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hep-ex2025
Search for sub-GeV invisible particles in inclusive decays of to
BESIII Collaboration, M. Ablikim, M. N. Achasov +696
A search for an invisible particle, , with a mass between 0 and 0.96 , is performed in the process using $(8774.0\pm39.4)\times…
hep-ex2025
Observation of the decay
BESIII Collaboration, M. Ablikim, M. N. Achasov +689
Using a dataset of events collected by the BESIII detector operating at the BEPCII collider, we report the first observation of the decay $…