Abstract
A 4.1 event/nb sample of 11 GeV/ c K −p interactions in the LASS spectrometer at SLAC has been used in an analysis of the exclusive K s 0K s 0Λ final state. The K s 0K s 0 mass distribution exhibits a small cluster of events near threshold, but the mass spectrum is dominated by the f 2 ′(1525), which an amplitude analysis shows to be produced by both natural and unnatural parity exchange. This analysis also provides evidence for an S-wave state in the f 2 ′(1525) region, while production of the f 2(1720) is not observed. However, there is structure at ∼ 2.2 GeV/ c 2 which is similar in shape to that observed in the region of the X(2220) in radiative J/ ψ decay; an analysis of the angular distribution indicates a spin of at least 2 in this region. This, together with results from other analyses, indicates that the X(2220) may be the 2 ++ or 4 ++, mainly s s , state expected near this mass in the conventional quark model.
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