Constraining Ultra-Light Vector Bosons via Solar Neutrino Oscillations: The Gauged $L_{\mu }-L_{\tau }$ Model and Prospects for JUNO and XLZD

Ilídio Lopes

We present an extension of the Standard Model based upon the gauged $U(1{)}_{L_{\mu }-L_{\tau }}$ symmetry, featuring an ultra-light vector boson that couples to the difference of muon and tau…