Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China
; CCAST, World Lab, Beijing 100080, Peoples R China
; Univ Adelaide, Dept Phys & Math Phys, Adelaide, SA 5005, Australia
; Univ Adelaide, Special Res Ctr Subatom Struct Matter, Adelaide, SA 5005, Australia
; Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China
Data show that tau(B)+/- similar to tau(B)0, but tau(D)+/- similar to 2 tau(D)0. The naive interpretation which attributes tau(D)+/- similar to 2 tau(D)0 to a destructive interference between two quark diagrams for DI decays definitely fails in the B case. We investigate the suggestion of Close and Lipkin that the phases for producing radially excited states psi(2s) in the decay products of B mesons can possess an opposite sign to the integrals for psi(1s) decay products. Their contributions can partially compensate each other to result in tau(B)+/- similar to tau(B)0. Since D mesons are much lighter than B mesons, such possibilities do not exist in D decays.