Using the exclusive decay B0s→J/ψ(μ+μ-)ϕ(K+K-), we report the most precise single measurement of the B0s 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 B0s lifetime, τ(B0s)=1.444+0.098-0.090(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+0.052-0.050(stat)±0.023(sys) ps, and the ratio of lifetimes, τ(B0s)/τ(B0)=0.980+0.076-0.071(stat)±0.003(sys).
Physical Review Letters
- Pub Date:
- February 2005
- Bottom mesons;
- Decays of bottom mesons;
- High Energy Physics - Experiment
- 7 pages, 4 Figures, Submitted to Physical Review Letters. Minor changes after PRL referees coments