摘要: The contributions from internal b-quark pair creation to the radiative transition rates of the processes Y(2S) -> X/sub b/ sup 1 + gamma and X/sub b/ sup 2 -> Y(1S)+ gamma have been estimated in a quasilocal approximation preservi... 展开 The contributions from internal b-quark pair creation to the radiative transition rates of the processes Y(2S) -> X/sub b/ sup 1 + gamma and X/sub b/ sup 2 -> Y(1S)+ gamma have been estimated in a quasilocal approximation preserving the time-dependence of the antiquark propagator and found to be smaller than 10%. Although relatively small, the pair creation correction depends sensitively on quark masses and photon energies and thus cannot be ignored in quantitative investigations of radiative quarkonium transitions. 8 references, 6 figures. (ERA citation 12:042473) 收起