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

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arxiv nucl-ex/9906011 v1 pith:BJZNOX4U submitted 1999-06-23 nucl-ex hep-ex

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

DISTO Collaboration: F. Balestra , Y. Bedfer , R. Bertini , L.C. Bland , A. Brenschede , F. Brochard , M.P. Bussa , V. Chalyshev
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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 G. Zosi
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classification nucl-ex hep-ex
keywords lambdaproductiontransferexclusivespinbeamcoefficientcollisions
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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.

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