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Final State Interactions and Polarization Observables in the Reaction pp → pKΛ

By Röder Matthias and Ritman James

Abstract

Due to the lack of high quality hyperon beams, final state interactions in hyperon production reactions are a compelling tool to study hyperon-nucleon interactions. The COSY-TOF experiment has recently been upgraded in order to reconstruct the pK+Λ final state with sufficient precision to determine the spin triplet pΛ scattering length with a polarized proton beam. We find an unexpected behavior of the K+ analyzing power which prevents the extraction method to be used with the available statistics. A theoretical explanation is pending. Furthermore, the polarized beam together with the self analyzing decay of the Λ allows us to determine the Λ depolarization. This is especially sensitive to K+ and π exchange in the production mechanism. Our finding verifies, to a large extent, the result from DISTO [2] that has so far been the only measurement close to the production threshold

Topics: Physics, QC1-999, Science, Q, DOAJ:Physics (General), DOAJ:Physics and Astronomy
Publisher: EDP Sciences
Year: 2012
DOI identifier: 10.1051/epjconf
OAI identifier: oai:doaj.org/article:159e819ac8004555bf5cac009e8587b8
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