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Affolder, T; Anikeev, K; Antos, J; Azfar, F; de Barbaro, P; Barbaro-Galtieri, A; Baroiant, S; Beretvas, A; Berge, J P; Binkley, M; Blair, R E; Blocker, C; Bodek, A; Bortoletto, D; van den Brink, S; Bromberg, C; Brozovic, M; Bruner, N; Carlsmith, D; Chan, A W; Chertok, M; Conway, J; Cranshaw, J; Dell'Orso, M; Elias, J E; Fiori, I; Gallinaro, M; Gao, T; Gold, M; Gordon, A; Guimaraes da Costa, J; Haber, C; Hara, K; Harris, R M; Hatakeyama, K; Herndon, M; Holck, C; Huth, J; Introzzi, G; Iwai, J; Iwata, Y; James, E; Kikuchi, T; Kim, M J; Kim, S H; Kondo, K; Kuhlmann, S E; Kuwabara, T; Lancaster, J; Lander, R; LeCompte, T; Lee, K; Liu, J B; Loken, J; Lukens, P; Madrak, R; Mazzanti, P; Miller, J S; Moore, E; Moulik, T; Murat, P; Nelson, C; Ngan, C Y; Nodulman, L; Ohmoto, T; Olsen, J; Paulini, M; Pescara, L; Piacentino, G; Pitts, K T; Pope, G; Popovic, M; Ptohos, F; Pukhov, O; Reichold, A; Robertson, W J; Safonov, A; Sakumoto, W K; Scribano, A; Segler, S; Semenov, A; Shah, T; Signorelli, G; Spinella, F; Spiropulu, M; Sumorok, K; Suzuki, T; Taylor, W; Tecchio, M; Tollefson, K; Tseng, J; Vilar, R; Wagner, R L; Wallace, N B; Walsh, A M; Wang, C; Wicklund, A B; Winer, B L; Wu, X; Zucchelli, S
Physical review letters, 2001-Apr-30, 20010430, Letnik: 86, Številka: 18Journal Article
We have measured the ratio of prompt production rates of the charmonium states chi(c1) and chi(c2) in 110 pb(-1) of pp collisions at sqrts = 1.8 TeV. The photon from their decay into J/psi(gamma) is reconstructed through conversion into e+e- pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections sigma(chi(c2))/sigma(chi(c1)) = 0.96+/-0.27(stat)+/-0.11(syst) for events with pT(J/psi) > 4.0 GeV/c, /eta(J/psi)/ < 0.6, and pT(gamma) > 1.0 GeV/c.
