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  • Measurement of parton distr...
    Aschenauer, E.C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Bianchi, N.; Bonomo, C.; Brüll, A.; Bryzgalov, V.; Burns, J.; Capitani, G.P.; Ciullo, G.; Contalbrigo, M.; Deconinck, W.; De Leo, R.; De Sanctis, E.; Di Nezza, P.; Dreschler, J.; Elalaoui-Moulay, A.; Fabbri, R.; Gabbert, D.; Gapienko, G.; Gapienko, V.; Giordano, F.; Guler, H.; Hadjidakis, C.; Hasch, D.; Hasegawa, T.; Hesselink, W.H.A.; Hill, G.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hristova, I.; Iarygin, G.; Ivanilov, A.; Izotov, A.; Kaiser, R.; Keri, T.; Kisselev, A.; Kobayashi, T.; Krivokhijine, V.G.; Lagamba, L.; Lapikás, L.; Lenisa, P.; Lopez Ruiz, A.; Lu, S.; Ma, B.-Q.; Mahon, D.; Maiheu, B.; Makins, N.C.R.; Marianski, B.; Marukyan, H.; Miller, C.A.; Miyachi, Y.; Muccifora, V.; Mussgiller, A.; Nagaitsev, A.; Nass, A.; Osborne, A.; Pappalardo, L.L.; Perez-Benito, R.; Raithel, M.; Reimer, P.E.; Reolon, A.R.; Riedl, C.; Rosner, G.; Rostomyan, A.; Rubacek, L.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Sanjiev, I.; Schäfer, A.; Schnell, G.; Shibata, T.-A.; Stancari, M.; Statera, M.; Steffens, E.; Steijger, J.J.M.; Tait, P.; Taroian, S.; Tchuiko, B.; Terkulov, A.; Tytgat, M.; van der Nat, P.B.; van der Steenhoven, G.; van Haarlem, Y.; van Hulse, C.; Varanda, M.; Veretennikov, D.; Vikhrov, V.; Vilardi, I.; Vogel, C.; Wang, S.; Yaschenko, S.; Ye, H.; Ye, Y.; Yen, S.; Zihlmann, B.; Zupranski, P.

    Physics letters. B, 09/2008, Volume: 666, Issue: 5
    Journal Article

    The momentum and helicity density distributions of the strange quark sea in the nucleon are obtained in leading order from charged-kaon production in deep-inelastic scattering on the deuteron. The distributions are extracted from spin-averaged K± multiplicities, and from K± and inclusive double-spin asymmetries for scattering of polarized positrons by a polarized deuterium target. The shape of the momentum distribution is softer than that of the average of the u¯ and d¯ quarks. In the region of measurement 0.02<x<0.6 and Q2>1.0 GeV2, the helicity distribution is zero within experimental uncertainties.