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

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 3...

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Detalles Bibliográficos
Autores principales: 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.
Lenguaje:eng
Publicado: 2004
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.70.012002
http://cds.cern.ch/record/709685
Descripción
Sumario: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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