Optimized lepton universality tests in $$B\rightarrow V \ell {\bar{\nu }}$$ decays Gino Isidori and Olcyr Sumensari Eur. Phys. J. C, 80 11 (2020) 1078 Published online: 20 November 2020 DOI: 10.1140/epjc/s10052-020-08653-w