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5 papers

hep-ex2026

Unexpected large relative strong phase and search for isospin breaking and asymmetries in $J/ψ\to K^*(892)\bar K

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

Using a direct scan of 26 energy points near the resonance, we perform the first measurement of the relative phase between the strong and electromagnetic ampli…

hep-ex2026

Updated measurement of the branching fraction of

BESIII Collaboration, M. Ablikim, M. N. Achasov +703

Using a dataset of 7.33 fb of annihilation data collected with the BESIII detector at center-of-mass energies from 4.128 to 4.226 GeV, we report an updated measure…

hep-ex2026

Observation of a threshold enhancement in the spectrum in decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +677

The BESIII experiment analyzed over 2.7 billion ψ(3686) decays and observed a clear resonance-like enhancement near the π⁺π⁻ mass threshold in ψ(3686)→π⁺π⁻J/ψ decays, measuring its…

hep-ex2025

First measurement of the cross sections for at from 4.396 to 4.951 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +701

Using collision data at 19 center-of-mass energies ranging from to corresponding to a total integrated luminosity of coll…

hep-ex2025

Observation of the electromagnetic radiative decays of the \boldmath{} and \boldmath{} to \boldmath{}

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

Using events collected with the BESIII detector, we report the first observation of the electromagnetic radiative decays of the and $Λ(…