Probing light mediators at ultra-low threshold energies with coherent elastic neutrino-nucleus scattering

Understand

Light neutral mediators, with mass $\lesssim 1$ GeV, are common features of extensions to the Standard Model (SM).

• Current astrophysical and terrestrial experiments have constrained the model parameter space, and planned experiments around the world promise continued improvement in sensitivity.
• In this paper we study the prospects for probing light neutral mediators using terrestrial stopped pion and reactor sources in combination with ultra-low threshold nuclear and electron recoil detectors.
• We show that the coherent neutrino-nucleus and neutrino-electron scattering channels provide complementary sensitivity to light mediators.