TY  - JOUR
AU  - Haidenbauer, Johann
AU  - Meißner, Ulf-G.
AU  - Dai, Ling-Yun
TI  - Hyperon electromagnetic form factors in the timelike region
JO  - Physical review / D
VL  - 103
IS  - 1
SN  - 2470-0010
CY  - Melville, NY
PB  - Inst.812068
M1  - FZJ-2021-00914
SP  - 014028
PY  - 2021
AB  - Electromagnetic form factors of hyperons (Λ, Σ, Ξ) in the timelike region, accessible in the reaction e+e−→¯YY, are studied. The focus is on energies close to the reaction thresholds, where the properties of these form factors are significantly influenced by the interaction in the final ¯YY system. This interaction is taken into account in the calculation, utilizing ¯YY potential models that have been constructed by the Jülich group for the analysis of data from the reaction ¯pp→¯YY in the past. The enhancement of the effective form factor for energies close to the threshold, seen in experiments of e+e−→¯ΛΛ and e+e−→¯Σ0Λ, is reproduced. With regard to the reactions e+e−→¯Σ−Σ+, ¯Σ0Σ0, ¯Σ+Σ− a delicate interplay between the three channels is observed in the results at low energies, caused by the ¯ΣΣ interaction. Predictions for the electromagnetic form factors GM and GE in the timelike region are presented for the Λ, Σ, and Ξ hyperons.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000612653000003
DO  - DOI:10.1103/PhysRevD.103.014028
UR  - https://juser.fz-juelich.de/record/890369
ER  -