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 ($V_Q=J/\ddot{I}ˆ,\ddot{I}{ˆ}^{\prime },\hat{I}\yen (nS)$) decays into neutrino pairs, considering both Dirac and Majorana types, within the Standard Model (S…