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Evidence for a single-spin azimuthal asymmetry in semi-inclusive pion electroproduction

Authors

Airapetian, A Akopov, N Amarian, M Aschenauer, EC Avakian, H Avakian, R Avetissian, A Avetissian, E Bains, B Baumgarten, C Beckmann, M Belostotski, S Belz, JE Benisch, T Bernreuther, S Bianchi, N Blouw, J Bottcher, H Borissov, A Bouwhuis, M Brack, J Brauksiepe, S Braun, B Bray, B Brons, S Bruckner, W Brull, A Bruins, EEW Bulten, HJ Capitani, GP Carter, P Chumney, P Cisbani, E Court, GR Dalpiaz, PF De Sanctis, E De Schepper, D Devitsin, E Huberts, PKAD Di Nezza, P Duren, M Dvoredsky, A Elbakian, G Ely, J Fantoni, A Fechtchenko, A Ferstl, M Fiedler, K Filippone, BW Fischer, H Fox, B Franz, J Frullani, S Funk, MA Garber, Y Gao, H Garibaldi, F Gavrilov, G Geiger, P Gharibyan, V Golendukhin, A Graw, G Grebeniouk, O Green, PW Greeniaus, LG Grosshauser, C Guidal, M Gute, A Gyurjyan, V Haas, JP Haeberli, W Hansen, JO Hartig, M Hasch, D Hausser, O Heinsius, FH Henderson, R Henoch, M Hertenberger, R Holler, Y Holt, RJ Hoprich, W Ihssen, H Iodice, M Izotov, A Jackson, HE Jgoun, A Kaiser, R Kinney, E Kisselev, A Kitching, P Kobayashi, H Koch, N Konigsmann, K Kolstein, M Kolster, H Korotkov, V Korsch, W Kozlov, V Kramer, LH Krivokhijine, VG Kurisuno, M Kyle, G Lachnit, W Lenisa, P Lorenzon, W Makins, NCR Martens, FK Martin, JW Masoli, F Mateos, A McAndrew, M McIlhany, K McKeown, RD Meissner, F Menden, F Metz, A Meyners, N Mikloukho, O Miller, CA Miller, MA Milner, R Most, A Muccifora, V Mussa, R Nagaitsev, A Naryshkin, Y Nathan, AM Neunreither, F Niczyporuk, M Nowak, WD Nupieri, M Oganessyan, KA O'Neill, TG Openshaw, R Ouyang, J Owen, BR Papavassiliou, V Pate, SF Pitt, M Potashov, S Potterveld, DH Rakness, G Reali, A Redwine, R Reolon, AR Ristinen, R Rith, K Rossi, P Rudnitsky, S Ruh, M Ryckbosch, D Sakemi, Y Savin, I Scarlett, C Schafer, A Schmidt, F Schmitt, H Schnell, G Schuler, KP Schwind, A Seibert, J Shibata, TA 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, GM van den Brand, JFJ van der Steenhoven, G van de Vyver, R van Hunen, JJ Vetterli, MC Vikhrov, V Vincter, MG Visser, J Volk, E Wander, W Wendland, J Williamson, SE Wise, T Woller, K Yoneyama, S Zohrabian, H

Citation

A. Airapetian et al., Evidence for a single-spin azimuthal asymmetry in semi-inclusive pion electroproduction, PHYS REV L, 84(18), 2000, pp. 4047-4051

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW LETTERS

ISSN journal

00319007 → ACNP

Volume

Issue

Year of publication

2000

Pages

4047 - 4051

Database

ISI

SICI code

0031-9007(20000501)84:18<4047:EFASAA>2.0.ZU;2-M

Abstract

Single-spin asymmetries for semi-inclusive pion production in deep-inelasti c scattering have been measured for the first time. A significant target-sp in asymmetry of the distribution in the azimuthal angle phi of the pion rel ative to the lepton scattering plane was formed for pi(+) electroproduction 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 sec tion involving chiral-odd spin distribution functions in combination with a chiral-odd fragmentation function that is sensitive to the transverse pola rization of the fragmenting quark.