Decay properties of beauty and charm mesons within Isgur–Wise function formalism C. W. Xiao, S. Rahmani and H. Hassanabadi Eur. Phys. J. Plus, 136 10 (2021) 1083 Published online: 28 October 2021 DOI: 10.1140/epjp/s13360-021-02088-2