Exclusive photoproduction of J/psi mesons at HERA

Chekanov, S. et al. (2002) Exclusive photoproduction of J/psi mesons at HERA. European Physical Journal C, 24(3), 345 -360. (doi: 10.1007/s10052-002-0953-7)

Abstract

The exclusive photoproduction of J/psi mesons, gammap → J/psip, has been studied in ep collisions with the ZEUS detector at HERA, in the kinematic range 20 lt W lt 290 GeV, where W is the photon-proton centre-of-mass energy. The J/psi mesons were reconstructed in the union and the electron decay channels using integrated luminosities of 38 pb(-1) and 55 pb(- 1), respectively. The helicity structure of J/psi production shows that the hypothesis of s-channel helicity conservation is satisfied within two standard deviations. The total cross section and the differential cross-section dsigma/dt, where t is the squared four-momentum transfer at the proton vertex, are presented as a function of W, for \t\ lt 1.8 GeV2. The t distribution exhibits an exponential shape with a slope parameter increasing logarithmically with W with a value b = 4.15 +/- 0.05(stat.)(-0.18)(+0.30)(syst.) GeV-2 at W = 90 GeV. The effective parameters of the Pomeron trajectory are alpha(P)(0) = 1.200 +/- 0.009(stat.)(-0.010)(+0.004) (syst.) and alpha(P)' = 0.115 +/- 0.018(stat.)(-0.015)(+0.008) (syst.) GeV-2.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Saxon, Professor David and Collins-Tooth, Dr Christopher and Bussey, Dr Peter and Doyle, Professor Anthony and Skillicorn, Professor Ian
• Authors: Chekanov, S., Krakauer, D., Magill, S., Musgrave, B., Pellegrino, A., Repond, J., Yoshida, R., Mattingly, M.C.K., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Romeo, G.C., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., de Pasquale, S., Giusti, P., Iacobucci, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Pesci, A., Sartorelli, G., Zichichi, A., Aghuzumtsyan, G., Bartsch, D., Brock, I., Crittenden, J., Goers, S., Hartmann, H., Hilger, E., Irrgang, P., Jakob, H.P., Kappes, A., Katz, U.F., Kerger, R., Kind, O., Paul, E., Rautenberg, J., Renner, R., Schnurbusch, H., Stifutkin, A., Tandler, J., Voss, K.C., Weber, A., Wessoleck, H., Bailey, D.S., Brook, N.H., Cole, J.E., Foster, B., Heath, G.P., Heath, H.F., Robins, S., Rodrigues, E., Scott, J., Tapper, R.J., Wing, M., Capua, M., Mastroberardino, A., Schioppa, M., Susinno, G., Kim, J.Y., Kim, Y.K., Lee, J.H., Lim, I.T., Pac, M.Y., Caldwell, A., Helbich, M., Liu, X., Mellado, B., Paganis, S., Schmidke, W.B., Sciulli, F., Chwastowski, J., Eskreys, A., Figiel, J., Olkiewicz, K., Przybycien, M.B., Stopa, P., Zawiejski, L., Bednarek, B., Grabowska-Bold, I., Jelen, K., Kisielewska, D., Kowal, A.M., Kowal, M., Kowalski, T., Mindur, B., Przybycien, M., Rulikowska-Zarebska, E., Suszycki, L., Szuba, D., Szuba, J., Kotanski, A., Slominski, W., Bauerdick, L.A.T., Behrens, U., Borras, K., Chiochia, V., Dannheim, D., Derrick, M., Desler, K., Drews, G., Fourletova, J., Fox-Murphy, A., Fricke, U., Geiser, A., Goebel, F., Gottlicher, P., Graciani, R., Haas, T., Hain, W., Hartner, G.F., Hillert, S., Kotz, U., Kowalski, H., Labes, H., Lelas, D., Lohr, B., Mankel, R., Martinez, M., Moritz, M., Notz, D., Petrucci, M.C., Polini, A., Schneekloth, U., Selonke, F., Surrow, B., Wichmann, R., Wolf, G., Youngman, C., Zeuner, W., Viani, A.L.D., Meyer, A., Schlenstedt, S., Barbagli, G., Gallo, E., Genta, C., Pelfer, P.G., Bamberger, A., Benen, A., Coppola, N., Markun, P., Raach, H., Wolfle, S., Bell, M., Bussey, P.J., Doyle, A.T., Glasman, C., Hanlon, S., Lee, S.W., Lupi, A., McCance, G.J., Saxon, D.H., Skillicorn, I.O., Bodmann, B., Holm, U., Salehi, H., Wick, K., Ziegler, A., Ziegler, A., Carli, T., Gialas, I., Klimek, K., Lohrmann, E., Milite, M., Stonjek, S., Collins-Tooth, C., Foudas, C., Goncalo, R., Long, K.R., Metlica, F., Miller, D.B., Tapper, A.D., Walker, R., Cloth, P., Filges, D., Kuze, M., Nagano, K., Tokushuku, K., Yamada, S., Yamazaki, Y., Barakbaev, A.N., Boos, E.G., Pokrovskiy, N.S., Zhautykov, B.O., Ahn, S.H., Lee, S.B., Park, S.K., Lim, H., Son, D., Barreiro, F., Garcia, G., Gonzalez, O., Labarga, L., del Peso, J., Redondo, I., Terron, J., Vazquez, M., Barbi, M., Bertolin, A., Corriveau, F., Ochs, A., Padhi, S., Stairs, D.G., St Laurent, M., Tsurugai, T., Antonov, A., Bashkirov, V., Danilov, P., Dolgoshein, B.A., Gladkov, D., Sosnovtsev, V., Suchkov, S., Dementiev, R.K., Ermolov, P.F., Golubkov, Y.A., Katkov, I.I., Khein, L.A., Korotkova, N.A., Korzhavina, I.A., Kuzmin, V.A., Levchenko, B.B., Lukina, O.Y., Proskuryakov, A.S., Shcheglova, L.M., Solomin, A.N., Vlasov, N.N., Zotkin, S.A., Bokel, C., Engelen, J., Grijpink, S., Koffeman, E., Kooijman, P., Maddox, E., Schagen, S., Tassi, E., Tiecke, H., Tuning, N., Velthuis, J.J., Wiggers, L., de Wolf, E., Brummer, N., Bylsma, B., Durkin, L.S., Gilmore, J., Ginsburg, C.M., and Kim, C.L.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: European Physical Journal C
• ISSN: 1434-6044