Spin asymmetries for events with high pT hadrons in DIS and an evaluation of the gluon polarization

B. Adeva*, E. Arik, A. Arvidson, B. Badelek, G. Baum, P. Berglund, L. Betev, R. Birsa, N. de 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. de 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. Le Goff, F. Lehar, A. de 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. Tlaczala, 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

*Corresponding author for this work

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130 Scopus citations

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 ApℓN→ℓhhX=0.030±0.057(stat)±0. 010(syst) and AdℓN→ℓhhX=0.070±0. 076(stat)±0.010(syst). From these values we derive an averaged gluon polarization ΔG/G=-0.20±0.28(stat)±0.10(syst) at an average fraction of nucleon momentum carried by gluons 〈η〉 = 0.07.

Original languageEnglish (US)
Article number012002
Pages (from-to)012002-1-012002-9
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume70
Issue number1
DOIs
StatePublished - Jul 2004

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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