Possible explanation whyτB±∼τB0butτD±∼2τD0
作者： Hui-Shi Dong , Xin-Heng Guo , Xue-Qian Li , Rui Zhang , None
关键词: Quark 、 Physics 、 Sign (mathematics) 、 Interpretation (model theory) 、 Excited state 、 Particle physics
摘要: Data show that \tau_{B^{\pm}}\sim\tau_{B^0}, but \tau_{D^{\pm}}\sim 2\tau_{D^0}. The naive interpretation which attributes 2\tau_{D^0} to a destructive interference between two quark diagrams for D^{\pm} decays, definitely fails in the B-case. We investigate Close and Lipkin's suggestion phases producing radially excited states \psi_{2s} decay products of B-mesons can possess an opposite sign integrals \psi_{1s} products. Their contributions partially compensate each other result \tau_{B^{\pm}}\sim\tau_{B^0}. Since D-mesons are much lighter than B-mesons, such possibilities do not exist D-decays.
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