Gluon polarisation in the nucleon and longitudinal double spin asymmetries from open charm muoproduction

Published

Journal Article

The gluon polarisation in the nucleon has been determined by detecting charm production via D 0 meson decay to charged K and π in polarised muon scattering off a longitudinally polarised deuteron target. The data were taken by the COMPASS Collaboration at CERN between 2002 and 2006 and correspond to an integrated luminosity of 2.8 fb -1. The dominant underlying process of charm production is the photon-gluon fusion to a c over(c, ̄) pair. A leading order QCD approach gives an average gluon polarisation of 〈 Δ g / g 〉 x = - 0.49 ± 0.27 (stat) ± 0.11 (syst) at a scale μ 2 ≈ 13   (GeV / c) 2 and at an average gluon momentum fraction 〈 x 〉 ≈ 0.11. The longitudinal cross-section asymmetry for D 0 production is presented in bins of the transverse momentum and the energy of the D 0 meson. © 2009 Elsevier B.V. All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Alekseev, M; Alexakhin, VY; Alexandrov, Y; Alexeev, GD; Amoroso, A; Austregisilio, A; Badełek, B; Balestra, F; Ball, J; Barth, J; Baum, G; Bedfer, Y; Bernhard, J; Bertini, R; Bettinelli, M; Birsa, R; Bisplinghoff, J; Bordalo, P; Bradamante, F; Bravar, A; Bressan, A; Brona, G; Burtin, E; Bussa, MP; Chapiro, A; Chiosso, M; Chung, SU; Cicuttin, A; Colantoni, M; Crespo, ML; Torre, SD; Dafni, T; Das, S; Dasgupta, SS; Denisov, OY; Dhara, L; Diaz, V; Dinkelbach, AM; Donskov, SV; Doshita, N; Duic, V; Dünnweber, W; Efremov, A; El Alaoui, A; Eversheim, PD; Eyrich, W; Faessler, M; Ferrero, A; Finger, M; Fischer, H; Franco, C; Friedrich, JM; Garfagnini, R; Gautheron, F; Gavrichtchouk, OP; Gazda, R; Gerassimov, S; Geyer, R; Giorgi, M; Gobbo, B; Goertz, S; Grabmüller, S; Grajek, OA; Grasso, A; Grube, B; Gushterski, R; Guskov, A; Haas, F; Hagemann, R; von Harrach, D; Hasegawa, T; Heckmann, J; Heinsius, FH; Hermann, R; Herrmann, F; Heß, C; Hinterberger, F; von Hodenberg, M; Horikawa, N; Höppner, C; d'Hose, N; Ilgner, C; Ishimoto, S; Ivanov, O; Ivanshin, Y; Iwata, T; Jahn, R; Jasinski, P; Jegou, G; Joosten, R; Kabuß, E; Käfer, W; Kang, D; Ketzer, B; Khaustov, GV; Khokhlov, YA; Kiefer, J; Kisselev, Y; Klein, F

Published Date

  • June 1, 2009

Published In

Volume / Issue

  • 676 / 1-3

Start / End Page

  • 31 - 38

International Standard Serial Number (ISSN)

  • 0370-2693

Digital Object Identifier (DOI)

  • 10.1016/j.physletb.2009.04.059

Citation Source

  • Scopus