Home > CERN Experiments > SPS Experiments > COMPASS > COMPASS Conference Proceedings > Leading and Next-to-Leading Order Gluon Polarization in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction |
Article | |
Report number | arXiv:1211.6849 ; CERN-PH-EP-2012-350 ; CERN-PH-EP-2012-350 |
Title | Leading and Next-to-Leading Order Gluon Polarization in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction |
Author(s) |
Adolph, C. (Erlangen - Nuremberg U.) ; Alekseev, M.G. (INFN, Trieste) ; Alexakhin, V.Yu. (Dubna, JINR) ; Alexandrov, Yu. (Lebedev Inst.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (INFN, Turin) ; Antonov, A.A. (Dubna, JINR) ; Austregesilo, A. (CERN ; Munich, Tech. U.) ; Badelek, B. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Balestra, F. (INFN, Turin) ; Barth, J. (Bonn U.) ; Baum, G. (Bielefeld U.) ; Bedfer, Y. (IRFU, SPhN, Saclay) ; Berlin, A. (Ruhr U., Bochum) ; Bernhard, J. (Mainz U., Inst. Kernphys.) ; Bertini, R. (INFN, Turin) ; Bettinelli, M. (Munich U.) ; Bicker, K. (CERN ; Munich, Tech. U.) ; Bieling, J. (Bonn U.) ; Birsa, R. (INFN, Trieste) ; Bisplinghoff, J. (Bonn U., HISKP) ; Bordalo, P. (LIP, Lisbon ; Lisbon, Tech. U.) ; Bradamante, F. (INFN, Trieste) ; Braun, C. (Erlangen - Nuremberg U.) ; Bravar, A. (INFN, Trieste) ; Bressan, A. (INFN, Trieste) ; Buchele, M. (Freiburg U.) ; Burtin, E. (IRFU, SPhN, Saclay) ; Capozza, L. (IRFU, SPhN, Saclay) ; Chiosso, M. (INFN, Turin) ; Chung, S.U. (Munich, Tech. U.) ; Cicuttin, A. (INFN, Trieste) ; Crespo, M.L. (INFN, Trieste) ; Dalla Torre, S. (INFN, Trieste) ; Das, S. (Matrivani Inst., Calcutta) ; Dasgupta, S.S. (Matrivani Inst., Calcutta) ; Dasgupta, S. (Matrivani Inst., Calcutta) ; Denisov, O.Yu. (INFN, Turin) ; Dhara, L. (Matrivani Inst., Calcutta) ; Donskov, S.V. (Serpukhov, IHEP) ; Doshita, N. (Yamagata U.) ; Duic, V. (INFN, Trieste) ; Dunnweber, W. (Munich U.) ; Dziewiecki, M. (Warsaw U. of Tech.) ; Efremov, A. (Dubna, JINR) ; Elia, C. (INFN, Trieste) ; Eversheim, P.D. (Bonn U., HISKP) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Faessler, M. (Munich U.) ; Ferrero, A. (IRFU, SPhN, Saclay) ; Filin, A. (Serpukhov, IHEP) ; Finger, M. (Charles U.) ; Finger, M., Jr. (Dubna, JINR) ; Fischer, H. (Freiburg U.) ; Franco, C. (LIP, Lisbon) ; du Fresne von Hohenesche, N. (Mainz U., Inst. Kernphys. ; CERN) ; Friedrich, J.M. (Munich, Tech. U.) ; Frolov, V. (CERN) ; Garfagnini, R. (INFN, Turin) ; Gautheron, F. (Ruhr U., Bochum) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gerassimov, S. (Lebedev Inst. ; Munich, Tech. U.) ; Geyer, R. (Munich U.) ; Giorgi, M. (INFN, Trieste) ; Gnesi, I. (INFN, Turin) ; Gobbo, B. (INFN, Trieste) ; Goertz, S. (Bonn U.) ; Grabmuller, S. (Munich, Tech. U.) ; Grasso, A. (INFN, Turin) ; Grube, B. (Munich, Tech. U.) ; Gushterski, R. (Dubna, JINR) ; Guskov, A. (Dubna, JINR) ; Guthorl, T. (Freiburg U.) ; Haas, F. (Munich, Tech. U.) ; von Harrach, D. (Mainz U., Inst. Kernphys.) ; Heinsius, F.H. (Freiburg U.) ; Herrmann, F. (Freiburg U.) ; Hess, C. (Ruhr U., Bochum) ; Hinterberger, F. (Bonn U., HISKP) ; Horikawa, N. (Nagoya U. ; Chubu U.) ; Hoppner, Ch. (Munich, Tech. U.) ; d'Hose, N. (IRFU, SPhN, Saclay) ; Huber, S. (Munich, Tech. U.) ; Ishimoto, S. (Yamagata U. ; KEK, Tsukuba) ; Ivanov, O. (Dubna, JINR) ; Ivanshin, Yu. (Dubna, JINR) ; Iwata, T. (Yamagata U.) ; Jahn, R. (Bonn U., HISKP) ; Jary, V. (Prague, Tech. U.) ; Jasinski, P. (Mainz U., Inst. Kernphys.) ; Joosten, R. (Bonn U., HISKP) ; Kabuss, E. (Mainz U., Inst. Kernphys.) ; Kang, D. (Mainz U., Inst. Kernphys.) ; Ketzer, B. (Munich, Tech. U.) ; Khaustov, G.V. (Serpukhov, IHEP) ; Khokhlov, Yu.A. (Serpukhov, IHEP) ; Kisselev, Yu. (Ruhr U., Bochum) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Koblitz, S. (Mainz U., Inst. Kernphys.) ; Koivuniemi, J.H. (Ruhr U., Bochum) ; Kolosov, V.N. (Serpukhov, IHEP) ; Kondo, K. (Yamagata U.) ; Konigsmann, K. (Freiburg U.) ; Konorov, I. (Lebedev Inst. ; Munich, Tech. U.) ; Konstantinov, V.F. (Serpukhov, IHEP) ; Korzenev, A. (IRFU, SPhN, Saclay ; Dubna, JINR) ; Kotzinian, A.M. (INFN, Turin) ; Kouznetsov, O. (Dubna, JINR ; IRFU, SPhN, Saclay) ; Kramer, M. (Munich, Tech. U.) ; Kroumchtein, Z.V. (Dubna, JINR) ; Kunne, F. (IRFU, SPhN, Saclay) ; Kurek, K. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Lauser, L. (Freiburg U.) ; 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) ; Magnon, A. (IRFU, SPhN, Saclay) ; Makke, N. (IRFU, SPhN, Saclay ; INFN, Trieste) ; Mallot, G.K. (CERN) ; Mann, A. (Munich, Tech. U.) ; Marchand, C. (IRFU, SPhN, Saclay) ; Martin, A. (INFN, Trieste) ; Marzec, J. (Warsaw U. of Tech.) ; Matsuda, T. (Miyazaki U.) ; Meshcheryakov, G. (Dubna, JINR) ; Meyer, W. (Ruhr U., Bochum) ; Michigami, T. (Yamagata U.) ; Mikhailov, Yu.V. (Serpukhov, IHEP) ; Morreale, A. (IRFU, SPhN, Saclay ; NSF, Wash., D.C.) ; Mutter, A. (Freiburg U. ; Mainz U., Inst. Kernphys.) ; Nagaytsev, A. (Dubna, JINR) ; Nagel, T. (Munich, Tech. U.) ; Nerling, F. (Freiburg U.) ; Neubert, S. (Munich, Tech. U.) ; Neyret, D. (IRFU, SPhN, Saclay) ; Nikolaenko, V.I. (Serpukhov, IHEP) ; Nowak, W.D. (Freiburg U.) ; Nunes, A.S. (LIP, Lisbon) ; Olshevsky, A.G. (Dubna, JINR) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Padee, A. (Warsaw U. of Tech.) ; Panknin, R. (Bonn U.) ; Panzieri, D. (INFN, Turin) ; Parsamyan, B. (INFN, Turin) ; Paul, S. (Munich, Tech. U.) ; Perevalova, E. (Dubna, JINR) ; Pesaro, G. (INFN, Trieste) ; Peshekhonov, D.V. (Dubna, JINR) ; Piragino, G. (INFN, Turin) ; Platchkov, S. (IRFU, SPhN, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polak, J. (Liberec Tech. U. ; INFN, Trieste) ; Polyakov, V.A. (Serpukhov, IHEP) ; Pretz, J. (Bonn U. ; Aachen, Tech. Hochsch.) ; Quaresma, M. (LIP, Lisbon) ; Quintans, C. (LIP, Lisbon) ; Rajotte, J.F. (Munich U.) ; Ramos, S. (LIP, Lisbon ; Lisbon, Tech. U.) ; Rapatsky, V. (Dubna, JINR) ; Reicherz, G. (Ruhr U., Bochum) ; Rocco, E. (CERN) ; Rondio, E. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Rossiyskaya, N.S. (Dubna, JINR) ; Ryabchikov, D.I. (Serpukhov, IHEP) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Sandacz, A. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Sapozhnikov, M.G. (Dubna, JINR) ; Sarkar, S. (Matrivani Inst., Calcutta) ; Savin, I.A. (Dubna, JINR) ; Sbrizzai, G. (INFN, Trieste) ; Schiavon, P. (INFN, Trieste) ; Schill, C. (Freiburg U.) ; Schluter, T. (Munich U.) ; Schmidt, A. (Erlangen - Nuremberg U.) ; Schmidt, K. (Freiburg U.) ; Schmitt, L. (Munich, Tech. U. ; Darmstadt, GSI) ; Schmiden, H. (Bonn U., HISKP) ; Schonning, K. (CERN) ; Schopferer, S. (Freiburg U.) ; Schott, M. (CERN) ; Shevchenko, O.Yu. (Dubna, JINR) ; Silva, L. (LIP, Lisbon) ; 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) ; Steiger, L. (INFN, Trieste) ; Stolarski, M. (LIP, Lisbon) ; Sulc, M. (Liberec Tech. U.) ; Sulej, R. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Suzuki, H. (Yamagata U. ; Chubu U.) ; Sznajder, P. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Takekawa, S. (INFN, Turin) ; Ter Wolbeek, J. (Freiburg U.) ; Tessaro, S. (INFN, Trieste) ; Tessarotto, F. (INFN, Trieste) ; Tkatchev, L.G. (Dubna, JINR) ; Uhl, S. (Munich, Tech. U.) ; Uman, I. (Munich U.) ; Vandenbroucke, M. (IRFU, SPhN, Saclay) ; Virius, M. (Prague, Tech. U.) ; Vlassov, N.V. (Dubna, JINR) ; Wang, L. (Ruhr U., Bochum) ; Weisrock, T. (Mainz U., Inst. Kernphys.) ; Wilfert, M. (Mainz U., Inst. Kernphys.) ; Windmolders, R. (Bonn U.) ; Wislicki, W. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Wollny, H. (IRFU, SPhN, Saclay) ; Zaremba, K. (Warsaw U. of Tech.) ; Zavertyaev, M. (Lebedev Inst.) ; Zemlyanichkina, E. (Dubna, JINR) ; Ziembicki, M. (Warsaw U. of Tech.) ; Zhuravlev, N. (Dubna, JINR) ; Zvyagin, A. (Munich U.) |
Publication | 2013-03-25 |
Imprint | 22 Nov 2012 |
Number of pages | 22 |
Note | Comments: 35 pages, 13 figures and 13 tables 35 pages, 13 figures and 13 tables |
In: | Phys. Rev. D 87 (2013) 052018 |
DOI | 10.1103/PhysRevD.87.052018 |
Subject category | Particle Physics - Experiment |
Accelerator/Facility, Experiment | CERN SPS ; COMPASS NA58 |
Free keywords | electroweak interaction ; QCD ; inelastic muon scattering; ; spin; ; asymmetry; ; gluon polarisation |
Abstract | The gluon polarisation in the nucleon was measured using open charm production by scattering 160 GeV/c polarised muons off longitudinally polarised protons or deuterons. The data were taken by the COMPASS collaboration between 2002 and 2007. A detailed account is given of the analysis method that includes the application of neural networks. Several decay channels of $D^0$ mesons are investigated. Longitudinal spin asymmetries of the D meson production cross-sections are extracted in bins of $D^0$ transverse momentum and energy. At leading order QCD accuracy the average gluon polarisation is determined as $(\Delta g/g)^{LO}=-0.06 \pm 0.21 (stat.) \pm 0.08 (syst.)$ at the scale $<\mu^2> \approx 13$ (GeV/c)$^2$ and an average gluon momentum fraction $<x>\approx$ 0.11. The average gluon polarisation is also obtained at next-to-leading order QCD accuracy as $(\Delta g/g) NLO = -0.13 \pm 0.15 (stat.) \pm 0.15 (syst.)$ at the scale $<\mu^2> \approx $ 13 (GeV/c)$^2$ and $<x> \approx $ 0.20. |
Copyright/License | Preprint: © 2012-2025 CERN (License: CC-BY-3.0) |