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Observation of the Zcs(3985) strange four-quark meson In the March 12th, 2021 issue of Physical Review Letters, the BESIII collaboration reports the discovery of an exotic multi-quark structure, dubbed the Zcs(3985), that is produced in the process of e^+ e^-→K^+ (D_s^- D^(*0)+D_s^(*-) D^0) at an e^+ e^- center-of-mass energy of 4.68 GeV. The Zcs(3985) is observed to decay to a charged strange-charmed meson plus a neutral charmed meson, i.e., D_s^- D^(*0)+D_s^(*-) D^0, and has a mass of 3.98 GeV/c2. This is the first candidate for a tetra-quark meson containing hidden-charm with non-zero strangeness. This paper was selected as one of that issue’s and "Editors' Suggestion" and prominently featured on the APS synopsis website.
BESIII Collaboration Workshop on Data Quality and Software Held The Beijing Spectrometer III(BESIII) international collaboration held a dedicated online workshop on data quality and software from March 25-27, 2020. The workshop was organized by the physics coordinator of BESIII, Prof. Liu Beijiang and the software coordinator, Prof. Sun Shengsen, with participants from IHEP, UCAS, PKU, USTC, and overseas institutes in Italy, Sweden, etc. Prof. Yuan Changzheng, the BESIII spokesperson, made a summary report of this workshop.
White Paper on the Future Physics Programme of BESIII The BESIII Collaboration officially released a draft version of its White Paper on the Future Physics Programme of BESIII ("white paper") at on Dec. 13. Feedback on the paper from international peers will be collected for two weeks. The release of the white paper signifies a new stage for BESIII physics research and China’s experimental hadron physics research.
BESIII Observes New Leptonic Decay Mode for D Meson The BESIII collaboration has reported the world's first observation of the decay D+ → τ+ν in a newly published Physical Review Letters paper that has been highlighted by the journal as an "Editors' Suggestion.” This is the second type of pure leptonic decay of the D+ meson.