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

B. Adeva E. Arik A. Arvidson B. Badeek G. Baum P. Berglund L. Betev R. Birsa N. de Botton F. Bradamante A. Bravar A. Bressan S. Bultmann E. Burtin D. Crabb J. Cranshaw T. Cuhadar S. Dalla Torre R. van Dantzig B. Derro A. 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. Kroger F. Kunne K. Kurek J. Kyynarainen 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 1 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. Radel G. Reicherz J. Roberts M. Rodriguez E. Rondio I. Sabo J. Saborido A. Sandacz I. Savin P. Schiavon E.P. Sichtermann F. Simeoni George Smirnov A. Staude A. Steinmetz U. Stiegler H. Stuhrmann R. Sulej F. Tessarotto Dominique Thers W. Taczaa A. Tripet G. Unel M. Velasco J. Vogt R. Voss C. Whitten R. Windmolders R. Willumeit W. Wislicki A. Witzmann A.M. Zanetti K. Zaremba J. Zhao Smc Collaboration
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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Submitted on : Friday, January 14, 2005 - 7:38:31 PM
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B. Adeva, E. Arik, A. Arvidson, B. Badeek, G. Baum, et al.. Spin asymmetries for events with high p_T hadrons in DIS and an evaluation of the gluon polarization. Physical Review D, American Physical Society, 2004, 70, pp.012002. ⟨10.1103/PhysRevD.70.012002⟩. ⟨in2p3-00023593⟩

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