/ Experiment-HEP arXiv:0905.2828


Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering


Alekseev, M. (INFN, Turin) ; Alexakhin, V.Yu. (Dubna, JINR) ; Alexandrov, Yu. (Lebedev Inst., Astro Space Ctr.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (INFN, Turin) ; Austregesilo, A. (Munich, Tech. U.) ; Badelek, B. (Warsaw U.) ; Balestra, F. (INFN, Turin) ; Ball, J. (SPhN, DAPNIA, Saclay) ; Barth, J. (Bonn U.) ; Baum, G. (Bielefeld U.) ; Bedfer, Y. (SPhN, DAPNIA, Saclay) ; Bernhard, J. (Mainz U., Inst. Kernphys.) ; Bertini, R. (INFN, Turin) ; Bettinelli, M. (Munich U.) ; Birsa, R. (INFN, Trieste) ; Bisplinghoff, J. (Bonn U., HISKP) ; Bordalo, P. (Lisbon, Tech. U.) ; Bradamante, F. (INFN, Trieste) ; Bravar, A. (INFN, Trieste) ; Bressan, A. (INFN, Trieste) ; Brona, G. (Warsaw U.) ; Burtin, E. (SPhN, DAPNIA, Saclay) ; Bussa, M.P. (INFN, Turin) ; Chapiro, A. (INFN, Trieste) ; Chiosso, M. (INFN, Turin) ; Chung, S.U. (Munich, Tech. U.) ; Cicuttin, A. (INFN, Trieste) ; Colantoni, M. (INFN, Turin) ; Crespo, M.L. (INFN, Trieste) ; Dalla Torre, S. (INFN, Trieste) ; Dafni, T. (SPhN, DAPNIA, Saclay) ; Das, S. (Matrivani Inst., Calcutta) ; Dasgupta, S.S. (Burdwan U.) ; Denisov, O.Yu. (INFN, Turin) ; Dhara, L. (Matrivani Inst., Calcutta) ; Diaz, V. (INFN, Trieste) ; Dinkelbach, A.M. (Munich, Tech. U.) ; Donskov, S.V. (Serpukhov, IHEP) ; Doshita, N. (Yamagata U.) ; Duic, V. (INFN, Trieste) ; Dunnweber, 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. (CERN) ; Finger, M. (Charles U.) ; Finger, M. (Dubna, JINR) ; Fischer, H. (Freiburg U.) ; Franco, C. (Lisbon, LIFEP) ; Friedrich, J.M. (Munich, Tech. U.) ; Garfagnini, R. (INFN, Turin) ; Gautheron, F. (Bielefeld U.) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gazda, R. (Warsaw U.) ; Gerassimov, S. (Munich, Tech. U.) ; Geyer, R. (Munich U.) ; Giorgi, M. (INFN, Trieste) ; Gobbo, B. (INFN, Trieste) ; Goertz, S. (Bonn U.) ; Grabmuller, S. (Munich, Tech. U.) ; Grajek, O.A. (Warsaw U.) ; Grasso, A. (INFN, Turin) ; Grube, B. (Munich, Tech. U.) ; Gushterski, R. (Dubna, JINR) ; Guskov, A. (Dubna, JINR) ; Haas, F. (Munich, Tech. U.) ; Hagemann, R. (Freiburg U.) ; von Harrach, D. (Mainz U., Inst. Kernphys.) ; Hasegawa, T. (Miyazaki U.) ; Heckmann, J. (Ruhr U., Bochum) ; Heinsius, F.H. (Freiburg U.) ; Hermann, R. (Mainz U., Inst. Kernphys.) ; Herrmann, F. (Freiburg U.) ; Hess, C. (Ruhr U., Bochum) ; Hinterberger, F. (Bonn U., HISKP) ; Horikawa, N. (Chubu U.) ; Hoppner, Ch. (Munich, Tech. U.) ; d'Hose, N. (SPhN, DAPNIA, Saclay) ; Ilgner, C. (Munich U.) ; Ishimoto, S. (KEK, Tsukuba) ; Ivanov, O. (Dubna, JINR) ; Ivanshin, Yu. (Dubna, JINR) ; Iwata, T. (Yamagata U.) ; Jahn, R. (Bonn U., HISKP) ; Jasinski, P. (Mainz U., Inst. Kernphys.) ; Jegou, G. (SPhN, DAPNIA, Saclay) ; Joosten, R. (Bonn U., HISKP) ; Kabuss, E. (Mainz U., Inst. Kernphys.) ; Kafer, W. (Freiburg U.) ; Kang, D. (Freiburg U.) ; Ketzer, B. (Munich, Tech. U.) ; Khaustov, G.V. (Serpukhov, IHEP) ; Khokhlov, Yu.A. (Serpukhov, IHEP) ; Kiefer, J. (Freiburg U.) ; Kisselev, Yu. (Ruhr U., Bochum) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (Warsaw U.) ; Koblitz, S. (Mainz U., Inst. Kernphys.) ; Koivuniemi, J.H. (Ruhr U., Bochum) ; Kolosov, V.N. (Serpukhov, IHEP) ; Komissarov, E.V. (Dubna, JINR) ; Kondo, K. (Yamagata U.) ; Konigsmann, K. (Freiburg U.) ; Konopka, R. (Munich, Tech. U.) ; Konorov, I. (Munich, Tech. U.) ; Konstantinov, V.F. (Serpukhov, IHEP) ; Korzenev, A. (Mainz U., Inst. Kernphys.) ; Kotzinian, A.M. (SPhN, DAPNIA, Saclay) ; Kouznetsov, O. (SPhN, DAPNIA, Saclay) ; Kowalik, K. (SPhN, DAPNIA, Saclay) ; Kramer, 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 U.) ; Le Goff, J.M. (SPhN, DAPNIA, Saclay) ; Lednev, A.A. (Serpukhov, IHEP) ; Lehmann, A. (Erlangen - Nuremberg U.) ; Levorato, S. (INFN, Trieste) ; Lichtenstadt, J. (Tel Aviv U.) ; Liska, T. (Prague, Tech. U.) ; Maggiora, A. (INFN, Turin) ; Maggiora, M. (INFN, Turin) ; 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. (INFN, Trieste) ; Marzec, J. (Warsaw U. of Tech.) ; Massmann, F. (Bonn U., HISKP) ; Matsuda, T. (Miyazaki U.) ; Maximov, A.N. (Dubna, JINR) ; Meyer, W. (Ruhr U., Bochum) ; Michigami, T. (Yamagata U.) ; Mikhailov, Yu.V. (Serpukhov, IHEP) ; Moinester, M.A. (Tel Aviv U.) ; Mutter, A. (Mainz U., Inst. Kernphys.) ; Nagaytsev, A. (Dubna, JINR) ; Nagel, T. (Munich, Tech. U.) ; Nassalski, J. (Warsaw U.) ; Negrini, S. (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., Inst. Kernphys.) ; Padee, A. (Warsaw U. of Tech.) ; Panknin, R. (Bonn U.) ; Panzieri, D. (INFN, Turin) ; Parsamyan, B. (INFN, Turin) ; Paul, S. (Munich, Tech. U.) ; Pawlukiewicz-Kaminska, B. (Warsaw U.) ; Perevalova, E. (Dubna, JINR) ; Pesaro, G. (INFN, Trieste) ; Peshekhonov, D.V. (Dubna, JINR) ; Piragino, G. (INFN, Turin) ; Platchkov, S. (SPhN, DAPNIA, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polak, J. (INFN, Trieste) ; 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, Tech. U.) ; Rapatsky, V. (Dubna, JINR) ; Reicherz, G. (Ruhr U., Bochum) ; Reggiani, D. (CERN) ; Richter, A. (Erlangen - Nuremberg U.) ; Robinet, F. (SPhN, DAPNIA, Saclay) ; Rocco, E. (INFN, Turin) ; Rondio, E. (Warsaw U.) ; Ryabchikov, D.I. (Serpukhov, IHEP) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Sandacz, A. (Warsaw U.) ; Santos, H. (Lisbon, Tech. U.) ; Sapozhnikov, M.G. (Dubna, JINR) ; Sarkar, S. (Matrivani Inst., Calcutta) ; Savin, I.A. (Dubna, JINR) ; Sbrizzai, G. (INFN, Trieste) ; Schiavon, P. (INFN, Trieste) ; Schill, C. (Freiburg U.) ; Schmitt, L. (Darmstadt, GSI) ; Schroder, W. (Erlangen - Nuremberg U.) ; Shevchenko, O.Yu. (Dubna, JINR) ; Siebert, H.W. (Mainz U., Inst. Kernphys.) ; 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. (INFN, Turin) ; Sozzi, F. (INFN, Trieste) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Stolarski, M. (CERN) ; Sulc, M. (Liberec Tech. U.) ; Sulej, R. (Warsaw U. of Tech.) ; Takekawa, S. (INFN, Trieste) ; Tessaro, S. (INFN, Trieste) ; Tessarotto, F. (INFN, Trieste) ; Teufel, A. (Erlangen - Nuremberg U.) ; Tkatchev, L.G. (Dubna, JINR) ; Venugopal, G. (Bonn U., HISKP) ; Virius, M. (Prague, Tech. U.) ; Vlassov, N.V. (Dubna, JINR) ; Vossen, A. (Freiburg U.) ; Weitzel, Q. (Munich, Tech. U.) ; Wenzl, K. (Freiburg U.) ; Windmolders, R. (Bonn U.) ; Wislicki, W. (Warsaw U.) ; Wollny, H. (Freiburg U.) ; Zaremba, K. (Warsaw U. of Tech.) ; Zavertyaev, M. (Lebedev Inst., Astro Space Ctr.) ; Zemlyanichkina, E. (Dubna, JINR) ; Ziembicki, M. (Warsaw U. of Tech.) ; Zhao, J. (INFN, Trieste) ; Zhuravlev, N. (Dubna, JINR) ; Zvyagin, A. (Munich U.)

Published in: Phys.Lett.
Year: 2009
Vol.: B680
Page No: 217-224
Pages: 15

Abstract: We present a LO evaluation of helicity densities of valence, \Delta u_v+\Delta d_v, non-strange sea, \Delta\bar{u}+\Delta\bar{d}, and strange quarks, \Delta s (assumed to be equal to \Delta\bar{s}). They have been obtained from the inclusive asymmetry A_{3,d} and the semi-inclusive asymmetries A^{\pi+}_{1,d}, A^{\pi-}_{1,d}, A^{K+}_{1,d}, A^{K-}_{1,d} measured in polarised deep inelastic muon-deuteron scattering. The full deuteron statistics of COMPASS (years 2002-2004 and 2006) has been used. The data cover the range Q^2 > 1 (GeV/c)^2 and 0.004<x<0.3. Both non-strange densities are found to be in a good agreement with previous measurements. The distribution of \Delta s(x) is compatible with zero in the whole measured range, in contrast to the shape of the strange quark helicity distribution obtained in most LO and NLO QCD fits. The sensitivity of the values of \Delta s(x) upon the choice of fragmentation functions used in the derivation is discussed.

Keyword(s): COMPASS ; Double-spin asymmetry ; Helicity density ; Parton distribution function ; Flavour separation analysis ; Polarised DIS and SIDIS reactions ; Charged kaon asymmetry

Web-Page: http://durpdg.dur.ac.uk/cgi-hepdata/hepreac/8277699

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