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

0426134 - ÚPT 2014 RIV US eng J - Článek v odborném periodiku
Adolph, C. - Alekseev, M. - Alexakhin, V. Yu. - Alexandrov, Yu. - Alexeev, G. D. - Amoroso, A. - Antonov, A. A. - Austregisilio, A. - Badelek, B. - Balestra, F. - Barth, J. - Baum, G. - Bedfer, Y. - Berlin, A. - Bernhard, J. - Bertini, R. - Bettinelli, M. - Bicker, K. - Bieling, J. - Birsa, R. - Bisplinghoff, J. - Bordalo, P. - Bradamante, F. - Braun, C. - Bravar, A. - Bressan, A. - Büchele, M. - Burtin, E. - Capozza, L. - Chiosso, M. - Chung, S.U. - Cicuttin, A. - Crespo, M. - Dalla Torre, S. - Das, S. - Dasgupta, S. S. - Dasgupta, S. - Denisov, O. - Dhara, L. - Donskov, S. - Doshita, N. - Duic, V. - Dünnweber, W. - Dziewiecki, M. - Efremov, A.V. - Elia, C. - Eversheim, P. - Eyrich, W. - Faessler, M. - Ferrero, A. - Filin, A. - Finger, M. - Finger jr., M. - Fischer, H. - Franco, C. - Fresne von Hohenesche, N. - Friedrich, J. - Frolov, V. - Garfagnini, R. - Gautheron, F. - Gavrichtchouk, O. - Gerassimov, S. - Geyer, R. - Giorgi, M. - Gnesi, I. - Gobbo, B. - Goertz, S. - Grabmüller, S. - Grasso, A. - Grube, B. - Gushterski, R. - Guskov, A. - Guthörl, T. - Haas, F. - von Harrach, D. - Heinsius, F. - Herrmann, F. - Hess, C. - Hinterberger, F. - Horikawa, N. - Höppner, Ch. - d'Hose, N. - Huber, S. - Ishimoto, S. - Ivanov, O. - Ivanshin, Yu. - Iwata, T. - Jahn, R. - Jary, V. - Jasinski, P. - Joosten, R. - Kabuss, E. - Kang, D. - Ketzer, B. - Khaustov, G. - Khokhlov, Y. - Kisselev, Y. - Klein, F. - Klimaszewski, K. - Koblitz, S. - Koivuniemi, J. - Kolosov, V. - Kondo, K. - Königsmann, K. - Konorov, I. - Konstantinov, V. - Korzenev, A. - Kotzinian, A. - Kouznetsov, O. - Krämer, M. - Kroumchtein, Z. - Kunne, F. - Kurek, K. - Lauser, L. - Lednev, A. - Lehmann, A. - Levorato, S. - Lichtenstadt, J. - Liska, T. - Maggiora, A. - Magnon, A. - Makke, N. - Mallot, G. - Mann, A. - Marchand, C. - Martin, A. - Marzec, J. - Matsuda, T. - Meshcheryakov, G. - Meyer, W. - Michigami, T. - Mikhailov, Y. - Morreale, A. - Mutter, A. - Nagaytsev, A. - Nagel, T. - Nerling, F. - Neubert, S. - Neyret, D. - Nikolaenko, V. - Nowak, W. D. - Nunes, A.S. - Olshevsky, A. - Ostrick, M. - Padee, A. - Panknin, R. - Panzieri, D. - Parsamyan, B. - Paul, S. - Perevalova, E. - Pesaro, G. - Peshekhonov, D. - Piragino, G. - Platchkov, S. - Pochodzalla, J. - Polak, J. - Polyakov, V. - Pretz, J. - Quaresma, M. - Quintans, C. - Rajotte, J. - Ramos, S. - Rapatsky, V. - Reicherz, G. - Rocco, E. - Rondio, E. - Rossiyskaya, N. S. - Ryabchikov, D. - Samoylenko, V. - Sandacz, A. - Sapozhnikov, M. - Sarkar, S. - Savin, I. - Sbrizzai, G. - Schiavon, P. - Schill, C. - Schlütter, T. - Schmidt, A. - Schmidt, K. - Schmiden, H. - Schmitt, L. - Schönning, K. - Schopferer, S. - Schott, M. - Shevchenko, O. - Silva, L. - Sinha, L. - Sissakian, A. - Slunecka, M. - Smirnov, G. - Sosio, S. - Sozzi, F. - Srnka, Aleš - Steiger, L. - Stolarski, M. - Sulc, M. - Sulej, R. - Suzuki, H. - Sznajder, P. - Takekawa, S. - Ter Wolbeek, J. - Tessaro, S. - Tessarotto, F. - Tkatchev, L. - Uhl, S. - Uman, I. - Vandenbroucke, M. - Virius, M. - Vlassov, N. - Wang, L. - Weisrock, T. - Wilfert, M. - Windmolders, R. - Wislicki, W. - Wollny, H. - Zaremba, K. - Zavertyaev, M. - Zemlyanichkina, E. - Zhuravlev, N. - Ziembicki, M. - Zvyagin, A.
Leading and Next-to-Leading Order Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 87, č. 5 (2013), 052018:1-22. ISSN 1550-7998
Institucionální podpora: RVO:68081731
Klíčová slova: dependent structure-function * Monte-Carlo generator
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 4.864, rok: 2013

The gluon polarization in the nucleon was measured using open charm production by scattering 160 GeV/c polarized muons off longitudinally polarized 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 polarization is determined as Delta g/g (LO) = -0.06 +/- 0: 21(stat.) +/- 0. 08(syst.) at the scale mu(2) approximate to 13 (GeV/c)(2) and an average gluon momentum fraction x approximate to 0.11. The average gluon polarization 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) approximate to 13 (GeV/c)(2) and x approximate to 0.20.
Trvalý link: http://hdl.handle.net/11104/0231891