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Spin structure of the proton from polarized inclusive deep-inelastic muon-proton scattering

1997; American Physical Society; Volume: 56; Issue: 9 Linguagem: Inglês

10.1103/physrevd.56.5330

1538-4500

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, M. Boutemeur, F. Bradamante, A. Bravar, A. Bressan, S. Bültmann, E. Burtin, C. Cavata, D. Crabb, J. Cranshaw, T. Çuhadar, S. Dalla Torre, R. van Dantzig, B. Derro, A. Deshpande, S. Dhawan, C. Dulya, A. Dyring, S. Eichblatt, J.C. Faivre, D. Fasching, F. Feinstein, Christian Fernandéz, B. Frois, A. Gallas, 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. Kabuß, A. Karev, H.J. Kessler, T. Ketel, A. Kishi, Yu. Kisselev, L. Klostermann, D. Krämer, V. G. Krivokhijine, W. Kröger, K. Kurek, J. Kyynäräinen, M. Lamanna, U. Landgraf, T. Layda, J.M. Le Goff, F. Lehar, A. de Lesquen, J. Lichtenstadt, T. Lindqvist, M. Litmaath, M. Löwe, A. Magnon, G.K. Mallot, F. Marie, A. Martin, J. Martino, T. Matsuda, B. Mayes, J. S. McCarthy, K. Medved, G. van Middelkoop, D.B. Miller, K. Mori, J. Moromisato, А. Нагайцев, J. Nassalski, L. Naumann, T. Niinikoski, J.E.J. Oberski, A. Ogawa, C. Özben, Drew Parks, A. Penzo, F. Perrot-Kunne, D. Peshekhonov, R. Piegaia, L. Pinsky, S. Platchkov, M. Plo, D. Pose, H. Postma, J. Pretz, T. Pussieux, J. Pyrlik, İskender Atilla Reyhancan, 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, E. P. Sichtermann, Francesca Simeoni, G. I. Smirnov, A. Staude, A. Steinmetz, U. Stiegler, H. B. Stuhrmann, M. Szleper, K.M. Teichert, F. Tessarotto, W. Tłaczała, S. Trentalange, G. Ünel, Mayda Velasco, J. Vogt, R. Voss, R. Weinstein, C. Whitten, R. Windmolders, Regine Willumeit‐Römer, W. Wiślicki, A. Witzmann, A. Zanetti, К. Заремба, J. Zhao,

Dark Matter and Cosmic Phenomena

We have measured the spin-dependent structure function g1p in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range 0.003<x<0.7 and 1GeV2<Q2<60GeV2. A next-to-leading order QCD analysis is used to evolve the measured g1p(x,Q2) to a fixed Q02. The first moment of g1p at Q02=10GeV2 is Γ1p=0.136±0.013 (stat) ±0.009 (syst) ±0.005 (evol). This result is below the prediction of the Ellis-Jaffe sum rule by more than two standard deviations. The singlet axial charge a0 is found to be 0.28±0.16. In the Adler-Bardeen factorization scheme, Δg≃2 is required to bring ΔΣ in agreement with the quark-parton model. A combined analysis of all available proton, deuteron, and 3He data confirms the Bjorken sum rule.Received 11 February 1997DOI:https://doi.org/10.1103/PhysRevD.56.5330©1997 American Physical Society