QCD factorization approach for rare $\bar B^0\to D^*γ$ decay

Details QCD factorization approach for rare $\bar B^0\to D^*γ$ decay QCD factorization approach for rare $\bar B^0\to D^*γ$ decay

2007-08-17

arxiv.org/abs/0708.2393v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

We present the estimate of the branching ratio for the rare decay $\bar B^0\to D^*\gamma$. We use QCD factorization approach in order to compute the amplitude of the process. The calculation is carried out with the leading order accuracy. % Our consideration is based on the % factorization for the amplitude of the process which % has been derived with the leading order accuracy. The appearing non-perturbative matrix elements have been estimated using the large$-N_c$ limit and QCD sum rule approach. We obtained that $\mathcal{B}(\bar B^0\to D^*\gamma)\simeq 1.52\times 10^{-7}$. Such value of the branching fraction is too small in order to be measured at present experiments.

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