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Adeva, B.; Arik, E.; Arvidson, A.; Badelek, B.; Bardin, G.; Baum, G.; Betev, L.; de Botton, N.; Bravar, A.; Bressan, A.; Burtin, E.; Cranshaw, J.; Çuhadar, T.; Dalla Torre, S.; van Dantzig, R.; Derro, B.; Deshpande, A.; Dhawan, S.; Dulya, C.; Fasching, D.; Feinstein, F.; Fernandez, C.; Forthmann, S.; Gallas, A.; Garzon, J.A.; Goertz, S.; Gracia, G.; de Groot, N.; Haft, K.; von Harrach, D.; Hasegawa, T.; Hayashi, N.; Heusch, C.A.; Hughes, V.W.; Igo, G.; Ishimoto, S.; Iwata, T.; Kabuß, E.M.; Kageya, T.; Kisselev, Yu; Krivokhijine, V.; Kröger, W.; Kuktin, V.; Kyynäräinen, J.; Lamanna, M.; Landgraf, U.; Le Goff, J.M.; Lichtenstadt, J.; Magnon, A.; Mallot, G.K.; Marie, F.; Martin, A.; Martino, J.; Matsuda, T.; Mayes, B.; McCarthy, J.S.; Medved, K.; Meyer, W.; van Middelkoop, G.; Miller, D.; Miyachi, Y.; Mori, K.; Moromisato, J.; Nassalski, J.; Naumann, L.; Oberski, J.E.J.; Ogawa, A.; Perdekamp, M.; Perrot-Kunne, F.; Peshekhonov, D.; Pinsky, L.; Plo, M.; Pose, D.; Postma, H.; Pretz, J.; Reicherz, G.; Rodriguez, M.; Rondio, E.; Roscherr, B.; Saborido, J.; Sandacz, A.; Savin, I.; Schiavon, P.; Sichtermann, E.P.; Simeoni, F.; Smirnov, G.I.; Steinmetz, A.; Stiegler, U.; Szleper, M.; Tessarotto, F.; Thers, D.; Tlaczala, W.; Tripet, A.; Unel, G.; Velasco, M.; Vogt, J.; Windmolders, R.; Witzmann, A.; Zanetti, A.M.; Zaremba, K.
Physics letters. B, 10/1997, Letnik: 412, Številka: 3Journal Article
We present a new measurement of the virtual photon proton asymmetry A 1 p from deep inelastic scattering of polarized muons on polarized protons in the kinematic range 0.0008 < x < 0.7 and 0.2 < Q 2 < 100 GeV 2. With this, the statistical uncertainty of our measurement has improved by a factor of 2 compared to our previous measurements. The spin-dependent structure function g 1 p is determined for the data with Q 2 > 1 GeV 2. A perturbative QCD evolution in next-to-leading order is used to determine g 1 p( x) at a constant Q 2. At Q 2 = 10 GeV 2 we find, in the measured range, ∫ 0.003 0.7 g 1 P(x) dx=0.139±0.006 ( stat) ±0.008 ( syst) ±0.006( evol) . The value of the first moment Г 1 P= ∫ 0 1 g 1 p(x) d x of g 1 p depends on the approach used to describe the behaviour of g 1 p at low x. We find that the Ellis-Jaffe sum rule is violated. With our published result for Γ 1 d we confirm the Bjorken sum rule with an accuracy of ≈ 15% at the one standard deviation level.
