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Nuclear Physics Seminars
Tuesday, September 30, 2003
Physics Building, Room 204
[Host: Donal Day]
Department of Physics and Astronomy, University of New Mexico
"P+PBAR -> LAMBDA+LAMBDABAR WITH A POLARIZED TARGET"
The reaction p+pbar -> lambda+lambdabar was examined by CERN
experiment PS185/3 at the Low-Energy Antiproton Ring (LEAR) with beam
momenta of 1.525 GeV/c and 1.640 GeV/c. The proton target was
transversely polarized to enable measurements of the depolarization
and spin transfer, which quantify the transfer of the transverse spin
of the target proton to that of the outgoing lambda and lambdabar,
respectively. Theoretical calculations of Dnn, the component of the
depolarization normal to the production plane, differ greatly
according to whether quark-gluon or meson-exchange models are utilized.
Final results for the measured depolarization Dnn and spin transfer
Knn will be presented for both beam momenta. These results appear to
be inconsistent with the specific angular distributions predicted
under the assumptions of both production scenarios.
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