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- W2019333176 abstract "We complete the investigation of loop corrections to hard spectator-scattering in exclusive B meson to light meson transitions by computing the short-distance coefficient (jet-function) from the hard-collinear scale. Adding together the two coefficients from matching QCD to SCET_I to SCET_II, we investigate the size of loop effects on the ratios of heavy-to-light meson form factors at large recoil. We find the corrections from the hard and hard-collinear scales to be of approximately the same size, and significant, but the perturbative expansions appear to be well-behaved. Our calculation provides a non-trivial verification of the factorization arguments. We observe considerable differences between the predictions based on factorization in the heavy-quark limit and current QCD sum rule calculations of the form factors. We also include the hard-collinear correction in the B -> pi pi tree amplitudes, and find an enhancement of the colour-suppressed amplitude relative to the colour-allowed amplitude." @default.
- W2019333176 created "2016-06-24" @default.
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- W2019333176 date "2006-02-01" @default.
- W2019333176 modified "2023-10-16" @default.
- W2019333176 title "Heavy-to-light B meson form factors at large recoil energy—spectator-scattering corrections" @default.
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- W2019333176 doi "https://doi.org/10.1016/j.nuclphysb.2005.11.027" @default.
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