Invisible decays of vector Charmonia and Bottomonia to determine the Weak Mixing Angle at quarkonia scale

G. Hernández-Tomé, C. S. Kim, G. López Castro

We compute the branching fractions of vector quarkonia ($V_Q=J/\psi ,{\psi }^{\prime },{\rm Y}(nS)$) decays into neutrino pairs, considering both Dirac and Majorana types, within the Standard Model (SM)…