Measurement Of Branching Ratio And B0s Lifetime In The Decay B0s 2j Psi F0 980 At Cdf
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Measurement of Branching Ratio and B0s Lifetime in the Decay B0s 2!J/[psi] F0(980) at CDF.
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We present a study of Bs0 decays to the CP-odd final state J/[psi] f0(980) with J/[psi] 2!æ+æ- and f0(980) 2![pi]+[pi]-. Using pp̄ collision data with an integrated luminosity of 3.8 fb-1 collected by the CDF II detector at the Tevatron we measure a Bs0 lifetime of [tau](B0s 2!J/[psi] f0(980)) = 1.70-0.11+0.12(stat) " 0.03(syst) ps. This is the first measurement of the Bs0} lifetime in a decay to a CP eigenstate and corresponds in the standard model to the lifetime of the heavy Bs0 eigenstate. We also measure the product of branching fractions of B0s 2!J/[psi] f0(980) and f0(980) 2![pi]+[pi]- relative to the product of branching fractions of B0s 2!J/[psi][phi] and [phi]2!+K- to be Rf0/[psi] = 0.257 " 0.020(stat) " 0.014(syst), which is the most precise determination of this quantity to date.
Measurement of Branching Ratio and $B_s0̂$ Lifetime in the Decay $B_s0̂ \rightarrow J/\psi F_0(980)$ at CDF.
We present a study of B{sub s}° decays to the CP-odd final state J/? f0(980) with J/? →??− and f0(980) →?+?−. Using p{bar p} collision data with an integrated luminosity of 3.8 fb−1 collected by the CDF II detector at the Tevatron we measure a B{sub s}° lifetime of? (B{sub s}° → J/? f0(980)) = 1.70{sub -0.11}{sup +0.12}(stat) ± 0.03(syst) ps. This is the first measurement of the B{sub s}° lifetime in a decay to a CP eigenstate and corresponds in the standard model to the lifetime of the heavy B{sub s}° eigenstate. We also measure the product of branching fractions of B{sub s}° → J/? f0(980) and f0(980) →?+?− relative to the product of branching fractions of B{sub s}° → J/?? and? → K+K− to be R{sub f{sub 0}/?} = 0.257 ± 0.020(stat) ± 0.014(syst), which is the most precise determination of this quantity to date.
Measurement of Lifetime and Decay-Width Difference in B0s -] J/psi Phi Decays
The authors measure the mean lifetime, [tau] = 2/([Lambda]{sub L} + [Lambda]{sub H}), and the decay-width difference, [Delta][Lambda] = [Lambda]{sub L} - [Lambda]{sub H}, of the light and heavy mass eigenstates of the B{sub s}° meson, B{sub sL}° and B{sub sH}°, in B{sub s}° → J/[psi][phi] decays using 1.7 fb−1 of data collected with the CDF II detector at the Fermilab Tevatron p{bar p} collider. Assuming CP conservation, a good approximation for the B{sub s}° system in the standard model, they obtain [Delta][Lambda] = 0.076{sub -0.063}{sup +0.059}(stat.) ± 0.006(syst.) ps−1 and [tau] = 1.52 ± 0.04(stat.) ± 0.02(syst.) ps, the most precise measurements to date. The constraints on the weak phase and [Delta][Lambda] are consistent with CP conservation.