Measurement of the Lifetime Difference in the B_s^0 System

Details Measurement of the Lifetime Difference in the B_s^0 System Measurement of the Lifetime Difference in the B_s^0 System

2005-07-19

arxiv.org/abs/hep-ex/0507084v1

Phys.Rev.Lett.95:171801,2005

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to Phys. Rev. Lett. FERMILAB-PUB-05-324-E

Scientific paper

10.1103/PhysRevLett.95.171801

We present a study of the decay B_s^0 -> J/psi phi We obtain the CP-odd fraction in the final state at time zero, R_perp = 0.16 +/- 0.10 (stat) +/- 0.02 (syst), the average lifetime of the (B_s, B_sbar) system, tau (B_s^0) =1.39^{+0.13}_{-0.16} (stat) ^{+0.01}_{-0.02} (syst) ps, and the relative width difference between the heavy and light mass eigenstates, Delta Gamma/Gamma = (Gamma_L - Gamma_H)/Gamma =0.24^{+0.28}_{-0.38} (stat) ^{+0.03}_{-0.04} (syst). With the additional constraint from the world average of the B_s^0$lifetime measurements using semileptonic decays, we find tau (B_s^0)= 1.39 +/- 0.06 ~ps and Delta Gamma/\Gamma = 0.25^{+0.14}_{-0.15}. For the ratio of the B_s^0 and B^0 lifetimes we obtain tau(B_s^0)/tau(B^0)} = 0.91 +/- 0.09 (stat) +/- 0.003 (syst).

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