Authors: HongWei Ke GuoLi Wang XueQian Li ChaoHsi Chang
Publish Date: 2010/10/27
Volume: 53, Issue: 11, Pages: 2025-2030
Abstract
The magnetic dipole transitions between the vector mesons B c and their relevant pseudoscalar mesons B c B c B c B c 2S B c 2S B c 3S B c 3S etc the binding states of c bar b system of the B c family are interesting The ‘hyperfine’ splitting due to spinspin interaction is an important topic for understanding the spinspin interaction and the spectrum of the the c bar b binding system The knowledge about the magnetic dipole transitions is also very useful for identifying the vector boson B c mesons experimentally whose masses are just slightly above the masses of their relevant pseudoscalar mesons B c Considering the possibility to observe the vector mesons via the transitions at Z 0 factory and the potential use of the theoretical estimate on the transitions we fucus our efforts on calculating the magnetic dipole transitions ie a precise calculation of the rates for the transitions such as decays B c → B c γ and B c → B c e + e − and particularly work in the BetheSalpeter framework As a typical example we carefully investigate the dependence of the rate ΓB c → B c γ on the mass difference Delta M = M B c M B c
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