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- W2100087452 abstract "We compute the QCD form factor resumming threshold logarithms in B→Xc+l+νl decays to next-to-leading logarithmic approximation. We present an interpolation formula including soft as well as collinear effects softened by the non-vanishing charm mass which, in the N-space, reads: σN=exp∫01dy[(1−y)N−1−1]{1y∫Q2y21+ρQ2y2y+ρA[ρ;αS(k2)]dk2k2+1yD[αS(Q2y21+ρ)]+(1y−1y+ρ)Δ[αS(Q2y2y+ρ)]+1y+ρB[αS(Q2y2y+ρ)]}, where y=(mXc2−mc2)/(Q2−mc2), ρ=mc2/(Q2−mc2) and Q=EXc+|p→Xc|. The function A(ρ;αS) describes soft radiation collinearly enhanced off the charm quark and reduces to the standard double-logarithmic function A(αS) in the massless limit ρ→0. The function B(αS) describes hard collinear emission off the charm quark, being the standard jet function. D(αS) and Δ(αS) describe soft radiation not collinearly enhanced off the beauty and the charm quark respectively." @default.
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- W2100087452 date "2007-09-01" @default.
- W2100087452 modified "2023-09-23" @default.
- W2100087452 title "Threshold resummation in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif overflow=scroll><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:msub><mml:mi>X</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mi>l</mml:mi><mml:msub><mml:mi>ν</mml:mi><mml:mi>l</mml:mi></mml:msub></mml:math> decays" @default.
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- W2100087452 doi "https://doi.org/10.1016/j.physletb.2007.07.041" @default.
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