The double radiative decays B→γγ in the heavy quark limit -: art. no. 054

被引：0

作者：

Bosch, SW

Buchalla, G

机构：

[1] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst Phys, D-80805 Munich, Germany

[2] Univ Munich, Sekt Phys, D-80333 Munich, Germany

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2002年 / 08期

关键词：

B-Physics; heavy quarks physics; rare decays;

D O I：

暂无

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We analyze the double radiative B-meson decays B-s --> gammagamma and B-d --> gammagamma in QCD factorization based on the heavy-quark limit m(b) >> LambdaQCD. We systematically discuss the various contributions to these exclusive processes. The dominant effect arises from the magnetic-moment type transition b --> s(d)gamma where an additional photon is emitted from the light quark (one-particle reducible diagram). The contributions from one-particle irreducible diagrams are power suppressed. We argue that they are still calculable within QCD factorization. They are used to compute the CP-asymmetry in B --> gammagamma and to estimate so-called long-distance contributions in B and D --> gammagamma. Numerical results are presented for branching ratios and CP asymmetries.

引用

页数：19

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