Constraints on Dark Photon from Neutrino-Electron Scattering Experiments

TL;DR

This paper investigates constraints on a hypothetical light gauge boson called Dark Photon, associated with U(1)_{B-L}, using neutrino-electron scattering data to improve bounds on its properties.

Contribution

It provides new exclusion limits on Dark Photon coupling and mass, emphasizing the significance of interference effects in the analysis.

Findings

More stringent bounds on Dark Photon parameters are established.

Interference effects significantly impact the analysis of experimental data.

Combined data from multiple experiments enhance the constraints.

Abstract

A possible manifestation of an additional light gauge boson $A^\prime$, named as Dark Photon, associated with a group $U(1)_{\rm B-L}$ is studied in neutrino electron scattering experiments. The exclusion plot on the coupling constant $g_{\rm B-L}$ and the dark photon mass $M_{A^\prime}$ is obtained. It is shown that contributions of interference term between the dark photon and the Standard Model are important. The interference effects are studied and compared with for data sets from TEXONO, GEMMA, BOREXINO, LSND as well as CHARM II experiments. Our results provide more stringent bounds to some regions of parameter space.