Acosta, D and others, Analysis of decay-time dependence of angular distributions in B/s0 --> J/psi Phi and B/d0 --> J/psi K*0 decays and measurement of the lifetime difference between B/s mass eigenstates,
Phys. Rev. Lett., vol. 94
(2005),
pp. 101803 [e101803] .
Abstract:
http://arxiv.org/abs/hep-ex/0412057