出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The mixing parameters ΔmBq of the neutral Bq− ¯Bq systems have been studied. Based on standard model, ΔmBq is related to the off-diagonal elements of the Hamiltonian corresponding to the neu- tral B-meson oscillation. Due to the large mass difference mu;c ≪mt only top quark contribution becomes dominant in this type of mixing operators. Apart from the standard model parameters involved here, the bound state parameters like the decay constant ( fP) and the bound quark mass (mb, mBq ) are determined through a potential model description of the Bq mesons. We adopt coulomb plus power type of potential of the form V(r) = −αc r +Arν with ν varying from 0.1 to 1.0. It is clear from the present study that both spectroscopy and mixing properties of Bd and Bs mesons are well described with relatively shallow potential with 0:5 ≤ν ≤ :7.
