Dineutrino modes probing lepton flavor violation

TL;DR

This paper explores how $SU(2)_L$ symmetry links charged lepton processes with dineutrino interactions, enabling new tests of lepton flavor conservation through rare charm and B meson decays within the Standard Model Effective Field Theory framework.

Contribution

It establishes a theoretical connection between charged dilepton and dineutrino couplings, providing a novel approach to test lepton flavor violation in rare meson decays.

Findings

Predicted branching ratios for $c o u uar u$ decays.

Predicted branching ratios for $b o s uar u$ decays.

Framework for experimental tests of lepton universality.

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.