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Measurement of the spin-dependent structure function g1(x) of the proton

1994; Elsevier BV; Volume: 329; Issue: 2-3 Linguagem: Inglês

10.1016/0370-2693(94)90793-5

1873-2445

D. L. Adams, B. Adeva, E. Arık, A. Arvidson, B. Badełek, M. Ballintijn, G. Bardin, G. Baum, P. Berglund, L. Betev, I. Bird, R. Birsa, P. Björkholm, B. E. Bonner, N. de Botton, F. Bradamante, A. Bressan, A. Brüll, S. Bültmann, E. Burtin, C. Cavata, M. Clocchiatti, M. Corcoran, Donald G. Crabb, J. Cranshaw, M. Crawford, T. Çuhadar, S. Dalla Torre, R. van Dantzig, S. Dhawan, C. Dulya, A. Dyring, S. Eichblatt, J.C. Faivre, D. Fasching, F. Feinstein, Christian Fernandéz, B. Frois, J. A. Garzón, T. Gaussiran, M. Giorgi, E. von Goeler, G. Gracia, N. De Groot, M. Große Perdekamp, E. Gülmez, D. von Harrach, T. Hasegawa, P. Hautle, N. Hayashi, C. A. Heusch, N. Horikawa, V. W. Hughes, G. Igo, S. Ishimoto, T. Iwata, E.M. Kabuβ, R. Kaiser, A. Karev, H.J. Kessler, T. Ketel, A. Kishi, Yu. Kisselev, L. Klostermann, D. Krämer, V. G. Krivokhijine, V. Kukhtin, J. Kyynäräinen, M. Lamanna, U. Landgraf, K. Lau, T. Layda, M.J. Le Goff, F. Lehar, A. de Lesquen, J. Lichtenstadt, T. Lindqvist, M. Litmaath, S. Lopez-Ponte, M. Löwe, A. Magnon, G.K. Mallot, F. Marie, A. Martin, J. Martino, T. Matsuda, B. Meyes, J. S. McCarthy, K. Medved, G. van Middelkoop, D. H. Miller, K. Mori, J. Moromisato, А. Нагайцев, J. Nassalski, L. Naumann, T. Niinikoski, J.E.J. Oberski, Drew Parks, A. Penzo, Carlos A. Pérez, F. Perrot-Kunne, D. Peshekhonov, R. Piegaia, L. Pinsky, S. Platchkov, M. Pló, D. Pose, H. Postma, J. Pretz, T. Pussieux, J. Pyrlik, İskender Atilla Reyhancan, J.M. Rieubland, A. Rijllart, J. B. Roberts, S. E. Rock, Miguel Á. Rodríguez, E. Rondio, A. Rosado, I. Sabo, J. Saborido, A. Sandacz, I. Savin, P. Schiavon, K. P. Schüler, R. E. Segel, R. Seitz, Yannis K. Semertzidis, F. Sever, P. Shanahan, N. Shumeiko, G.I. Smirnov, A. Staude, A. Steinmetz, U. Stiegler, H. B. Stuhrmann, K.M. Teichert, F. Tessarotto, Mayda Velasco, J. Vogt, R. Voss, R. Weinstein, C. Whitten, R. Windmolders, Regine Willumeit‐Römer, W. Wiślicki, A. Witzmann, Anna Zanetti, J. Zhao,

High-Energy Particle Collisions Research

We have measured the spin-dependent structure function $g_1^p$ of the proton in deep inelastic scattering of polarized muons off polarized protons, in the kinematic range $0.003<x<0.7$ and $1\,\mbox{GeV}^2<Q^2<60\,\mbox{GeV}^2$. Its first moment, $\int_0^1 g_1^p(x) dx $, is found to be $0.136 \pm 0.011\,(\mbox{stat.})\pm 0.011\,(\mbox{syst.})$ at $Q^2=10\,\mbox{GeV}^2$. This value is smaller than the prediction of the Ellis--Jaffe sum rule by two standard deviations, and is consistent with previous measurements. A combined analysis of all available proton, deuteron and neutron data confirms the Bjorken sum rule to within $10\%$ of the theoretical value.