A search for two-component Majorana dark matter in a simplified model using the full exposure data of PandaX-II experiment

TL;DR

This paper reports a search for two-component Majorana dark matter using PandaX-II data, setting constraints on model parameters and excluding large regions of parameter space through direct detection and collider results.

Contribution

First search for two-component Majorana dark matter in a simplified vector mediator model using full PandaX-II data, providing new constraints on parameter space.

Findings

No significant excess observed in data.

Strong constraints placed on mediator and dark matter masses.

Large parameter space excluded by combining direct detection and collider results.

Abstract

In the two-component Majorana dark matter model, one dark matter particle can scatter off the target nuclei, and turn into a slightly heavier component. In the framework of a simplified model with a vector boson mediator, both the tree-level and loop-level processes contribute to the signal in direct detection experiment. In this paper, we report the search results for such dark matter from PandaX-II experiment, using total data of the full 100.7 tonne$\cdot$day exposure. No significant excess is observed, so strong constraints on the combined parameter space of mediator mass and dark matter mass are derived. With the complementary search results from collider experiments, a large range of parameter space can be excluded.