Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

Airapetian, A.; Akopov, N.; Avakian, R.; Avetissian, A.; Elbakian, G.; Gharibyan, V.; Karyan, G.; Marukyan, H.; Movsisyan, A.; Petrosyan, A.; Taroian, S.; Akopov, Z.; Avetisyan, E.; Borissov, A.; Deconinck, W.; Hartig, M.; Holler, Y.; Rostomyan, A.; Schueler, K.P.; Ye, Z.; Zihlmann, B.; Aschenauer, E.C.; Gabbert, D.; Golembiovskaya, M.; Hillenbrand, A.; Hristova, I.; Negodaev, M.; Nowak, W.D.; Riedl, C.; Stewart, J.; Augustyniak, W.; Marianski, B.; Trzcinski, A.; Zupranski, P.; Belostotski, S.; Kisselev, A.; Manaenkov, S.I.; Naryshkin, Y.; Veretennikov, D.; Vikhrov, V.; Bianchi, N.; Capitani, G.P.; De Sanctis, E.; Di Nezza, P.; Fantoni, A.; Hadjidakis, C.; Hasch, D.; Muccifora, V.; Reolon, A.R.; Blok, H.P.; Bowles, J.; Burns, J.; Hoek, M.; Kaiser, R.; Lehmann, I.; Mahon, D.; Murray, M.; Rosner, G.; Seitz, B.; Bryzgalov, V.; Gapienko, G.; Gapienko, V.; Ivanilov, A.; Korotkov, V.; Salomatin, Y.; Capiluppi, M.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.F.; Lenisa, P.; Pappalardo, L.L.; Stancari, M.; Statera, M.; Cisbani, E.; Frullani, S.; Garibaldi, F.; Manfre, L.; De Leo, R.; Lagamba, L.; Nappi, E.; Vilardi, I.; Nardo, L. de; Diefenthaler, M.; Dueren, M.; Ehrenfried, M.; Perez-Benito, R.; Ellinghaus, F.; Kinney, E.; Felawka, L.; Miller, C.A.; Yen, S.; Gavrilov, G.; Giordano, F.; Gliske, S.; Lorenzon, W.; Imazu, Y.; Miyachi, Y.; Shibata, T.A.; Jackson, H.E.; Reimer, P.E.; Jo, H.S.; Lopez Ruiz, A.; Ryckbosch, D.; Tytgat, M.; Vandenbroucke, A.; Haarlem, Y. van; Hulse, C. van; Joosten, S.; Makins, N.C.R.; Truty, R.; Keri, T.; Kozlov, V.; Terkulov, A.; Kravchenko, P.; Krivokhijine, V.G.; Shutov, V.; Lapikas, L.; Steijger, J.J.M.; Ma, B.Q.; Mao, Y.; Wang, S.; Martinez de la Ossa, A.; Mussgiller, A.; Nass, A.; Rith, K.; Steffens, E.; Stinzing, F.; Zeiler, D.; Rubin, J.; Sanftl, F.; Schaefer, A.; Schnell, G.; Yaschenko, S.; Zagrebelnyy, V.; HERMES Collaboration

doi:10.1140/epjc/s10052-012-1921-5

Published March 2012 | Version v1

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Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

1. University of Michigan, Randall Laboratory of Physics, Ann Arbor, MI (United States)
2. Universitaet Giessen, Physikalisches Institut, Giessen (Germany)
3. Yerevan Physics Institute, Yerevan (Armenia)
4. DESY, Hamburg (Germany)
5. DESY, Zeuthen (Germany)
6. National Centre for Nuclear Research, Warsaw (Poland)
7. Petersburg Nuclear Physics Institute, Gatchina, Leningrad Region (Russian Federation)
8. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Frascati (Italy)
9. VU University, Department of Physics and Astronomy, Amsterdam (Netherlands)
10. National Institute for Subatomic Physics (Nikhef), Amsterdam (Netherlands)
11. University of Glasgow, SUPA, School of Physics and Astronomy, Glasgow (United Kingdom)
12. Institute for High Energy Physics, Protvino, Moscow Region (Russian Federation)
13. Universita di Ferrara, Dipartimento di Fisica, Ferrara (Italy)
14. Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Ferrara (Italy)
15. Istituto Superiore di Sanita, Roma (Italy)
16. Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Gruppo Collegato Sanita (Italy)
17. Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Bari (Italy)
18. Ghent University, Department of Physics and Astronomy, Gent (Belgium)
19. University of Illinois, Department of Physics, Urbana, IL (United States)
20. Universitaet Erlangen-Nuernberg, Physikalisches Institut, Erlangen (Germany)
21. University of Colorado, Nuclear Physics Laboratory, Boulder, CO (United States)
22. TRIUMF, Vancouver, British Columbia (Canada)
23. Tokyo Institute of Technology, Department of Physics, Tokyo (Japan)
24. Argonne National Laboratory, Physics Division, Argonne, IL (United States)
25. Lebedev Physical Institute, Moscow (Russian Federation)
26. Joint Institute for Nuclear Research, Dubna (Russian Federation)
27. Peking University, School of Physics, Beijing (China)
28. Universitaet Erlangen-Nuernberg, Physikalisches Institut, Erlangen (DE)
29. DESY, Hamburg (DE)
30. University of Illinois, Department of Physics, Urbana, IL (US)
31. Argonne National Laboratory, Physics Division, Argonne, IL (US)
32. Tokyo Institute of Technology, Department of Physics, Tokyo (JP)
33. Universitaet Regensburg, Institut fuer Theoretische Physik, Regensburg (DE)
34. Ghent University, Department of Physics and Astronomy, Gent (BE)
35. DESY, Zeuthen (DE)
36. Universitaet Giessen, Physikalisches Institut, Giessen (DE)

A measurement of the virtual-photon asymmetry A2(x,Q 2) and of the spin-structure function g2(x,Q 2) of the proton are presented for the kinematic range 0.004<x<0.9 and 0.18 GeV2<Q 2<20 GeV2. The data were collected by the HERMES experiment at the HERA storage ring at DESY while studying inclusive deep-inelastic scattering of 27.6 GeV longitudinally polarized leptons off a transversely polarized hydrogen gas target. The results are consistent with previous experimental data from CERN and SLAC. For the x-range covered, the measured integral of g2(x) converges to the null result of the Burkhardt-Cottingham sum rule. The x 2 moment of the twist-3 contribution to g2(x) is found to be compatible with zero. (orig.)

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Available from: http://dx.doi.org/10.1140/epjc/s10052-012-1921-5

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DOI: 10.1140/epjc/s10052-012-1921-5;

Journal Title: European Physical Journal. C
Journal Volume: 72
Journal Issue: 3
Journal Page Range: p. 1-7
ISSN: 1434-6044

Country of Publication: Germany
Country of Input or Organization: Germany
INIS RN: 43051290
Subject category: S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator: Numerical Data
Descriptors DEI: ANTILEPTON-PROTON INTERACTIONS; DEEP INELASTIC SCATTERING; ELECTRON-PROTON INTERACTIONS; ELECTRONS; EXPERIMENTAL DATA; GEV RANGE 10-100; PHOTON-PROTON INTERACTIONS; POLARIZATION-ASYMMETRY RATIO; POLARIZED BEAMS; POLARIZED TARGETS; POSITRONS; PROTONS; SPIN ORIENTATION; STRUCTURE FUNCTIONS
Descriptors DEC: ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BARYONS; BASIC INTERACTIONS; BEAMS; DATA; DIMENSIONLESS NUMBERS; ELECTROMAGNETIC INTERACTIONS; ELECTRON-NUCLEON INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FUNCTIONS; GEV RANGE; HADRONS; INELASTIC SCATTERING; INFORMATION; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; LEPTON-PROTON INTERACTIONS; LEPTONS; MATTER; NUCLEONS; NUMERICAL DATA; ORIENTATION; PARTICLE INTERACTIONS; PHOTON-BARYON INTERACTIONS; PHOTON-HADRON INTERACTIONS; PHOTON-NUCLEON INTERACTIONS; SCATTERING; TARGETS

Collaborations: HERMES Collaboration

Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

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Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

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