Quark-loop NLO corrections to pure annihilation B decays leave branching ratios nearly unchanged but significantly enhance direct and mixing-induced CP asymmetries, with Bd to phi phi reaching about -40 percent.
Study Pure Annihilation Decays $B_s^0(\bar B_s^0)\to D^{\pm}\pi^{\mp}$ in PQCD Approach
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abstract
The rare decays $B_s^0\to D^\pm \pi^\mp$ and $\bar B_s^0\to D^\mp \pi^\pm$ can occur only via annihilation type diagrams in the standard model. In this paper, we calculate branching ratios of these decays in perturbative QCD approach ignoring soft final state interaction. From our calculation, we find that their branching ratios are at $\mathcal{O}(10^{-6})$ with large CP asymmetry, which may be measured in LHC-b experiment in future.
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Enhanced Quark-Loop Contribution to Pure Annihilation Nonleptonic B-meson decays in PQCD approach
Quark-loop NLO corrections to pure annihilation B decays leave branching ratios nearly unchanged but significantly enhance direct and mixing-induced CP asymmetries, with Bd to phi phi reaching about -40 percent.