News&Events

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  BESIII Experiment Observes Threshold Enhancement Effect in Dipion System Recently, the BESIII international collaboration experiment achieved a major breakthrough in charmonium decay research by, for the first time, observing a distinct "resonance-like" structure at the dipion mass threshold. The results of this study were published on April 8, 2026 in Physical Review Letters (Phys. Rev. Lett. 136, 141902 (2026)).
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  Observation of New Radiative Decays of Excited Hyperons Λ(1520)/Λ(1690) at BESIII On April 8, 2026, the BESIII Collaboration achieved a significant breakthrough in the study of electromagnetic radiative decays of excited hyperons: for the first time, the radiative decays of the excited states Λ(1520) and Λ(1690) into a photon (γ) and a Σ⁰ particles were observed. This result has been published in Physical Review Letters (Phys. Rev. Lett. 136, 141801 (2026)).
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  Physics and Software Workshop in Spring 2026, Mar. 23-26, 2026 ,China University of Geosciences (Wuhan, China) The BESIII Physics & Software workshop in Spring 2026 was held during March 23-26th at China University of Geosciences (Wuhan, China).
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  Study of the Magnetic Dipole Transition of J/ψ → γη_c via η_c → ppbar ​ The BESIII collaboration has reported “Study of the Magnetic Dipole Transition of J/ψ → γηc via ηc → ppbar”. These results have been published in Physical Review Letters on 3rd Feb 2026 [Phys. Rev. Lett. 136, 051901 (2026)].
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  Observation of the Singly Cabibbo Suppressed Decay D⁰→b₁(1235)⁻e⁺νₑ and evidence for D⁺→b₁(1235)⁰e⁺νₑ The BESIII collaboration has reported “Observation of the Singly Cabibbo Suppressed Decay D⁰→b₁(1235)⁻e⁺νₑ and evidence for D⁺→b₁(1235)⁰e⁺νₑ”. The results have been published in Physical Review Letters on January 13, 2026. [Phys. Rev. Lett. 136, 021801 (2026)].
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  Collaboration Meeting in Winter 2025, Nov. 30- Dec. 5, IHEP The Collaboration Meeting in Winter 2025 was held at IHEP from 30th November to 5th December, 2025. This was a hybrid meeting held in person and also online via ZOOM.
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  Spinning hyperons reveal their inner secrets - new measurement by the BESIII collaboration Spinning hyperons reveal their inner secrets - new measurement by the BESIII collaboration
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  Observation of D⁺→ K_S⁰π⁰μ⁺ν_μ, Test of Lepton Flavor Universality and First Angular Analysis of D⁺→K^*(892^)0barl⁺ν_l The BESIII collaboration has reported “Observation of D+→ KS0π0μ+νμ,, Test of Lepton Flavor Universality and First Angular Analysis of D+→K*(892)0barl+νl”. These results have been published in Physical Review Letters on October 21, 2025. [Phys. Rev. Lett. 135, 171801 (2025)].
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  Single Inclusive 𝜋^± and 𝐾^± Production in 𝑒⁺⁢𝑒⁻ Annihilation
  The BESIII collaboration has founded the validity of isospin symmetry in parton fragmentation processes through measurements of single inclusive π± and K± production. The results were published in Physical Review Letters on Oct. 8, 2025 [Phys. Rev. 135, 151901 (2025)].
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  First measurement of ratio for ϕ meson decays into K_S⁰ K_L⁰ and K⁺ K^- through amplitude analysis of D_S⁺→K_S⁰ K_L⁰ π⁺ The BESIII collaboration has reported the ratio of ϕ meson decays into KS0 KL0 and K+ K- in charm meson decays for the first time. The results have been published in Physics Review Letters on 15 October 2025 [Phys. Rev. Lett. 135, 161902 (2025)].