Spin asymmetries for events with high [Formula Presented] hadrons in DIS and an evaluation of the gluon polarization

B. Adeva, E. Arik, A. Arvidson, B. Badełek, G. Baum, P. Berglund, L. Betev, R. Birsa, N. Botton, F. Bradamante, A. Bravar, A. Bressan, S. Bültmann, E. Burtin, D. Crabb, J. Cranshaw, T. Çuhadar, S. Dalla Torre, R. van Dantzig, B. DerroA. Deshpande, S. Dhawan, C. Dulya, S. Eichblatt, D. Fasching, F. Feinstein, C. Fernandez, B. Frois, A. Gallas, J. A. Garzon, H. Gilly, M. Giorgi, E. von Goeler, S. Goertz, G. Gracia, N. Groot, M. Grosse Perdekamp, K. Haft, D. von Harrach, T. Hasegawa, P. Hautle, N. Hayashi, C. A. Heusch, N. Horikawa, V. W. Hughes, G. Igo, S. Ishimoto, T. Iwata, E. M. Kabuß, A. Karev, H. J. Kessler, T. J. Ketel, J. Kiryluk, Yu Kisselev, L. Klostermann, K. Kowalik, A. Kotzinian, W. Kröger, F. Kunne, K. Kurek, J. Kyynäräinen, M. Lamanna, U. Landgraf, J. M. Goff, F. Lehar, A. Lesquen, J. Lichtenstadt, M. Litmaath, A. Magnon, G. K. Mallot, F. Marie, A. Martin, J. Martino, T. Matsuda, B. Mayes, J. S. McCarthy, K. Medved, W. Meyer, D. Miller, Y. Miyachi, K. Mori, J. Moromisato, J. Nassalski, T. O. Niinikoski, J. E.J. Oberski, A. Ogawa, C. Ozben, H. Pereira, D. Peshekhonov, R. Piegaia, L. Pinsky, S. Platchkov, M. Plo, D. Pose, H. Postma, J. Pretz, G. Rädel, G. Reicherz, J. Roberts, M. Rodriguez, E. Rondio, I. Sabo, J. Saborido, A. Sandacz, I. Savin, P. Schiavon, E. P. Sichtermann, F. Simeoni, G. I. Smirnov, A. Staude, A. Steinmetz, U. Stiegler, H. Stuhrmann, R. Sulej, F. Tessarotto, D. Thers, W. Tłaczała, A. Tripet, G. Unel, M. Velasco, J. Vogt, R. Voss, C. Whitten, R. Windmolders, R. Willumeit, W. Wiślicki, A. Witzmann, A. M. Zanetti, K. Zaremba, J. Zhao

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in the final state. Two methods of event classification are used to increase the contribution of the photon-gluon fusion process to above 30%. The most effective one, based on a neural network approach, provides the asymmetries [Formula Presented] and [Formula Presented] From these values we derive an averaged gluon polarization [Formula Presented] at an average fraction of nucleon momentum carried by gluons [Formula Presented].

Original languageEnglish
Pages (from-to)9
Number of pages1
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume70
Issue number1
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

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