Measurement of the neutron spin structure function gn1 with a polarized 3He internal target

K. Ackerstaff, A. Airapetian, I. Akushevich, N. Akopov, M. Amarian, E. C. Aschenauer, R. Avakian, H. Avakian, A. Avetissian, B. Bains, S. Barrow, M. Beckmann, S. Belostotski, J. E. Belz, T. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. BöttcherA. Borissov, J. Brack, B. Braun, B. Bray, W. Brückner, A. Briill, E. E.W. Bruins, H. J. Bulten, G. P. Capitani, P. Carter, E. Cisbani, G. R. Court, P. P.J. Delheij, E. Devitsin, C. W. de Jager, E. de Sanctis, D. de Schepper, P. K.A. de Witt Huberts, M. Düren, A. Dvoredsky, G. Elbakian, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B. W. Filippone, H. Fischer, H. T. Fortune, J. Franz, S. Frullani, M. A. Funk, N. D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, P. Geiger, V. Gharibyan, A. Golendoukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, A. Gute, V. Gyurjyan, J. P. Haas, W. Haeberli, J. O. Hansen, D. Hasch, O. Häusser, R. S. Henderson, T. Henkes, R. Hertenberger, Y. Holler, R. J. Holt, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, W. Korsch, V. Kozlov, L. H. Kramer, B. Krause, V. G. Krivokhijine, M. Kückes, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N. C.R. Makins, S. I. Manaenkov, F. K. Martens, J. W. Martin, A. Mateos, K. Mcllhany, R. D. McKeown, F. Meissner, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W. D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T. G. O'Neill, R. Openshaw, V. Papavassiliou, S. F. Pate, M. Pitt, S. Potashov, D. H. Potterveld, B. Povh, G. Rakness, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, G. Röper, H. Roloff, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, K. P. Schüler, A. Schwind, T. A. Shibata, T. Shin, A. Simon, K. Sinram, W. R. Smythe, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D. M. Thiessen, B. Tipton, A. Trudel, M. Tytgat, G. M. Urciuoli, R. van de Vyver, J. FJ van den Brand, G. van der Steenhoven, M. C. Vetterli, E. Volk, W. Wander, T. P. Welch, S. E. Williamson, T. Wise, T. Wölfel, K. Zapfe-Düren, H. Zohrabian, R. Zurmühle

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Abstract

Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function gn1(x, Q2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3He internal gas target. The data cover the kinematic range 0.023 < x < 0.6 and 1 (GeV/c)2 < Q2 < 15 (GeV/c)2. The integral ∫0.60.023 gn1(x) dx evaluated at a fixed Q2 of 2.5 (GeV/c)2 is -0.034 ± 0.013(stat.) ±0.005(syst.). Assuming Regge behavior at low x, the first moment Γn1 = ∫10 gn1(x) dx is -0.037 ± 0.013(stat.) ±0.005(syst.) ±0.006(extrapol.).

Original languageEnglish
Pages (from-to)383-389
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume404
Issue number3-4
DOIs
StatePublished - Jul 10 1997

Bibliographical note

Funding Information:
We gratefully acknowledge the DESY management for its support and the DESY staff and the staffs of the collaborating institutions for their significant effort. This work was supported by the US Department of Energy and National Science Foundation; the Natural Sciences and Engineering Research Council of Canada; the German Bundesministerium ftir Bil-dung, Wissenschaft Forschung und Technologie, the German Academic Exchange Sevice (DAAD); the Italian Istituto Nazionale di Fisica Nucleare; Mon-busho International Scientific Research Program, JSPJ, and Toray Science Foundation of Japan; the Dutch Foundation for Fundamental Research of Matter; the NFWO/IIKW, Belgium; the UK Particle Physics and Astronomy Research Council and the INTAS contribution from the European Community.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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