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49 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

Search for an isoscalar partner of the in

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

Using a data sample corresponding to an integrated luminosity of 20.3 fb collected at center-of-mass energies from 4.18 to 4.95 GeV with the BESIII detector, we observe the…

hep-ex2026

First Observation of and Determination of the Branching Fraction of

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

Using 20.3~fb of annihilation data collected at a center-of-mass energy of 3.773~GeV with the BESIII detector, we report the first observation of the semileptonic d…

hep-ex2026

Observation of Polarization and Determination of Its Electric and Magnetic Moments in

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

The BESIII experiment observed the polarization of the hyperon Ξ(1530)^0 in ψ(3686)→Ξ(1530)^0 anti‑Ξ(1530)^0 decays and measured its electric and magnetic multipole moments via ang…

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

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…