Polarisation of valence and non-strange sea quarks in the nucleon from semi-inclusive spin asymmetries

We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and deuterons in the range 0.003<x<0.7. From these asymmetries and the previously published inclusive spin asymmetrie...

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Detalles Bibliográficos
Autores principales: Adeva, B, Arik, E, Arvidson, A, Badelek, B, Ballintijn, M K, Bardin, G, Baum, G, Berglund, P, Betev, L, Bird, I G, Birsa, R, Björkholm, P, Bonner, B E, De Botton, N R, Bradamante, Franco, Bressan, A, Bültmann, S, Burtin, E, Cavata, C, Crabb, D, Cranshaw, J, Çuhadar-Dönszelmann, T, Dalla Torre, S, Van Dantzig, R, Deshpande, A A, Dhawan, S K, Dulya, C M, Dyring, A, Eichblatt, S, Faivre, Jean-Claude, Fasching, D, Feinstein, F, Fernández, C, Frois, Bernard, Garzón, J A, Gaussiran, T, Giorgi, M A, von Goeler, E, Gómez, A, Gracia, G, De Groot, N, Grosse-Perdekamp, M, Gülmez, E, 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, Kageya, T, Karev, A G, Ketel, T, Kessler, H J, Kishi, A, Kiselev, Yu F, Klostermann, L, Krämer, Dietrich, Krivokhizhin, V G, Kröger, W, Kyynäräinen, J, Lamanna, M, Layda, T, Landgraf, U, Le Goff, J M, Lehár, F, de Lesquen, A, Lichtenstadt, J, Litmaath, M, López-Ponte, S, Loewe, M, Magnon, A, Mallot, G K, Marie, F, Martin, A, Martino, J, Matsuda, T, Mayes, B W, McCarthy, J S, Medved, K S, Van Middelkoop, G, Miller, D, Mori, K, Moromisato, J H, Nagaitsev, A P, Nassalski, J P, Naumann, Lutz, Niinikoski, T O, Oberski, J, Ogawa, A, Ozben, C, Penzo, Aldo L, Pérez, C, Perrot-Kunne, F, Peshekhonov, V D, Piegaia, R, Pinsky, L, Platchkov, S K, Pló, M, Pose, D, Postma, H, Pretz, J, Pussieux, T, Pyrlik, J, Reyhancan, I, Rijllart, A, Roberts, J B, Rock, S E, Rodríguez, M, Rondio, Ewa, Rosado, A, Dabo, I, Saborido, J, Sandacz, A, Savin, I A, Schiavon, R P, Schüler, K P, Segel, R E, Seitz, R, Semertzidis, Y K, Sergeev, S, Sever, F, Shanahan, P, Sichtermann, E P, Smirnov, G I, Staude, A, Steinmetz, A, Stiegler, U, Stuhrmann, H B, Szleper, M, Teichert, K M, Tessarotto, F, Velasco, M, Vogt, J, Voss, Rüdiger, Weinstein, R, Whitten, C, Windmolders, R, Willumeit, R, Wislicki, W, Witzmann, A, Zanetti, A M, Zhao, J
Lenguaje:eng
Publicado: 1995
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(95)01584-1
http://cds.cern.ch/record/294832
Descripción
Sumario:We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and deuterons in the range 0.003<x<0.7. From these asymmetries and the previously published inclusive spin asymmetries we determine, for the first time, the x-dependent spin distributions for {\it up} and {\it down} valence quarks and for {\it non-strange} sea quarks. We find that the first moments of the valence quark spin distributions are \Delta u_v = 1.01 \pm 0.19 \pm 0.14 and \Delta d_v = -0.57 \pm 0.22 \pm 0.11. The spin distribution function of {\it non-strange} sea quarks is consistent with zero over the measured range of x and the first moment is \Delta \bar u = \Delta \bar d = -0.02 \pm 0.09 \pm 0.03.

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