Measurement of the B<sup>0</sup><sub>s</sub> lifetime in B<sup>0</sup><sub>s</sub> → K<sup>+</sup> K<sup>-</sup> decays

Abstract

A method is presented to simultaneously separate the contributions to a sample of B0s → h+h'- decays, where h = π or K, and measure the B meson lifetimes in the sample while correcting for the bias in the lifetime distributions due to the hadronic trigger at the CDF experiment. Using 1 fb -1 of data collected at CDF the B0 lifetime is measured as τB0 = 1.558-0.047+0.050stat ± 0.028syst ps, in agreement with the world average measurement. The B0s lifetime in the Bs0 → K+K- decay is measured as τB0s → K+K- = 1.51-0.11+0.13stat ± 0.04 syst ps. No difference is observed between the lifetime and other measurements of the average B0s lifetime or the lifetime of the light B0s mass eigenstate determined from B0s → J/ΨΦ decays. With the assumptions that B0s → K+K- is 100% CP-even and that τB0s = τsub B0 the width difference in the B0s system is determined as ΔΓCP/Γ = 0.03-0.15+0.17stat ± 0.05syst using the current world average B0 lifetime. This is consistent with zero and with the current world average measurement.

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