Spin Transfer in Exclusive Λ Production from p-->p Collisions at 3.67 GeV/c
/ Authors
F. Balestra, Y. Bedfer, R. Bertini, L. Bland, A. Brenschede, F. Brochard, M. Bussa, V. Chalyshev, Seonho Choi, M. Dȩbowski
and 27 more authors
M. Dzemidzic, J. Faivre, I. V. Falomkin, L. Fava, L. Ferrero, J. Foryciarz, V. Frolov, R. Garfagnini, D. Gill, A. Grasso, S. Heinz, V. Ivanov, W. Jacobs, W. Kuehn, A. Maggiora, M. Maggiora, A. Manara, D. Panzieri, H. Pfaff, G. Piragino, G. Pontecorvo, A. Popov, J. Ritman, P. Salabura, F. Tosello, S. Vigdor, 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.
Journal: Physical Review Letters