CERN-PS-185-2()
HIGH PRECISION MEASUREMENT OF PBAR P --> LAMBDABAR LAMBDA CROSS-SECTIONS IN THE MASS REGION AROUND 2232 MEV/C**2
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- Proposed: Jan, 1992,
- Approved: Nov 26, 1992,
- Started: Jul, 1994,
- Completed: Jun 15, 1995
The aim of the experiment is to verify a possible structure in the excitation function of the reaction pbar p --> Lambdabar Lambda indicated by the recent threshold data of the CERN-PS-185 collaboration at an invariant mass of about 2232 MeV/c**2. Studies the total and differential cross-sections as well as polarizations and spin correlations, within a few MeV around the reaction threshold. Uses an upgraded version of the PS-185 detector. The full Lambdabar Lambda kinematics is reconstructed from tracks in a 30 cm long stack of MWPC's and drift chambers. The production vertex is reconstructed by making use of four planes of mu-strip counters upstream the CH2 sandwich target. Hyperon and antihyperon are distinguished by means of a magnetic solenoid with three drift chambers inside. The setup provides a large acceptance, a high efficiency, and a low annihilation background.
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