Nuclear Physics A

Resonances and Λ0 polarization in 800 GeV/c pp → pdif fracted Λ0 K +

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Λ0 polarization from pp → pdiffractedΛ0K+ at 800 GeV/c in the average depends linearly on Λ0K+ invariant mass: Λ0 polarization is 0.635 ± 0.036 at 1.64 GeV, consistent with zero at ∼ 2.195 GeV, and -0.586±0.072 at 3.200 GeV. The origin of this Λ0 polarization is, probably, the interference of at least two Λ0K+ resonances, created from the excitation of the target proton, due to the diffracted proton transferred momentum.