Topcolor-Assisted Technicolor and the Decay Bc → Ds*γ |
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| Authors: | CAO YiGang JIAO ZhengKuan LU GongRu XIAO ZhenJun |
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| Affiliation: | 1. Department of Physics, Zhejiang University, Hangzhou 310027, China;2. Physics Department, Henan Normal University, Xinxiang 453002, China |
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| Abstract: | Applying the perturbative QCD method, we study the process Bc → Ds*γ in the topcolor-assisted technicolor model (TATCM), and compare the results with those estimated in the standard model (SM). There are two mechanisms which contribute to the Bc → Ds*γ process. One proceeds through the short distance b → sγ transition, the other through weak annihilation accompanied by a photon emission. The contribution of weak annihilation is found to be much more important than that of tlie electromagnetic penguin in the TATCM, and the branching ratio, BR (Bc → Ds*γ), is much smaller than that in the SM. |
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| Keywords: | topcolor-assisted technicolor perturbative QCD |
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