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arXiv · 1308.6114

Light-Cone Distribution Amplitudes for Heavy-Quark Hadrons

Guido Bell·Thorsten Feldmann·Yu-Ming Wang·Matthew W Y Yip
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Abstract

We construct parametrizations of light-cone distribution amplitudes (LCDAs) for B-mesons and Lambda_b-baryons that obey various theoretical constraints, and which are simple to use in factorization theorems relevant for phenomenological applications in heavy-flavour physics. In particular, we find the eigenfunctions of the Lange-Neubert renormalization kernel, which allow for a systematic implementation of renormalization-group evolution effects for both B-meson and Λ_b-baryon decays. We also present a new strategy to construct LCDA models from momentum-space projectors, which can be used to implement Wandzura-Wilczek--like relations, and which allow for a comparison with theoretical approaches that go beyond the collinear limit for the light-quark momenta in energetic heavy-hadron decays.

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Guido Bell, Thorsten Feldmann, Yu-Ming Wang, Matthew W Y Yip. 2013-08-28. Light-Cone Distribution Amplitudes for Heavy-Quark Hadrons. https://doi.org/10.1007/jhep11(2013)191

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