Abstract

We present a study of the decay Bs0→J/ψϕ. We obtain the CP-odd fraction in the final state at time zero, R⊥=0.16±0.10(stat)±0.02(syst), the average lifetime of the (Bs0, B¯s0) system, τ¯(Bs0)=1.39−0.16+0.13(stat)−0.02+0.01(syst) ps, and the relative width difference between the heavy and light mass eigenstates, ΔΓ/Γ¯≡(ΓL−ΓH)/Γ¯=0.24−0.38+0.28(stat)−0.04+0.03(syst). With the additional constraint from the world average of the Bs0 lifetime measurements using semileptonic decays, we find τ¯(Bs0)=1.39±0.06 ps and ΔΓ/Γ¯=0.25−0.15+0.14. For the ratio of the Bs0 and B0 lifetimes we obtain τ¯(Bs0)τ(B0)=0.91±0.09(stat)±0.003(syst).Received 20 July 2005DOI:https://doi.org/10.1103/PhysRevLett.95.171801©2005 American Physical Society

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