Leading-order determination of the gluon polarization from high-p T hadron electroproduction

Airapetian, A. et al. (2010) Leading-order determination of the gluon polarization from high-p T hadron electroproduction. Journal of High Energy Physics, 2010(8), 130. (doi:10.1007/JHEP08(2010)130)

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Abstract

Longitudinal double-spin asymmetries of charged hadrons with high transverse momentum pT have been measured in electroproduction using the Hermes detector at Hera. Processes involving gluons in the nucleon have been enhanced relative to others by selecting hadrons with pT typically above 1 GeV. In this kinematic domain the gluon polarization has been extracted in leading order making use of the model embedded in the Monte Carlo Generator Pythia 6.2. The gluon polarization obtained from single inclusive hadrons in the pT range 1 GeV & pT & 2.5 GeV using a deuterium target is Δgg(⟨x⟩,⟨μ2⟩)=0.049±0.034(stat)±0.010(sys-exp)+0.126−0.099(sys-models)Δgg(⟨x⟩,⟨μ2⟩)=0.049±0.034(stat)±0.010(sys-exp)−0.099+0.126(sys-models) at a scale ⟨μ2⟩=1.35GeV2⟨μ2⟩=1.35GeV2 and ⟨x⟩=0.22⟨x⟩=0.22 . For different final states and kinematic domains, consistent values of ΔggΔgg have been found within statistical uncertainties using hydrogen and deuterium targets.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Murray, Dr Morgan and Hoek, Mr Matthias and Hill, Mr Gordon and Kaiser, Professor Ralf and Lehmann, Dr Inti and Seitz, Dr Bjoern and Rosner, Professor Guenther
Authors: Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H. P., Böttcher, H., Bonomo, C., Borissov, A., Bryzgalov, V., Capiluppi, M., Capitani, G. P., Cisbani, E., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., Demey, M., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Dreschler, J., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Guler, H., Hadjidakis, C., Hartig, M., Hasch, D., Hasegawa, T., Hill, G., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Hristova, I., Ivanilov, A., Jackson, H. E., Kaiser, R., Keri, T., Kinney, E., Kisselev, A., Kopytin, M., Korotkov, V., Kravchenko, P., Lagamba, L., Lamb, R., Lapikás, L., Lehmann, I., Lenisa, P., Liebing, P., Linden-Levy, L. A., Lorenzon, W., Lu, X.-R., Maiheu, B., Makins, N. C. R., Marianski, B., Marukyan, H., Mexner, V., Miller, C. A., Miyachi, Y., Muccifora, V., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W.-D., Pappalardo, L. L., Perez-Benito, R., Pickert, N., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rock, S. E., Rosner, G., Rostomyan, A., Rubin, J., Salomatin, Y., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shearer, C., Shibata, T.-A., Shutov, V., Stancari, M., Statera, M., Steijger, J. J. M., Stewart, J., Stinzing, F., Taroian, S., Tchuiko, B., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P. B., van der Steenhoven, G., Van Haarlem, Y., Van Hulse, C., Varanda, M., Veretennikov, D., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Ye, H., Ye, Z., Yu, W., Zeiler, D., Zihlmann, B., and Zupranski, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of High Energy Physics
Publisher:Springer
ISSN:1029-8479
ISSN (Online):1029-8479
Published Online:31 August 2010
Copyright Holders:Copyright © 2010 The Authors
First Published:First published in Journal of High Energy Physics 2010:130
Publisher Policy:Reproduced under a Creative Commons License

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