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

Adams, D; Adeva, B; Arik, E; Arvidson, A; Badelek, B; Ballintijn, Mk; Bardin, G; Baum, G; Berglund, P; Betev, L; Bird, Ig; Birsa, Renato; Bjorkholm, P; Bonner, Be; Debotton, N; Boutemeur, M; Bradamante, Franco; Bravar, A; Bressan, Andrea; Bultmann, S; Burtin, E; Cavata, C; Crabb, D; Cranshaw, J; Cuhadar, T; Dalla Torre, Silvia; Vandantzig, R; Derro, B; Deshpande, A; Dhawan, S; Dulya, C; Dyring, A; Eichblatt, S; Faivre, Jc; Fasching, D; Feinstein, F; Fernandez, C; Frois, B; Gallas, A; Garzon, Ja; Gaussiran, T; Giorgi, Marcello; Vongoeler, E; Gracia, G; Degroot, N; Perdekamp, Mg; Gulmez, E; Vonharrach, D; Hasegawa, T; Hautle, P; Hayashi, N; Heusch, Ca; Horikawa, N; Hughes, Vw; Igo, G; Ishimoto, S; Iwata, T; Kabuss, Em; Karev, A; Kessler, Hj; Ketel, Tj; Kishi, A; Kisselev, Y; Klostermann, L; Kramer, D; Krivokhijine, V; Kroger, W; Kurek, K; Kyynarainen, J; Lamanna, M; Landgraf, U; Layda, T; Legoff, Jm; Lehar, F; Delesquen, A; Lichtenstadt, J; Lindqvist, T; Litmaath, M; Lowe, M; Magnon, A; Mallot, Gk; Marie, F; Martin, Anna; Martino, J; Matsuda, T; Mayes, B; Mccarthy, Js; Medved, K; Vanmiddelkoop, G; Miller, D; Mori, K; Moromisato, J; Nagaitsev, A; Nassalski, J; Naumann, L; Niinikoski, To; Jej, Oberski; Ogawa, A; Ozben, C; Parks, Dp; Penzo, A; Perrotkunne, F; Peshekhonov, D; Piegaia, R; Pinsky, L; Platchkov, S; Plo, M; Pose, D; Postma, H; Pretz, J; Pussieux, T; Pyrlik, J; Reyhancan, I; Rijllart, A; Roberts, Jb; Rock, S; Rodriguez, M; Rondio, E; Rosado, A; Sabo, I; Saborido, J; Sandacz, A; Savin, I; Schiavon, Paolo; Schuler, Kp; Segel, R; Seitz, R; Semertzidis, Y; Sever, F; Shanahan, P; Sichtermann, Ep; Simeoni, Fabrizio; Smirnov, Gi; Staude, A; Steinmetz, A; Stiegler, U; Stuhrmann, H; Szleper, M; Teichert, Km; Tessarotto, F; Tlaczala, W; Trentalange, S; Unel, G; Velasco, M; Vogt, J; Voss, R; Weinstein, R; Whitten, C; Windmolders, R; Willumeit, R; Wislicki, W; Witzmann, A; Zanetti, Anna Maria; Zaremba, K; Zhao, J.

doi:10.1103/PhysRevD.56.5330

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.

Spin structure of the proton from polarized inclusive deep-inelastic muon-proton scattering / Adams, D; Adeva, B; Arik, E; Arvidson, A; Badelek, B; Ballintijn, Mk; Bardin, G; Baum, G; Berglund, P; Betev, L; Bird, Ig; Birsa, Renato; Bjorkholm, P; Bonner, Be; Debotton, N; Boutemeur, M; Bradamante, Franco; Bravar, A; Bressan, Andrea; Bultmann, S; Burtin, E; Cavata, C; Crabb, D; Cranshaw, J; Cuhadar, T; DALLA TORRE, Silvia; Vandantzig, R; Derro, B; Deshpande, A; Dhawan, S; Dulya, C; Dyring, A; Eichblatt, S; Faivre, Jc; Fasching, D; Feinstein, F; Fernandez, C; Frois, B; Gallas, A; Garzon, Ja; Gaussiran, T; Giorgi, Marcello; Vongoeler, E; Gracia, G; Degroot, N; Perdekamp, Mg; Gulmez, E; Vonharrach, D; Hasegawa, T; Hautle, P; Hayashi, N; Heusch, Ca; Horikawa, N; Hughes, Vw; Igo, G; Ishimoto, S; Iwata, T; Kabuss, Em; Karev, A; Kessler, Hj; Ketel, Tj; Kishi, A; Kisselev, Y; Klostermann, L; Kramer, D; Krivokhijine, V; Kroger, W; Kurek, K; Kyynarainen, J; Lamanna, M; Landgraf, U; Layda, T; Legoff, Jm; Lehar, F; Delesquen, A; Lichtenstadt, J; Lindqvist, T; Litmaath, M; Lowe, M; Magnon, A; Mallot, Gk; Marie, F; Martin, Anna; Martino, J; Matsuda, T; Mayes, B; Mccarthy, Js; Medved, K; Vanmiddelkoop, G; Miller, D; Mori, K; Moromisato, J; Nagaitsev, A; Nassalski, J; Naumann, L; Niinikoski, To; Oberski, Jej; Ogawa, A; Ozben, C; Parks, Dp; Penzo, A; Perrotkunne, F; Peshekhonov, D; Piegaia, R; Pinsky, L; Platchkov, S; Plo, M; Pose, D; Postma, H; Pretz, J; Pussieux, T; Pyrlik, J; Reyhancan, I; Rijllart, A; Roberts, Jb; Rock, S; Rodriguez, M; Rondio, E; Rosado, A; Sabo, I; Saborido, J; Sandacz, A; Savin, I; Schiavon, Paolo; Schuler, Kp; Segel, R; Seitz, R; Semertzidis, Y; Sever, F; Shanahan, P; Sichtermann, Ep; Simeoni, Fabrizio; Smirnov, Gi; Staude, A; Steinmetz, A; Stiegler, U; Stuhrmann, H; Szleper, M; Teichert, Km; Tessarotto, F; Tlaczala, W; Trentalange, S; Unel, G; Velasco, M; Vogt, J; Voss, R; Weinstein, R; Whitten, C; Windmolders, R; Willumeit, R; Wislicki, W; Witzmann, A; Zanetti, ANNA MARIA; Zaremba, K; Zhao, J.. - In: PHYSICAL REVIEW D. - ISSN 0556-2821. - STAMPA. - 56:(1997), pp. 5330-5358. [10.1103/PhysRevD.56.5330]