The leptophilic dark matter with $Z^{\prime }$ interaction: from indirect searches to future $e^{+}{e}^{-}$ collider searches

Abstract

We investigate the scenario where the dark matter only interacts with the charged leptons in the standard model via a neutral vector mediator $Z^{\prime }$. Such a scenario with a 430 GeV dark matter can fit the recent positron fluxes observed by the AMS-02 Collaborations, with the reasonable boost factors. We study the possibility of searching such leptophilic $Z^{\prime }$ via its lepton final states and invisible decay modes at the future electron-positron colliders, such as the International Linear Collider (ILC) and the Compact Linear Collider (CLIC). We find that for the benchmark models with $Z^{\prime }$ mass from 1.0 TeV to 1.5 TeV, the searches for the invisible decays of $Z^{\prime }\to \bar{\chi }\chi$ is easily achieved at the CLIC 1.5 TeV runs via the mono-photon process. However, lighter $Z^{\prime }$ with mass from 0.5 TeV to 0.8 TeV are challenging to see. The di-lepton plus single photon channel can reveal the $Z^{\prime }$ mass at the ILC and CLIC with moderate luminosities.

arXiv commentV2: revtex4 format, 26 pages, 4 figures, results improved, Ref's added

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