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Final States with a Single Charged Particle and Visible Λ from Kn Interactions at 4.5 GeV/c

W. L. Yen*,†, A. C. Ammann, D. D. Carmony, R. L. Eisner, A. F. Garfinkel, L. J. Gutay, S. L. Kramer, and D. H. Miller

  • Department of Physics, Purdue University, Lafayette, Indiana 47907

  • *A dissertation based on this work has been submitted to Purdue University in partial fulfillment of the requirements for the Ph.D. degree.
  • Now at Purdue University, Indianapolis Campus.
  • Now at Brookhaven National Laboratory.

Phys. Rev. 188, 2011 – Published 25 December, 1969

DOI: https://doi.org/10.1103/PhysRev.188.2011

Abstract

The results presented in this paper were obtained from an analysis of 372 000 Kd bubble-chamber pictures at an incident K momentum of 4.48 GeV/c. This paper reports the results on two-body final states, such as πΛ, πΣ0, ρΛ, πΣ0(1385), π0Σ(1385), πN(980)Λ, ηΣ(1385). The polarization of the Λ hyperon in the reaction KnπΛ has been determined and compared with the double-Regge-pole model of Reeder and Sarma. The polarization is large and remains more or less constant. No change in sign was observed, in contrast with the prediction of the model of Reeder and Sarma. A common feature of the observed two-body final states is that their production process is dominated by a peripheral mechanism which arises from meson exchange processes. The exchange mechanism for the reaction KnρΛ was investigated in terms of the density matrix formalism. It was found that more than one exchange contributes to the production of this final state. The πN(980) meson was observed in the reaction KnπNΛ. The decay mode observed was πNπη. The mass observed is 0.98±0.01 GeV with a width of 0.06±0.03 GeV.

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