Eur. Phys. J. C (2014) 74: 3219
https://doi.org/10.1140/epjc/s10052-014-3219-2

Regular Article - Theoretical Physics

Searching for dark matter via mono-$$Z$$ boson production at the ILC

¹ School of Physics and Material Science, Anhui University, Hefei, 230039, Anhui, People’s Republic of China
² Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, 230026, Anhui, People’s Republic of China

^* e-mail: songmao@ahu.edu.cn

Received: 31 March 2014
Accepted: 8 December 2014
Published online: 20 December 2014

Abstract

High energy colliders provide a new unique way to determine the microscopic properties of dark matter (DM). Weakly interacting massive particles (WIMPs) are widely considered as one of the best DM candidates. It is usually assumed that the WIMP couples to the SM sector through its interactions with quarks and leptons. In this paper, we investigate the DM pair production associated with a $$Z$$ boson in an effective field theory framework at the international linear collider, which can be used to study the interactions between the DM and leptons. For illustrative purposes, we present the integrated and differential cross sections for the $$e^{+} e^{-} \rightarrow \chi \bar{\chi } Z$$ process, where the $$Z$$ boson is radiated from the initial state electron or positron. Meanwhile, we analyze the neutrino pair production in association with a $$Z$$ boson as the SM background.