News&Events

• 

  Observation of the Narrow Structure near the pΛbar Threshold The BESIII collaboration has recently reported the observation of a narrow structure near the pΛbar threshold in the e+e-→pK-Λbar+c.c. process. Its quantum number JP is determined for the first time and the resonance parameters are also determined. The detailed results have been published in the journal Physical Review Letters 131, 151901 on Oct. 10 2023.
• 

  First Experimental Study of the Weak Decay D_s^*→eν_e at BESIII The first experimental study of the weak decay Ds*→eνe with entangled Ds-Ds* pairs has been presented by BESIII collaboration. The results are published in the journal Phys. Rev. Lett. 131, 141802 (2023) on Oct. 6 2023.
• 

  BESIII Physics and Software Workshop in Autumn 2023, Sep. 19-22, JLU The BESIII Physics and Software Workshop in Autumn 2023 was held in Jilin University, Changchun, China from September 19th to 22nd, 2023.
• 

  Search for Λ-Λbar Baryon-Number-Violating Oscillations The BESIII collaboration has recently presented their results on searching for oscillations between Λbar and Λ in the decay Jpsi to p K- Λbar +c.c. This is the first constraint on the rate of hyperon-anti-hyperon oscillations. The detailed results have been published in the journal Physical Review Letters 131, 121801 on Sep. 19 2023.
• 

  The most precision test of CP symmetry in the entangled Ξ^0-Ξbar^0 pairs at BESIII The BESIII collaboration has presented the most precise measurements of asymmetry and decay parameters with entangled Ξ0-Ξbar0 pairs. The results are published in the journal Physical Review D as a Letter and an Editor’s Suggestion on Aug. 23, 2023 ( PHYSICAL REVIEW D 108, L031106 (2023)).
• 

  Collaboration Meeting in Summer 2023, Jun.26--30, HuNan University Collaboration Meeting in Summer 2023, Jun.26--30, HuNan University
• 

  First study of hyperon-nucleon reaction at an electron-positron collider The BESIII collaboration recently reported the first study of hyperon-nucleon reaction Ξ0n→Ξ-p with “Ξ0 beam” from the decay J/ψ→Ξ0 anti-Ξ0 based on 10 billion J/ψ data. This is the first study of hyperon-nucleon interaction in electron-positron collisions, and opens up a new direction for such research. The results have been published recently in Physics Review Letters on June 21, 2023 [Phys. Rev. Lett. 130, 251902 (2023)].
• 

  Precise measurement of the inclusive production of the π^0 and K_S^0 mesons BESIII recently reported its first result of the inclusive production cross sections of the neutral hadrons, i.e., the π0 and KS0 mesons, which has been published in Phys. Rev. Lett. 130, 231901 (2023) on 6 June 2023.
• 

  Precision measurements of hyperon radiative decay Σ+→pγ The BESIII collaboration has reported the first absolute branching fraction and decay asymmetry of Σ+→pγ with 10 billion J/ψ data. The measured value of the branching fraction is lower than the world average by 4.2 standard deviations. Both the branching fraction and decay asymmetry parameter are measured with the most precision to date. The results have been published recently in Physics Review Letters [Phys. Rev. Lett. 130, 211901 (2023)].
• 

  Celebration of the 500th paper submitted to journal On May 9th, 2023, BESIII Collaboration submitted the 500th paper.