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)).

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)].

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)].

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)].

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].

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)].

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)).

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)].

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)).

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)).