Measurements of production polarization and decay asymmetry for - Hyperons

R. Rameika, A. Beretvas, L. Deck, T. Devlin, K. B. Luk, R. Whitman, P. T. Cox, E. C. Dukes, J. Dworkin, O. E. Overseth, R. Handler, B. Lundberg, L. Pondrom, M. Sheaff, C. Wilkinson, K. Heller

Research output: Contribution to journalArticlepeer-review

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Abstract

The polarization of - hyperons produced by 400-GeV protons in the reaction p+Be-+X has been measured as a function of momentum at two production angles. The average polarization for the full sample (192 110 events) was -0.108±0.007. Comparisons are made with polarization measurements for other hyperons produced under similar conditions. From the same data, was measured to be -0.303±0.004±0.004, where ± is the asymmetry parameter in the decay p-, ± is the asymmetry parameter in the decay --, and the uncertainties are statistical and systematic, respectively. This yields ±=-0.472±0.006±0.011, where the systematic uncertainty is dominated by the uncertainty in ±. An updated test of the I=1/2 rule in decay is presented.

Original languageEnglish (US)
Pages (from-to)3172-3179
Number of pages8
JournalPhysical Review D
Volume33
Issue number11
DOIs
StatePublished - Jan 1 1986

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