Towards UV-Models of Kinetic Mixing and Portal Matter VII: A Light Dark Photon in the $3_c3_L1_A1_B$ Model

TL;DR

This paper explores a non-abelian gauge structure linking the Standard Model and dark sector, focusing on a light dark photon within a specific $3_c3_L1_A1_B$ model, and discusses its phenomenological implications.

Contribution

It introduces a novel gauge group structure unifying SM and dark interactions, analyzing the resulting phenomenology and implications for dark photon models.

Findings

Presence of a light dark photon in the $3_c3_L1_A1_B$ model.

Potential signals for portal matter at collider experiments.

Insights into non-abelian unification of visible and dark sectors.

Abstract

The kinetic mixing (KM) portal, by which the Standard Model (SM) photon mixes with a light dark photon arising from a new $U(1)_D$ gauge group, allows for the possibility of viable scenarios of sub-GeV thermal dark matter (DM) with appropriately suppressed couplings to the SM. This KM can only occur if particles having both SM and dark quantum numbers, here termed portal matter (PM), also exist. The presence of such types of states and the strong suggestion of a need to embed $U(1)_D$ into a non-abelian gauge structure not too far above the TeV scale based on the RGE running of the $U(1)_D$ gauge coupling is potentially indicative of an enlarged group linking together the visible and dark sectors. The gauge group $G=SU(3)_c\times SU(3)_L\times U(1)_A\times U(1)_B=3_c3_L1_A1_B$ is perhaps the simplest setup wherein the SM and dark interactions are partially unified in a non-abelian fashion that is not a simple product group of the form $G=G_{SM}\times G_D$ encountered frequently in earlier work. The present paper describes the implications and phenomenology of this type of setup.