Dineutrino modes probing lepton flavor violation

Abstract

$SU(2{)}_L$-invariance links charged dilepton $\bar{q}{q}^{\prime }{\ell }^{+}{\ell }^{-}$ and dineutrino $\bar{q}{q}^{\prime }\bar{\nu }\nu$ couplings. This connection can be established using the Standard Model Effective Field Theory framework, and allows to perform complementary experimental tests of lepton universality and charged lepton flavor conservation with flavor-summed dineutrino observables. We present its phenomenological implications for the branching ratios of rare charm decays $c\to u\nu \bar{\nu }$ and rare $B$ decays $b\to s\bar{\nu }\nu$ decays.

Comments: Contribution to Proceedings of EPS-HEP2021, 26-30 July 2021, Univ. Hamburg and DESY, 6 pages, 1 figure