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

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

doi:10.1103/PhysRevLett.81.5519

Published December 21, 1998 | Version Published

Journal Article Open

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

1. Deutsches Elektronen-Synchrotron DESY
2. Alikhanyan National Laboratory
3. Istituto Superiore di Sanità
4. Ghent University
5. Max Planck Institute for Nuclear Physics
6. National Laboratory of Frascati
7. University of Illinois Urbana-Champaign
8. Ludwig-Maximilians-Universität München
9. University of Freiburg
10. Petersburg Nuclear Physics Institute
11. Simon Fraser University
12. TRIUMF
13. University of Erlangen-Nuremberg
14. National Institute for Subatomic Physics
15. University of Colorado Boulder
16. California Institute of Technology
17. Massachusetts Institute of Technology
18. University of Wisconsin–Madison
19. VU Amsterdam
20. New Mexico State University
21. University of Liverpool
22. University of Ferrara
23. P.N. Lebedev Physical Institute of the Russian Academy of Sciences
24. Joint Institute for Nuclear Research
25. Argonne National Laboratory
26. Philipp University of Marburg
27. University of Alberta
28. University of Kentucky
29. Florida International University
30. University of Michigan–Ann Arbor

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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© 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), Belgium
Natural Sciences and Engineering Research Council of Canada (NSERC)
European Community
Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie
Deutscher Akademischer Austauschdienst (DAAD)
Istituto Nazionale di Fisica Nucleare (INFN) (Italy)
Monbukagakusho
Japanese Society for the Promotion of Science
Toray Science Foundation
Stichting voor Fundamenteel Onderzoek der Materie (FOM)
Particle Physics and Astronomy Research Council (PPARC) (UK)
Department of Energy
National Science Foundation

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

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

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