Search for Dark-Matter-Nucleon Interactions with a Dark Mediator in PandaX-4T

Abstract

We report results of a search for dark-matter-nucleon interactions via a dark mediator using optimized low-energy data from the PandaX-4T liquid xenon experiment. With the ionization-signal-only data and utilizing the Migdal effect, we set the most stringent limits on the cross section for dark matter masses ranging from 30~$MeV/{\mathrm{c}}^2$ to 2~$GeV/{\mathrm{c}}^2$. Under the assumption that the dark mediator is a dark photon that decays into scalar dark matter pairs in the early Universe, we rule out significant parameter space of such thermal relic dark-matter model.

6 pages, 4 figures

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• PandaX-xT: a Multi-ten-tonne Liquid Xenon Observatory at the China Jinping Underground Laboratory
• Resonant or asymmetric: The status of sub-GeV dark matter
• Probing Benchmark Models of Hidden-Sector Dark Matter with DAMIC-M
• First Search for Light Dark Matter in the Neutrino Fog with XENONnT
• First Sub-MeV Dark Matter Search with the QROCODILE Experiment Using Superconducting Nanowire Single-Photon Detectors
• On the cosmology and terrestrial signals of sexaquark dark matter
• GeV-scale dark matter with $p$-wave Breit-Wigner enhanced annihilation
• Relaxing Constraints on Dark Matter Annihilation Near the Supermassive Black Hole in M87
• Light dark-matter window constrained by \boldmath$K^{+}\to {\pi }^{+}$$+$$/E$
• Exploring Four Fermion Contact Couplings of a Dark Fermion and an Electron at Hadron Colliders and Direct Detection Experiments
• Transforming a rare event search into a not-so-rare event search in real-time with deep learning-based object detection
• Dark Matter Internal Pair Production -- A Novel Direct Detection Mechanism
• New Limits on Light Dark Matter-Nucleon Scattering
• Constraining Dark Matter Models with a Light Mediator from CDEX-10 Experiment at China Jinping Underground Laboratory
• The Dark Photon: a 2026 Perspective
• Blazar-Boosted Dark Matter: Novel Signatures via Elastic and Inelastic Scattering
• First direct search for light dark matter interactions in a transition-edge sensor
• Hydrogenated carbon structures as directional sub-GeV dark matter detectors