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From the 6 of 111 linked papers with an AI index.

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111 papers

hep-ex2026

First Measurement of the Relative Phase between Proton Psionic Form Factors

BESIII Collaboration, M. Ablikim, M. N. Achasov +754

The relative phase between the time-like form factors of the proton is a crucial observable for a complete understanding of its internal structure, yet it has remained unmeasured d…

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

Amplitude analysis and branching fraction measurement of the decay

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

An amplitude analysis of the decay is performed to determine the relative magnitudes and phases of different intermediate processes. The analysis uses $e^…

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

Observation and branching fraction measurements of and

BESIII Collaboration, M. Ablikim, M. N. Achasov +765

Using events and events collected by the BESIII detector operating at the BEPCII collider, we report 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…