Evidence for a single-spin azimuthal asymmetry in semi-inclusive pion electroproduction
- Airapetian, A.
- Akopov, N.
- Amarian, M.
- Aschenauer, E. C.
- Avakian, H.
- Avakian, R.
- Avetissian, A.
- Avetissian, E.
- Bains, B.
- Baumgarten, C.
- Beckmann, M.
- Belostotski, S.
- Belz, J. E.
- Benisch, Th.
- Bernreuther, S.
- Bianchi, N.
- Blouw, J.
- Böttcher, H.
- Borissov, A.
- Bouwhuis, M.
- Brack, J.
- Brauksiepe, S.
- Braun, B.
- Bray, B.
- Brons, St.
- Brückner, W.
- Brüll, A.
- Bruins, E. E. W.
- Bulten, H. J.
- Capitani, G. P.
- Carter, P.
- Chumney, P.
- 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.
- Düren, 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.
- Gärber, Y.
- Gao, H.
- Garibaldi, F.
- Gavrilov, G.
- Geiger, P.
- Gharibyan, V.
- Golendukhin, A.
- Graw, G.
- Grebeniouk, O.
- Green, P. W.
- Greeniaus, L. G.
- Grosshauser, C.
- Guidal, M.
- Gute, A.
- Gyurjyan, V.
- Haas, J. P.
- Haeberli, W.
- Hansen, J.-O.
- Hartig, M.
- Hasch, D.
- Häusser, 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.
- Königsmann, K.
- 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, K.
- 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.
- Oganessyan, K. A.
- O'Neill, T. G.
- Openshaw, R.
- Ouyang, J.
- Owen, B. R.
- Papavassiliou, V.
- Pate, S. F.
- Pitt, M.
- Potashov, S.
- Potterveld, D. 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, I.
- Scarlett, C.
- Schäfer, A.
- Schmidt, F.
- Schmitt, H.
- Schnell, G.
- Schüler, 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.
DOIAbstract
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 φ of the pion relative to the lepton scattering plane was formed for π+ electroproduction on a longitudinally polarized hydrogen target. The corresponding analyzing power in the sinφ 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 chiral-odd fragmentation function that is sensitive to the transverse polarization of the fragmenting quark
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