/ Experiment-HEP arXiv:1001.4654


The Spin-dependent Structure Function of the Proton g_1^p and a Test of the Bjorken Sum Rule


Alekseev, M G (INFN, Turin) ; Alekseev, M.G. (INFN, Turin) ; Alexakhin, V Yu (Dubna, JINR) ; Alexandrov, Yu (Lebedev Inst.) ; Alexeev, G D (Dubna, JINR) ; Amoroso, A (Turin U.) ; Austregesilo, A (CERN) ; Badelek, B (Warsaw, Inst. Nucl. Studies) ; Balestra, F (Turin U.) ; Ball, J (SPhN, DAPNIA, Saclay) ; Barth, J (Bonn U.) ; Baum, G (Bielefeld U.) ; Bedfer, Y (SPhN, DAPNIA, Saclay) ; Bernhard, J (Mainz U.) ; Bertini, R (Turin U.) ; Bettinelli, M (Munich U.) ; Birsa, R (INFN, Trieste) ; Bisplinghoff, J (Bonn U., HISKP) ; Bordalo, P (Lisbon, LIFEP) ; Bradamante, F (Trieste U.) ; Bravar, A (INFN, Trieste) ; Bressan, A (Trieste U.) ; Brona, G (CERN) ; Burtin, E (SPhN, DAPNIA, Saclay) ; Bussa, M P (Turin U.) ; Chaberny, D (Mainz U.) ; Cotic, D (Mainz U.) ; Chiosso, M (Turin U.) ; Chung, S U (Munich, Tech. U.) ; Cicuttin, A (INFN, Trieste) ; Colantoni, M (INFN, Turin) ; Crespo, M L (INFN, Trieste) ; Dalla Torre, S (INFN, Trieste) ; Das, S (Matrivani Inst., Calcutta) ; Dasgupta, S S (Matrivani Inst., Calcutta) ; Denisov, O Yu (CERN) ; Dhara, L (Matrivani Inst., Calcutta) ; Diaz, V (INFN, Trieste) ; Donskov, S V (Serpukhov, IHEP) ; Doshita, N (Bochum U.) ; Duic, V (Trieste U.) ; Dnnweber, W (Munich U.) ; Efremov, A (Dubna, JINR) ; El Alaoui, A (SPhN, DAPNIA, Saclay) ; Eversheim, P D (Bonn U., HISKP) ; Eyrich, W (Erlangen - Nuremberg U.) ; Faessler, M (Munich U.) ; Ferrero, A (Turin U.) ; Filin, A (Serpukhov, IHEP) ; Finger, M (Charles U.) ; Finger, M Jr (Dubna, JINR) ; Fischer, H (Freiburg U.) ; Franco, C (Lisbon, LIFEP) ; Friedrich, J M (Munich, Tech. U.) ; Garfagnini, R (Turin U.) ; Gautheron, F (Bielefeld U.) ; Gavrichtchouk, O P (Dubna, JINR) ; Gazda, R (Warsaw, Inst. Nucl. Studies) ; Gerassimov, S (Lebedev Inst.) ; Geyer, R (Munich U.) ; Giorgi, M (Trieste U.) ; Gnesi, I (Turin U.) ; Gobbo, B (INFN, Trieste) ; Goertz, S (Bochum U.) ; Grabmller, S (Munich, Tech. U.) ; Grasso, A (Turin U.) ; Grube, B (Munich, Tech. U.) ; Gushterski, R (Dubna, JINR) ; Guskov, A (Dubna, JINR) ; Haas, F (Munich, Tech. U.) ; von Harrach, D (Mainz U.) ; Hasegawa, T (Miyazaki U.) ; Heinsius, F H (Freiburg U.) ; Hermann, R (Mainz U.) ; Herrmann, F (Freiburg U.) ; He, C (Bochum U.) ; Hinterberger, F (Bonn U., HISKP) ; Horikawa, N (Nagoya U.) ; Hppner, Ch (Munich, Tech. U.) ; d'Hose, N (SPhN, DAPNIA, Saclay) ; Ilgner, C (CERN) ; Ishimoto, S (Nagoya U.) ; Ivanov, O (Dubna, JINR) ; Ivanshin, Yu (Dubna, JINR) ; Iwata, T (Yamagata U.) ; Jahn, R (Bonn U., HISKP) ; Jasinski, P (Mainz U.) ; Jegou, G (SPhN, DAPNIA, Saclay) ; Joosten, R (Bonn U., HISKP) ; Kabu, E (Mainz U.) ; Kfer, W (Freiburg U.) ; Kang, D (Freiburg U.) ; Ketzer, B (Munich, Tech. U.) ; Khaustov, G V (Serpukhov, IHEP) ; Khokhlov, Yu A (Serpukhov, IHEP) ; Kisselev, Yu (Bielefeld U.) ; Klein, F (Bonn U.) ; Klimaszewski, K (Warsaw, Inst. Nucl. Studies) ; Koblitz, S (Mainz U.) ; Koivuniemi, J H (Bochum U.) ; Kolosov, V N (Serpukhov, IHEP) ; Kondo, K (Bochum U.) ; Knigsmann, K (Freiburg U.) ; Konopka, R (Munich, Tech. U.) ; Konorov, I (Lebedev Inst.) ; Konstantinov, V F (Serpukhov, IHEP) ; Korzenev, A (Mainz U.) ; Kotzinian, A M (Dubna, JINR) ; Kouznetsov, O (Dubna, JINR) ; Kowalik, K (Warsaw, Inst. Nucl. Studies) ; Krmer, M (Munich, Tech. U.) ; Kral, A (Prague, Tech. U.) ; Kroumchtein, Z V (Dubna, JINR) ; Kuhn, R (Munich, Tech. U.) ; Kunne, F (SPhN, DAPNIA, Saclay) ; Kurek, K (Warsaw, Inst. Nucl. Studies) ; Lauser, L (Freiburg U.) ; Le Goff, J M (SPhN, DAPNIA, Saclay) ; Lednev, A A (Serpukhov, IHEP) ; Lehmann, A (Erlangen - Nuremberg U.) ; Levorato, S (Trieste U.) ; Lichtenstadt, J (Tel Aviv U.) ; Liska, T (Prague, Tech. U.) ; Maggiora, A (INFN, Turin) ; Maggiora, M (Turin U.) ; Magnon, A (SPhN, DAPNIA, Saclay) ; Mallot, G K (CERN) ; Mann, A (Munich, Tech. U.) ; Marchand, C (SPhN, DAPNIA, Saclay) ; Marroncle, J (SPhN, DAPNIA, Saclay) ; Martin, A (Trieste U.) ; Marzec, J (Warsaw U. of Tech.) ; Massmann, F (Bonn U., HISKP) ; Matsuda, T (Miyazaki U.) ; Maximov, A N (Dubna, JINR) ; W Meyer, W (Bochum U.) ; Michigami, T (Yamagata U.) ; Mikhailov, Yu V (Serpukhov, IHEP) ; Moinester, M A (Tel Aviv U.) ; Mutter, A (Freiburg U.) ; Nagaytsev, A (Dubna, JINR) ; Nagel, T (Munich, Tech. U.) ; Nassalski, J (Warsaw, Inst. Nucl. Studies) ; Negrini, T (Bonn U., HISKP) ; Nerling, F (Freiburg U.) ; Neubert, S (Munich, Tech. U.) ; Neyret, D (SPhN, DAPNIA, Saclay) ; Nikolaenko, V I (Serpukhov, IHEP) ; Olshevsky, A G (Dubna, JINR) ; Ostrick, M (Mainz U.) ; Padee, A (Warsaw U. of Tech.) ; Panknin, R (Bonn U.) ; Panzieri, D (Piemonte Orientale U., Alessandria) ; Parsamyan, B (Turin U.) ; Paul, S (Munich, Tech. U.) ; Pawlukiewicz-Kaminska, B (Warsaw, Inst. Nucl. Studies) ; Perevalova, E (Dubna, JINR) ; Pesaro, G (Trieste U.) ; Peshekhonov, D V (Dubna, JINR) ; Piragino, G (Turin U.) ; Platchkov, S (SPhN, DAPNIA, Saclay) ; Pochodzalla, J (Mainz U.) ; Polak, J (Liberec Tech. U.) ; Polyakov, V A (Serpukhov, IHEP) ; Pontecorvo, G (Dubna, JINR) ; Pretz, J (Bonn U.) ; Quintans, C (Lisbon, LIFEP) ; Rajotte, J F (Munich U.) ; Ramos, S (Lisbon, LIFEP) ; Rapatsky, V (Dubna, JINR) ; Reicherz, G (Bochum U.) ; Richter, A (Erlangen - Nuremberg U.) ; Robinet, F (SPhN, DAPNIA, Saclay) ; Rocco, E (Turin U.) ; Rondio, E (Warsaw, Inst. Nucl. Studies) ; Ryabchikov, D I (Serpukhov, IHEP) ; Samoylenko, V D (Serpukhov, IHEP) ; Sandacz, A (Warsaw, Inst. Nucl. Studies) ; Santos, H (Lisbon, LIFEP) ; Sapozhnikov, M G (Dubna, JINR) ; Sarkar, S (Matrivani Inst., Calcutta) ; Savin, Igor A. (Dubna, JINR) ; Sbrizzai, G (Trieste U.) ; Schiavon, P (Trieste U.) ; Schill, C (Freiburg U.) ; Schmitt, L (Munich, Tech. U.) ; Schlter, T (Munich U.) ; Schopferer, S (Freiburg U.) ; Schrder, W (Erlangen - Nuremberg U.) ; Shevchenko, O Yu (Dubna, JINR) ; Siebert, H W (Mainz U.) ; Silva, L (Lisbon, LIFEP) ; Sinha, L (Matrivani Inst., Calcutta) ; Sissakian, A N (Dubna, JINR) ; Slunecka, M (Dubna, JINR) ; Smirnov, G I (Dubna, JINR) ; Sosio, S (Turin U.) ; Sozzi, F (Trieste U.) ; Srnka, A (Inst. Sci. Instruments, Brno) ; Stolarski, M (CERN) ; Sulc, M (Liberec Tech. U.) ; Sulej, R (Warsaw U. of Tech.) ; Takekawa, S (Trieste U.) ; Tessaro, S (INFN, Trieste) ; Tessarotto, F (INFN, Trieste) ; Teufel, A (Erlangen - Nuremberg U.) ; Tkatchev, L G (Dubna, JINR) ; Uhl, S (Munich, Tech. U.) ; Uman, I (Munich U.) ; Virius, M (Prague, Tech. U.) ; Vlassov, N V (Dubna, JINR) ; Vossen, A (Freiburg U.) ; Weitzel, Q (Munich, Tech. U.) ; Windmolders, R (Bonn U.) ; Wislicki, W (Warsaw, Inst. Nucl. Studies) ; Wollny, H (Freiburg U.) ; Zaremba, K (Warsaw U. of Tech.) ; Zavertyaev, M (Lebedev Inst.) ; Zemlyanichkina, E (Dubna, JINR) ; Ziembicki, M (Warsaw U. of Tech.) ; Zhao, J (Mainz U.) ; Zhuravlev, N (Dubna, JINR) ; Zvyagin, A (Munich U.)

Published in: Phys.Lett.
Year: 2010
Vol.: B690
Page No: 466-472
Pages: 12

Abstract: The inclusive double-spin asymmetry, A_1^p, has been measured at COMPASS in deepinelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q2 > 1 (GeV/c)^2, 0.004 < x < 0.7 and improve the statistical precision of g_1^p(x) by a factor of two in the region x < 0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g_1^NS(x,Q2). The isovector quark density, Delta_q_3(x,Q2), is evaluated from a NLO QCD fit of g_1^NS. The first moment of Delta_q3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants g_A/g_V = 1.28+-0.07(stat)+-0.10(syst).

Keyword(s): COMPASS ; Deep inelastic scattering ; Spin ; Structure function ; QCD analysis ; Bjorken sum rule

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