TY  - JOUR
AU  - Haidenbauer, Johann
AU  - Meißner, Ulf-G.
TI  - $\Lambda {\bar{\Lambda }}$ final-state interaction in the reactions $e^+e^- \rightarrow \phi {\Lambda }{\bar{{\Lambda }}}$ and $e^+e^- \rightarrow \eta {\Lambda }{\bar{{\Lambda }}}$
JO  - The European physical journal / A
VL  - 59
IS  - 6
SN  - 1434-6001
CY  - Heidelberg
PB  - Springer
M1  - FZJ-2023-02515
SP  - 136
PY  - 2023
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001018455900002
DO  - DOI:10.1140/epja/s10050-023-01017-4
UR  - https://juser.fz-juelich.de/record/1008862
ER  -