We measure the mean lifetime, tau = 2/(Gamma_L + Gamma_H),
and the decay-width difference, Delta Gamma = Gamma_L - Gamma_H, of
the light and and heavy mass eigenstates of the B0(s) meson, B0(s)L and
B0(s)H, in B0(s) --> J/psi phi decays using 1.7 fb-1 of data collected
with the CDF II detector at the Fermilab Tevatron p anti-p collider.
Assuming CP conservation, a good approximation for the B0(s) system in
the standard model, we obtain Delta Gamma = 0.076+0.059_-0.063(stat.) +/-
0.006(syst.) ps-1 and tau = 1.52 +/- 0.04(stat.) +/-(syst.) ps, the
most precise measurements to date. Our constraints on the weak phase
and Delta Gamma are consistent with CP conservation.
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Updated: Thursday, 2008 June 19 09:37:12 CDT automatically from input from carol picciolo