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Leading order determination of the gluon polarisation from DIS events with high-p(T) hadron pairs

C. Adolph 1 M.G. Alekseev V.Yu. Alexakhin Yu. Alexandrov G.D. Alexeev A. Amoroso A.A. Antonov A. Austregesilo B. Badełek F. Balestra 2 J. Barth G. Baum Y. Bedfer 3 J. Bernhard R. Bertini M. Bettinelli 4 K. Bicker J. Bieling R. Birsa J. Bisplinghoff P. Bordalo F. Bradamante C. Braun A. Bravar A. Bressan 5 E. Burtin 3 D. Chaberny M. Chiosso S.U. Chung 6 A. Cicuttin 7 M.L. Crespo S. Dalla Torre S. Das 8 S.S. Dasgupta 9 O.Yu. Denisov L. Dhara S.V. Donskov N. Doshita V. Duic W. Dünnweber M. Dziewiecki A. Efremov C. Elia 10 P.D. Eversheim W. Eyrich M. Faessler A. Ferrero 3 A. Filin M. Finger H. Fischer 11 C. Franco 12 N. Du Fresne von Hohenesche J.M. Friedrich R. Garfagnini F. Gautheron O.P. Gavrichtchouk R. Gazda S. Gerassimov R. Geyer M. Giorgi I. Gnesi B. Gobbo S. Goertz S. Grabmüller A. Grasso 13 B. Grube R. Gushterski A. Guskov T. Guthörl F. Haas D. von Harrach S. Hedicke F.H. Heinsius F. Herrmann 14 C. Heß F. Hinterberger N. Horikawa Ch. Höppner N. Dʼhose 3 S. Huber 15 S. Ishimoto O. Ivanov Yu. Ivanshin T. Iwata 16 R. Jahn P. Jasinski R. Joosten 17 E. Kabuß D. Kang B. Ketzer G.V. Khaustov Yu.A. Khokhlov Yu. Kisselev F. Klein 18 K. Klimaszewski S. Koblitz J.H. Koivuniemi V.N. Kolosov K. Kondo K. Königsmann I. Konorov V.F. Konstantinov A. Korzenev 3 A.M. Kotzinian O. Kouznetsov M. Krämer 19 Z.V. Kroumchtein F. Kunne 3 K. Kurek L. Lauser J.-M. Le Goff 20, 21 A.A. Lednev A. Lehmann 22, 23, 24 S. Levorato J. Lichtenstadt A. Maggiora A. Magnon 3 N. Makke 3 G.K. Mallot A. Mann 25 C. Marchand 3 A. Martin 26 J. Marzec T. Matsuda W. Meyer T. Michigami Yu.V. Mikhailov M.A. Moinester A. Morreale 3 A. Mutter A. Nagaytsev T. Nagel J.P. Nassalski F. Nerling S. Neubert D. Neyret 3 V.I. Nikolaenko W.D. Nowak A.S. Nunes A.G. Olshevsky M. Ostrick A. Padee R. Panknin D. Panzieri B. Parsamyan S. Paul 27 E. Perevalova G. Pesaro D.V. Peshekhonov G. Piragino S. Platchkov 3 J. Pochodzalla J. Polak 28 V.A. Polyakov G. Pontecorvo J. Pretz S.L. Procureur M. Quaresma C. Quintans J.-F. Rajotte S. Ramos 29 V. Rapatsky G. Reicherz A. Richter 30 E. Rocco E. Rondio N.S. Rossiyskaya D.I. Ryabchikov V.D. Samoylenko A. Sandacz M.G. Sapozhnikov S. Sarkar 31 I.A. Savin G. Sbrizzai P. Schiavon C. Schill T. Schlüter K. Schmidt L. Schmitt 32 K. Schönning S. Schopferer M. Schott 33 O.Yu. Shevchenko L. Silva L. Sinha A.N. Sissakian M. Slunecka George Smirnov 34 S. Sosio F. Sozzi A. Srnka M. Stolarski M. Sulc R. Sulej P. Sznajder S. Takekawa J. ter Wolbeek S. Tessaro F. Tessarotto L.G. Tkatchev S. Uhl I. Uman M. Vandenbroucke 3 M. Virius N.V. Vlassov L. Wang 35 R. Windmolders W. Wiślicki H. Wollny 3 K. Zaremba M. Zavertyaev E. Zemlyanichkina M. Ziembicki N. Zhuravlev A. Zvyagin
35 MOTIVATE - Imagerie et modélisation Vasculaires, Thoraciques et Cérébrales
CREATIS - Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé : 139739
Abstract : 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).
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C. Adolph, M.G. Alekseev, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, et al.. Leading order determination of the gluon polarisation from DIS events with high-p(T) hadron pairs. Physics Letters B, Elsevier, 2013, 718 (3), pp.922. ⟨10.1016/j.physletb.2012.11.056⟩. ⟨hal-01128794⟩

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