Study of the reaction at 1.546 and 1.695 GeV/c

Remarks about spin measurements in p → Λ

“…Moreover, recent data [14] indicate values of |C zz | smaller than the published values of Ref. [2], especially above 1.9 GeV/c.…”

“…Here ϑ cm is the angle of Λ with respect top in the centre-of-mass frame. Some of these data [2] are reminded in Fig. 1, at two selected momenta.…”

The legacy of the experimental hadron physics programme at COSY

“…It was suggested that the excess of events for Q ≈ −13 MeV with a FWHM of ≈ 10 MeV in Fig. 99 might be a signal for a 25 η Mg bound state. If this were indeed the case, then the production cross section for this state is estimated to be 0.46 ± 0.16(stat) ± 0.06(syst) nb.…”

“…Thus, in the reaction pp → K + pΛ, there may initially be only two tracks, corresponding to the charged particles K + and p but, after the decay Λ → pπ − , four charged tracks can be seen in TOF. The design of COSY-TOF was certainly influenced by the experience gained with the PS185 spectrometer used at the CERN Low Energy Antiproton Ring (LEAR) [25]. In particular the technique to detect a Λ hyperon through its delayed decay was developed here.…”

“…[mb] 25. Scaled ANKE proton-proton elastic differential cross sections at 1.0, 2.0, and 2.8 GeV with statistical errors [78] compared to the SAID SP07 solution [65] and a "new" partial wave solution where the ANKE data have been taken into account.…”