CERN Accelerating science

Article
Report number	CERN-PPE-96-058
Title	Observables in high-statistics measurements of the reaction $\overline{p}p$ --> $\overline{\Lambda}\Lambda$
Author(s)	Barnes, P D ; Birien, P ; Breunlich, W H ; Bröders, R ; Dennert, H ; Diebold, G ; Dutty, W ; Eisenstein, R A ; Eyrich, W ; Fischer, H ; Von Frankenberg, R ; Franklin, G ; Franz, J ; Geyer, R ; Hamann, N H ; Hauffe, J ; Hertzog, D W ; Hofmann, A ; Johansson, T ; Kilian, K ; Kirsch, M ; Kraft, R A ; Nägele, N ; Oelert, Walter ; Ohlsson, S ; Quinn, B ; Röhrich, K ; Rössle, E ; Sachs, K ; Schledermann, H ; Schmitt, H ; Schumacher, R ; Sefzick, T ; Sehl, G ; Seydoux, J ; Stinzing, F ; Tayloe, R ; Todenhagen, R ; Zeps, V ; Ziolkowski, M
Affiliation	(Carnegie-Mellon Univ. Pittsburgh) ; (Univ. Freiburg) ; (Inst. Mittelenergiephys. ÖAW Vienna) ; (Inst. Kernphys. KFA Jülich) ; (Univ. Illinois Urbana) ; (Univ. Erlangen-Nürnberg) ; (CERN) ; (Univ. Uppsala)
Publication	1996
Imprint	21 Mar 1996
Number of pages	19
In:	Phys. Rev. C 54 (1996) 1877-1886
DOI	10.1103/PhysRevC.54.1877
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LEAR ; PS185
Abstract	Associated strangeness production was studied in the $\bar{\rm p}{\rm p}\rightarrow \bar{\Lambda}\Lambda \rightarrow \bar{\rm p}\pi^{+} {\rm p}\pi^{-}$ reaction at the CERN antiproton facility LEAR using the experimental set-up of PS185. Results from two high--statistics measurements at incident antiproton momenta of $1.642$ and 1.918 GeV/$c$ are reported. Approximately 40 000 reconstructed events at each momentum have allowed us to measure the total and differential cross-sections, the spin polarizations, the spin correlations, and the singlet fractions of the $\Lambda\bar{\Lambda}$ pair. Since the decays of both the $\Lambda$ and the $\bar{\Lambda}$ were simultaneously observed in the same detector, we are able to provide upper limits on CP and CPT violation phenomena in the weak interaction.

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