Probing light mediators in the radiative emission of neutrino pair

We propose a new possibility of using the coherently enhanced neutrino pair emission to probe light-mediator interactions between electron and neutrinos. With typical momentum transfer at the atomic \mathcal O(1,eV) scale, this process is extremely sensitive for the mediator mass range \mathcal O(10^{-3} \sim 10^4 eV. The sensitivity on the product of couplings with electron (g^eor y^e and neutrinos (g^\nuor y^\nu can touch...