/ Experiment-HEP hep-ex/9910062


Observation of a single spin azimuthal asymmetry in semiinclusive pion electro production


Airapetian, A. ; Akopov, N. ; Amarian, M. ; Aschenauer, E.C. ; Avakian, H. ; Avakian, R. ; Avetisian, A. ; Bains, B. ; Baumgarten, C. ; Beckmann, M. ; Belostotski, S. ; Belz, J.E. ; Benisch, T. ; Bernreuther, S. ; Bianchi, N. ; Blouw, J. ; Bottcher, H. ; Borissov, A. ; Bouwhuis, M. ; Brack, J. ; Brauksiepe, S. ; Braun, B. ; Bray, B. ; Brons, St. ; Bruckner, W. ; Brull, A. ; Bruins, E.E.W. ; Bulten, H.J. ; Capitani, G.P. ; Carter, P. ; Chumney, Pamela R.K. ; Cisbani, E. ; Court, G.R. ; Dalpiaz, P.F. ; De Sanctis, E. ; De Schepper, D. ; Devitsin, E. ; de Witt Huberts, P.K.A. ; Di Nezza, P. ; Duren, M. ; Dvoredsky, A. ; Elbakian, G. ; Ely, J. ; Fantoni, A. ; Fechtchenko, A. ; Ferstl, M. ; Fiedler, K. ; Filippone, B.W. ; Fischer, H. ; Fox, B. ; Franz, J. ; Frullani, S. ; Funk, M.A. ; Garber, Y. ; Gao, H. ; Garibaldi, F. ; Gavrilov, G. ; Geiger, P. ; Gharibian, V. ; Golendukhin, A. ; Graw, G. ; Grebeniouk, O. ; Green, P.W. ; Greeniaus, L.G. ; Grosshauser, C. ; Guidal, M. ; Gute, A. ; Gyurjian, V. ; Haas, J.P. ; Haeberli, W. ; Hansen, J.O. ; Hartig, M. ; Hasch, D. ; Hausser, O. ; Heinsius, F.H. ; Henderson, R. ; Henoch, M. ; Hertenberger, R. ; Holler, Y. ; Holt, R.J. ; Hoprich, W. ; Ihssen, H. ; Iodice, M. ; Izotov, A. ; Jackson, H.E. ; Jgoun, A. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Kitching, P. ; Kobayashi, H. ; Koch, N. ; Konigsmann, Kay ; Kolstein, M. ; Kolster, H. ; Korotkov, V. ; Korsch, W. ; Kozlov, V. ; Kramer, L.H. ; Krivokhijine, V.G. ; Kurisuno, M. ; Kyle, G. ; Lachnit, W. ; Lenisa, P. ; Lorenzon, W. ; Makins, N.C.R. ; Martens, F.K. ; Martin, J.W. ; Masoli, F. ; Mateos, A. ; McAndrew, M. ; McIlhany, Kevin L. ; McKeown, R.D. ; Meissner, F. ; Menden, F. ; Metz, A. ; Meyners, N. ; Mikloukho, O. ; Miller, C.A. ; Miller, M.A. ; Milner, R. ; Most, A. ; Muccifora, V. ; Mussa, R. ; Nagaitsev, A. ; Naryshkin, Y. ; Nathan, A.M. ; Neunreither, F. ; Niczyporuk, M. ; Nowak, W.D. ; Nupieri, M. ; Oganessian, K.A. ; O'Neill, T.G. ; Openshaw, R. ; Ouyang, J. ; Owen, B.R. ; Papavassiliou, V. ; Pate, S.F. ; Pitt, M. ; Potashov, S. ; Potterveld, David H. ; Rakness, G. ; Reali, A. ; Redwine, R. ; Reolon, A.R. ; Ristinen, R. ; Rith, K. ; Rossi, P. ; Rudnitsky, S. ; Ruh, M. ; Ryckbosch, D. ; Sakemi, Y. ; Savin, Igor A. ; Scarlett, C. ; Schafer, A. ; Schmidt, F. ; Schmitt, H. ; Schnell, G. ; Schuler, K.P. ; Schwind, A. ; Seibert, J. ; Shibata, T.A. ; Shibatani, K. ; Shin, T. ; Shutov, V. ; Simani, C. ; Simon, A. ; Sinram, K. ; Slavich, P. ; Spengos, M. ; Steffens, E. ; Stenger, J. ; Stewart, J. ; Stoesslein, U. ; Sutter, M. ; Tallini, H. ; Taroian, S. ; Terkulov, A. ; Teryaev, O. ; Thomas, E. ; Tipton, B. ; Tytgat, M. ; Urciuoli, G.M. ; van den Brand, J.F.J. ; van der Steenhoven, G. ; van de Vyver, R. ; van Hunen, J.J. ; Vetterli, M.C. ; Vikhrov, V. ; Vincter, M.G. ; Visser, J. ; Volk, E. ; Wander, W. ; Wendland, J. ; Williamson, S.E. ; Wise, T. ; Woller, K. ; Yoneyama, S. ; Zohrabian, H.

Published in: Phys.Rev.Lett.
Year: 2000
Vol.: 84
Page No: 4047-4051
Pages: 5

Abstract: Single-spin asymmetries for semi-inclusive pion production in deep-inelastic scattering have been measured for the first time. A significant target-spin asymmetry of the distribution in the azimuthal angle phi of the pion relative to the lepton scattering plane was observed for pi+ electro-production on a longitudinally polarized hydrogen target. The corresponding analyzing power in the sin(phi) moment of the cross section is 0.022 +/- 0.005 +/- 0.003. This result can be interpreted as the effect of terms in the cross section involving chiral-odd spin distribution functions in combination with a time-reversal-odd fragmentation function that is sensitive to the transverse polarization of the fragmenting quark.

Web-Page: http://www.adsabs.harvard.edu/abs/2000PhRvL..84.4047A; http://alice.cern.ch/format/showfull?sysnb=0332328; http://dx.doi.org/10.1103/PhysRevLett.84.4047; http://link.aps.org/abstract/PRL/V84/P04047/

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