CERN Accelerating science

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
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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.
Copyright/License Preprint: © 2009-2024 CERN (License: CC-BY-3.0)

Corresponding record in: Inspire


 ჩანაწერი შექმნილია 2009-06-10, ბოლოს შესწორებულია 2022-01-14


სრული ტექსტი:
arXiv:0905.2828 - სრული ტექსტის ჩამოტვირთვაPDF
S0370269309010351 - სრული ტექსტის ჩამოტვირთვაXML