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Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering

Ackerstaff, K. and Airapetian, A. and Akopov, N. and Akushevich, I. and Amarian, M. and Ashenauer, E. C. and Avakian, H. and Avakian, R. and Avetissian, A. and Bains, B. and Baumgarten, C. and Beckmann, M. and Belostotski, St. and Belz, J. E. and Benisch, Th. and Bernreuther, S. and Bianchi, N. and Blouw, J. and Böttcher, H. and Borissov, A. and Brack, J. and Brauksiepe, S. and Braun, B. and Bray, B. and Brons, St. and Brückner, W. and Brüll, A. and Bruins, E. E. W. and Bulten, H. J. and Cadman, R. V. and Capitani, G. P. and Carter, P. and Chumney, P. and Cisbani, E. and Court, R. and Dalpiaz, P. F. and De Sanctis, E. and De Schepper, D. and Devitsin, E. and de Witt Huberts, P. K. A. and Di Nezza, P. and Düren, M. and Dvoredsky, A. and Elbakian, G. and Fantoni, A. and Fechtchenko, A. and Ferstl, M. and Fiedler, K. and Filippone, B. W. and Fischer, H. and Fox, B. and Franz, J. and Frullani, S. and Funk, M.-A. and Gagunashvili, N. D. and Gao, H. and Gärber, Y. and Garibaldi, F. and Gavrilov, G. and Geiger, P. and Gharibyan, V. and Giordjian, V. and Golendukhin, A. and Graw, G. and Grebeniouk, O. and Green, P. W. and Greeniaus, L. G. and Grosshauser, C. and Gute, A. and Haeberli, W. and Hansen, J.-O. and Hasch, D. and Häusser, O. and Henderson, R. and Henkes, Th. and Henoch, M. and Hertenberger, R. and Holler, Y. and Holt, R. J. and Hoprich, W. and Ihssen, H. and Iodice, M. and Izotov, A. and Jackson, H. E. and Jgoun, A. and Kaiser, R. and Kinney, E. and Kisselev, A. and Kitching, P. and Kobayashi, H. and Koch, N. and Königsmann, K. and Kolstein, M. and Kolster, H. and Korotkov, V. and Korsch, W. and Kozlov, V. and Kramer, L. H. and Krivokhijine, V. G. and Kurisuno, M. and Kyle, G. and Lachnit, W. and Lorenzon, W. and Makins, N. C. R. and Manaenkov, S. I. and Martens, F. K. and Martin, J. W. and Masoli, F. and Mateos, A. and McAndrew, M. and McIlhany, K. and McKeown, R. D. and Menden, F. M. and Meissner, F. and Metz, A. and Meyners, N. and Mikloukho, O. and Miller, C. A. and Miller, M. A. and Milner, R. and Mitsyn, V. and Most, A. and Mozzetti, R. and Muccifora, V. and Nagaitsev, A. and Naryshkin, Y. and Nathan, A. M. and Neunreither, F. and Niczyporuk, M. and Nowak, W.-D. and Nupieri, M. and O'Neill, T. G. and Ouyang, J. and Owen, B. R. and Papavassiliou, V. and Pate, S. F. and Pitt, M. and Potashov, S. and Potterveld, D. H. and Rakness, G. and Reali, A. and Redwine, R. and Reolon, A. R. and Ristinen, R. and Rith, K. and Roloff, H. and Rossi, P. and Rudnitsky, S. and Ruh, M. and Ryckbosch, D. and Sakemi, Y. and Savin, I. and Schmidt, F. and Schmitt, H. and Schnell, G. and Schüler, K. P. and Schwind, A. and Shibata, T.-A. and Shibatani, K. and Shin, T. and Shutov, V. and Simani, C. and Simon, A. and Sinram, K. and Slavich, P. and Spengos, M. and Steffens, E. and Stenger, J. and Stewart, J. and Stoesslein, U. and Sutter, M. and Tallini, H. and Taroian, S. and Terkulov, A. and Tipton, B. and Tytgat, M. and Urciuoli, G. M. and van Hunen, J. J. and van de Vyver, R. and van den Brand, J. F. J. and van der Steenhoven, G. and Vetterli, M. C. and Vincter, M. G. and Volk, E. and Wander, W. and Williamson, S. E. and Wise, T. and Woller, K. and Yoneyama, S. and Zohrabian, H. (1998) Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering. Physical Review Letters, 81 (25). pp. 5519-5523. ISSN 0031-9007.

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The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02 < x < 0.3 and 1 < Q(2) < 10 GeV2 for the first time from semi-inclusive deep-inelastic scattering. The quantity [(d) over bar(x) - (u) over bar(x)]/[u(x) - d(x)] is derived from a relationship between the yields of positive and negative pions from unpolarized hydrogen and deuterium targets. The flavor asymmetry (d) over bar - (u) over bar is found to be nonzero and x dependent, showing an excess of (d) over bar over (u) over bar quarks in the proton.

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Additional Information:© 1998 American Physical Society. Received 15 July 1998; revised 12 October 1998. We gratefully acknowledge the DESY management for its support and the DESY staff and the staffs of the collaborating institutions. This work was supported by the FWO-Flanders, Belgium; the Natural Sciences and Engineering Research Council of Canada; the INTAS, HCM, and TMR network contributions from the European Community; the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie; the Deutscher Akademischer Austauschdienst (DAAD); the Italian Istituto Nazionale di Fisica Nucleare (INFN); Monbusho, JSPS, and Toray Science Foundation of Japan; the Dutch Foundation for Fundamenteel Onderzoek der Materie (FOM); the U.K. Particle Physics and Astronomy Research Council; and the U.S. Department of Energy and National Science Foundation.
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Fonds voor Wetenschappelijk Onderzoek (FWO), BelgiumUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
European CommunityUNSPECIFIED
Bundesministerium für Bildung, Wissenschaft, Forschung und TechnologieUNSPECIFIED
Deutscher Akademischer Austauschdienst (DAAD)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN) (Italy)UNSPECIFIED
Japanese Society for the Promotion of ScienceUNSPECIFIED
Toray Science FoundationUNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC) (UK)UNSPECIFIED
Department of EnergyUNSPECIFIED
National Science FoundationUNSPECIFIED
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13121
Deposited By: Tony Diaz
Deposited On:30 Jan 2009 00:35
Last Modified:26 Dec 2012 10:45

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