Leading order determination of the gluon polarisation from DIS events with high-pT hadron pairs

0390817 - ÚPT 2013 RIV NL 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. - Bernhard, J. - Bertini, R. - Bettinelli, M. - Bicker, K. - Bieling, J. - Birsa, R. - Bisplinghoff, J. - Bordalo, P. - Bradamante, F. - Braun, C. - Bravar, A. - Bressan, A. - Burtin, E. - Chaberny, D. - Chiosso, M. - Chung, S.U. - Cicuttin, A. - Crespo, M. - Dalla Torre, S. - Das, S. - Dasgupta, S. 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. - Garfagnini, R. - Gautheron, F. - Gavrichtchouk, O. - Gazda, R. - 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. - Hedicke, S. - 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. - 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. - Le Goff, J.M. - Lednev, A. - Lehmann, A. - Levorato, S. - Lichtenstadt, J. - Maggiora, A. - Magnon, A. - Makke, N. - Mallot, G. - Mann, A. - Marchand, C. - Martin, A. - Marzec, J. - Matsuda, T. - Meyer, W. - Michigami, T. - Mikhailov, Y. - Moinester, M. - Morreale, A. - Mutter, A. - Nagaytsev, A. - Nagel, T. - Nassalski, J. - 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. - Pontecorvo, G. - Pretz, J. - Procureur, S. - Quaresma, M. - Quintans, C. - Rajotte, J. - Ramos, S. - Rapatsky, V. - Reicherz, G. - Richter, A. - 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, K. - 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 - Stolarski, M. - Sulc, M. - Sulej, R. - 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. - Windmolders, R. - Wislicki, W. - Wollny, H. - Zaremba, K. - Zavertyaev, M. - Zemlyanichkina, E. - Ziembicki, M. - Zhuravlev, N. - Zvyagin, A.
Leading order determination of the gluon polarisation from DIS events with high-pT hadron pairs.
Physics Letters. B. Roč. 718, č. 3 (2013), s. 922-930. ISSN 0370-2693. E-ISSN 1873-2445
Institucionální podpora: RVO:68081731
Klíčová slova: deep-inelastic-scattering * neutron spin structure * lepton-nucleon scatterin * monte-carlo generator * proton * deuteron
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 6.019, rok: 2013

We present a determination of the gluon polarisation Delta g/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with Q(2) > 1 (GeV/c)(2) including a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam scattering off a polarised (LiD)-Li-6 target. The gluon polarisation is evaluated by a Neural Network approach for three intervals of the gluon momentum fraction x(g) covering the range 0.04 < x(g) < 0.27. The values obtained at leading order in QCD do not show any significant dependence on x(g). Their average is Delta g/g = 0.125 +/- 0.060 (stat.) +/- 0.063 (syst.) at average x(g) = 0.09 and a scale of mu(2) = 3 (GeV/c)(2).
Trvalý link: http://hdl.handle.net/11104/0219657