%0 Journal Article
%A Haidenbauer, Johann
%A Meißner, Ulf-G.
%T $\Lambda {\bar{\Lambda }}$ final-state interaction in the reactions $e^+e^- \rightarrow \phi {\Lambda }{\bar{{\Lambda }}}$ and $e^+e^- \rightarrow \eta {\Lambda }{\bar{{\Lambda }}}$
%J The European physical journal / A
%V 59
%N 6
%@ 1434-6001
%C Heidelberg
%I Springer
%M FZJ-2023-02515
%P 136
%D 2023
%X Near-threshold ΛΛ¯ mass spectra for the reactions e+e−→ηΛΛ¯ and e+e−→ϕΛΛ¯ are investigated with an emphasis on the role played by the interaction in the ΛΛ¯ system. A variety of ΛΛ¯ potential models is employed that have been established in the analysis of data on pp¯→ΛΛ¯ in the past. It is shown that the near-threshold enhancement observed for the two e+e− reactions can be reproduced by considering the ΛΛ¯ final-state interaction in the partial waves suggested by the helicity-angle analysis of the experiments. For e+e−→ηΛΛ¯ the same ΛΛ¯ S-wave interaction as in e+e−→ΛΛ¯ is relevant and with it a consistent description of the pertinent measurements can be achieved. It is pointed out that a nonzero threshold cross section as observed for the latter reaction is not supported by the new ηΛΛ¯ data.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001018455900002
%R 10.1140/epja/s10050-023-01017-4
%U https://juser.fz-juelich.de/record/1008862