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Krakauer, D.; Pellegrino, A.; Anselmo, F.; Bari, G.; Boscherini, D.; Bruni, G.; Cara Romeo, G.; Contin, A.; Coppola, N.; Corradi, M.; Giusti, P.; Amelung, C.; Brock, I.; Deffner, R.; Jakob, H.-P.; Paul, E.; Brook, N.H.; Foster, B.; Heath, G.P.; Mastroberardino, A.; Lee, J.H.; Lim, I.T.; Caldwell, A.; Liu, W.; Sampson, S.; Sciulli, F.; Chwastowski, J.; Figiel, J.; Olkiewicz, K.; Przybycień, M.B.; Przybycień, M.; Suszycki, L.; Dannheim, D.; Desler, K.; Hain, W.; Koch, W.; Kötz, U.; Mankel, R.; Milite, M.; Notz, D.; Rohde, M.; Meyer, A.; Maccarrone, G.; Votano, L.; Markun, P.; Sinclair, L.E.; Wick, K.; Kçira, D.; Lohrmann, E.; Zetsche, F.; Goncalo, R.; Long, K.R.; Tapper, A.D.; Filges, D.; Kuze, M.; Nagano, K.; Lee, S.B.; Park, I.H.; Son, D.; Glasman, C.; Barbi, M.; Bashkirov, V.; Sosnovtsev, V.; Suchkov, S.; Ermolov, P.F.; Khein, L.A.; Korzhavina, I.A.; Lukina, O.Yu; Solomin, A.N.; Bokel, C.; Brümmer, N.; Gilmore, J.; Boogert, S.; Okrasiński, J.R.; Whitmore, J.J.; Iga, Y.; D'Agostini, G.; Epperson, D.; Seiden, A.; Wichmann, R.; Abramowicz, H.; Fusayasu, T.; Inuzuka, M.; Ferrero, M.I.; Ruspa, M.; Fagerstroem, C.-P.; Martin, J.F.; Polenz, S.; Butterworth, J.M.; Jones, T.W.; Ciesielski, R.; Nowak, R.J.; Pawlak, R.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Foudas, C.; Wodarczyk, M.; Bhadra, S.; Hall-Wilton, R.
Physics letters. B, 08/2000, Letnik: 487, Številka: 3Journal Article
The exclusive electroproduction of ω mesons, ep→ eωp, has been studied in the kinematic range 3< Q 2<20 GeV 2, 40< W<120 GeV and | t|<0.6 GeV 2 with the ZEUS detector at HERA using an integrated luminosity of 37.7 pb −1. The ω mesons were identified via the decay ω→ π + π − π 0. The exclusive cross section in the above kinematic region is σ ep→ eωp =0.108±0.014(stat.)±0.026(syst.) nb. The reaction ep→ eφp, φ→ π + π − π 0, has also been measured. The cross sections, as well as the ratios σ γ ∗p→ωp /σ γ ∗p→ρ 0p and σ γ ∗p→ωp /σ γ ∗p→φp , are presented as a function of W and Q 2. Thus, for the first time, the properties of ω electroproduction can be compared to those of ρ 0, φ and J/ ψ electroproduction at high W.
