Gluon polarisation in the nucleon and longitudinal double spin asymmetries from open charm muoproduction
Articolo
Data di Pubblicazione:
2009
Abstract:
The gluon polarisation in the nucleon has been determined by detecting charm production via D0 meson decay to charged K and π in polarised muon scattering off a longitudinally polarised deuteron target. The data were taken by the COMPASS Collaboration at CERN between 2002 and 2006 and correspond to an integrated luminosity of 2.8 fb−1. The dominant underlying process of charm production is the photon–gluon fusion to a View the MathML source pair. A leading order QCD approach gives an average gluon polarisation of left angle bracketΔg/gright-pointing angle bracketx=−0.49±0.27(stat)±0.11(syst) at a scale μ2≈13 (GeV/c)2 and at an average gluon momentum fraction left angle bracketxright-pointing angle bracket≈0.11. The longitudinal cross-section asymmetry for D0 production is presented in bins of the transverse momentum and the energy of the D0 meson.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Inelastic muon scattering; Spin; Asymmetry; Gluon polarisation
Elenco autori:
M. Alekseevad; V.Yu.Alexakhinh; Yu. Alexandrovp; G.D. Alexeevh; A. Amoroso; A. Austregisiliok; r; B. Badełekae; F. Balestra; J. Ballw; J. Barthd; G. Bauma; Y. Bedferw; J. Bernhardn; R. Bertiniab; M. Bettinelliq; R. Birsay; J. Bisplinghoffc; P. Bordalom; 1; F. Bradamantez; A. Bravary; A. Bressanz; G. Bronaae; E. Burtinw; M.P. Bussa; A. Chapiroaa; M. Chiosso; S.U. Chungr; A. Cicuttiny; aa; M. Colantoni; M.L. Crespoy; ; S. Dalla Torrey; T. Dafniw; S. Dasg; S.S. Dasguptaf; O.Yu. Denisovac; 2; L. Dharag; V. Diazy; ; A.M. Dinkelbachr; S.V. Donskovv; N. Doshitab; ag; V. Duicz; W. Dünnweberq; A. Efremovh; A. El Alaouiw; P.D. Eversheimc; W. Eyrichi; M. Faesslerq; A. Ferrero; k; M. Fingert; M. Finger Jr.h; H. Fischerj; C. Francom; J.M. Friedrichr; R. Garfagnini; F. Gautherona; O.P. Gavrichtchoukh; R. Gazdaae; S. Gerassimovp; r; R. Geyerq; M. Giorgiz; B. Gobboy; S. Goertzb; d; S. Grabmüllerr; O.A. Grajekae; A. Grasso; B. Gruber; R. Gushterskih; A. Guskovh; F. Haasr; R. Hagemannj; D. von Harrachn; T. Hasegawao; J. Heckmannb; F.H. Heinsiusj; R. Hermannn; F. Herrmannj; C. Heßb; F. Hinterbergerc; M. von Hodenbergj; N. Horikawas; 3; Ch. Höppnerr; N. d'Hosew; C. Ilgnerk; q; S. Ishimotos; 4; O. Ivanovh; Yu. Ivanshinh; T. Iwataag; R. Jahnc; P. Jasinskin; G. Jegouw; R. Joostenc; E. Kabußn; W. Käferj; D. Kangj; B. Ketzerr; G.V. Khaustovv; Yu.A. Khokhlovv; J. Kieferj; Yu. Kisseleva; F. Kleind; K. Klimaszewskiae; S. Koblitzn; J.H. Koivuniemib; V.N. Kolosovv; E.V. Komissarovh; 5; K. Kondob; K. Königsmannj; I. Konorovp; r; V.F. Konstantinovv; A. Korzenevn; 2; A.M. Kotzinianh; O. Kouznetsovh; K. Kowalikae; M. Krämerr; A. Kralu; Z.V. Kroumchteinh; R. Kuhnr; F. Kunnew; K. Kurekae; J.M. Le Goffw; A.A. Lednevv; A. Lehmanni; S. Levoratoz; J. Lichtenstadtx; T. Liskau; A. Maggiora; M. Maggiora; A. Magnonw; G.K. Mallotk; A. Mannr; C. Marchandw; J. Marronclew; A. Martinz; J. Marzecaf; F. Massmannc; T. Matsudao; A.N. Maximovh; 5; W. Meyerb; T. Michigamiag; Yu.V. Mikhailovv; M.A. Moinesterx; A. Mutterj; n; A. Nagaytsevh; T. Nagelr; J. Nassalskiae; S. Negrinic; F. Nerlingj; S. Neubertr; D. Neyretw; V.I. Nikolaenkov; A.G. Olshevskyh; M. Ostrickd; n; A. Padeeaf; R. Panknind; S. Panebiancow; D. Panzieri; B. Parsamyanab; S. Paulr; B. Pawlukiewicz-Kaminskaae; E. Perevalovah; G. Pesaroz; D.V. Peshekhonovh; G. Piragino; S. Platchkovw; J. Pochodzallan; J. Polakl; z; V.A. Polyakovv; G. Pontecorvoh; J. Pretzd; C. Quintansm; J.-F. Rajotteq; S. Ramosm; 1; V. Rapatskyh; G. Reicherzb; D. Reggianik; A. Richteri; F. Robinetw; E. Roccoab; E. Rondioae; D.I. Ryabchikovv; V.D. Samoylenkov; A. Sandaczae; H. Santosm; 1; M.G. Sapozhnikovh; S. Sarkarg; I.A. Savinh; G. Sbrizzaz; P. Schiavonz; C. Schillj; L. Schmittr; 6; W. Schröderi; O.Yu. Shevchenkoh; H.-W. Siebertn; L. Silvam; L. Sinhag; A.N. Sissakianh; M. Sluneckah; G.I. Smirnovh; S. Sosio; F. Sozziz; A. Srnkae; M. Stolarskiae; k; M. Sulcl; R. Sulejaf; S. Takekawaz; S. Tessaroy; F. Tessarottoy; A. Teufeli; L.G. Tkatchevh; G. Venugopalc; M. Viriusu; N.V. Vlassovh; A. Vossenj; Q. Weitzelr; K. Wenzlj; R. Windmoldersd; W. Wiślickiae; H. Wollnyj; K. Zarembaaf; M. Zavertyaevp; E. Zemlyanichkinah; M. Ziembickiaf; J. Zhaon; y; N. Zhuravlevh and A. Zvyaginq
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