Two-loop QCD Corrections to $B_c$ Meson Leptonic Decays

分类： 物理学 >> 核物理学 提交时间： 2016-09-13

Long-Bin Chen Cong-Feng Qiao

摘要： The two-loop QCD radiative corrections to the Bc meson leptonic decay rate are calculated in the framework of NRQCD factorization formalism. Two types of master integrals appearing in the calculation are obtained analytically for the first time. We get the short-distance coefficient of the leading matrix element to order α2s by matching the full perturbative QCD calculation results to the corresponding NRQCD ones. The result in this work helps the evaluation of the Bc leptonic decay constant, as well as the Cabibbo-Kobayashi-Maskawa matrix element |Vcb|, to the full next-to-next-to-leading order degree of accuracy.

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