Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isospin Breaking in B -> K^* gamma Decays   A calculation of the leading isospin-breaking contributions to the B -> K^*
gamma decay amplitudes based on the QCD factorization approach is presented.
They arise at order Lambda/m_b in the heavy-quark expansion and are due to
annihilation contributions from 4-quark operators, the chromo-magnetic dipole
operator, and charm penguins. In the Standard Model the decay rate for B^0 ->
K^{*0} gamma is predicted to be about 10-20 % larger than that for B^- ->
K^{*-} gamma. Isospin-breaking effects are a sensitive probe of the penguin
sector of the effective weak Hamiltonian. New Physics models in which the
hierarchy of B -> K^* gamma decay rates is either flipped or greatly enhanced
could be ruled out with more precise data.

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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an