/ Experiment-HEP hep-ex/0307064


Flavor decomposition of the sea quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering


Airapetian, A. ; Akopov, N. ; Akopov, Z. ; Amarian, M. ; Ammosov, V.V. ; Andrus, A. ; Aschenauer, E.C. ; Augustyniak, W. ; Avakian, R. ; Avetissian, A. ; Avetissian, E. ; Bailey, P. ; Baturin, V. ; Baumgarten, C. ; Beckmann, M. ; Belostotski, S. ; Bernreuther, S. ; Bianchi, N. ; Blok, H.P. ; Bottcher, H. ; Borissov, A. ; Bouwhuis, M. ; Brack, J. ; Brull, A. ; Bryzgalov, V. ; Capitani, G.P. ; Chiang, H.C. ; Ciullo, G. ; Contalbrigo, M. ; Dalpiaz, P.F. ; De Leo, R. ; De Nardo, L. ; De Sanctis, E. ; Devitsin, E. ; Di Nezza, P. ; Duren, M. ; Ehrenfried, M. ; Elalaoui-Moulay, A. ; Elbakian, G. ; Ellinghaus, F. ; Elschenbroich, U. ; Ely, J. ; Fabbri, R. ; Fantoni, A. ; Fechtchenko, A. ; Felawka, L. ; Fox, B. ; Franz, J. ; Frullani, S. ; Garber, Y. ; Gapienko, G. ; Gapienko, V. ; Garibaldi, F. ; Garrow, K. ; Garutti, E. ; Gaskell, D. ; Gavrilov, G. ; Gharibyan, V. ; Graw, G. ; Grebeniouk, O. ; Greeniaus, L.G. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Heesbeen, D. ; Henoch, M. ; Hertenberger, R. ; Hesselink, W.H.A. ; Hillenbrand, A. ; Hoek, M. ; Holler, Y. ; Hommez, B. ; Iarygin, G. ; Ivanilov, A. ; Izotov, A. ; Jackson, H.E. ; Jgoun, A. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Konigsmann, Kay ; Kopytin, M. ; Korotkov, V. ; Kozlov, V. ; Krauss, B. ; Krivokhijine, V.G. ; Lagamba, L. ; Lapikas, L. ; Laziev, A. ; Lenisa, P. ; Liebing, P. ; Lindemann, T. ; Lipka, K. ; Lorenzon, W. ; Lu, J. ; Maiheu, B. ; Makins, N.C.R. ; Marianski, B. ; Marukyan, H. ; Masoli, F. ; Mexner, V. ; Meyners, N. ; Mikloukho, O. ; Miller, C.A. ; Miyachi, Y. ; Muccifora, V. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Negodaev, M. ; Nowak, W.D. ; Oganessyan, K. ; Ohsuga, H. ; Orlandi, G. ; Pickert, N. ; Potashov, S. ; Potterveld, David H. ; Raithel, M. ; Reggiani, D. ; Reimer, P.E. ; Reischl, A. ; Reolon, A.R. ; Riedl, C. ; Rith, K. ; Rosner, G. ; Rostomyan, A. ; Rubacek, L. ; Ryckbosch, D. ; Salomatin, Y. ; Sanjiev, I. ; Savin, Igor A. ; Scarlett, C. ; Schafer, A. ; Schill, C. ; Schnell, G. ; Schuler, K.P. ; Schwind, A. ; Seele, J. ; Seidl, R. ; Seitz, B. ; Shanidze, R. ; Shearer, C. ; Shibata, T.A. ; Shutov, V. ; Simani, M.C. ; Sinram, K. ; Stancari, M. ; Statera, M. ; Steffens, E. ; Steijger, J.J.M. ; Stewart, J. ; Stosslein, U. ; Tait, P. ; Tanaka, H. ; Taroian, S. ; Tchuiko, B. ; Terkulov, A. ; Tkabladze, A. ; Trzcinski, A. ; Tytgat, M. ; Vandenbroucke, A. ; van der Nat, P. ; van der Steenhoven, G. ; Vetterli, M.C. ; Vikhrov, V. ; Vincter, M.G. ; Visser, J. ; Vogel, C. ; Vogt, M. ; Volmer, J. ; Weiskopf, C. ; Wendland, J. ; Wilbert, J. ; Ybeles Smit, G. ; Yen, S. ; Zihlmann, B. ; Zohrabian, H. ; Zupranski, P.

Published in: Phys.Rev.Lett.
Year: 2004
Vol.: 92
Page No: 012005
Pages: 5

Abstract: Double-spin asymmetries of semi-inclusive cross sections for the production of identified pions and kaons have been measured in deep-inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with re-analyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data.

Web-Page: http://www.adsabs.harvard.edu/abs/2004PhRvL..92a2005A; http://dx.doi.org/10.1103/PhysRevLett.92.012005; http://link.aps.org/abstract/PRL/V92/E012005

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