Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-06-06
Phys.Lett. B358 (1995) 129-138
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, Latex, two figures added as an uuencoded .ps file
Scientific paper
10.1016/0370-2693(95)00972-N
We calculate the contribution of the weak annihilation to the $B\rightarrow \rho\gamma$ decay amplitude by means of QCD sum rules using the photon light-cone wave function. We find that this long-distance contribution amounts to about 10\% of the leading short-distance effect in $B^-\rightarrow \rho^-\gamma$. On the other hand, weak annihilation is the dominant source of the corresponding $D$ meson decays and according to our estimates, yields branching ratios of $O(10^{-4})$ for $D^0\rightarrow \bar{K}^{*0}\gamma$, $O(10^{-5})$ for $D_s\rightarrow \rho^+\gamma$, and $O(10^{-6})$ for $D^-\rightarrow \rho^-\gamma$ and for $D^0\rightarrow \rho^0\gamma$.
Khodjamirian Alexander
Stoll Gautier
Wyler Daniel
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