/ Experiment-HEP arXiv:0904.3209


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


Alekseev, M. (INFN, Turin) ; Alexakhin, V.Yu. (Dubna, JINR) ; Alexandrov, Yu. (Lebedev Inst.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (INFN, Turin) ; Austregisilio, A. (Munich, Tech. U.) ; Badelek, B. (Warsaw, Inst. Nucl. Studies) ; Balestra, F. (INFN, Turin) ; Ball, J. (SPhN, DAPNIA, Saclay) ; Barth, J. (Bonn U.) ; Baum, G. (Bielefeld U.) ; Bedfer, Y. (SPhN, DAPNIA, Saclay) ; Bernhard, J. (Mainz U., Inst. Kernphys.) ; Bertini, R. (INFN, Turin) ; Bettinelli, M. (Munich U.) ; Birsa, R. (INFN, Trieste) ; Bisplinghoff, J. (Bonn U., HISKP) ; Bordalo, P. (Lisbon, LIFEP) ; Bradamante, F. (INFN, Trieste) ; Bravar, A. (INFN, Trieste) ; Bressan, A. (INFN, Trieste) ; Brona, G. (Warsaw, Inst. Nucl. Studies) ; Burtin, E. (SPhN, DAPNIA, Saclay) ; Bussa, M.P. (INFN, Turin) ; Chapiro, A. (INFN, Turin) ; Chiosso, M. (INFN, Turin) ; Chung, S.U. (Munich, Tech. U.) ; Cicuttin, A. (INFN, Turin) ; Colantoni, M. (INFN, Turin) ; Crespo, M.L. (INFN, Turin) ; Dalla Torre, S. (INFN, Trieste) ; Dafni, T. (SPhN, DAPNIA, Saclay) ; Das, S. (Matrivani Inst., Calcutta) ; Dasgupta, S.S. (Burdwan U.) ; Denisov, O.Yu. (INFN, Turin) ; Dhara, L. (Matrivani Inst., Calcutta) ; Diaz, V. (INFN, Turin) ; Dinkelbach, A.M. (Munich, Tech. U.) ; Donskov, S.V. (Serpukhov, IHEP) ; Doshita, N. (Yamagata U.) ; Duic, V. (INFN, Trieste) ; Dunnweber, W. (Munich U.) ; Efremov, A. (Dubna, JINR) ; El Alaoui, A. (SPhN, DAPNIA, Saclay) ; Eversheim, P.D. (Bonn U., HISKP) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Faessler, M. (Munich U.) ; Ferrero, A. (CERN) ; Finger, M. (Charles U.) ; Finger, M., jr. (Dubna, JINR) ; Fischer, H. (Freiburg U.) ; Franco, C. (Lisbon, LIFEP) ; Friedrich, J.M. (Munich, Tech. U.) ; Garfagnini, R. (INFN, Turin) ; Gautheron, F. (Bielefeld U.) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gazda, R. (Warsaw, Inst. Nucl. Studies) ; Gerassimov, S. (Munich, Tech. U.) ; Geyer, R. (Munich U.) ; Giorgi, M. (INFN, Trieste) ; Gobbo, B. (INFN, Trieste) ; Goertz, S. (Bonn U.) ; Grabmuller, S. (Munich, Tech. U.) ; Grajek, O.A. (Warsaw, Inst. Nucl. Studies) ; Grasso, A. (INFN, Turin) ; Grube, B. (Munich, Tech. U.) ; Gushterski, R. (Dubna, JINR) ; Guskov, A. (Dubna, JINR) ; Haas, F. (Munich, Tech. U.) ; Hagemann, R. (Freiburg U.) ; von Harrach, D. (Mainz U., Inst. Kernphys.) ; Hasegawa, T. (Miyazaki U.) ; Heckmann, J. (Ruhr U., Bochum) ; Heinsius, F.H. (Freiburg U.) ; Hermann, R. (Mainz U., Inst. Kernphys.) ; Herrmann, F. (Freiburg U.) ; Hess, C. (Ruhr U., Bochum) ; Hinterberger, F. (Bonn U., HISKP) ; von Hodenberg, M. (Freiburg U.) ; Horikawa, N. (Nagoya U.) ; Hoppner, Ch. (Munich, Tech. U.) ; d'Hose, N. (SPhN, DAPNIA, Saclay) ; Ilgner, C. (Munich U.) ; Ishimoto, S. (Nagoya U.) ; Ivanov, O. (Dubna, JINR) ; Ivanshin, Yu. (Dubna, JINR) ; Iwata, T. (Yamagata U.) ; Jahn, R. (Bonn U., HISKP) ; Jasinski, P. (Mainz U., Inst. Kernphys.) ; Jegou, G. (SPhN, DAPNIA, Saclay) ; Joosten, R. (Bonn U., HISKP) ; Kabuss, E. (Mainz U., Inst. Kernphys.) ; Kafer, W. (Freiburg U.) ; Kang, D. (Freiburg U.) ; Ketzer, B. (Munich, Tech. U.) ; Khaustov, G.V. (Serpukhov, IHEP) ; Khokhlov, Yu.A. (Serpukhov, IHEP) ; Kiefer, J. (Freiburg U.) ; Kisselev, Yu. (Ruhr U., Bochum) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (Warsaw, Inst. Nucl. Studies) ; Koblitz, S. (Mainz U., Inst. Kernphys.) ; Koivuniemi, J.H. (Ruhr U., Bochum) ; Kolosov, V.N. (Serpukhov, IHEP) ; Komissarov, E.V. (Dubna, JINR) ; Kondo, K. (Yamagata U.) ; Konigsmann, Kay (Freiburg U.) ; Konorov, I. (Munich, Tech. U.) ; Konstantinov, V.F. (Serpukhov, IHEP) ; Korzenev, A. (Mainz U., Inst. Kernphys.) ; Kotzinian, A.M. (SPhN, DAPNIA, Saclay) ; Kouznetsov, O. (SPhN, DAPNIA, Saclay) ; Kowalik, K. (SPhN, DAPNIA, Saclay) ; Kramer, M. (Munich, Tech. U.) ; Kral, A. (Prague, Tech. U.) ; Kroumchtein, Z.V. (Dubna, JINR) ; Kuhn, R. (Munich, Tech. U.) ; Kunne, F. (SPhN, DAPNIA, Saclay) ; Kurek, K. (Warsaw, Inst. Nucl. Studies) ; Le Goff, J.M. (SPhN, DAPNIA, Saclay) ; Lednev, A.A. (Serpukhov, IHEP) ; Lehmann, A. (Erlangen - Nuremberg U.) ; Levorato, S. (INFN, Trieste) ; Lichtenstadt, J. (Tel Aviv U.) ; Liska, T. (Prague, Tech. U.) ; Maggiora, A. (INFN, Turin) ; Maggiora, M. (INFN, Turin) ; Magnon, A. (SPhN, DAPNIA, Saclay) ; Mallot, G.K. (CERN) ; Mann, A. (Munich, Tech. U.) ; Marchand, C. (SPhN, DAPNIA, Saclay) ; Marroncle, J. (SPhN, DAPNIA, Saclay) ; Martin, A. (INFN, Trieste) ; Marzec, J. (Warsaw U. of Tech.) ; Massmann, F. (Bonn U., HISKP) ; Matsuda, T. (Miyazaki U.) ; Maximov, A.N. (Dubna, JINR) ; Meyer, W. (Ruhr U., Bochum) ; Michigami, T. (Yamagata U.) ; Mikhailov, Yu.V. (Serpukhov, IHEP) ; Moinester, M.A. (Tel Aviv U.) ; Mutter, A. (Mainz U., Inst. Kernphys.) ; Nagaytsev, A. (Dubna, JINR) ; Nagel, T. (Munich, Tech. U.) ; Nassalski, J. (Warsaw, Inst. Nucl. Studies) ; Negrini, S. (Bonn U., HISKP) ; Nerling, F. (Freiburg U.) ; Neubert, S. (Munich, Tech. U.) ; Neyret, D. (SPhN, DAPNIA, Saclay) ; Nikolaenko, V.I. (Serpukhov, IHEP) ; Olshevsky, A.G. (Dubna, JINR) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Padee, A. (Warsaw U. of Tech.) ; Panknin, R. (Bonn U.) ; Panebianco, S. (SPhN, DAPNIA, Saclay) ; Panzieri, D. (INFN, Turin) ; Parsamyan, B. (INFN, Turin) ; Paul, S. (Munich, Tech. U.) ; Pawlukiewicz-Kaminska, B. (Warsaw, Inst. Nucl. Studies) ; Perevalova, E. (Dubna, JINR) ; Pesaro, G. (INFN, Trieste) ; Peshekhonov, D.V. (Dubna, JINR) ; Piragino, G. (INFN, Turin) ; Platchkov, S. (SPhN, DAPNIA, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polak, J. (INFN, Trieste) ; Polyakov, V.A. (Serpukhov, IHEP) ; Pontecorvo, G. (Dubna, JINR) ; Pretz, J. (Bonn U.) ; Quintans, C. (Lisbon, LIFEP) ; Rajotte, J.-F. (Munich U.) ; Ramos, S. (Lisbon, LIFEP) ; Rapatsky, V. (Dubna, JINR) ; Reicherz, G. (Ruhr U., Bochum) ; Reggiani, D. (CERN) ; Richter, A. (Erlangen - Nuremberg U.) ; Robinet, F. (SPhN, DAPNIA, Saclay) ; Rocco, E. (INFN, Turin) ; Rondio, E. (Warsaw, Inst. Nucl. Studies) ; Ryabchikov, D.I. (Serpukhov, IHEP) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Sandacz, A. (Warsaw, Inst. Nucl. Studies) ; Santos, H. (Lisbon, LIFEP) ; Sapozhnikov, M.G. (Dubna, JINR) ; Sarkar, S. (Matrivani Inst., Calcutta) ; Savin, Igor A. (Dubna, JINR) ; Sbrizza, G. (INFN, Trieste) ; Schiavon, P. (INFN, Trieste) ; Schill, C. (Freiburg U.) ; Schmitt, L. (Munich, Tech. U.) ; Schroder, W. (Erlangen - Nuremberg U.) ; Shevchenko, O.Yu. (Dubna, JINR) ; Siebert, H.-W. (Mainz U., Inst. Kernphys.) ; Silva, L. (Lisbon, LIFEP) ; Sinha, L. (Matrivani Inst., Calcutta) ; Sissakian, A.N. (Dubna, JINR) ; Slunecka, M. (Dubna, JINR) ; Smirnov, G.I. (Dubna, JINR) ; Sosio, S. (INFN, Turin) ; Sozzi, F. (INFN, Trieste) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Stolarski, M. (CERN) ; Sulc, M. (Liberec Tech. U.) ; Sulej, R. (Warsaw U. of Tech.) ; Takekawa, S. (INFN, Trieste) ; Tessaro, S. (INFN, Trieste) ; Tessarotto, F. (INFN, Trieste) ; Teufel, A. (Erlangen - Nuremberg U.) ; Tkatchev, L.G. (Dubna, JINR) ; Venugopal, G. (Bonn U., HISKP) ; Virius, M. (Prague, Tech. U.) ; Vlassov, N.V. (Dubna, JINR) ; Vossen, A. (Freiburg U.) ; Weitzel, Q. (Munich, Tech. U.) ; Wenzl, K. (Freiburg U.) ; Windmolders, R. (Bonn U.) ; Wislicki, W. (Warsaw, Inst. Nucl. Studies) ; Wollny, H. (Freiburg U.) ; Zaremba, K. (Warsaw U. of Tech.) ; Zavertyaev, M. (Lebedev Inst.) ; Zemlyanichkina, E. (Dubna, JINR) ; Ziembicki, M. (Warsaw U. of Tech.) ; Zhao, J. (INFN, Trieste) ; Zhuravlev, N. (Dubna, JINR) ; Zvyagin, A. (Munich U.)

Published in: Phys.Lett.
Year: 2009
Vol.: B676
Page No: 31-38
Pages: 16

Abstract: The gluon polarisation in the nucleon has been determined by detecting charm production via D0 meson decay to charged K and pi 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 corresponds to an integrated luminosity of 2.8 fb^-1. The dominant underlying process of charm production is the photon-gluon fusion to a cc-bar pair. A leading order QCD approach gives an average gluon polarisation of (Delta g/g)_x= -0.49 +- 0.27(stat) +- 0.11(syst) at a scale mu^2 ~ 13 (GeV/c)^2 and at an average gluon momentum fraction (x) ~ 0.11. The longitudinal cross-section asymmetry for D0 production is presented in bins of the transverse momentum and the energy of the D0 meson.

Keyword(s): inelastic muon scattering ; Spin ; Asymmetry ; Gluon polarisation

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