Pandax-4T limits on $Z^{\prime }$ mass in 3-3-1LHN model

Abstract

The framework of the so-called 3-3-1LHN model may accommodate two different, but viable, scenarios of dark matter: one involving a heavy Dirac neutrino , $N_1$, or another having a scalar, $\varphi$, as dark matter candidate. In both cases the dark matter phenomenology, relic abundance and scattering cross section off of nuclei, is controlled by exchange of $Z^{\prime }$. We then investigate the impact on the parameter space $(M_{Z^{\prime }},M_{(N_1,\varphi )})$ due to the recent Pandax-4T experimental result in both scenarios. First, the Pandax-4T experiment excludes scenarios with dark matter mass below $1.9$ TeV. Concerning $Z^{\prime }$, we find the lower bound $M_{Z^{\prime }}>4.1$ TeV for the case when $N_1$ as the dark matter and $M_{Z^{\prime }}>5.7$ TeV for the other case. This implies that the 3-3-1 symmetry is spontaneously broken above $10$ TeV scale. We also comment on the contributions to the relic abundance of processes involving flavor changing neutral current mediated by $Z^{\prime }$.

arXiv comment15 pages, 8 figures, Matches version accepted in Phys. Rev. D

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