Matches in SemOpenAlex for { <https://semopenalex.org/work/W2004508906> ?p ?o ?g. }
- W2004508906 abstract "Using methods from soft-collinear and heavy-quark effective theory, a systematic factorization analysis is performed for the $bar Bto X_sgamma$ photon spectrum in the endpoint region $m_b-2E_gamma={cal O}(Lambda_{rm QCD})$. It is proposed that, to all orders in $1/m_b$, the spectrum obeys a novel factorization formula, which besides terms with the structure $H,Jotimes S$ familiar from inclusive $bar Bto X_u l,barnu$ decay distributions contains resolved photon contributions of the form $H,Jotimes Sotimesbar J$ and $H,Jotimes Sotimesbar Jotimesbar J$. Here $S$ and $bar J$ are new soft and jet functions, whose form is derived. These contributions arise whenever the photon couples to light partons instead of coupling directly to the effective weak interaction. The new contributions appear first at order $1/m_b$ and are related to operators other than $Q_{7gamma}$ in the effective weak Hamiltonian. They give rise to non-vanishing $1/m_b$ corrections to the total decay rate, which cannot be described using a local operator product expansion. A systematic analysis of these effects is performed at tree level in hard and hard-collinear interactions. The resulting uncertainty on the decay rate defined with a cut $E_gamma>1.6$ GeV is estimated to be approximately $pm 5%$. It could be reduced by an improved measurement of the isospin asymmetry $Delta_{0-}$ to the level of $pm 4%$. We see no possibility to reduce this uncertainty further using reliable theoretical methods." @default.
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- W2004508906 date "2010-08-01" @default.
- W2004508906 modified "2023-10-18" @default.
- W2004508906 title "Factorization at subleading power and irreducible uncertainties in $ bar{B} to {X_s}gamma $ decay" @default.
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- W2004508906 doi "https://doi.org/10.1007/jhep08(2010)099" @default.
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