The LBK theorem to all orders

نویسندگان

چکیده

We study the soft limit of one-photon radiation at next-to-leading power (NLP) in framework heavy-quark effective theory (HQET) to all orders perturbation theory. establish theorem that for unpolarised scattering radiative contribution up NLP is entirely determined by non-radiative amplitude. This generalises Low-Burnett-Kroll (LBK) QED orders. All hard matching corrections can be calculated applying LBK differential operator The virtual vanish beyond one loop, resulting a one-loop exact function. As first, non-trivial application we calculate real-virtual-virtual electron-line muon-electron limit.

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ژورنال

عنوان ژورنال: Journal of High Energy Physics

سال: 2023

ISSN: ['1127-2236', '1126-6708', '1029-8479']

DOI: https://doi.org/10.1007/jhep07(2023)177