Using the leading order low energy effective Hamiltonian, we calculate Bc →PP (where P stands for pseudoscalar meson) decays induced by pure W-emission mechanisms. In order to estimate the hadronic matrix elements, w...Using the leading order low energy effective Hamiltonian, we calculate Bc →PP (where P stands for pseudoscalar meson) decays induced by pure W-emission mechanisms. In order to estimate the hadronic matrix elements, we apply the perturbative quantum chromodynamics (PQCD) method proposed by Szczepaniak et al. [Phys. Lett. B 243 (1990) 287] and developed by Simma et al. [Phys. Lett. B 272 (1991) 395]. Comparing with predictions of other models, we find that the PQCD method is suitable for these decays and therefore the spectator ansatz seems questionable.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19775012.
文摘Using the leading order low energy effective Hamiltonian, we calculate Bc →PP (where P stands for pseudoscalar meson) decays induced by pure W-emission mechanisms. In order to estimate the hadronic matrix elements, we apply the perturbative quantum chromodynamics (PQCD) method proposed by Szczepaniak et al. [Phys. Lett. B 243 (1990) 287] and developed by Simma et al. [Phys. Lett. B 272 (1991) 395]. Comparing with predictions of other models, we find that the PQCD method is suitable for these decays and therefore the spectator ansatz seems questionable.
