Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering
2001; American Physical Society; Volume: 64; Issue: 9 Linguagem: Inglês
10.1103/physrevd.64.097101
ISSN1538-4500
AutoresA. Airapetian, Н. Акопов, Z. Akopov, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, B. Bains, V. Baturin, C. Baumgarten, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H. Böttcher, A. Borissov, O. Bouhali, M. Bouwhuis, J. Brack, S. Brauksiepe, W. Brückner, A. Brüll, I. Brunn, H. J. Bulten, G. P. Capitani, P. Chumney, E. Cisbani, G. Ciullo, G.R. Court, P.F. Dalpiaz, R. De Leo, L. De Nardo, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, V. Djordjadze, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, J. Ely, A. Fantoni, A. Fechtchenko, L. Felawka, B. W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, Y. Gärber, F. Garibaldi, E. Garutti, G. Gavrilov, V. Gharibyan, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, A. Gute, W. Haeberli, K. Hafidi, M. Hartig, D. Hasch, D. Heesbeen, F. H. Heinsius, M. Henoch, R. Hertenberger, W.H.A. Hesselink, G. Hofman, Y. Holler, R. J. Holt, B. Hommez, G. Iarygin, A. Izotov, H. E. Jackson, A. Jgoun, Peter Jung, R. Kaiser, J. Kanesaka, E. Kinney, A. Kisselev, P. Kitching, Hisao Kobayashi, N. Koch, K. Königsmann, H. Kolster, В. А. Коротков, E. Kotik, В. Козлов, Bernhard Krauß, V. G. Krivokhijine, G. S. Kyle, L. Lagamba, A. Laziev, P. Lenisa, P. Liebing, T. Lindemann, W. Lorenzon, Axel Maas, N. C. R. Makins, H. Marukyan, F. Masoli, M. McAndrew, K. McIlhany, F. Meißner, F. Menden, N. Meyners, O. Mikloukho, C. A. Miller, R. Milner, V. Muccifora, R. Mussa, А. Нагайцев, E. Nappi, Y. Naryshkin, A. Nass, K. Negodaeva, W.‐D. Nowak, K. Oganessyan, T. G. O’Neill, B. Owen, S. F. Pate, S. Potashov, D. H. Potterveld, M. Raithel, G. Rakness, V. Rappoport, R. Redwine, D. Reggiani, A. R. Reolon, K. Rith, D. Robinson, A. Rostomyan, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Sanjiev, Fuminobu Sato, I. Savin, C. Scarlett, A. Schäfer, C. Schill, Friedrich Schmidt, G. Schnell, K. P. Schüler, A. Schwind, J. Anthony Seibert, B. Seitz, T.-A. Shibata, V. Shutov, M. C. Simani, A. Simon, K. Sinram, E. Steffens, J. J. M. Steijger, J. Stewart, U. Stößlein, K. Suetsugu, S. Taroian, A. Terkulov, Oleg Teryaev, S. Tessarin, E. Thomas, B. Tipton, M. Tytgat, G. M. Urciuoli, J. van den Brand, G. van der Steenhoven, J. van den Brand, J. van den Brand, M. C. Vetterli, V. Vikhrov, M. G. Vincter, J. Visser, C. Weiskopf, J. Wendland, Jürgen Wilbert, T. Wise, S. Yen, S. Yoneyama, and H. Zohrabian,
Tópico(s)High-Energy Particle Collisions Research
ResumoA 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 sinφ moment of the cross section is 0.019±0.007(stat)±0.003(syst). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The π0 asymmetry is of the same size as the π+ 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 struck quark.Received 4 April 2001DOI:https://doi.org/10.1103/PhysRevD.64.097101©2001 American Physical Society
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