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Spin Transfer in Exclusive Lambda Production from pp Collisions at 3.67 GeV/c

By DISTO Collaboration, F. Balestra, Y. Bedfer, R. Bertini, L. C. Bland, A. Brenschede, F. Brochard, M. P. Bussa, V. Chalyshev, Seonho Choi, M. Debowski, M. Dzemidzic, J. -Cl. Faivre, I. V. Falomkin, L. Fava, L. Ferrero, J. Foryciarz, V. Frolov, R. Garfagnini, D. Gill, A. Grasso, S. Heinz, V. V. Ivanov, W. W. Jacobs, W. Kuehn, A. Maggiora, M. Maggiora, A. Manara, D. Panzieri, H. -W. Pfaff, G. Piragino, G. B. Pontecorvo, A. Popov, J. Ritman, P. Salabura, F. Tosello, S. E. Vigdor and G. Zosi

Abstract

We report the first polarization transfer measurements for exclusive hyperon production reactions. The normal spin transfer coefficient DNN for pp -> p K+ Lambda is large and negative for forward Lambda production at a beam momentum of 3.67 GeV/c, a result qualitatively consistent with expectations for a mechanism dominated by kaon-exchange and rescattering. The sign of DNN is opposite to that observed in the fragmentation regime for inclusive Lambda production at much higher energies.Comment: 4 pages, including 4 figures. To be published in PR

Topics: Nuclear Experiment, High Energy Physics - Experiment
Publisher: 'American Physical Society (APS)'
Year: 1999
DOI identifier: 10.1103/PhysRevLett.83.1534
OAI identifier: oai:arXiv.org:nucl-ex/9906011

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