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Article
Report number hep-ex/0402010
Title Spin asymmetries for events with high $p_T$ hadrons in DIS and an evaluation of the gluon polarization
Related titleDEEP INELASTIC SCATTERING
deep inelastic scattering
Author(s) Adeva, B. ; Arik, E. ; Arvidson, A. ; Badelek, B. ; Baum, G. ; Berglund, P. ; Betev, L. ; Birsa, R. ; de Botton, N. ; Bradamante, F. ; Bravar, A. ; Bressan, A. ; Bultmann, S. ; Burtin, E. ; Crabb, D. ; Cranshaw, J. ; Cuhadar, T. ; Dalla Torre, S. ; van Dantzig, R. ; Derro, B. ; Deshpande, A. ; Dhawan, S. ; Dulya, C. ; Eichblatt, S. ; Fasching, D. ; Feinstein, F. ; Fernandez, C. ; Frois, B. ; Gallas, A. ; Garzon, J.A. ; Gilly, H. ; Giorgi, M. ; von Goeler, E. ; Goertz, S. ; Gracia, G. ; de Groot, N. ; Grosse Perdekamp, M. ; Haft, K. ; von Harrach, D. ; Hasegawa, T. ; Hautle, P. ; Hayashi, N. ; Heusch, C.A. ; Horikawa, N. ; Hughes, V.W. ; Igo, G. ; Ishimoto, S. ; Iwata, T. ; Kabuss, E.M. ; Karev, A. ; Kessler, H.J. ; Ketel, T.J. ; Kiryluk, J. ; Kisselev, Yu. ; Klostermann, L. ; Kowalik, K. ; Kotzinian, A. ; Kroger, W. ; Kunne, F. ; Kurek, K. ; Kyynarainen, J. ; Lamanna, M. ; Landgraf, U. ; Le Goff, J.M. ; Lehar, F. ; de Lesquen, A. ; Lichtenstadt, J. ; Litmaath, M. ; Magnon, A. ; Mallot, G.K. ; Marie, F. ; Martin, A. ; Martino, J. ; Matsuda, T. ; Mayes, B. ; McCarthy, J.S. ; Medved, K. ; Meyer, W. ; Miller, D. ; Miyachi, Y. ; Mori, K. ; Moromisato, J. ; Nassalski, J. ; Niinikoski, T.O. ; Oberski, J.E.J. ; Ogawa, A. ; Ozben, C. ; Pereira, H. ; Peshekhonov, D. ; Piegaia, R. ; Pinsky, Lawrence S. ; Platchkov, S. ; Plo, M. ; Pose, D. ; Postma, H. ; Pretz, J. ; Radel, G. ; Reicherz, G. ; Roberts, J. ; Rodriguez, M. ; Rondio, E. ; Sabo, I. ; Saborido, J. ; Sandacz, A. ; Savin, Igor A. ; Schiavon, P. ; Sichtermann, E.P. ; Simeoni, F. ; Smirnov, G.I. ; Staude, A. ; Steinmetz, A. ; Stiegler, U. ; Stuhrmann, H. ; Sulej, R. ; Tessarotto, F. ; Thers, D. ; Taczaa, W. ; Tripet, A. ; Unel, G. ; Velasco, M. ; Vogt, J. ; Voss, R. ; Whitten, C. ; Windmolders, R. ; Willumeit, R. ; Wislicki, W. ; Witzmann, A. ; Zanetti, A.M. ; Zaremba, K. ; Zhao, J.
Publication 2004
Imprint 4 Feb 2004
Number of pages 13
In: Phys. Rev. D 70 (2004) 12002-12011
DOI 10.1103/PhysRevD.70.012002
Subject category Particle Physics - Experiment
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 A_p(lN->lhhX)=0.030+/-0.057+/-0.010 and A_d(lN->lhhX)=0.070+/-0.076+/-0.010. From these values we derive an averaged gluon polarization delta(G)/G=-0.20+/-0.28+/-0.10 at an average fraction of nucleon momentum carried by gluons eta=0.07.

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