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 14 D. von Harrach S. Hedicke F.H. Heinsius F. Herrmann 15 C. Heß F. Hinterberger N. Horikawa Ch. Höppner N. Dʼhose 3 S. Huber 16 S. Ishimoto O. Ivanov Yu. Ivanshin T. Iwata 17 R. Jahn P. Jasinski R. Joosten 18 E. Kabuß D. Kang B. Ketzer G.V. Khaustov Yu.A. Khokhlov Yu. Kisselev F. Klein 19 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 20 Z.V. Kroumchtein F. Kunne 3 K. Kurek L. Lauser J.-M. Le Goff 21, 22 A.A. Lednev A. Lehmann 23, 24, 25 S. Levorato J. Lichtenstadt A. Maggiora A. Magnon 3 N. Makke 3 G.K. Mallot A. Mann 26 C. Marchand 3 A. Martin 27 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 28 E. Perevalova G. Pesaro D.V. Peshekhonov G. Piragino S. Platchkov 3 J. Pochodzalla J. Polak 29 V.A. Polyakov G. Pontecorvo J. Pretz S.L. Procureur M. Quaresma C. Quintans J.-F. Rajotte S. Ramos 30 V. Rapatsky G. Reicherz A. Richter 31 E. Rocco E. Rondio N.S. Rossiyskaya D.I. Ryabchikov V.D. Samoylenko A. Sandacz M.G. Sapozhnikov S. Sarkar 32 I.A. Savin G. Sbrizzai P. Schiavon C. Schill T. Schlüter K. Schmidt L. Schmitt 33 K. Schönning S. Schopferer M. Schott 34 O.Yu. Shevchenko L. Silva L. Sinha A.N. Sissakian M. Slunecka George Smirnov 35 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 36 R. Windmolders W. Wiślicki H. Wollny 3 K. Zaremba M. Zavertyaev E. Zemlyanichkina M. Ziembicki N. Zhuravlev A. Zvyagin
36 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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