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

We have measured the spin-dependent structure function $g_1^{\rm p}$ in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range $0.003 < x < 0.7$ and $1\gevtwo < Q^2 < 60\gevtwo$. A next-to-leading order QCD analysis is used to evolve the meas...

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Detalles Bibliográficos
Autores principales: Adams, D., Adeva, B., Arik, E., Arvidson, A., Badelek, B., Ballintijn, M.K., Bardin, G., Baum, Guenter, Berglund, P., Betev, L., Bird, I.G., Birsa, R., Bjorkholm, P., Bonner, B.E., de Botton, N., Boutemeur, M., Bradamante, F., Bravar, A., Bressan, A., Bueltmann, Stephen L., Burtin, E., Cavata, C., Crabb, D., Cranshaw, J., Cuhadar, T., Dalla Torre, S., van Dantzig, R., Derro, B., Deshpande, A., Dhawan, S., Dulya, C., Dyring, A., Eichblatt, S., Faivre, J.C., Fasching, D., Feinstein, F., Fernandez, C., Frois, B., Gallas, A., Garzon, J.A., Gaussiran, T., Giorgi, M., von Goeler, E., Gracia, G., de Groot, N., Grosse Perdekamp, M., Gulmez, Erhan, von Harrach, D., Hasegawa, T., Hautle, P., Hayashi, N., Heusch, C.A., Horikawa, N., Hughes, V.W., Igo, G., Ishimoto, S., Iwata, T., Kabuss, E.M., Karev, A., Kessler, H.J., Ketel, T.J., Kishi, A., Kiselev, Yu., Klostermann, L., Kramer, D., Krivokhijine, V., Kroger, W., Kurek, K., Kyynarainen, J., Lamanna, M., Landgraf, U., Layda, T., Le Goff, J.M., Lehar, F., de Lesquen, A., Lichtenstadt, J., Lindqvist, T., Litmaath, M., Lowe, M., Magnon, A., Mallot, G.K., Marie, F., Martin, A., Martino, J., Matsuda, T., Mayes, B., McCarthy, J.S., Medved, K., van Middelkoop, G., Miller, D., Mori, K., Moromisato, J., Nagaitsev, A., Nassalski, J., Naumann, L., Niinikoski, T.O., Oberski, J.E.J., Ogawa, A., Ozben, C., Parks, D.P., Penzo, A., Kunne, F., Peshekhonov, D., Piegaia, R., Pinsky, Lawrence S., Platchkov, S., Plo, M., Pose, D., Postma, H., Pretz, J., Pussieux, T., Pyrlik, J., Reyhancan, I., Rijllart, A., Roberts, J.B., Rock, S., Rodriguez, M., Rondio, E., Rosado, A., Sabo, I., Saborido, J., Sandacz, A., Savin, Igor A., Schiavon, P., Schuler, K.P., Segel, R., Seitz, R., Semertzidis, Y., Sever, F., Shanahan, P., Sichtermann, E.P., Simeoni, F., Smirnov, G.I., Staude, A., Steinmetz, A., Stiegler, U., Stuhrmann, H., Szleper, M., Teichert, K.M., 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, A.M., Zaremba, K., Zhao, J.
Lenguaje:eng
Publicado: 1997
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.56.5330
http://cds.cern.ch/record/321827
Descripción
Sumario:We have measured the spin-dependent structure function $g_1^{\rm p}$ in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range $0.003 < x < 0.7$ and $1\gevtwo < Q^2 < 60\gevtwo$. A next-to-leading order QCD analysis is used to evolve the measured $\gpone(x,Q^2)$ to a fixed $Q^2_0$. The first moment of $\gpone$ at $Q^2_0 = 10\gevtwo$ is $\gammap = 0.136\pm 0.013 \,(\mbox{stat.}) \pm 0.009\,(\mbox{syst.})\pm 0.005\ (\mbox{evol.})$. This result is below the prediction of the Ellis--Jaffe sum rule by more than two standard deviations. The singlet axial charge $\dsigt$ is found to be $0.28 \pm 0.16$. In the Adler--Bardeen factorization scheme, $\Delta g \simeq 2$ is required to bring $\Delta \Sigma$ in agreement with the Quark-Parton Model. A combined analysis of all available proton and deuteron data confirms the Bjorken sum rule.

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