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Constraining Dark Matter Models with a Light Mediator at the PandaX-II Experiment.

Xiangxiang Ren1, Li Zhao1, Abdusalam Abdukerim2

  • 1INPAC and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.

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PandaX-II data constrains dark matter models with light mediators. New limits are set on dark matter-nucleon cross sections, impacting self-interacting dark matter parameter space.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Cosmology

Background:

  • Dark matter remains undetected, prompting searches for its particle nature.
  • Light mediators are proposed to connect dark matter to the Standard Model.
  • Direct detection experiments like PandaX-II probe dark matter interactions with atomic nuclei.

Purpose of the Study:

  • To search for nuclear recoil signals indicative of dark matter with a light mediator.
  • To set upper limits on the dark matter-nucleon cross section using PandaX-II data.
  • To constrain specific dark matter models, particularly self-interacting dark matter with light mediators.

Main Methods:

  • Utilized data from PandaX-II experiment (2016-2017 runs).
  • Analyzed a total exposure of 54 ton-day for nuclear recoil events.
  • Set upper limits on the zero-momentum dark matter-nucleon cross section.

Main Results:

  • Established upper limits on the dark matter-nucleon cross section, dependent on mediator mass.
  • Constrained the parameter space of self-interacting dark matter models with light mediators.
  • Provided strong limits for dark matter masses from 5 GeV to 10 TeV.

Conclusions:

  • The PandaX-II experiment provides stringent constraints on dark matter models featuring light mediators.
  • Results significantly narrow down viable parameter space for self-interacting dark matter.
  • This study advances the direct detection of dark matter and model discrimination.