Measurement of the {ital {bar p}}{ital p}{r_arrow}{bar {Lambda}}{Lambda} and {ital {bar p}}{ital p}{r_arrow}{bar {Sigma}}{sup 0}{Lambda}+c.c. reactions at 1.726 and 1.771 GeV/{ital c}
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- Carnegie-Mellon University, Pittsburgh, Pennsylvania 15260 (United States)
- CERN, Geneva (Switzerland)
- Universitaet Freiburg, Freiburg (Germany)
- Institut fuer Kernphysik der KFA Juelich, Juelich (Germany)
- University of Illinois, Urbana, Illinois 61801 (United States)
- Universitaet Erlangen-Nuernberg, Nuernberg (Germany)
- Uppsala University, Uppsala (Sweden)
Interest in the production of hyperon-antihyperon pairs following antiproton-proton annihilation stems largely from attempts to understand the nature of flavor production. To date the major focus of both the experimental and the theoretical effort has been on the {ital {bar p}}{ital p}{r_arrow}{bar {Lambda}}{Lambda} reaction. In this paper, we present data on the complementary channels {ital {bar p}}{ital p}{r_arrow}{bar {Sigma}}{sup 0}{Lambda} and {ital {bar p}}{ital p}{r_arrow}{bar {Lambda}}{Sigma}{sup 0}. Events from the kinematically similar {ital {bar p}}{ital p}{r_arrow}{bar {Lambda}}{Lambda} reaction were obtained in parallel. The procedure to distinguish these three separate reactions is described and results for all channels are presented. These include the total and differential cross sections, hyperon polarizations, and spin correlation coefficients. Data were obtained at incident antiproton lab momenta of 1.726 and 1.771 GeV/{ital c} which correspond to excess kinetic energies in the {ital {bar p}}{ital p}{r_arrow}{bar {Lambda}}{Sigma}{sup 0}+c.c. reaction of 26 and 40 MeV, respectively, above threshold. Comparisons are made to earlier work at similar excess energies in the {ital {bar p}}{ital p}{r_arrow}{bar {Lambda}}{Lambda} channel. The low-energy regime has been highlighted in this experiment to reduce the complexity in the theoretical analysis. {copyright} {ital 1996 The American Physical Society.}
- DOE Contract Number:
- FG02-87ER40315
- OSTI ID:
- 397679
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 54; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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