News&Events

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  BESIII Sets New Bound for Sub-GeV Dark Matter Interactions The BESIII Collaboration recently reports the search for sub-GeV dark particles in η→π⁰+invisible decay and provides a new bound for the sub-GeV dark matter, which has been published in Physical Review Letters on 16th July, 2026 [Phys. Rev. Lett. 137, 031804] as PRL Editors Suggestion.
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  BESIII Reports First Measurements of Antineutron–Proton Annihilation into Multi-Pion Final States Recently, the BESIII collaboration has reported new results on antineutron–proton interactions by measuring the annihilation processes n̄ p → 2 π+ π-, n̄ p → 2 π+ π- π0, and n̄ p → 2 π+ π- 2 π0. The results have been published in Physical Review Letters (Phys. Rev. Lett. 137, 031902 (2026)).
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  Collaboration Meeting in Summer 2026, Jul. 8 - 12, 2026, Yantai University (Yantai, China) The BESIII 2026 Summer Collaboration Meeting was hosted by Yantai University and held at Crowne Plaza Yantai Sea View, Yantai, Shandong Province, China.
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  BESIII Observes Polarization and Measures Electric and Magnetic Moments of the Ξ(1530)⁰ Baryon for the First Time The BESIII Collaboration has achieved a major advance in the study of baryon structure by observing the polarization of the spin-3/2 hyperon Ξ(1530)⁰ and determining its electric and magnetic moments for the first time. The result has been published in Physical Review Letters [Phys. Rev. Lett. 137, 011901 (2026)].
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  Precise test of CP violation in neutral Λ decays The BESIII Collaboration has reported the most precise test to date of CP symmetry in the neutral decays of the Λ hyperon. The result has been published in Physical Review Letters [Phys. Rev. Lett. 136, 251802 (2026)].
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  BESIII Precisely Measures Charm Quark Chromo-Electric Dipole Moment The BESIII Collaboration has reported a new precise measurement of the chromoelectric dipole moment (CEDM) of the charm quark. The result has been published in Physical Review Letters [Phys. Rev. Lett. 136, 231903 (2026)].
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  The world’s most precise measurement on hyperfine mass splitting of charm-strange mesons The BESIII collaboration recently reported the world's most precise measurement of the hyperfine mass splitting of the strange charm mesons, based on a sample of over three million Ds*±Ds∓ pairs produced by e+e- collisions at a center-of-mass energy of 4.178 GeV with an integrated luminosity of 3.19 fb-1, and utilizing the decay chain of Ds*+→Ds+(→K+K-π+)π0. This is a sevenfold precision improvement over the current world average on the Ds*+-Ds+ mass difference. The results have been published recently in Science Bulletin on June 15, 2026 [Sci. Bull. 71 (2026) 2675].
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  BESIII reported Precise Measurement of CP Violation in Ξ⁻ Hyperon Decays The BESIII Collaboration has reported the most precise determination to date of the strong and weak phase differences in Ξ⁻ hyperon decays, along with new constraints on CP symmetry violation. The result has been published in Physical Review Letters [Phys. Rev. Lett. 136, 201802 (2026)].
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  BESIII Reports First Observation of Antihyperon–Nucleon Annihilation into Multi-Meson Final States Recently, the BESIII collaboration has achieved a significant breakthrough in the study of antihyperon–nucleon interactions by observing, for the first time, the annihilation processes of an anti-Lambda hyperon with a proton into multi-meson final states. The results of this study have been published in Physical Review Letters (Phys. Rev. Lett. 136, 171904 (2026)).
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  First Measurement of the Ds⁺→K⁰μ⁺ν_μ Decay The BESIII collaboration has reported the study of “First Measurement of the Ds⁺→K⁰μ⁺νμ Decay” and the first measurement for the semileptonic muonic decay in the Ds⁺→K⁰ transition was reported. The relevant results have been published in Physical Review Letters on 22 April 2026. [Phys. Rev. Lett. 136, 161802 (2026)].