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

6533b833fe1ef96bd129b9d1

RESEARCH PRODUCT

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

M. Grosse Perdekamp N.s. Rossiyskaya I.a. Savin Jen-chieh Peng A. Grasso M. Wilfert C. Quintans S. Grabmüller R. Kuhn K. Klimaszewski O.yu. Denisov F. Kunne P.d. Eversheim S. Takekawa R. Beck R. Akhunzyanov G. D. Alexeev M. Chiosso R. Hashimoto R.p. Kurjata J. Pochodzalla P. Bordalo H. Suzuki C.d.r. Azevedo F. Pereira K. Kondo R. Jahn K. Kurek O. Kouznetsov Franco Bradamante V. Anosov C. Regali Andres Cicuttin Fabrice Gautheron P. Schiavon G.v. Meshcheryakov P. Montuenga S. Gerassimov S. Gerassimov N. Horikawa F. Tosello B. Marianski O.p. Gavrichtchouk Martin Bodlak L. Sinha T. Matsuda A. Zink I. Orlov V.d. Samoylenko G. Reicherz Yu. V. Mikhailov S. Sirtl Celso Augusto Guimarães Santos J. Pretz Bakur Parsamyan I. Konorov I. Konorov S.s. Dasgupta S. Dalla Torre H. Matsuda M. Boer L. Dhara C. Braun S. Tessaro D. Hahne M.g. Alexeev M. V. Zavertyaev S. Platchkov Z.v. Kroumchtein N. Du Fresne Von Hohenesche M. Levillain C.-y. Hsieh V. Frolov V. Frolov Soumen Paul T. Szameitat B. Badelek S. Uhl Michal Dziewiecki A. Magnon C. Marchand C. Adolph P. Kremser D.i. Ryabchikov B. Ketzer B. Ketzer Yu.a. Khokhlov A. Srnka F. Nerling R. Joosten S. Sarkar G. Nukazuka Andrea Ferrero M. Faessler M. Stolarski M. Gorzellik S. V. Donskov M. Pešek I. J. Choi V.i. Nikolaenko Yu. Kisselev A.s. Nunes Johannes Bernhard Johannes Bernhard A. Guskov D. Panzieri Janusz Marzec A.g. Olshevsky M. Ostrick T. Grussenmeyer S. Dasgupta A. Austregesilo B. Grube E.r. Bielert F. Krinner Laura Silva A.v. Efremov K. Zaremba V.a. Polyakov Andrea Bressan Miroslav Sulc F. Hinterberger W. Augustyniak S. Ramos J.f.c.a. Veloso Y. Miyachi A.a. Lednev G. Sbrizzai Frank Klein M. Virius Q. Curiel P. Sznajder D. Neyret T. Michigami H. Schmieden A. Amoroso M. Büchele A. Lehmann J.m. Friedrich J. Nový J. Nový N. Kuchinski J.h. Koivuniemi K. Königsmann S.-u. Chung R. Birsa J. Bisplinghoff A. Sandacz K. Bicker K. Bicker A. Maggiora Yu. Ivanshin S. Huber V. Duic Takahiro Iwata W. Dünnweber E. Zemlyanichkina K. Schmidt François Herrmann M. Ziembicki P. Jörg Norihiro Doshita N. D'hose A. Rychter Aram Kotzinian R. Longo V.n. Kolosov K. Schönning F. H. Heinsius O.yu. Shevchenko S. Levorato M. Slunecka Alexandr Selyunin G.v. Khaustov J. Ter Wolbeek W. Eyrich C. Franco Naomi C R Makins Nour Makke W. C. Chang Y. Bedfer F. Tessarotto Federica Sozzi M. Krämer S. Schopferer M. Quaresma M. Finger W.-d. Nowak D.v. Peshekhonov Anne-laure Martin E. Fuchey I. Gnesi F. Giordano E. Burtin Jan Matousek V.f. Konstantinov J. Lichtenstadt S. Ishimoto H. Fischer V. Andrieux Adam Szabelski V. Tskhay A. Nagaytsev F. Balestra W. Meyer Maria Liz Crespo V. Jary Andrew Ivanov D. Von Harrach F. Thibaud J. Barth Gerhard K. Mallot T. Weisrock F. Haas C. Riedl E. M. Kabuß

subject

Nuclear and High Energy Physics Particle physics Photon High pT Hadron Nuclear Theory COMPASS; Deep inelastic scattering; Double spin asymmetry; High pT; δG; Nuclear and High Energy Physics FOS: Physical sciences [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]Double spin asymmetry Lambda COMPASS 01 natural sciences High Energy Physics - Experiment Nuclear physics High Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)0103 physical sciences δG 010306 general physics Nuclear Experiment Physics Muon 010308 nuclear & particles physics Deep inelastic scattering lcsh:QC1-999 Gluon High Energy Physics - Phenomenology Deuterium High Energy Physics::Experiment Nucleon lcsh:Physics Particle Physics - Experiment Deep inelastic scattering

description

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 $0.05 < x_g < 0.2$. We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q2<1(GeV/c)2 for transverse hadron momenta pT in the range 1 GeV/c to 4 GeV/c . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/c or 200 GeV/c impinging on polarised 6 LiD or NH 3 targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation Δ G inside the nucleon in the range of the nucleon momentum fraction carried by gluons 0.05<xg<0.2 . 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 $0.05 < x_g < 0.2$.

year	journal	country	edition	language
2015-09-11

10.1016/j.physletb.2015.12.035 https://hdl.handle.net/10400.26/26922