Constraints on light vector mediators through coherent elastic neutrino nucleus scattering data from COHERENT

TL;DR

This paper uses recent COHERENT experiment data to set new constraints on light vector Z' mediators in various models, improving limits on their mass and coupling.

Contribution

It provides the first constraints on light vector mediators from COHERENT CEvNS data for multiple models, comparing with other experimental bounds.

Findings

COHERENT data impose stringent limits on Z' mass and coupling.

Constraints are competitive with fixed target, accelerator, solar, and reactor experiments.

Results impact models explaining the muon g-2 anomaly.

Abstract

We present new constraints on three different models, the so-called universal, $B-L$ and $L_\mu-L_\tau$ models, involving a yet to be observed light vector $Z'$ mediator, by exploiting the recent observation of coherent elastic neutrino-nucleus scattering (CE$\nu$NS) in argon and cesium-iodide performed by the COHERENT Collaboration. We compare the results obtained from a combination of the above data sets with the limits derived from searches in fixed target, accelerator, solar neutrino and reactor CE$\nu$NS experiments, and with the parameter region that could explain the anomalous magnetic moment of the muon. We show that for the universal and the $B-L$ models, the COHERENT data allow us to put stringent limits in the light vector mediator mass, $M_{Z'}$, and coupling, $g_{Z'}$, parameter space.