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hep-ex2025
Precision Measurement of - Mass Difference
BESIII Collaboration, M. Ablikim, M. N. Achasov +684
We measure the mass difference between and , , using the decay chain , utilizing annihi…
hep-ex2025★ 2 cited
Search for a hypothetical gauge boson and dark photons in charmonium transitions
BESIII Collaboration, M. Ablikim, M. N. Achasov +678
We report a direct search for a new gauge boson, , with a mass of , which could explain the anomalous excess of pairs observed in the n…