The ZZ' kinetic mixing in the light of the recent direct and indirect dark matter searches

TL;DR

This paper constrains the kinetic mixing between an extra U'(1) gauge symmetry and hypercharge in the Standard Model, using recent experimental data from dark matter searches, significantly narrowing the viable parameter space.

Contribution

It provides updated constraints on the kinetic mixing parameter considering recent accelerator, direct, and indirect dark matter detection data.

Findings

Allowed parameter space is now very narrow near the resonance region where M_{Z_D} ≈ 2 m_{DM}

Constraints from multiple experiments strongly limit the kinetic mixing values

The viable models must satisfy both dark matter relic density and experimental bounds.

Abstract

Several constructions, of stringy origins or not, generate abelian gauge extensions of the Standard Model (SM). Even if the particles of the SM are not charged under this extra $U'(1)$, one cannot avoid the presence of a kinetic mixing between $U'(1)$ and the hypercharge $U_Y(1)$. In this work, we constraint drastically this kinetic mixing, taking into account the recent experimental data from accelerator physics, direct detection and indirect detection of dark matter. We show that the region respecting WMAP and experimental constraints is now very narrowed along the pole line where $M_{Z_D}\simeq 2 m_{DM}$, $Z_D$ being the gauge boson associated to the extra $U'(1)$.