Measurement of the virtual-photon asymmetry A 2 and the spin-structure function g 2 of the proton
- Airapetian, A.
- Akopov, N.
- Akopov, Z.
- Aschenauer, E. C.
- Augustyniak, W.
- Avakian, R.
- Avetissian, A.
- Avetisyan, E.
- Belostotski, S.
- Bianchi, N.
- Blok, H. P.
- Borissov, A.
- Bowles, J.
- Bryzgalov, V.
- Burns, J.
- Capiluppi, M.
- Capitani, G. P.
- Cisbani, E.
- Ciullo, G.
- Contalbrigo, M.
- Dalpiaz, P. F.
- Deconinck, W.
- Leo, R.
- Nardo, L.
- Sanctis, E.
- Diefenthaler, M.
- Nezza, P.
- Düren, M.
- Ehrenfried, M.
- Elbakian, G.
- Ellinghaus, F.
- Fantoni, A.
- Felawka, L.
- Frullani, S.
- Gabbert, D.
- Gapienko, G.
- Gapienko, V.
- Garibaldi, F.
- Gavrilov, G.
- Gharibyan, V.
- Giordano, F.
- Gliske, S.
- Golembiovskaya, M.
- Hadjidakis, C.
- Hartig, M.
- Hasch, D.
- Hillenbrand, A.
- Hoek, M.
- Holler, Y.
- Hristova, I.
- Imazu, Y.
- Ivanilov, A.
- Jackson, H. E.
- Jo, H. S.
- Joosten, S.
- Kaiser, R.
- Karyan, G.
- Keri, T.
- Kinney, E.
- Kisselev, A.
- Korotkov, V.
- Kozlov, V.
- Kravchenko, P.
- Krivokhijine, V. G.
- Lagamba, L.
- Lapikás, L.
- Lehmann, I.
- Lenisa, P.
- López Ruiz, A.
- Lorenzon, W.
- Ma, B.-Q.
- Mahon, D.
- Makins, N. C. R.
- Manaenkov, S. I.
- Manfré, L.
- Mao, Y.
- Marianski, B.
- Martinez de la Ossa, A.
- Marukyan, H.
- Miller, C. A.
- Miyachi, Y.
- Movsisyan, A.
- Muccifora, V.
- Murray, M.
- Mussgiller, A.
- Nappi, E.
- Naryshkin, Y.
- Nass, A.
- Negodaev, M.
- Nowak, W.-D.
- Pappalardo, L. L.
- Perez-Benito, R.
- Petrosyan, A.
- Reimer, P. E.
- Reolon, A. R.
- Riedl, C.
- Rith, K.
- Rosner, G.
- Rostomyan, A.
- Rubin, J.
- Ryckbosch, D.
- Salomatin, Y.
- Sanftl, F.
- Schäfer, A.
- Schnell, G.
- Schüler, K. P.
- Seitz, B.
- Shibata, T.-A.
- Shutov, V.
- Stancari, M.
- Statera, M.
- Steffens, E.
- Steijger, J. J. M.
- Stewart, J.
- Stinzing, F.
- Taroian, S.
- Terkulov, A.
- Truty, R.
- Trzcinski, A.
- Tytgat, M.
- Vandenbroucke, A.
- Haarlem, Y.
- Hulse, C.
- Veretennikov, D.
- Vikhrov, V.
- Vilardi, I.
- Wang, S.
- Yaschenko, S.
- Ye, Z.
- Yen, S.
- Zagrebelnyy, V.
- Zeiler, D.
- Zihlmann, B.
- Zupranski, P.
Publication date
March 2012
DOI Publisher
Springer Science and Business Media LLC Language
EnglishAbstract
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
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