Abstract
We study theΛ formation cross sections andΛ polarizations based on the Regge pole amplitudes in theπ −+12C→Λ+X(inclusive) reactions and the exclusive kaon channel reactions atp π =4 GeV/c. We found that the experimental data of inclusive cross sections can be reproduced qualitatively well by our calculation. As for the polarization, we have the experimental data that were reported by two different groups, although they have opposite sign and different magnitudes. Our calculated results do not agree with either set of data. We show that the sign of polarization is sensitive to the outgoingΛ kinetic energy in the inclusive reactions and to the outgoing kaon angle in the exclusive kaon channel reactions.
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References
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We express our gratitude to H. Toki, A. Manabe and his collaborators at Tsukuba for their valuable communications and discussions. We would like to acknowledge V. Pantuev from Institute for Nuclear Research (Moscow) for useful discussions. We are indebted to M. Hosoda (deceased in 1989) for his continuous encouragement and useful discussions about the Regge-pole model. We would like to thank D. Hirata for useful comments. A part of this work is supported by the Special Researchers' Basic Science Program at RIKEN.