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000890369 1001_ $$0P:(DE-Juel1)131179$$aHaidenbauer, Johann$$b0$$eCorresponding author
000890369 245__ $$aHyperon electromagnetic form factors in the timelike region
000890369 260__ $$aMelville, NY$$bInst.812068$$c2021
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000890369 520__ $$aElectromagnetic form factors of hyperons (Λ, Σ, Ξ) in the timelike region, accessible in the reaction e+e−→¯YY, are studied. The focus is on energies close to the reaction thresholds, where the properties of these form factors are significantly influenced by the interaction in the final ¯YY system. This interaction is taken into account in the calculation, utilizing ¯YY potential models that have been constructed by the Jülich group for the analysis of data from the reaction ¯pp→¯YY in the past. The enhancement of the effective form factor for energies close to the threshold, seen in experiments of e+e−→¯ΛΛ and e+e−→¯Σ0Λ, is reproduced. With regard to the reactions e+e−→¯Σ−Σ+, ¯Σ0Σ0, ¯Σ+Σ− a delicate interplay between the three channels is observed in the results at low energies, caused by the ¯ΣΣ interaction. Predictions for the electromagnetic form factors GM and GE in the timelike region are presented for the Λ, Σ, and Ξ hyperons.
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000890369 7001_ $$0P:(DE-Juel1)131252$$aMeißner, Ulf-G.$$b1
000890369 7001_ $$0P:(DE-Juel1)168586$$aDai, Ling-Yun$$b2
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