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- W2005776460 abstract "We consider rare radiative B decays such as B -> K^* gamma or B -> rho gamma in soft-collinear effective theory, and show that the decay amplitudes are factorized to all orders in alpha_s and at leading order in Lambda/m_b.By employing two-step matching, we classify the operators for radiative B decays in powers of a small parameter lambda(~ sqrt{Lambda/m_b}) and obtain the relevant operators to order lambda in SCET_I. These operators are constructed with or without spectator quarks including the four-quark operators contributing to annihilation and W-exchange channels. And we employ SCET_II where the small parameter becomes of order Lambda/m_b, and evolve the operators in order to compute the decay amplitudes for rare radiative decays in soft-collinear effective theory. We show explictly that the contributions from the annihilation channels and the W-exchange channels vanish at leading order in SCET. We present the factorized result for the decay amplitudes in rare radiative B decays at leading order in SCET, and at next-to-leading order in alpha_s." @default.
- W2005776460 created "2016-06-24" @default.
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- W2005776460 date "2003-08-21" @default.
- W2005776460 modified "2023-10-09" @default.
- W2005776460 title "Rare radiative exclusive<i>B</i>decays in soft-collinear effective theory" @default.
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- W2005776460 doi "https://doi.org/10.1103/physrevd.68.034013" @default.
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