an integrated luminosity of approximately 220 pb^-1 collected with the D0 detector at the Fermilab Tevatron Collider in 2002–2004. We reconstruct 337 signal candidates, from which we extract the B_s⁰ lifetime, τ(B_s⁰) = 1.444_-0.090^+0.098(stat) ± 0.020(sys) ps. We also report a measurement for the lifetime of the B⁰ meson using the exclusive decay B⁰ → J/ψ(μ⁺μ^-)K⁺⁰(892)( K⁺π^-). We reconstruct 1370 signal candidates, obtaining τ(B⁰) = 1.473_-0.050^-0.052 (stat) ± 0.023(sys) ps, and the ratio of lifetimes, τ(B_s⁰)/ τ(B⁰) = 0.980_-0.071^+0.076 (stat) ± 0.003(sys).