Search for structure in $pi$$sup -$p $Yields$ $lambda$K threshold

Abstract

We have measured the cross section, the angular distribution, and the lambda polarization for the reaction *-p + AK'.A spark chamber spectrometer was used to collect 8400 AK' events at 14 beam momenta near EK threshold.Our data do not show the prominent cross section enhancement suggested by some previous experiments.However, detailed structure in the cross section and the angular distribution agrees well with a simple model which includes a cusp effect at EK threshold.

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