Technicolor corrections on $B_{s,d} \to γγ$ decays in QCD factorization

Details Technicolor corrections on $B_{s,d} \to γγ$ decays in QCD factorization Technicolor corrections on $B_{s,d} \to γγ$ decays in QCD factorization

2003-01-24

arxiv.org/abs/hep-ph/0301221v3

Phys.Rev. D67 (2003) 094021

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, Revtex, 9 PS/EPs figures, minor corrections, final version to appear in Phys.Rev. D

Scientific paper

10.1103/PhysRevD.67.094021

Within the framework of the Top-color-assisted Technicolor (TC2) model, we calculate the new physics contributions to the branching ratios $\calb(B_{s,d} \to \gamma \gamma)$ and CP violating asymmetries $\rcpm(B_{s,d} \to \gamma \gamma)$ in the QCD factorization based on the heavy-quark limit $m_b \gg \Lambda_{QCD}$. Using the considered parameter space, we find that (a) for both $B_s\to \gamma \gamma$ and $B_d \to \gamma \gamma$ decays, the new physics contribution can provide a factor of two to six enhancement to their branching ratios, (b) for the $B_s \to \gamma \gamma$ decay, its direct CP violation is very small in both the SM and TC2 model, and (c) the CP violating asymmetry $\rcpm(B_d \to \gamma \gamma)$ is around the ten percent level in both the SM and TC2 model, but the sign of CP asymmetry in the TC2 model is different from that in the SM.

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