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

Authors
Ackerstaff, K Airapetian, A Akopov, N Akushevich, I Amarian, M Ashenauer, EC Avakian, H Avakian, R Avetissian, A Bains, B Baumgarten, C Beckmann, M Belostotski, S Belz, JE Benisch, T Bernreuther, S Bianchi, N Blouw, J Bottcher, H Borissov, A Brack, J Brauksiepe, S Braun, B Bray, B Brons, S Bruckner, W Brull, A Bruins, EEW Bulten, KJ Cadman, RV Capitani, GP Carter, P Chumney, P Cisbani, E Court, GR Dalpiaz, PF De Sanctis, E De Schepper, D Devitsin, E Huberts, PKAD Di Nezza, P Duren, M Dvoredsky, A Elbakian, G Fantoni, A Fechtchenko, A Ferstl, M Fiedler, K Filippone, BW Fischer, H Fox, B Franz, J Frullani, S Funk, MA Gagunashvili, ND Gao, H Garber, Y Garibaldi, F Gavrilov, G Geiger, P Gharibyan, V Giordjian, V Golendukhin, A Graw, G Grebeniouk, O Green, PW Greeniaus, LG Grosshauser, C Gute, A Haeberli, W Hansen, JO Hasch, D Hausser, O Henderson, R Henkes, T Henoch, M Hertenberger, R Holler, Y Holt, RJ Hoprich, W Ihssen, H Iodice, M Izotov, A Jackson, HE Jgoun, A Kaiser, R Kinney, E Kisselev, A Kitching, P Kobayashi, H Koch, N Konigsmann, K Kolstein, M Kolster, H Korotkov, V Korsch, W Kozlov, V Kramer, LH Krivokhijine, VG Kurisuno, M Kyle, G Lachnit, W Lorenzon, W Makins, NCR Manaenkov, SI Martens, FK Martin, JW Masoli, F Mateos, A McAndrew, M McIlhany, K McKeown, RD Menden, FM Meissner, F Metz, A Meyners, N Mikloukho, O Miller, CA Miller, MA Milner, R Mitsyn, V Most, A Mozzetti, R Muccifora, V Nagaitsev, A Naryshkin, Y Nathan, AM Neunreither, F Niczyporuk, M Nowak, WD Nupieri, M O'Neill, TG Ouyang, J Owen, BR Papavassiliou, V Pate, SF Pitt, M Potashov, S Potterveld, DH Rakness, G Reali, A Redwine, R Reolon, AR Ristinen, R Rith, K Roloff, H Rossi, P Rudnitsky, S Ruh, M Ryckbosch, D Sakemi, Y Savin, I Schmidt, F Schmitt, H Schnell, G Schuler, KP Schwind, A Shibata, TA 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, GM van Hunen, JJ de Vyver, RV van den Brand, JFJ van der Steenhoven, G Vetterli, MC Vincter, MG Volk, E Wander, W Williamson, SE Wise, T Woller, K Yoneyama, S Zohrabian, H
Citation
K. Ackerstaff et al., Flavor asymmetry of the light quark sea from semi-inclusive deep-inelasticscattering, PHYS REV L, 81(25), 1998, pp. 5519-5523
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
81
Issue
25
Year of publication
1998
Pages
5519 - 5523
Database
ISI
SICI code
0031-9007(199812)81:25<5519:FAOTLQ>2.0.ZU;2-X
Abstract
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 ti me from semi-inclusive deep-inelastic scattering. The quantity [(d) over ba r(x) - (u) over bar(x)]/[u(x) - d(x)] is derived from a relationship betwee n the yields of positive and negative pions from unpolarized hydrogen and d euterium 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.