Mini Force: the (B-L) + xY gauge interaction with a light mediator

TL;DR

This paper investigates a minimal gauge extension of the Standard Model involving a light gauge boson from the U(1)_{B-L + xY} symmetry, analyzing its phenomenology, coupling properties, and experimental search strategies.

Contribution

It introduces a minimal model with a light gauge boson, detailing its axial coupling features and implications for neutrino physics and experimental detection.

Findings

The model requires only three right-handed neutrinos.

The gauge boson can have axial couplings due to hypercharge shift.

Potential experimental signatures include rare decays and parity tests.

Abstract

The relevant phenomenology and the best search schemes of a subelectroweak-scale gauge boson can be vastly different depending on its coupling. For instance, the rare decay into a light gauge boson and the high precision parity test can be sensitive if it has an axial coupling. The minimal gauge extension of the standard model with the U(1)_{B-L + xY} requires only three right-handed neutrinos, well-suited to the current neutrino mass and mixing data, and no additional exotic matter fields. We study the light gauge boson of this symmetry in detail including its axial coupling property from the hypercharge shift.