Analysis ofK−p→Λπ+π−in the Region of theΛ(1520)
- 1 January 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 7 (1), 5-22
- https://doi.org/10.1103/physrevd.7.5
Abstract
The rate for the decay has been measured in a study of the reaction sequence . A sample of 9200 events of the type has been obtained in the Berkeley 25-in. hydrogen bubble chamber. The incident momenta range from 300 to 470 MeV/c. An energy-independent partial-wave analysis was performed using an isobar model. The model included a coherent mixture of six partial waves to describe all mass distributions, angular distributions, and the polarization of the . The decay mode was found to dominate the decay of the , in disagreement with the results of a production reaction study of the same decay. The width for the decay was measured to be 1.40 ± 0.26 MeV. Mixing between the and the has been used in the past to describe the baryons as SU(3) singlet and octet. Combining our rate for with a recently measured rate for , we calculate the mixing angle . This is in strong disagreement with the mixing angle derived from the two-body -wave decays of the singlet and octet of -25 ± 6°. Thus, some modification of the usual SU(3) description of these states needs to be made.
Keywords
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