The Double Radiative DecaysB→γγ in the Heavy Quark Limit | Zendy

Stefan W. Bosch | Zendy; Gerhard Buchalla | Zendy

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The Double Radiative DecaysB→γγ in the Heavy Quark Limit

Author(s) -

Stefan W. Bosch,

Gerhard Buchalla

Publication year - 2002

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2002/08/054

Subject(s) - physics , particle physics , quantum chromodynamics , factorization , radiative transfer , quark , b meson , lambda , meson , photon , limit (mathematics) , nuclear physics , quantum mechanics , algorithm , computer science , mathematical analysis , mathematics

We analyze the double radiative B-meson decays B_s -> gamma gamma and B_d ->gamma gamma in QCD factorization based on the heavy-quark limit m_b >>Lambda_QCD. We systematically discuss the various contributions to theseexclusive processes. The dominant effect arises from the magnetic-moment typetransition b -> s(d) gamma where an additional photon is emitted from the lightquark (one-particle reducible diagram). The contributions from one-particleirreducible diagrams are power suppressed. We argue that they are stillcalculable within QCD factorization. They are used to compute theCP-asymmetries in B -> gamma gamma and to estimate so-called long-distancecontributions in B and D -> gamma gamma. Numerical results are presented forbranching ratios and CP asymmetries.Comment: 20 pages, 6 figure

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