Polarization and Forward-Backward Asymmetry of Baryons in Hadronic Z 0 Decays The OPAL Collaboration

The longitudinal polarization, the transverse polarization, and the forward-backward asymmetry of baryons, have been measured using a sample of 4.34 million hadronic Z decays collected with the OPAL detector at LEP between 1990 and 1995. These results are important as an aid to the understanding of hadronization mechanisms. Signi cant longitudinal polarization has been observed at intermediate and high momentum. For xE ( 2E = p s) > 0.3, the longitudinal polarization has been measured to be 32:9 5:5 (stat) 5.2 (syst)%. We have observed no transverse polarization. A signi cant forward-backward asymmetry has been measured and can be described by a JETSET model. (Submitted to Z. Phys. C) The OPAL Collaboration K.Ackersta , G.Alexander, J. Allison, N.Altekamp, K.J.Anderson, S.Anderson, S.Arcelli, S.Asai, D.Axen, G.Azuelos, A.H.Ball, E. Barberio, R.J. Barlow, R.Bartoldus, J.R.Batley, S. Baumann, J. Bechtluft, C.Beeston, T.Behnke, A.N.Bell, K.W.Bell, G.Bella, S. Bentvelsen, S. Bethke, O.Biebel, A.Biguzzi, S.D.Bird, V.Blobel, I.J. Bloodworth, J.E.Bloomer, M.Bobinski, P. Bock, D.Bonacorsi, M.Boutemeur, B.T.Bouwens, S. Braibant, L. Brigliadori, R.M.Brown, H.J. Burckhart, C.Burgard, R.B urgin, P.Capiluppi, R.K.Carnegie, A.A.Carter, J.R.Carter, C.Y.Chang, D.G.Charlton, D.Chrisman, P.E.L.Clarke, I. Cohen, J.E.Conboy, O.C.Cooke, M.Cu ani, S.Dado, C.Dallapiccola, G.M.Dallavalle, R.Davis, S.De Jong, L.A. del Pozo, K.Desch, B.Dienes, M.S.Dixit, E. do Couto e Silva, M.Doucet, E.Duchovni, G.Duckeck, I.P.Duerdoth, D. Eatough, J.E.G.Edwards, P.G.Estabrooks, H.G.Evans, M.Evans, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, H.M.Fischer, I. Fleck, R. Folman, D.G. Fong, M. Foucher, A. F urtjes, D.I. Futyan, P.Gagnon, J.W.Gary, J.Gascon, S.M.Gascon-Shotkin, N.I.Geddes, C.Geich-Gimbel, T.Geralis, G.Giacomelli, P.Giacomelli, R.Giacomelli, V.Gibson, W.R.Gibson, D.M.Gingrich, D.Glenzinski, J.Goldberg, M.J.Goodrick, W.Gorn, C.Grandi, E.Gross, J.Grunhaus, M.Gruw e, C.Hajdu, G.G.Hanson, M.Hansroul, M.Hapke, C.K.Hargrove, P.A.Hart, C.Hartmann, M.Hauschild, C.M.Hawkes, R.Hawkings, R.J.Hemingway, M.Herndon, G.Herten, R.D.Heuer, M.D.Hildreth, J.C.Hill, S.J.Hillier, P.R.Hobson, R.J.Homer, A.K.Honma, D.Horv ath, K.R.Hossain, R.Howard, P.H untemeyer, D.E.Hutchcroft, P. Igo-Kemenes, D.C. Imrie, M.R. Ingram, K. Ishii, A. Jawahery, P.W. Je reys, H. Jeremie, M. Jimack, A. Joly, C.R. Jones, G. Jones, M. Jones, U. Jost, P. Jovanovic, T.R. Junk, D.Karlen, V.Kartvelishvili, K.Kawagoe, T.Kawamoto, P.I.Kayal, R.K.Keeler, R.G.Kellogg, B.W.Kennedy, J.Kirk, A.Klier, S.Kluth, T.Kobayashi, M.Kobel, D.S.Koetke, T.P.Kokott, M.Kolrep, S.Komamiya, T.Kress, P.Krieger, J. von Krogh, P.Kyberd, G.D. La erty, R. Lahmann, W.P. Lai, F. Lamarche , D. Lanske, J. Lauber, S.R. Lautenschlager, J.G. Layter, D. Lazic, A.M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, A.Macchiolo, A.Macpherson, M.Mannelli, S.Marcellini, C.Markus, A.J.Martin, J.P.Martin, G.Martinez, T.Mashimo, P.M attig, W.J.McDonald, J.McKenna, E.A.Mckigney, T.J.McMahon, R.A.McPherson, F.Meijers, S.Menke, F.S.Merritt, H.Mes, J.Meyer, A.Michelini, G.Mikenberg, D.J.Miller, A.Mincer, R.Mir, W.Mohr, A.Montanari, T.Mori, M.Morii, U.M uller, S.Mihara, K.Nagai, I. Nakamura, H.A.Neal, B.Nellen, R.Nisius, S.W.O'Neale, F.G.Oakham, F.Odorici, H.O.Ogren, A.Oh, N.J.Oldershaw, M.J.Oreglia, S.Orito, J. P alink as, G. P asztor, J.R. Pater, G.N.Patrick, J. Patt, M.J. Pearce, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Po enberger, B. Poli, A. Posthaus, D.L.Rees, D.Rigby, S. Robertson, S.A.Robins, N.Rodning, J.M.Roney, A.Rooke, E.Ros, A.M.Rossi, P.Routenburg, Y.Rozen, K.Runge, O.Runolfsson, U.Ruppel, D.R.Rust, R.Rylko, K. Sachs, T. Saeki, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Schar -Hansen, P. Schenk, J. Schieck, P. Schleper, B. Schmitt, S. Schmitt, A. Schoning, M. Schroder, H.C. Schultz-Coulon, M. Schumacher, C. Schwick, W.G. Scott, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous,