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8 papers

hep-ex2026

Measurement of the double Dalitz decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

The BESIII experiment measured the rare decay of the eta meson into two electron-positron pairs, determining its branching fraction to be about 2.6 × 10⁻⁵.

hep-ex2026

Evidence of

BESIII Collaboration, M. Ablikim, M. N. Achasov +766

We report the first evidence for the hadronic transition using a data sample of collected at ~GeV with the BESIII…

hep-ex2026

Strong and electromagnetic amplitudes, direct and isospin asymmetries in the decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +766

Using annihilation data collected at 26 center-of-mass energy points between 3000.00 and with the BESIII detector, corresponding to a total integrated…

hep-ex2026

Measurement of branching fractions of and

BESIII Collaboration, M. Ablikim, M. N. Achasov +685

By analyzing collision data corresponding to an integrated luminosity of 7.33~fb collected with the BESIII detector at center-of-mass energies ranging from 4.128 to…

hep-ex2026

Measurement of the branching fraction of

BESIII Collaboration, M. Ablikim, M. N. Achasov +684

The branching fraction of the electromagnetic Dalitz decay is measured with an collision data sample collected by the BESIII experi…

hep-ex2026

Study of in the amplitude analysis of

BESIII Collaboration, M. Ablikim, M. N. Achasov +772

We present the first amplitude analysis and branching fraction measurement of decay. The analysis uses a dataset corresponding to an in…