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Leading and Next-to-Leading Order Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction

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arxiv 1211.6849 v2 pith:U6VFDEJW submitted 2012-11-29 hep-ex

Leading and Next-to-Leading Order Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction

C. Adolph , M. G. Alekseev , V. Yu. Alexakhin , Yu. Alexandrov , G. D. Alexeev , A. Amoroso , A. A. Antonov , A. Austregesilo
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B. Badelek F. Balestra J. Barth G. Baum Y. Bedfer A. Berlin J. Bernhard R. Bertini M. Bettinelli K. Bicker J. Bieling R. Birsa J. Bisplinghoff P. Bordalo F. Bradamante C. Braun A. Bravar A. Bressan M. Buechele E. Burtin L. Capozza M. Chiosso S. U. Chung A. Cicuttin M. L. Crespo S. Dalla Torre S. Das S. S. Dasgupta S. Dasgupta O. Yu. Denisov L. Dhara S. V. Donskov N. Doshita V. Duic W. Duennweber M. Dziewiecki A. Efremov C. Elia P. D. Eversheim W. Eyrich M. Faessler A. Ferrero A. Filin M. Finger M. Finger Jr H. Fischer C. Franco N. du Fresne von Hohenesche J. M. Friedrich V. Frolov R. Garfagnini F. Gautheron O. P. Gavrichtchouk S. Gerassimov R. Geyer M. Giorgi I. Gnesi B. Gobbo S. Goertz S. Grabmueller A. Grasso B. Grube R. Gushterski A. Guskov T. Guthoerl F. Haas D. von Harrach F. H. Heinsius F. Herrmann C. Hess F. Hinterberger N. Horikawa Ch. Hoeppner N. d'Hose S. Huber S. Ishimoto O. Ivanov Yu. Ivanshin T. Iwata R. Jahn V. Jary P. Jasinski R. Joosten E. Kabuss D. Kang B. Ketzer G. V. Khaustov Yu. A. Khokhlov Yu. Kisselev F. Klein K. Klimaszewski S. Koblitz J. H. Koivuniemi V. N. Kolosov K. Kondo K. Koenigsmann I. Konorov V. F. Konstantinov A. Korzenev A. M. Kotzinian O. Kouznetsov M. Kraemer Z. V. Kroumchtein F. Kunne K. Kurek L. Lauser A. A. Lednev A. Lehmann S. Levorato J. Lichtenstadt T. Liska A. Maggiora A. Magnon N. Makke G. K. Mallot A. Mann C. Marchand A. Martin J. Marzec T. Matsuda G. Meshcheryakov W. Meyer T. Michigami Yu. V. Mikhailov A. Morreale A. Mutter A. Nagaytsev T. Nagel F. Nerling S. Neubert D. Neyret V. I. Nikolaenko W.-D. Nowak A. S. Nunes A. G. Olshevsky M. Ostrick A. Padee R. Panknin D. Panzieri B. Parsamyan S. Paul E. Perevalova G. Pesaro D. V. Peshekhonov G. Piragino S. Platchkov J. Pochodzalla J. Polak V. A. Polyakov J. Pretz M. Quaresma C. Quintans J.-F. Rajotte S. Ramos V. Rapatsky G. Reicherz E. Rocco E. Rondio N. S. Rossiyskaya D. I. Ryabchikov V. D. Samoylenko A. Sandacz M. G. Sapozhnikov S. Sarkar I. A. Savin G. Sbrizzai P. Schiavon C. Schill T. Schlueter A. Schmidt K. Schmidt L. Schmitt H. Schmieden K. Schoenning S. Schopferer M. Schott O. Yu. Shevchenko L. Silva L. Sinha A. N. Sissakian M. Slunecka G. I. Smirnov S. Sosio F. Sozzi A. Srnka L. Steiger M. Stolarski M. Sulc R. Sulej H. Suzuki P. Sznajder S. Takekawa J. Ter Wolbeek S. Tessaro F. Tessarotto L. G. Tkatchev S. Uhl I. Uman M. Vandenbroucke M. Virius N. V. Vlassov L. Wang T. Weisrock M. Wilfert R. Windmolders W. Wislicki H. Wollny K. Zaremba M. Zavertyaev E. Zemlyanichkina M. Ziembicki N. Zhuravlev A. Zvyagin
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classification hep-ex
keywords gluonpolarisationaverageorderaccuracyasymmetriescharmdelta
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 +/- 0.21 (stat.) +/- 0.08 (syst.) at the scale <mu^2> ~13 (GeV/c)^2 and an average gluon momentum fraction <x>~ 0.11. For the first time, the average gluon polarisation is also obtained at next-to-leading order QCD accuracy as (Delta g/G)^NLO = -0.13 +/- 0.15 (stat.) +/- 0.15 (syst.) at the scale <mu^2> ~ 13 (\GeV/c)^2 and <x> ~ 0.20.

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