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

Author
Organization
Project
HERMES
Abstract
A measurement of the virtual-photon asymmetry A(2)(x, Q(2)) and of the spin-structure function g(2)(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 g(2)(x) converges to the null result of the Burkhardt-Cottingham sum rule. The x(2) moment of the twist-3 contribution to g(2)(x) is found to be compatible with zero.
Keywords
DEEP-INELASTIC-SCATTERING, ELECTRON STORAGE-RING, SUM-RULES, HERA, POLARIZATION, POLARIMETER, TARGET

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Citation

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Chicago
Airapetian, A, N Akopov, Z Akopov, EC Aschenauer, W Augustyniak, R Avakian, A Avetissian, et al. 2012. “Measurement of the Virtual-photon Asymmetry A₂ and the Spin-structure Function G₂ of the Proton.” European Physical Journal C 72 (3).
APA
Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E., Augustyniak, W., Avakian, R., Avetissian, A., et al. (2012). Measurement of the virtual-photon asymmetry A₂ and the spin-structure function g₂ of the proton. EUROPEAN PHYSICAL JOURNAL C, 72(3).
Vancouver
1.
Airapetian A, Akopov N, Akopov Z, Aschenauer E, Augustyniak W, Avakian R, et al. Measurement of the virtual-photon asymmetry A₂ and the spin-structure function g₂ of the proton. EUROPEAN PHYSICAL JOURNAL C. 2012;72(3).
MLA
Airapetian, A, N Akopov, Z Akopov, et al. “Measurement of the Virtual-photon Asymmetry A₂ and the Spin-structure Function G₂ of the Proton.” EUROPEAN PHYSICAL JOURNAL C 72.3 (2012): n. pag. Print.
@article{2142063,
  abstract     = {A measurement of the virtual-photon asymmetry A(2)(x, Q(2)) and of the spin-structure function g(2)(x, Q(2)) of the proton are presented for the kinematic range 0.004 {\textlangle} x {\textlangle} 0.9 and 0.18 GeV2 {\textlangle} Q(2) {\textlangle} 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 g(2)(x) converges to the null result of the Burkhardt-Cottingham sum rule. The x(2) moment of the twist-3 contribution to g(2)(x) is found to be compatible with zero.},
  articleno    = {1921},
  author       = {Airapetian, A and Akopov, N and Akopov, Z and Aschenauer, EC and Augustyniak, W and Avakian, R and Avetissian, A and Avetisyan, E and Belostotski, S and Bianchi, N and Blok, HP and Borissov, A and Bowles, J and Bryzgalov, V and Burns, J and Capiluppi, M and Capitani, GP and Cisbani, E and Ciullo, G and Contalbrigo, M and Dalpiaz, PF and Deconinck, W and De Leo, R and De Nardo, Lara and De Sanctis, E and Diefenthaler, M and Di Nezza, P and Duren, M and Ehrenfried, M and Elbakian, G and Ellinghaus, F and Fantoni, A and Felawka, L and Frullani, S and Gabbert, Dominik and Gapienko, G and Gapienko, V and Garibaldi, F and Gavrilov, G and Gharibyan, V and Giordano, F and Gliske, S and Golembiovskaya, M and Hadjidakis, C and Hartig, M and Hasch, D and Hillenbrand, A and Hoek, M and Holler, Y and Hristova, I and Imazu, Y and Ivanilov, A and Jackson, HE and Jo, HS and Joosten, S and Kaiser, R and Karyan, G and Keri, T and Kinney, E and Kisselev, A and Korotkov, V and Kozlov, V and Kravchenko, P and Krivokhijine, VG and Lagamba, L and Lapikas, L and Lehmann, I and Lenisa, P and Lopez Ruiz, Alejandro and Lorenzon, W and Ma, BQ and Mahon, D and Makins, NCR and Manaenkov, SI and Manfre, L and Mao, Y and Marianski, B and de la Ossa, AM and Marukyan, H and Miller, CA and Miyachi, Y and Movsisyan, A and Muccifora, V and Murray, M and Mussgiller, A and Nappi, E and Naryshkin, Y and Nass, A and Negodaev, M and Nowak, WD and Pappalardo, LL and Perez-Benito, R and Petrosyan, A and Reimer, PE and Reolon, AR and Riedl, C and Rith, K and Rosner, G and Rostomyan, A and Rubin, J and Ryckbosch, Dirk and Salomatin, Y and Sanftl, F and Schafer, A and Schnell, G and Schuler, KP and Seitz, B and Shibata, TA and Shutov, V and Stancari, M and Statera, M and Steffens, E and Steijger, JJM and Stewart, J and Stinzing, F and Taroian, S and Terkulov, A and Truty, R and Trzcinski, A and Tytgat, Michael and Vandenbroucke, A and Van Haarlem, Y and Van Hulse, Charlotte and Veretennikov, D and Vikhrov, V and Vilardi, I and Wang, S and Yaschenko, S and Ye, Z and Yen, S and Zagrebelnyy, V and Zeiler, D and Zihlmann, B and Zupranski, P},
  issn         = {1434-6044},
  journal      = {EUROPEAN PHYSICAL JOURNAL C},
  language     = {eng},
  number       = {3},
  pages        = {7},
  title        = {Measurement of the virtual-photon asymmetry A\unmatched{2082} and the spin-structure function g\unmatched{2082} of the proton},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-012-1921-5},
  volume       = {72},
  year         = {2012},
}

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