Abstract
The polarization of\(\Lambda ^0 , \overline \Lambda ^0 , \Sigma ^ + \) andΘ − inclusively produced inσ } induced interactions at 330 GeV has been measured in the experiment WA89 at CERN. This is the first measurement of polarization of baryons produced by an unpolarized hyperon beam. No polarization of\( \overline \Lambda ^0 \) is observed, as was also the case in proton beam data. At transverse momenta of about 1 GeV/c Λℴ and Σ+ show little polarization, significantly lower than in the proton beam data, whileΘ − have a polarization comparable to the polarization of Λ0 produced in proton beams.
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Supported by the Bundesministerium für Forschung und Technologie, Germany, under contract numbers 05 5HD15I, 06 HD5241 and 06 MZ5265
We are indebted to J. Zimmer and the late Z. Kenesei for their help during all moments of detector construction and set-up. We are grateful to the staff of CERN's EBS group for providing an excellent hyperon beam channel, to the staff of CERN's Omega group for their help in running the Ω-spectrometer and also to the staff of the SPS for providing good beam conditions. We thank G. Gustafson for a helpful discussion.
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Adamovich, M.I., Albertson, E., Alexandrov, Y.A. et al. Measurement of the polarization of\(\Lambda ^0 , \overline \Lambda ^0 , \Sigma ^ + \) and Ξ− produced in a Σ− beam of 330 GeV/c. Z. Physik A - Hadrons and Nuclei 350, 379–386 (1995). https://doi.org/10.1007/BF01291194
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DOI: https://doi.org/10.1007/BF01291194