Constraining self-interacting dark matter with the full dataset of PandaX-II

Abstract

Self-interacting Dark Matter (SIDM) is a leading candidate proposed to solve discrepancies between predictions of the prevailing cold dark matter theory and observations of galaxies. Many SIDM models predict the existence of a light force carrier that mediate strong dark matter self-interactions. If the mediator couples to the standard model particles, it could produce characteristic signals in dark matter direct detection experiments. We report searches for SIDM models with a light mediator using the full dataset of the PandaX-II experiment, based on a total exposure of 132 tonne-days. No significant excess over background is found, and our likelihood analysis leads to a strong upper limit on the dark matter-nucleon coupling strength. We further combine the PandaX-II constraints and those from observations of the light element abundances in the early universe, and show that direct detection and cosmological probes can provide complementary constraints on dark matter models with a light mediator.

arXiv comment5 pages, 5 figures

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• Astrophysical Tests of Dark Matter Self-Interactions
• Readout electronics and data acquisition system of PandaX-4T experiment
• An Improved Bound on Accelerated Light Dark Matter
• A 500 MS/s waveform digitizer for PandaX dark matter experiments
• Observation of Radon Mitigation in MicroBooNE by a Liquid Argon Filtration System
• Constraining Dark Matter Models with a Light Mediator from CDEX-10 Experiment at China Jinping Underground Laboratory