Title: Light $U(1)_{B-L}$ model at the high-intensity frontier
Speaker: Yongchao Zhang (Southeast University)
Abstract: The low-energy $U(1)_{B-L}$ model is a well-motivated framework to account for the tiny neutrino masses. The light scalar ($\varphi$) and gauge ($Z’$) bosons in this model can be searched for in some high-intensity experiments. At the DUNE experiment, the gauge coupling of $\varphi$ to $Z’$ could improve significantly the $Z’$ prospects, even by one order of magnitude. The $Z’$ can also induce important interference effect for $\nu - e$ scattering at DUNE. Through mixing with the SM $Z$ boson, the light $Z’$ boson contributes to the low-energy high-precision P2 experiment, which is designed to measure the weak mixing angle in $e+p$ or $e + ^{12}$C scattering. If sufficiently light, these light particles in the $U(1)_{B-L}$ models can also be produced abundantly in the supernova cores and neutron star mergers, and the corresponding astrophysical observations could provide some constraints on the couplings of these light particles.