Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering

0330551 - ÚPT 2010 RIV NL eng J - Journal Article
Alekseev, M. - Alexakhin, V. Yu. - Alexandrov, Yu. - Alexeev, G. D. - Amoroso, A. - Austregisilio, A. - Badelek, B. - Balestra, F. - Ball, J. - Barth, J. - Baum, G. - Bedfer, Y. - Bernhard, J. - Bertini, R. - Bettinelli, M. - Birsa, R. - Bisplinghoff, J. - Bordalo, P. - Bradamante, F. - Bravar, A. - Bressan, A. - Brona, G. - Burtin, E. - Bussa, M. - Chapiro, A. - Chiosso, M. - Chung, S.U. - Cicuttin, A. - Colantoni, M. - Crespo, M. - Dalla Torre, S. - Dafni, T. - Das, S. - Dasgupta, S. S. - Denisov, O. - Dhara, L. - Diaz, V. - Dinkelbach, A. - Donskov, S. - Doshita, N. - Duic, V. - Dünnweber, W. - Efremov, A.V. - El Alaoui, A. - Eversheim, P. - Eyrich, W. - Faessler, M. - Ferrero, A. - Finger, M. - Finger jr., M. - Fischer, H. - Franco, C. - Friedrich, J. - Garfagnini, R. - Gautheron, F. - Gavrichtchouk, O. - Gazda, R. - Gerassimov, S. - Geyer, R. - Giorgi, M. - Gobbo, B. - Goertz, S. - Grabmüller, S. - Grajek, O. - Grasso, A. - Grube, B. - Gushterski, R. - Guskov, A. - Haas, F. - Hagemann, R. - von Harrach, D. - Hasegawa, T. - Heckmann, J. - Heinsius, F. - Hermann, R. - Herrmann, F. - Hess, C. - Hinterberger, F. - Horikawa, N. - Höppner, Ch. - d'Hose, N. - Ilgner, C. - Ishimoto, S. - Ivanov, O. - Ivanshin, Yu. - Iwata, T. - Jahn, R. - Jasinski, P. - Jegou, G. - Joosten, R. - Kabuss, E. - Käfer, W. - Kang, D. - Ketzer, B. - Khaustov, G. - Khokhlov, Y. - Kiefer, J. - Kisselev, Y. - Klein, F. - Klimaszewski, K. - Koblitz, S. - Koivuniemi, J. - Kolosov, V. - Komissarov, E. - Kondo, K. - Königsmann, K. - Konopka, R. - Konorov, I. - Konstantinov, V. - Korzenev, A. - Kotzinian, A. - Kouznetsov, O. - Kowalik, K. - Krämer, M. - Kral, A. - Kroumchtein, Z. - Kuhn, R. - Kunne, F. - Kurek, K. - Le Goff, J. - Lednev, A. - Lehmann, A. - Levorato, S. - Lichtenstadt, J. - Liska, T. - Maggiora, A. - Maggiora, M. - Magnon, A. - Mallot, G. - Mann, A. - Marchand, C. - Marroncle, J. - Martin, A. - Marzec, J. - Massmann, F. - Matsuda, T. - Maximov, A. - Meyer, W. - Michigami, T. - Mikhailov, Y. - Moinester, M. - Mutter, A. - Nagaytsev, A. - Nagel, T. - Nassalski, J. - Negrini, S. - Nerling, F. - Neubert, S. - Neyret, D. - Nikolaenko, V. - Olshevsky, A. - Ostrick, M. - Padee, A. - Panknin, R. - Panzieri, D. - Parsamyan, B. - Paul, S. - Pawlukiewicz-Kaminska, B. - Perevalova, E. - Pesaro, G. - Peshekhonov, D. - Piragino, G. - Platchkov, S. - Pochodzalla, J. - Polak, J. - Polyakov, V. - Pontecorvo, G. - Pretz, J. - Quintans, C. - Rajotte, J. - Ramos, S. - Rapatsky, V. - Reicherz, G. - Reggiani, D. - Richter, A. - Robinet, F. - Rocco, E. - Rondio, E. - Ryabchikov, D. - Samoylenko, V. - Sandacz, A. - Santos, H. - Sapozhnikov, M. - Sarkar, S. - Savin, I. - Sbrizzai, G. - Schiavon, P. - Schill, C. - Schmitt, L. - Schröder, W. - Shevchenko, O. - Siebert, H. - Silva, L. - Sinha, L. - Sissakian, A. - Slunecka, M. - Smirnov, G. - Sosio, S. - Sozzi, F. - Srnka, Aleš - Stolarski, M. - Sulc, M. - Sulej, R. - Takekawa, S. - Tessaro, S. - Tessarotto, F. - Teufel, A. - Tkatchev, L. - Venugopal, G. - Virius, M. - Vlassov, N. - Vossen, A. - Weitzel, Q. - Wenzl, K. - Windmolders, R. - Wislicki, W. - Wollny, H. - Zaremba, K. - Zavertyaev, M. - Zemlyanichkina, E. - Ziembicki, M. - Zhao, J. - Zhuravlev, N. - Zvyagin, A.
Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering.
Physics Letters. B. Roč. 680, č. 5 (2009), s. 217-224. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA MŠMT ME 492
Institutional research plan: CEZ:AV0Z20650511
Keywords : COMPASS * double-spin asymmetry * helicity density * Parton distribution function * flavour separation analysis * polarised DIS and SIDIS reactions * charged kaon asymmetry
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 5.083, year: 2009

We present a LO evaluation of helicity densities of valence, non-strange sea and strange quarks. They have been obtained from the inclusive asymmetry and the semi-inclusive asymmetries measured in polarised deep inelastic muon–deuteron scattering. The full deuteron statistics of COMPASS (years 2002–2004 and 2006) has been used. Both non-strange densities are found to be in a good agreement with previous measurements. The distribution 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 upon the choice of fragmentation functions used in the derivation is discussed.
Permanent Link: http://hdl.handle.net/11104/0176317