Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high p_T

COMPASS Collaboration: C. Adolph , R. Akhunzyanov , M.G. Alexeev , G.D. Alexeev , A. Amoroso , V. Andrieux , V. Anosov , W. Augustyniak

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A. Austregesilo C.D.R. Azevedo B. Bade{\l}ek F. Balestra J. Barth R. Beck Y. Bedfer J. Bernhard K. Bicker E.R. Bielert R. Birsa J. Bisplinghoff M. Bodlak M. Boer P. Bordalo F. Bradamante C. Braun A. Bressan M. B\"uchele E. Burtin W.-C. Chang M. Chiosso I. Choi S.-U. Chung A. Cicuttin M.L. Crespo Q. Curiel S. Dalla Torre S.S. Dasgupta S. Dasgupta O.Yu. Denisov L. Dhara S.V. Donskov N. Doshita V. Duic W. D\"unnweber M. Dziewiecki A. Efremov P.D. Eversheim W. Eyrich M. Faessler A. Ferrero M. Finger M. Finger Jr. H. Fischer C. Franco N. du Fresne von Hohenesche J.M. Friedrich V. Frolov E. Fuchey F. Gautheron O.P. Gavrichtchouk S. Gerassimov F. Giordano I. Gnesi M. Gorzellik S. Grabm\"uller A. Grasso M. Grosse Perdekamp B. Grube T. Grussenmeyer A. Guskov F. Haas D. Hahne D. von Harrach R. Hashimoto F.H. Heinsius F. Herrmann F. Hinterberger N. Horikawa N. d'Hose C.-Y. Hsieh S. Huber S. Ishimoto A. Ivanov Yu. Ivanshin T. Iwata R. Jahn V. Jary R. Joosten P. J\"org E. Kabu{\ss} B. Ketzer G.V. Khaustov Yu.A. Khokhlov Yu. Kisselev F. Klein K. Klimaszewski J.H. Koivuniemi V.N. Kolosov K. Kondo K. K\"onigsmann I. Konorov V.F. Konstantinov A.M. Kotzinian O. Kouznetsov M. Kr\"amer P. Kremser F. Krinner Z.V. Kroumchtein N. Kuchinski R. Kuhn F. Kunne K. Kurek R.P. Kurjata A.A. Lednev A. Lehmann M. Levillain S. Levorato J. Lichtenstadt R. Longo A. Maggiora A. Magnon N. Makins N. Makke G.K. Mallot C. Marchand B. Marianski A. Martin J. Marzec J. Matou\v{s}ek H. Matsuda T. Matsuda G. Meshcheryakov W. Meyer T. Michigami Yu.V. Mikhailov Y. Miyachi P. Montuenga A. Nagaytsev F. Nerling D. Neyret V.I. Nikolaenko J. Nov\'y W.-D. Nowak G. Nukazuka A.S. Nunes A.G. Olshevsky I. Orlov M. Ostrick D. Panzieri B. Parsamyan S. Paul J.-C. Peng F. Pereira M. Pe\v{s}ek D.V. Peshekhonov S. Platchkov J. Pochodzalla V.A. Polyakov J. Pretz M. Quaresma C. Quintans S. Ramos C. Regali G. Reicherz C. Riedl N.S. Rossiyskaya D.I. Ryabchikov A. Rychter V.D. Samoylenko A. Sandacz C. Santos S. Sarkar I.A. Savin G. Sbrizzai P. Schiavon K. Schmidt H. Schmieden K. Sch\"onning S. Schopferer A. Selyunin O.Yu. Shevchenko L. Silva L. Sinha S. Sirtl M. Slunecka F. Sozzi A. Srnka M. Stolarski M. Sulc H. Suzuki A. Szabelski T. Szameitat P. Sznajder S. Takekawa S. Tessaro F. Tessarotto F. Thibaud F. Tosello V. Tskhay S. Uhl J. Veloso M. Virius T. Weisrock M. Wilfert J. Ter Wolbeek K. Zaremba M. Zavertyaev E. Zemlyanichkina M. Ziembicki A. Zink

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classification ✦ hep-ex hep-ph

keywords asymmetrieshadrondoublelongitudinalmathrmnucleonpolarisedrange

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We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/$\it c$ or 200 GeV/$\it c$ impinging on polarised $\mathrm{{}^6LiD}$ or $\mathrm{NH_3}$ targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation $\Delta G$ inside the nucleon in the range of the nucleon momentum fraction carried by gluons $0.05 < x_g < 0.2$.

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Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high p_T

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