Abstract

We show that Σ+ hyperons produced by 800 GeV/c protons on targets of Be and Cu have significant polarizations (15-20%). These polarizations persist at values of pt = 2 GeV/c and a wide range of xF. The polarizations from the Cu target are consistently less than from Be. The average ratio of the Σ+ polarization from Cu to that from Be is 0.68 ± 0.08.70111120051-112005-6Deck, L., (1983) Phys. Rev. D, 28, p. 1Heller, K., (1983) Phys. Rev. Lett., 51, p. 2025Morelos, A., Albuquerque, I.F., Baublis, V.V., (1993) Phys. Rev. Lett., 71, p. 2172Morelos, A., (1995) Phys. Rev. D, 52, p. 3777Leader, E., (2001) Spin in Panicle Physics, , Cambridge University Press, Cambridge, United KingdomSoffer, J., (1999) Hyperon 99, , edited by D. A. Jensen and E. Monnier (Fermilab, Batavia, Illinois)Lach, J., (1996) Nucl. Phys., B50, p. 216Andersson, B., Gustafson, G., Ingelman, G., (1979) Phys. Lett., 85 B, p. 417DeGrand, T.A., Miettinen, H.I., (1981) Phys. Rev. D, 24, p. 2419Szwed, J., (1981) Phys. Lett., 105 B, p. 403Hama, Y., Kodama, T., (1993) Phys. Rev. D, 48, p. 3116Lach, J., (1999) Fermilab Report No. TM-2129, , unpublishedLach, J., (2000) Fermilab Report No. TM-2128, , unpublishedRuss, J., Fermilab Proposal-0781, , unpublishedJun, S.Y., (2000) Phys. Rev. Lett., 84, p. 1857Dersch, U., (2000) Nucl. Phys., B579, p. 277Iori, M., (2001) Phys. Lett. B, 523, p. 22Kushnirenko, A., (2001) Phys. Rev. Lett., 86, p. 5243Garcia, F.G., (2002) Phys. Lett. B, 528, p. 49Eschrich, I., (2001) Phys. Lett. B, 522, p. 233Mattson, M., (2002) Phys. Rev. Lett., 89, p. 112001Molchanov, V.V., (2001) Phys. Lett. B, 521, p. 171Russ, J., (1998) ICHEP '98, 2, p. 1259. , edited by A. Astbury, D. Axen, and J. Robinson (World Scientific, Vancouver, Canada)(2000) Eur. Phys. J., C15, p. 1Timm, S., (1995) Phys. Rev. D, 51, p. 4638Vorobyov, A.A., Fermilab Proposal-0761, , unpublishedPondrom, L., (1985) Phys. Rep., 122, p. 57Kane, G.L., Pumplin, J., Repko, W., (1978) Phys. Rev. Lett., 41, p. 168

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