News&Events

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  Evidence of a new subatomic particle The BESIII collaboration recently reported the observation of an anomalous line shape around ppbar mass threshold in the J/ψ→γ3(π+π-) decay, which indicates the existence of a ppbar bound state. This paper has been published online in Physical Review Letters on April 9, 2024. [Phys. Rev. Lett. 132,151904 (2024)]
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  Observation of the pure W-emission decay D+ -> KS0a0(980)+ The BESIII collaboration recently reported “Observation of D+ -> KS0a0(980)+ in the amplitude analysis of D+ -> KS0π+η”, which has been published in Physical Review Letters on March 2024 [Phys. Rev. Lett., 132, 131903 (2024)].
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  Understanding the nature of f0(980) in the Ds semileptonic decay BESIII collaboration has reported the first hadronic form factor measurement of the semileptonic decay D_s^+→f_0 (980)e^+ ν_e with f_0 (980)→π^+ π^- and the first search of the decay D_s^+→f_0 (500)e^+ ν_e with f_0 (500)→π^+ π^-. These results have been published in Physical Review Letters on 05 April 2024. [Phys. Rev. Lett. 132,141901(2024)].
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  Discovery of the SU(3)-breaking effect in kaon wave function and first observation of ψ(3770) charmless decays to K_S^0 K_L^0 BESIII Collaboration has precisely measured the effect of different quarks on the wave function of kaon and reported the first observation of ψ(3770) charmless decays to K_S^0 K_L^0. This research has been published in Physics Review Letters on Mar. 25th, [Phys. Rev. Lett. 132, 131901 (2024)].
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  Physics and Software Workshop in Spring 2024, Mar. 18-21, 2024, IHEP The BESIII Spring Workshop in 2024 had been held at IHEP from Mar.18th to Mar. 21st, 2024. This was a hybrid meeting held in person and also online via ZOOM.
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  Disparity in Λ decay that reveals ΔI =1/2 rule The BESIII collaboration recently reported “Investigation of the ΔI = 1/2 rule and test of CP symmetry through the measurement of decay asymmetry parameters in Ξ- decays”, which has been published in Physical Review Letters on 06 March 2024 [Phys. Rev. Lett. 132, 101801 (2024)].
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  Observation of D_s^+→η^' μ^+ ν_μ, Precision Test of Lepton Flavor Universality with D_s^+→η^((')) l^+ ν_l, and First Measurements of D_s^+→η^((')) μ^+ ν_μ Decay Dynamics The BESIII collaboration has reported the observation of Ds+→η' μ+νμ, precision test of lepton flavor universality with Ds+→η(') l+ νl, and first measurements of Ds+→η(') μ+ νμ decay dynamics. These results have been published in Physical Review Letters on 28 February 2024. [Phys. Rev. Lett. 132, 091802 (2024)].
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  Complete determination of Σ^+ hyperon electromagnetic form factors in timelike region The BESIII collaboration recently reported “Determination of the Σ+ timelike electromagnetic form factors”, which has been published in Physical Review Letters on Feb. 22, 2024 [Phys. Rev. Lett. 132, 081904 (2024)].
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  First measurement of the decay asymmetry in the pure W-boson-exchange decay Λ_c^+→Ξ^0 K^+ In the January 17, 2024 issue of Physical Review Letters（Phys. Rev. Lett. 132, (2024) 031801）, the BESIII Collaboration reported the first measurement of the decay asymmetry in the pure W-boson-exchange decay Λc+→Ξ0 K+. The decay asymmetry parameter, α, is measured to be 0.01±0.16 (stat.)±0.03(syst.), and Δ is measured to be 3.84±0.90 (stat.)±0.17(syst.). Meanwhile, the other two decay asymmetry parameters, β and γ, and also dynamics parameters are also derived in this process.
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  Collaboration Meeting in Winter 2023, Dec.4- 8, 2023, Sun Yat-Sen University The BESIII Collaboration Meeting in Winter 2023 will be held at Sun Yat-Sen University (Shenzhen Campus) from Dec. 4th to Dec. 8th, 2023.