1. Measurements of inelastic J / psi and psi-prime photoproduction at HERA
- Author
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Chekanov, S., Krakauer, D., Magill, S., Musgrave, B., Repond, J., Yoshida, R., Mattingly, M. C. K., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Cara Romeo, G., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., De Pasquale, S., Giusti, P., Iacobucci, G., Margotti, A., Nania, R., Palmonari, F., Pesci, A., Sartorelli, G., Zichichi, A., Aghuzumtsyan, G., Bartsch, D., Brock, I., Goers, S., Hartmann, H., Hilger, E., Irrgang, P., Jakob, H. P., Kappes, A., Katz, U. F., Kind, O., Paul, E., Rautenberg, J., Renner, R., Schnurbusch, H., Stifutkin, A., Tandler, J., Voss, K. C., Wang, M., Weber, A., Bailey, D. S., Brook, N. H., Cole, J. E., Foster, B., Heath, G. P., Heath, Helen 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., Ning, Y., Paganis, S., Ren, Z., Schmidke, W. B., Sciulli, F., Chwastowski, J., Eskreys, A., Figiel, J., Olkiewicz, K., Stopa, P., Zawiejski, L., Adamczyk, L., Bold, T., Grabowska-Bold, I., Kisielewska, D., Kowal, A. M., Kowal, M., Kowalski, T., Przybycien, M., Suszycki, L., Szuba, D., Szuba, J., Kotanski, A., Slominski, W., Bauerdick, L. A. T., Behrens, U., Bloch, I., Borras, K., Chiochia, V., Dannheim, D., Derrick, M., Drews, G., Fourletova, J., Fox-Murphy, A., Fricke, U., Geiser, A., Goebel, F., Gottlicher, P., Gutsche, O., Haas, Tobias M., Hain, W., Hartner, G. F., Hillert, S., Kotz, U., Kowalski, H., Kramberger, G., Labes, H., Lelas, D., Lohr, B., Mankel, R., Melzer-Pellmann, I. A., Moritz, M., Notz, D., Petrucci, M. C., Polini, A., Raval, Amita, Schneekloth, U., Selonke, F., Wessoleck, H., Wichmann, R., Wolf, G., Youngman, C., Zeuner, W., Lopez-Duran-Viani, Amaya, Meyer, A., Schlenstedt, S., Barbagli, G., Gallo, E., Genta, C., Pelfer, P. G., Bamberger, A., Benen, A., Coppola, N., 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., Gialas, I., Bodmann, B., Carli, T., Holm, U., Klimek, K., Krumnack, N., Lohrmann, E., Milite, M., Salehi, H., Stonjek, S., Wick, K., Ziegler, A., Ziegler, Ar., Collins-Tooth, C., Foudas, C., Goncalo, R., Long, K. R., Metlica, F., Tapper, A. D., 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., Lim, H., Son, D., Barreiro, F., Gonzalez, O., Labarga, L., del Peso, J., Redondo, I., Tassi, E., Terron, J., Vazquez Acosta, Monica Luisa, Barbi, M., Bertolin, A., Corriveau, F., Ochs, A., Padhi, S., Stairs, D. G., St. Laurent, M., Tsurugai, T., Antonov, A., Danilov, P., Dolgoshein, B. A., Gladkov, D., Sosnovtsev, V., Suchkov, S., Dementiev, R. K., Ermolov, P. F., Golubkov, Yu. A., Katkov, I. I., Khein, L. A., Korzhavina, I. A., Kuzmin, V. A., Levchenko, B. B., Lukina, O. Yu., Proskuryakov, A. S., Shcheglova, L. M., Vlasov, N. N., Zotkin, S. A., Bokel, C., Engelen, J., Grijpink, S., Koffeman, E., Kooijman, P., Maddox, E., Pellegrino, A., Schagen, S., Tiecke, H., Tuning, N., Velthuis, J. J., Wiggers, L., de Wolf, E., Brummer, N., Bylsma, B., Durkin, L. S., Ling, T. Y., Boogert, S., Cooper-Sarkar, Amanda M., Devenish, R. C. E., Ferrando, J., Grzelak, G., Matsushita, T., Rigby, M., Ruske, O., Sutton, M. R., Walczak, R., Brugnera, R., Carlin, R., Dal Corso, F., Dusini, S., Garfagnini, A., Limentani, S., Longhin, A., Parenti, A., Posocco, M., Stanco, L., Turcato, M., Heaphy, E. A., Oh, B. Y., Saull, P. R. B., Whitmore, J. J., Iga, Y., D'Agostini, G., Marini, G., Nigro, A., Cormack, C., Hart, J. C., McCubbin, N. A., Heusch, C., Park, I. H., Pavel, N., Abramowicz, H., Gabareen, A., Kananov, S., Kreisel, A., Levy, A., Abe, T., Fusayasu, T., Kagawa, S., Kohno, T., Tawara, T., Yamashita, T., Hamatsu, R., Hirose, T., Inuzuka, M., Kitamura, S., Matsuzawa, K., Nishimura, T., Arneodo, M., Ferrero, M. I., Monaco, V., Ruspa, M., Sacchi, R., Solano, A., Galea, R., Koop, T., Levman, G. M., Martin, J. F., Mirea, A., Sabetfakhri, A., Butterworth, J. M., Gwenlan, C., Hall-Wilton, R., Jones, T. W., Lightwood, M. S., Loizides, J. H., West, B. J., Ciborowski, J., Ciesielski, R., Nowak, R. J., Pawlak, J. M., Smalska, B., Sztuk, J., Tymieniecka, T., Ukleja, A., Ukleja, J., Zarnecki, A. F., Adamus, M., Plucinski, P., Eisenberg, Y., Gladilin, L. K., Hochman, D., Karshon, U., Kcira, D., Lammers, S., Li, L., Reeder, D. D., Savin, A. A., Smith, W. H., Deshpande, A., Dhawan, S., Hughes, V. W., Straub, P. B., Bhadra, S., Catterall, C. D., Fourletov, S., Menary, S., Soares, M., Standage, J., and ZEUS Collaboration
- Subjects
perturbation theory [quantum chromodynamics] ,color: octet ,leptonic decay [psi mesons] ,approx. 300 GeV-cms ,J/psi(3100): helicity ,transverse momentum dependence ,photoproduction [psi(3685)] ,energy dependence ,psi mesons: leptonic decay ,photoproduction [J/psi(3100)] ,helicity [J/psi(3100)] ,J/psi(3100): photoproduction ,positron p: inelastic scattering ,inelastic scattering [positron p] ,ddc:530 ,angular distribution ,photon: resolved ,quantum chromodynamics: perturbation theory ,ratio [channel cross section] ,tables ,psi(3685): photoproduction ,octet [color] ,resolved [photon] ,singlet [color] ,ZEUS ,positron p: colliding beams ,colliding beams [positron p] ,DESY HERA Stor ,color: singlet ,channel cross section: ratio ,experimental results - Abstract
38 pp. (2003)., The cross sections for inelastic photoproduction of J/psi and psi' mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 38.0 pb-1. The events were required to have 0.1 < z < 0.9 and 50 < W < 180 GeV, where z is the fraction of the incident photon energy carried by the J/psi in the proton rest frame and W is the photon-proton centre-of-mass energy. The psi' to J/psi cross-section ratio was measured in the range 0.55 < z < 0.9. The J/psi data, for various ranges of transverse momentum, are compared to theoretical models incorporating colour-singlet and colour-octet matrix elements. Predictions of a next-to-leading-order colour-singlet model give a good description of the data, although there is a large normalisation uncertainty. The J/psi helicity distribution for z > 0.4 is compared to leading-order QCD predictions.
- Published
- 2003
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