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BESIII Experiment Achieves High-Precision Measurement of Charm Meson Semileptonic Decays and First Constraint on "Scalar Current"

Recently, the BESIII international collaboration utilized the world's largest near-threshold charm meson data sample to perform a combined measurement of four semileptonic decay channels: D⁰→K⁻e⁺νₑ, D⁰→K⁻μ⁺νμ, D⁺→K̄⁰e⁺νₑ, and D⁺→K̄⁰μ⁺νμ. The research team extracted the quark mixing matrix element |Vcs| with a precision better than 0.5%, determined the form factor zero-point value f₊(0) with a precision better than 0.2%, and verified lepton universality in the above processes at the 0.5% precision level. Beyond these precise determinations of Standard Model parameters, what is particularly noteworthy is that this experiment has, for the first time...

2026-09-08

BESIII Experiment First Confirms the Existence of Glueballs

On August 6, Beijing time, the international collaboration of the Beijing Spectrometer III experiment (BESIII) at the Beijing Electron-Positron Collider announced at the International Conference on High Energy Physics (ICHEP 2026) held in Brazil, in the form of a special plenary report: after 15 years of sustained research, the BESIII experiment has established a complete chain of evidence proving the existence of glueballs, unraveling the mystery that has puzzled the academic community for nearly half a century. This discovery not only provides a decisive validation of the theory of quantum chromodynamics, but also demonstrates the existence of a completely new form of matter—matter composed purely of force. Atomic nuclei are composed of protons and neutrons, which in turn are composed of quarks. Gluons mediate the strong interaction between quarks...

2026-08-06