Spin asymmetries A_{1} and structure functions g_{1} of the proton and the deuteron from polarized high energy muon scattering

Adeva, B.; Akdogan, T.; Arik, E.; Arvidson, A.; Badelek, B.; Bardin, G.; Baum, G.; Berglund, P.; Betev, L.; Bird, I. G.; Birsa, Renato; Björkholm, P.; de Botton, N.; Boutemeur, M.; Bradamante, Franco; Bravar, A.; Bressan, Andrea; Bültmann, S.; Burtin, E.; Cavata, C.; Crabb, D.; Cranshaw, J.; Çuhadar, T.; DALLA TORRE, Silvia; van Dantzig, R.; Derro, B.; Deshpande, A.; Dhawan, S.; Dulya, C.; Dyring, A.; Eichblatt, S.; Faivre, J. C.; Fasching, D.; Feinstein, F.; Fernandez, C.; Forthmann, S.; Frois, B.; Gallas, A.; Garzon, J. A.; Gilly, H.; Giorgi, Marcello; von Goeler, E.; Goertz, S.; Golutvin, I. A.; Gracia, G.; de Groot, N.; Grosse Perdekamp, M.; Haft, K.; 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.; Kessler, H. J.; Ketel, T. J.; Kiryluk, J.; Kiryushin, I.; Kishi, A.; Kisselev, Y. u.; Klostermann, L.; Krämer, D.; Krivokhijine, V.; Kröger, W.; Kukhtin, V.; Kurek, K.; Kyynäräinen, J.; Lamanna, M.; Landgraf, U.; 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, Anna; Martino, J.; Matsuda, T.; Mayes, B.; Mccarthy, J. S.; Medved, K.; Meyer, W.; van Middelkoop, G.; Miller, D.; Miyachi, Y.; Mori, K.; Moromisato, J.; Nagaitsev, A.; Nassalski, J.; Naumann, L.; Niinikoski, T. O.; Oberski, J. E. J.; Ogawa, A.; Ozben, C.; Pereira, H.; Perrot Kunne, F.; Peshekhonov, D.; Piegia, R.; Pinsky, L.; Platchkov, S.; Plo, M.; Pose, D.; Postma, H.; Pretz, J.; Puntaferro, R.; Pussieux, T.; Rädel, G.; Rijllart, A.; Reicherz, G.; Roberts, J.; Rock, S.; Rodriguez, M.; Rondio, E.; Ropelewski, L.; Sabo, I.; Saborido, J.; Sandacz, A.; Savin, I.; Schiavon, Paolo; Schiller, A.; Schüler, K. P.; Seitz, R.; Semertzidis, Y.; Sergeev, S.; Shanahan, P.; Sichtermann, E. P.; Simeoni, Fabrizio; Smirnov, G. I.; Staude, A.; Steinmetz, A.; Stiegler, U.; Stuhrmann, H.; Szleper, M.; Tessarotto, F.; Thers, D.; Tlaczala, W.; Tripet, A.; Unel, G.; Velasco, M.; Vogt, J.; Voss, R.; Whitten, C.; Windmolders, R.; Willumeit, R.; Wislicki, W.; Witzmann, A.; Ylöstalo, J.; Zanetti, ANNA MARIA; Zaremba, K.; Zamiatin, N. I.; Zhao, J.

doi:10.1103/PhysRevD.58.112001

We present the final results of the spin asymmetries A1 and the spin structure functions g1 of the proton and the deuteron in the kinematic range 0.0008<x<0.7 and 0.2<Q2<100GeV2. For the determination of A1, in addition to the usual method which employs inclusive scattering events and includes a large radiative background at low x, we use a new method which minimizes the radiative background by selecting events with at least one hadron as well as a muon in the final state. We find that this hadron method gives smaller errors for x<0.02, so it is combined with the usual method to provide the optimal set of results.