Rare radiative exclusive B decays in soft-collinear effective theory

Junegone Chay, Chul Kim

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We consider rare radiative B decays such as B̄→K*γ or B→ργ in soft-collinear effective theory (SCET) and show that the decay amplitudes are factorized to all orders in αs and at leading order in ΛQCD/mb. By employing two-step matching, we classify the operators for radiative B decays in powers of a small parameter λ(∼ √ΛQCD/mb) and obtain the relevant operators to order λ in SCETI. These operators are constructed with or without spectator quarks including the four-quark operators contributing to annihilation and W-exchange channels. And we employ SCETII where the small parameter becomes of order ΛQCD./mb, and evolve the operators in order to compute the decay amplitudes for rare radiative decays in soft-collinear effective theory. We show explicitly 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 αs.

Original languageEnglish
Article number034013
JournalPhysical Review D
Volume68
Issue number3
DOIs
Publication statusPublished - 2003

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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