მთავარი > CERN Experiments > Fixed Target Experiments > COMPASS > COMPASS Conference Proceedings > Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering |
Article | |
Report number | arXiv:0905.2828 ; CERN-PH-EP-2009-008 ; CERN-PH-EP-2009-008 |
Title | Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering |
Related title | flavor |
Author(s) |
Alekseev, M. (Piemonte Orientale U., Alessandria ; INFN, Turin) ; Alexakhin, V.Yu. (Dubna, JINR) ; Alexandrov, Yu. (Lebedev Inst., Astro Space Ctr.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (Turin U. ; INFN, Turin) ; Austregesilo, A. (CERN ; Munich, Tech. U.) ; Badelek, B. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Balestra, F. (Turin U. ; 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. (Turin U. ; INFN, Turin) ; Bettinelli, M. (Munich U.) ; Birsa, R. (INFN, Trieste) ; Bisplinghoff, J. (Bonn U., HISKP) ; Bordalo, P. (LIP, Lisbon ; Lisbon, Tech. U.) ; Bradamante, F. (Trieste U. ; INFN, Trieste) ; Bravar, A. (INFN, Trieste) ; Bressan, A. (Trieste U. ; INFN, Trieste) ; Brona, G. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Burtin, E. (SPhN, DAPNIA, Saclay) ; Bussa, M.P. (Turin U. ; INFN, Turin) ; Chapiro, A. (ICTP, Trieste ; INFN, Trieste) ; Chiosso, M. (Turin U. ; INFN, Turin) ; Chung, S.U. (Munich, Tech. U.) ; Cicuttin, A. (INFN, Trieste ; ICTP, Trieste) ; Colantoni, M. (INFN, Turin) ; Crespo, M.L. (INFN, Trieste ; ICTP, 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 ; ICTP, Trieste) ; Dinkelbach, A.M. (Munich, Tech. U.) ; Donskov, S.V. (Serpukhov, IHEP) ; Doshita, N. (Ruhr U., Bochum ; Yamagata U.) ; Duic, V. (Trieste U. ; 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. (Turin U. ; INFN, Turin ; CERN) ; Finger, Miroslav (Charles U.) ; Finger, M., Jr. (Dubna, JINR) ; Fischer, H. (Freiburg U.) ; Franco, C. (LIP, Lisbon) ; Friedrich, J.M. (Munich, Tech. U.) ; Garfagnini, R. (Turin U. ; INFN, Turin) ; Gautheron, F. (Bielefeld U.) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gazda, R. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Gerassimov, S. (Lebedev Inst., Astro Space Ctr. ; Munich, Tech. U.) ; Geyer, R. (Munich U.) ; Giorgi, M. (Trieste U. ; INFN, Trieste) ; Gobbo, B. (INFN, Trieste) ; Goertz, S. (Ruhr U., Bochum ; Bonn U.) ; Grabmuller, S. (Munich, Tech. U.) ; Grajek, O.A. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Grasso, A. (Turin U. ; 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. (Nagoya U. ; Chubu U.) ; Hoppner, Ch. (Munich, Tech. U.) ; d'Hose, N. (SPhN, DAPNIA, Saclay) ; Ilgner, C. (CERN ; Munich U.) ; Ishimoto, S. (Nagoya U. ; 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. (Bielefeld U. ; Ruhr U., Bochum) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (Warsaw, Inst. Nucl. Studies ; 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. (Ruhr U., Bochum ; Yamagata U.) ; Konigsmann, K. (Freiburg U.) ; Konopka, R. (Munich, Tech. U.) ; Konorov, I. (Lebedev Inst., Astro Space Ctr. ; Munich, Tech. U.) ; Konstantinov, V.F. (Serpukhov, IHEP) ; Korzenev, A. (Mainz U., Inst. Kernphys.) ; Kotzinian, A.M. (Dubna, JINR ; SPhN, DAPNIA, Saclay) ; Kouznetsov, O. (Dubna, JINR ; SPhN, DAPNIA, Saclay) ; Kowalik, K. (Warsaw, Inst. Nucl. Studies ; Warsaw U. ; 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, Inst. Nucl. Studies ; Warsaw U.) ; Le Goff, J.M. (SPhN, DAPNIA, Saclay) ; Lednev, A.A. (Serpukhov, IHEP) ; Lehmann, A. (Erlangen - Nuremberg U.) ; Levorato, S. (Trieste U. ; INFN, Trieste) ; Lichtenstadt, J. (Tel Aviv U.) ; Liska, T. (Prague, Tech. U.) ; Maggiora, A. (INFN, Turin) ; Maggiora, M. (Turin U. ; 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. (Trieste U. ; 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. (Freiburg U. ; Mainz U., Inst. Kernphys.) ; Nagaytsev, A. (Dubna, JINR) ; Nagel, T. (Munich, Tech. U.) ; Nassalski, J. (Warsaw, Inst. Nucl. Studies ; 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. (Bonn U. ; Mainz U., Inst. Kernphys.) ; Padee, A. (Warsaw U. of Tech.) ; Panknin, R. (Bonn U.) ; Panzieri, D. (Piemonte Orientale U., Alessandria ; INFN, Turin) ; Parsamyan, B. (Turin U. ; INFN, Turin) ; Paul, S. (Munich, Tech. U.) ; Pawlukiewicz-Kaminska, B. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Perevalova, E. (Dubna, JINR) ; Pesaro, G. (Trieste U. ; INFN, Trieste) ; Peshekhonov, D.V. (Dubna, JINR) ; Piragino, G. (Turin U. ; INFN, Turin) ; Platchkov, S. (SPhN, DAPNIA, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polak, J. (Liberec Tech. U. ; Trieste U. ; INFN, Trieste) ; Polyakov, V.A. (Serpukhov, IHEP) ; Pontecorvo, G. (Dubna, JINR) ; Pretz, J. (Bonn U.) ; Quintans, C. (LIP, Lisbon) ; Rajotte, J.F. (Munich U.) ; Ramos, S. (LIP, Lisbon ; 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. (Turin U. ; INFN, Turin) ; Rondio, E. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Ryabchikov, D.I. (Serpukhov, IHEP) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Sandacz, A. (Warsaw, Inst. Nucl. Studies ; Warsaw U.) ; Santos, H. (LIP, Lisbon ; Lisbon, Tech. U.) ; Sapozhnikov, M.G. (Dubna, JINR) ; Sarkar, S. (Matrivani Inst., Calcutta) ; Savin, I.A. (Dubna, JINR) ; Sbrizzai, G. (Trieste U. ; INFN, Trieste) ; Schiavon, P. (Trieste U. ; INFN, Trieste) ; Schill, C. (Freiburg U.) ; Schmitt, L. (Munich, Tech. U. ; Darmstadt, GSI) ; Schroder, W. (Erlangen - Nuremberg U.) ; Shevchenko, O.Yu. (Dubna, JINR) ; Siebert, H.W. (Mainz U., Inst. Kernphys.) ; Silva, L. (LIP, Lisbon) ; Sinha, L. (Matrivani Inst., Calcutta) ; Sissakian, A.N. (Dubna, JINR) ; Slunecka, M. (Dubna, JINR) ; Smirnov, G.I. (Dubna, JINR) ; Sosio, S. (Turin U. ; INFN, Turin) ; Sozzi, F. (Trieste U. ; INFN, Trieste) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Stolarski, M. (Warsaw, Inst. Nucl. Studies ; Warsaw U. ; CERN) ; Sulc, M. (Liberec Tech. U.) ; Sulej, R. (Warsaw U. of Tech.) ; Takekawa, S. (Trieste U. ; 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, Inst. Nucl. Studies ; 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. (Mainz U., Inst. Kernphys. ; INFN, Trieste) ; Zhuravlev, N. (Dubna, JINR) ; Zvyagin, A. (Munich U.) |
Publication | 2009 |
Imprint | 19 May 2009 |
Number of pages | 15 |
Note | Comments: 15 pages, 8 figures 15 pages, 8 figures |
In: | Phys. Lett. B 680 (2009) 217-224 |
DOI | 10.1016/j.physletb.2009.08.065 |
Subject category | Particle Physics - Experiment |
Accelerator/Facility, Experiment | CERN SPS ; COMPASS NA58 |
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. |
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