Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering
- Airapetian, A.
- Akopov, N.
- Akopov, Z.
- Amarian, M.
- Aschenauer, E.C.
- Avakian, H.
- Avakian, R.
- Avetissian, A.
- Avetissian, E.
- Bailey, P.
- Bains, B.
- Baturin, V.
- Baumgarten, C.
- Beckmann, M.
- Belostotski, S.
- Bernreuther, S.
- Bianchi, N.
- Böttcher, H.
- Borissov, A.
- Bouhali, O.
- Bouwhuis, M.
- Brack, J.
- Brauksiepe, S.
- Brückner, W.
- Brüll, A.
- Brunn, I.
- Bulten, H.J.
- Capitani, G.P.
- Chumney, P.
- Cisbani, E.
- Ciullo, G.
- Court, G.R.
- Dalpiaz, P.F.
- De Leo, R.
- De Nardo, L.
- De Sanctis, E.
- De Schepper, D.
- Devitsin, E.
- de Witt Huberts, P.K.A.
- Di Nezza, P.
- Djordjadze, V.
- Düren, M.
- Ehrenfried, M.
- Elbakian, G.
- Ellinghaus, F.
- Ely, J.
- Fantoni, A.
- Fechtchenko, A.
- Felawka, L.
- Filippone, B.W.
- Fischer, H.
- Fox, B.
- Franz, J.
- Frullani, S.
- Gärber, Y.
- Garibaldi, F.
- Garutti, E.
- Gavrilov, G.
- Gharibyan, V.
- Golendukhin, A.
- Graw, G.
- Grebeniouk, O.
- Green, P.W.
- Greeniaus, L.G.
- Gute, A.
- Haeberli, W.
- Hafidi, K.
- Hartig, M.
- Hasch, D.
- Heesbeen, D.
- Heinsius, F.H.
- Henoch, M.
- Hertenberger, R.
- Hesselink, W.H.A.
- Hofman, G.
- Holler, Y.
- Holt, R.J.
- Hommez, B.
- Iarygin, G.
- Izotov, A.
- Jackson, H.E.
- Jgoun, A.
- Jung, P.
- Kaiser, R.
- Kanesaka, J.
- Kinney, E.
- Kisselev, A.
- Kitching, P.
- Kobayashi, H.
- Koch, N.
- Königsmann, K.
- Kolster, H.
- Korotkov, V.
- Kotik, E.
- Kozlov, V.
- Krauss, B.
- Krivokhijine, V.G.
- Kyle, G.
- Lagamba, L.
- Laziev, A.
- Lenisa, P.
- Liebing, P.
- Lindemann, T.
- Lorenzon, W.
- Maas, A.
- Makins, N.C.R.
- Marukyan, H.
- Masoli, F.
- McAndrew, M.
- McIlhany, K.
- Meissner, F.
- Menden, F.
- Meyners, N.
- Mikloukho, O.
- Miller, C. A.
- Milner, R.
- Muccifora, V.
- Mussa, R.
- Nagaitsev, A.
- Nappi, E.
- Naryshkin, Y.
- Nass, A.
- Negodaeva, K.
- Nowak, W.-D.
- Oganessyan, K.
- O’Neill, T.G.
- Owen, B.R.
- Pate, S.F.
- Potashov, S.
- Potterveld, D.H.
- Raithel, M.
- Rakness, G.
- Rappoport, V.
- Redwine, R.
- Reggiani, D.
- Reolon, A.R.
- Rith, K.
- Robinson, D.
- Rostomyan, A.
- Ruh, M.
- Ryckbosch, D.
- Sakemi, Y.
- Sanjiev, I.
- Sato, F.
- Savin, I.
- Scarlett, C.
- Schäfer, A.
- Schill, C.
- Schmidt, F.
- Schnell, G.
- Schüler, K.P.
- Schwind, A.
- Seibert, J.
- Seitz, B.
- Shibata, T.-A.
- Shutov, V.
- Simani, M.C.
- Simon, A.
- Sinram, K.
- Steffens, E.
- Steijger, J.J.M.
- Stewart, J.
- Stösslein, U.
- Suetsugu, K.
- Taroian, S.
- Terkulov, A.
- Teryaev, O.
- Tessarin, S.
- 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.
- Weiskopf, C.
- Wendland, J.
- Wilbert, J.
- Wise, T.
- Yen, S.
- Yoneyama, S.
- Zohrabian, H.
DOIAbstract
A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analyzing power in the sin phi moment of the cross section is 0.019+or-0.007(stat)+or-0.003(syst). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi /sup 0/ asymmetry is of the same size as the pi /sup +/ asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the ...
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