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Abstract
Longitudinal double-spin asymmetries of charged hadrons with high transverse momentum pT have been measured in electroproduction using the Hermes detector at Hera. Processes involving gluons in the nucleon have been enhanced relative to others by selecting hadrons with pT typically above 1 GeV. In this kinematic domain the gluon polarization has been extracted in leading order making use of the model embedded in the Monte Carlo Generator Pythia 6.2. The gluon polarization obtained from single inclusive hadrons in the pT range 1 GeV < pT < 2.5 GeV using a deuterium target is at a scale and . For different final states and kinematic domains, consistent values of have been found within statistical uncertainties using hydrogen and deuterium targets.
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Details
Title
Leading-order determination of the gluon polarization from high-pT hadron electroproduction
Author
Airapetian, A 1 ; Akopov, N 2 ; Akopov, Z 3 ; Aschenauer, E C 4 ; Augustyniak, W 5 ; Avakian, R 2 ; Avetissian, A 2 ; Avetisyan, E 3 ; Belostotski, S 6 ; Bianchi, N 7 ; Blok, H P 8 ; Böttcher, H 9 ; Bonomo, C 10 ; Borissov, A 3 ; Bryzgalov, V 11 ; Capiluppi, M 10 ; Capitani, G P 7 ; Cisbani, E 12 ; Contalbrigo, M 10 ; Dalpiaz, P F 10 ; Deconinck, W 13 ; De, Leo R 14 ; Demey, M 15 ; De, Nardo L 16 ; De Sanctis E 7 ; Diefenthaler, M 17 ; Di, Nezza P 7 ; Dreschler, J 15 ; Düren, M 18 ; Ehrenfried, M 18 ; Elbakian, G 2 ; Ellinghaus, F 19 ; Elschenbroich, U 20 ; Fabbri, R 9 ; Fantoni, A 7 ; Felawka, L 21 ; Frullani, S 12 ; Gabbert, D 22 ; Gapienko, G 11 ; Gapienko, V 11 ; Garibaldi, F 12 ; Gavrilov, G 23 ; Gharibyan, V 2 ; Giordano, F 24 ; Gliske, S 25 ; Guler, H 9 ; Hadjidakis, C 26 ; Hartig, M 27 ; Hasch, D 7 ; Hasegawa, T 28 ; Hill, G 29 ; Hillenbrand, A 9 ; Hoek, M 29 ; Holler, Y 3 ; Hommez, B 20 ; Hristova, I 9 ; Ivanilov, A 11 ; Jackson, H E 30 ; Kaiser, R 29 ; Keri, T 31 ; Kinney, E 32 ; Kisselev, A 6 ; Kopytin, M 9 ; Korotkov, V 11 ; Kravchenko, P 6 ; Lagamba, L 14 ; Lamb, R 33 ; Lapikás, L 15 ; Lehmann, I 29 ; Lenisa, P 10 ; Liebing, P 34 ; Linden-Levy, L A 33 ; Lorenzon, W 25 ; Lu X-R 28 ; Maiheu, B 20 ; Makins, N C, R 33 ; Marianski, B 5 ; Marukyan, H 2 ; Mexner, V 15 ; Miller, C A 21 ; Miyachi, Y 28 ; Muccifora, V 7 ; Murray, M 29 ; Mussgiller, A 35 ; Nappi, E 14 ; Naryshkin, Y 6 ; Nass, A 36 ; Negodaev, M 9 ; W-D, Nowak 9 ; Pappalardo, L L 10 ; Perez-Benito, R 18 ; Pickert, N 36 ; Raithel, M 36 ; Reggiani, D 36 ; Reimer, P E 30 ; Reischl, A 15 ; Reolon, A R 7 ; Riedl, C 9 ; Rith, K 36 ; Rock, S E 37 ; Rosner, G 29 ; Rostomyan, A 3 ; Rubin, J 38 ; Salomatin, Y 11 ; Schäfer, A 39 ; Schnell, G 40 ; Schüler, K P 3 ; Seitz, B 29 ; Shearer, C 29 ; T-A, Shibata 28 ; Shutov, V 41 ; Stancari, M 10 ; Statera, M 10 ; Steijger J J M 15 ; Stewart, J 9 ; Stinzing, F 36 ; Taroian, S 2 ; Tchuiko, B 11 ; Trzcinski, A 5 ; Tytgat, M 20 ; Vandenbroucke, A 20 ; van der Nat P B 15 ; van der Steenhoven G 15 ; Van Haarlem Y 42 ; Van Hulse C 20 ; Varanda, M 3 ; Veretennikov, D 6 ; Vilardi, I 14 ; Vogel, C 36 ; Wang, S 43 ; Yaschenko, S 44 ; Ye H 43 ; Ye Z 3 ; Yu W 18 ; Zeiler, D 36 ; Zihlmann, B 20 ; Zupranski, P 5
1 Universität Gießen, Physikalisches Institut, Gießen, Germany (GRID:grid.8664.c) (ISNI:0000000121658627); University of Michigan, Randall Laboratory of Physics, Ann Arbor, U.S.A. (GRID:grid.214458.e) (ISNI:0000000086837370)
2 Yerevan Physics Institute, Yerevan, Armenia (GRID:grid.48507.3e) (ISNI:0000000404827128)
3 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
4 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Brookhaven National Laboratory, Upton, U.S.A. (GRID:grid.202665.5) (ISNI:0000000121884229)
5 Andrzej Soltan Institute for Nuclear Studies, Warsaw, Poland (GRID:grid.450295.f) (ISNI:0000000109410848)
6 Petersburg Nuclear Physics Institute, Gatchina, Russia (GRID:grid.430219.d) (ISNI:0000000406193376)
7 Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000000406480236)
8 National Institute for Subatomic Physics (Nikhef), Amsterdam, The Netherlands (GRID:grid.420012.5) (ISNI:0000000406462193); VU University, Department of Physics & Astronomy, Amsterdam, The Netherlands (GRID:grid.12380.38) (ISNI:0000000417549227)
9 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
10 Università di Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Ferrara, Italy (GRID:grid.8484.0) (ISNI:0000000417572064)
11 Institute for High Energy Physics, Protvino, Russia (GRID:grid.424823.b) (ISNI:000000040620440X)
12 Istituto Superiore di Sanità, Istituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Roma, Italy (GRID:grid.416651.1) (ISNI:0000000091206856)
13 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); University of Michigan, Randall Laboratory of Physics, Ann Arbor, U.S.A. (GRID:grid.214458.e) (ISNI:0000000086837370); Massachusetts Institute of Technology, Cambridge, U.S.A. (GRID:grid.116068.8) (ISNI:0000000123412786)
14 Sezione di Bari, Istituto Nazionale di Fisica Nucleare, Bari, Italy (GRID:grid.470190.b)
15 National Institute for Subatomic Physics (Nikhef), Amsterdam, The Netherlands (GRID:grid.420012.5) (ISNI:0000000406462193)
16 University of Michigan, Randall Laboratory of Physics, Ann Arbor, U.S.A. (GRID:grid.214458.e) (ISNI:0000000086837370); DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
17 University of Illinois, Department of Physics, Urbana, U.S.A. (GRID:grid.35403.31) (ISNI:0000000419369991); Universität Erlangen-Nürnberg, Physikalisches Institut, Erlangen, Germany (GRID:grid.5330.5) (ISNI:0000000121073311)
18 Universität Gießen, Physikalisches Institut, Gießen, Germany (GRID:grid.8664.c) (ISNI:0000000121658627)
19 University of Colorado, Nuclear Physics Laboratory, Boulder, U.S.A. (GRID:grid.266190.a) (ISNI:0000000096214564); Universität Mainz, Institut für Physik, Mainz, Germany (GRID:grid.5802.f) (ISNI:0000000119417111)
20 University of Gent, Department of Subatomic and Radiation Physics, Gent, Belgium (GRID:grid.5342.0) (ISNI:0000000120697798)
21 TRIUMF, Vancouver, Canada (GRID:grid.232474.4) (ISNI:0000000107059791)
22 University of Gent, Department of Subatomic and Radiation Physics, Gent, Belgium (GRID:grid.5342.0) (ISNI:0000000120697798); DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
23 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Petersburg Nuclear Physics Institute, Gatchina, Russia (GRID:grid.430219.d) (ISNI:0000000406193376); TRIUMF, Vancouver, Canada (GRID:grid.232474.4) (ISNI:0000000107059791)
24 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Università di Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Ferrara, Italy (GRID:grid.8484.0) (ISNI:0000000417572064)
25 University of Michigan, Randall Laboratory of Physics, Ann Arbor, U.S.A. (GRID:grid.214458.e) (ISNI:0000000086837370)
26 Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000000406480236); IPN (UMR 8608) CNRS/IN2P3 - Université Paris-Sud, Orsay, France (GRID:grid.5842.b) (ISNI:0000000121712558)
27 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Universität Frankfurt a.M., Institut für Kernphysik, Frankfurt a.M., Germany (GRID:grid.7839.5) (ISNI:0000 0004 1936 9721)
28 Tokyo Institute of Technology, Department of Physics, Tokyo, Japan (GRID:grid.32197.3e) (ISNI:0000000121792105)
29 University of Glasgow, Department of Physics and Astronomy, Glasgow, U.K. (GRID:grid.8756.c) (ISNI:000000012193314X)
30 Argonne National Laboratory, Physics Division, Argonne, U.S.A. (GRID:grid.187073.a) (ISNI:0000000119394845)
31 University of Glasgow, Department of Physics and Astronomy, Glasgow, U.K. (GRID:grid.8756.c) (ISNI:000000012193314X); Universität Gießen, Physikalisches Institut, Gießen, Germany (GRID:grid.8664.c) (ISNI:0000000121658627)
32 University of Colorado, Nuclear Physics Laboratory, Boulder, U.S.A. (GRID:grid.266190.a) (ISNI:0000000096214564)
33 University of Illinois, Department of Physics, Urbana, U.S.A. (GRID:grid.35403.31) (ISNI:0000000419369991)
34 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); University of Bremen, Institute of Environmental Physics and Remote Sensing, Bremen, Germany (GRID:grid.7704.4) (ISNI:0000000122974381)
35 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Universität Erlangen-Nürnberg, Physikalisches Institut, Erlangen, Germany (GRID:grid.5330.5) (ISNI:0000000121073311)
36 Universität Erlangen-Nürnberg, Physikalisches Institut, Erlangen, Germany (GRID:grid.5330.5) (ISNI:0000000121073311)
37 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); SLAC National Accelerator Laboratory, Menlo Park, U.S.A. (GRID:grid.445003.6) (ISNI:0000000107257771)
38 Argonne National Laboratory, Physics Division, Argonne, U.S.A. (GRID:grid.187073.a) (ISNI:0000000119394845); University of Illinois, Department of Physics, Urbana, U.S.A. (GRID:grid.35403.31) (ISNI:0000000419369991)
39 Universität Regensburg, Institut für Theoretische Physik, Regensburg, Germany (GRID:grid.7727.5) (ISNI:0000000121905763)
40 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Tokyo Institute of Technology, Department of Physics, Tokyo, Japan (GRID:grid.32197.3e) (ISNI:0000000121792105)
41 Joint Institute for Nuclear Research, Dubna, Russia (GRID:grid.33762.33) (ISNI:0000000406204119)
42 University of Gent, Department of Subatomic and Radiation Physics, Gent, Belgium (GRID:grid.5342.0) (ISNI:0000000120697798); Carnegie Mellon University, Pittsburgh, U.S.A. (GRID:grid.147455.6) (ISNI:0000000120970344)
43 Peking University, School of Physics, Beijing, China (GRID:grid.11135.37) (ISNI:0000000122569319)
44 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Universität Erlangen-Nürnberg, Physikalisches Institut, Erlangen, Germany (GRID:grid.5330.5) (ISNI:0000000121073311)
1 Universität Gießen, Physikalisches Institut, Gießen, Germany (GRID:grid.8664.c) (ISNI:0000000121658627); University of Michigan, Randall Laboratory of Physics, Ann Arbor, U.S.A. (GRID:grid.214458.e) (ISNI:0000000086837370)
2 Yerevan Physics Institute, Yerevan, Armenia (GRID:grid.48507.3e) (ISNI:0000000404827128)
3 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
4 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Brookhaven National Laboratory, Upton, U.S.A. (GRID:grid.202665.5) (ISNI:0000000121884229)
5 Andrzej Soltan Institute for Nuclear Studies, Warsaw, Poland (GRID:grid.450295.f) (ISNI:0000000109410848)
6 Petersburg Nuclear Physics Institute, Gatchina, Russia (GRID:grid.430219.d) (ISNI:0000000406193376)
7 Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000000406480236)
8 National Institute for Subatomic Physics (Nikhef), Amsterdam, The Netherlands (GRID:grid.420012.5) (ISNI:0000000406462193); VU University, Department of Physics & Astronomy, Amsterdam, The Netherlands (GRID:grid.12380.38) (ISNI:0000000417549227)
9 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
10 Università di Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Ferrara, Italy (GRID:grid.8484.0) (ISNI:0000000417572064)
11 Institute for High Energy Physics, Protvino, Russia (GRID:grid.424823.b) (ISNI:000000040620440X)
12 Istituto Superiore di Sanità, Istituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Roma, Italy (GRID:grid.416651.1) (ISNI:0000000091206856)
13 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); University of Michigan, Randall Laboratory of Physics, Ann Arbor, U.S.A. (GRID:grid.214458.e) (ISNI:0000000086837370); Massachusetts Institute of Technology, Cambridge, U.S.A. (GRID:grid.116068.8) (ISNI:0000000123412786)
14 Sezione di Bari, Istituto Nazionale di Fisica Nucleare, Bari, Italy (GRID:grid.470190.b)
15 National Institute for Subatomic Physics (Nikhef), Amsterdam, The Netherlands (GRID:grid.420012.5) (ISNI:0000000406462193)
16 University of Michigan, Randall Laboratory of Physics, Ann Arbor, U.S.A. (GRID:grid.214458.e) (ISNI:0000000086837370); DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
17 University of Illinois, Department of Physics, Urbana, U.S.A. (GRID:grid.35403.31) (ISNI:0000000419369991); Universität Erlangen-Nürnberg, Physikalisches Institut, Erlangen, Germany (GRID:grid.5330.5) (ISNI:0000000121073311)
18 Universität Gießen, Physikalisches Institut, Gießen, Germany (GRID:grid.8664.c) (ISNI:0000000121658627)
19 University of Colorado, Nuclear Physics Laboratory, Boulder, U.S.A. (GRID:grid.266190.a) (ISNI:0000000096214564); Universität Mainz, Institut für Physik, Mainz, Germany (GRID:grid.5802.f) (ISNI:0000000119417111)
20 University of Gent, Department of Subatomic and Radiation Physics, Gent, Belgium (GRID:grid.5342.0) (ISNI:0000000120697798)
21 TRIUMF, Vancouver, Canada (GRID:grid.232474.4) (ISNI:0000000107059791)
22 University of Gent, Department of Subatomic and Radiation Physics, Gent, Belgium (GRID:grid.5342.0) (ISNI:0000000120697798); DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453)
23 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Petersburg Nuclear Physics Institute, Gatchina, Russia (GRID:grid.430219.d) (ISNI:0000000406193376); TRIUMF, Vancouver, Canada (GRID:grid.232474.4) (ISNI:0000000107059791)
24 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Università di Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Ferrara, Italy (GRID:grid.8484.0) (ISNI:0000000417572064)
25 University of Michigan, Randall Laboratory of Physics, Ann Arbor, U.S.A. (GRID:grid.214458.e) (ISNI:0000000086837370)
26 Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, Italy (GRID:grid.463190.9) (ISNI:0000000406480236); IPN (UMR 8608) CNRS/IN2P3 - Université Paris-Sud, Orsay, France (GRID:grid.5842.b) (ISNI:0000000121712558)
27 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Universität Frankfurt a.M., Institut für Kernphysik, Frankfurt a.M., Germany (GRID:grid.7839.5) (ISNI:0000 0004 1936 9721)
28 Tokyo Institute of Technology, Department of Physics, Tokyo, Japan (GRID:grid.32197.3e) (ISNI:0000000121792105)
29 University of Glasgow, Department of Physics and Astronomy, Glasgow, U.K. (GRID:grid.8756.c) (ISNI:000000012193314X)
30 Argonne National Laboratory, Physics Division, Argonne, U.S.A. (GRID:grid.187073.a) (ISNI:0000000119394845)
31 University of Glasgow, Department of Physics and Astronomy, Glasgow, U.K. (GRID:grid.8756.c) (ISNI:000000012193314X); Universität Gießen, Physikalisches Institut, Gießen, Germany (GRID:grid.8664.c) (ISNI:0000000121658627)
32 University of Colorado, Nuclear Physics Laboratory, Boulder, U.S.A. (GRID:grid.266190.a) (ISNI:0000000096214564)
33 University of Illinois, Department of Physics, Urbana, U.S.A. (GRID:grid.35403.31) (ISNI:0000000419369991)
34 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); University of Bremen, Institute of Environmental Physics and Remote Sensing, Bremen, Germany (GRID:grid.7704.4) (ISNI:0000000122974381)
35 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Universität Erlangen-Nürnberg, Physikalisches Institut, Erlangen, Germany (GRID:grid.5330.5) (ISNI:0000000121073311)
36 Universität Erlangen-Nürnberg, Physikalisches Institut, Erlangen, Germany (GRID:grid.5330.5) (ISNI:0000000121073311)
37 DESY, Hamburg, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); SLAC National Accelerator Laboratory, Menlo Park, U.S.A. (GRID:grid.445003.6) (ISNI:0000000107257771)
38 Argonne National Laboratory, Physics Division, Argonne, U.S.A. (GRID:grid.187073.a) (ISNI:0000000119394845); University of Illinois, Department of Physics, Urbana, U.S.A. (GRID:grid.35403.31) (ISNI:0000000419369991)
39 Universität Regensburg, Institut für Theoretische Physik, Regensburg, Germany (GRID:grid.7727.5) (ISNI:0000000121905763)
40 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Tokyo Institute of Technology, Department of Physics, Tokyo, Japan (GRID:grid.32197.3e) (ISNI:0000000121792105)
41 Joint Institute for Nuclear Research, Dubna, Russia (GRID:grid.33762.33) (ISNI:0000000406204119)
42 University of Gent, Department of Subatomic and Radiation Physics, Gent, Belgium (GRID:grid.5342.0) (ISNI:0000000120697798); Carnegie Mellon University, Pittsburgh, U.S.A. (GRID:grid.147455.6) (ISNI:0000000120970344)
43 Peking University, School of Physics, Beijing, China (GRID:grid.11135.37) (ISNI:0000000122569319)
44 DESY, Zeuthen, Germany (GRID:grid.7683.a) (ISNI:0000000404920453); Universität Erlangen-Nürnberg, Physikalisches Institut, Erlangen, Germany (GRID:grid.5330.5) (ISNI:0000000121073311)
Publication year
2010
Publication date
Aug 2010
e-ISSN
10298479
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2398102128
Copyright
© The Author(s) 2010. Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. This work is published under https://creativecommons.org/licenses/by-nc/2.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.