3 papers
hep-ex2025
Observation of the -annihilation process and measurement of in decays
BESIII Collaboration, M. Ablikim, M. N. Achasov +650
We present the first amplitude analysis and branching fraction measurement of the decay , using collision data collected with the BESIII detector…
hep-ex2025
Study of the electromagnetic Dalitz decay
BESIII Collaboration, M. Ablikim, M. N. Achasov +640
We report the first measurement of the di-electron invariant mass dependent transition form factor in the electromagnetic Dalitz decay using $(10087 \pm 44) \ti…
hep-ex2024
Search for the massless dark photon with and
BESIII Collaboration, M. Ablikim, M. N. Achasov +653
Using of collision data collected at GeV with the BESIII detector at the BEPCII collider, we search for the massless dark photon with t…