The electromagnetic form factors of the Λ in the timelike region

The reaction e(+)e(-) -> Lambda(Lambda) over tilde is investigated for energies close to the threshold. Specific emphasis is put on the role played by the interaction in the final Lambda(Lambda) over tilde system which is taken into account rigorously. For that interaction a variety of Lambda(Lambda) over tilde potential models is employed that have been constructed for the analysis of the reaction (p) over barp -> Lambda(Lambda) over tilde in the past. The enhancement of the effective form factor for energies close to the Lambda(Lambda) over tilde threshold, seen in pertinent experiments, is reproduced. Predictions for the Lambda electromagnetic form factors G(M) and G(E) in the time like region and for spin-dependent observables such as spin-correlation parameters are presented. (C) 2016 The Author(s). Published by Elsevier B.V.