Publication

Search for Sub-GeV Dark Particles in η →π0+Invisible Decay

2026

Abstract

Using (10087±44)×106 J/ψ events collected with the BESIII detector at the BEPCII collider at the center-of-mass energy of s=3.097 GeV, we report the first search for η→π0S→π0χχ¯ with S denoting an on-shell dark scalar boson and χ an invisible dark matter particle. No significant signals are observed with S mass ranging from 0 to 400 MeV/c2. The upper limits on the branching fractions and the new physics coupling strengths between S and quarks are set to be (1.8-5.5)×10-5 and (1.3-3.2)×10-5 at the 90% confidence level, respectively. The constraints on the dark-matter-nucleon scattering cross section is improved by approximately five orders of magnitude over previous dark-matter-nucleon scattering experiments, providing unique insights into sub-GeV dark matter.

Official source

https://infoscience.epfl.ch/entities/publication/a0bc530a-378c-47e8-b0f4-0e7fa144ce7d

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a0bc530a-378c-47e8-b0f4-0e7fa144ce7d

About this result

Related concepts (32)

Weakly interacting massive particle

Weakly interacting massive particles (WIMPs) are hypothetical particles that are one of the proposed candidates for dark matter. There exists no formal definition of a WIMP, but broadly, it is a new elementary particle which interacts via gravity and any other force (or forces), potentially not part of the Standard Model itself, which is as weak as or weaker than the weak nuclear force, but also non-vanishing in its strength.

Dark matter

Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. Dark matter is called "dark" because it does not appear to interact with the electromagnetic field, which means it does not absorb, reflect, or emit electromagnetic radiation and is, therefore, difficult to detect. Various astrophysical observations - including gravitational effects which cannot be explained by currently accepted theories of gravity unless more matter is present than can be seen - imply dark matter's presence.

Baryogenesis

In physical cosmology, baryogenesis (also known as baryosynthesis) is the physical process that is hypothesized to have taken place during the early universe to produce baryonic asymmetry, i.e. the imbalance of matter (baryons) and antimatter (antibaryons) in the observed universe. One of the outstanding problems in modern physics is the predominance of matter over antimatter in the universe. The universe, as a whole, seems to have a nonzero positive baryon number density.

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Search for Sub-GeV Dark Particles in η →π0+Invisible Decay

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