The process eþe− → Σ+Σ ̄− is studied from threshold up to 3.04 GeV/c2 via the initial-state radiation technique using data with an integrated luminosity of 12.0 fb−1, collected at center-of-mass energies between 3.773 and 4.258 GeV with the BESIII detector at the BEPCII collider. The pair production cross sections and the effective form factors of Σ are measured in eleven Σ+Σ ̄− invariant mass intervals from threshold to 3.04 GeV/c2. The results are consistent with the previous results from Belle and BESIII. Furthermore, the branching fractions of the decays J=ψ → Σ+Σ ̄− and ψ(3686) → Σ+Σ ̄− are determined and the obtained results are consistent with the previous results of BESIII.
Measurements of Σ electromagnetic form factors in the timelike region using the untagged initial-state radiation technique
Garzia, I.;Gramigna, S.;
2024
Abstract
The process eþe− → Σ+Σ ̄− is studied from threshold up to 3.04 GeV/c2 via the initial-state radiation technique using data with an integrated luminosity of 12.0 fb−1, collected at center-of-mass energies between 3.773 and 4.258 GeV with the BESIII detector at the BEPCII collider. The pair production cross sections and the effective form factors of Σ are measured in eleven Σ+Σ ̄− invariant mass intervals from threshold to 3.04 GeV/c2. The results are consistent with the previous results from Belle and BESIII. Furthermore, the branching fractions of the decays J=ψ → Σ+Σ ̄− and ψ(3686) → Σ+Σ ̄− are determined and the obtained results are consistent with the previous results of BESIII.| File | Dimensione | Formato | |
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PhysRevD.109.034029.pdf
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