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Afedulidis, O.

Publications and source records attributed to Afedulidis, O..

75 records · Page 5
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DOE OSTI2024

Measurements of Σ electromagnetic form factors in the timelike region using the untagged initial-state radiation technique

The process e + e − → Σ + Σ ¯ − is studied from threshold up to 3.04 GeV / c 2 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 / c 2 . 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. Published by the American Physical Society 2024

Astronomy & Astrophysics↗
DOE OSTI2024

Search for a muonphilic scalar X 0 or vector X 1 via J / ψ → μ + μ − + invisible decays at BESIII

A light scalar X 0 or vector X 1 particles have been introduced as a possible explanation for the ( g − 2 ) μ anomaly and dark matter phenomena. Using ( 8.998 ± 0.039 ) × 10 9 J / ψ events collected by the BESIII detector, we search for a light muon philic scalar X 0 or vector X 1 in the processes J / ψ → μ + μ − X 0 , 1 with X 0 , 1 invisible decays. No obvious signal is found, and the upper limits on the coupling g 0 , 1 ′ between the muon and the X 0 , 1 particles are set to be between 1.1 × 10 − 3 and 1.0 × 10 − 2 for the X 0 , 1 mass in the range of 1 < M ( X 0 , 1 ) < 1000 MeV / c 2 at 90% credibility level. Published by the American Physical Society 2024

Astronomy & Astrophysics↗