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70 papers

hep-ex2026

Evidence for and observation of

BESIII Collaboration, M. Ablikim, M. N. Achasov +771

Using events collected by the BESIII detector at the BEPCII collider, the process is investigated. Evidence…

hep-ex2026

Measurement of Born Cross Section for at GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +759

Using collision data collected with the BESIII detector at the BEPCII collider corresponding to a total integrated luminosity of 44~fb, we present the first measure…

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

Proof of principle for nucleon polarization measurement at BESIII

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

A novel technique for measuring the spin polarization of final-state nucleons in a general-purpose spectrometer is validated. Using events at BESIII, the…

hep-ex2026

Observation of violation in decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1172

The LHCb collaboration measures the time‑dependent CP asymmetry in B⁰ → J/ψ ρ⁰ decays, reporting the first observation of CP violation in this channel and determining the effective…

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.