QCD factorization of the four-lepton decay Martin Beneke, Philipp Böer, Panagiotis Rigatos and K. Keri Vos Eur. Phys. J. C, 81 7 (2021) 638 Published online: 21 July 2021 DOI: 10.1140/epjc/s10052-021-09388-y