1. Photo-production of psi(2S) mesons at HERA
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Adloff, C, Aid, S, Anderson, M, Andreev, V, Andrieu, B, Arkadov, V, Arndt, C, Ayyaz, I, Babaev, A, Bahr, J, Ban, J, Baranov, P, Barrelet, E, Barschke, R, Bartel, W, Bassler, U, Beck, M, Behrend, HJ, Beier, C, Belousov, A, Berger, C, Bernardi, G, Bertrand-Coremans, G, Beyer, R, Biddulph, P, Bizot, JC, Borras, K, Boudry, V, Bourov, S, Braemer, A, Braunschweig, W, Brisson, V, Brown, DP, Bruckner, W, Bruel, P, Bruncko, D, Brune, C, Bruger, J, Busser, FW, Buniatian, A, Burke, S, Buschhorn, G, Calvet, D, Campbell, AJ, Carli, T, Charlet, M, Clarke, D, Clerbaux, B, Cocks, S, Contreras, JG, Cormack, C, Coughlan, JA, Cousinou, MC, Cox, BE, Cozzika, G, Cussans, DG, Cvach, J, Dagoret, S, Dainton, JB, Dau, WD, Daum, K, David, M, De Roeck, A, De Wolf, EA, Delcourt, B, Dirkmann, M, Dixon, P, Dlugosz, W, Donovan, KT, Dowell, JD, Droutskoi, A, Ebert, J, Ebert, TR, Eckerlin, G, Efremenko, V, Egli, S, Eichler, R, Eisele, F, Eisenhandler, E, Elsen, E, Erdmann, M, Fahr, AB, Favart, L, Fedotov, A, Felst, R, Feltesse, J, Ferencei, J, Ferrarotto, F, Flamm, K, Fleischer, M, Flieser, M, Flugge, G, Fomenko, A, Formanek, J, Foster, JM, Franke, G, Gabathuler, E, Gabathuler, K, Gaede, F, Garvey, J, Gayler, J, Gebauer, M, Gerhards, R, Glazov, A, Goerlich, L, Gogitidze, N, Goldberg, M, Gonzalez-Pineiro, B, Gorelov, I, Grab, C, Grassler, H, Greenshaw, T, Griffiths, RK, Grindhammer, G, Gruber, A, Gruber, C, Hadig, T, Haidt, D, Hajduk, L, Haller, T, Hampel, M, Haynes, WJ, Heinemann, B, Heinzelmann, G, Henderson, RCW, Hengstmann, S, Henschel, H, Heremans, R, Herynek, I, Hewitt, K, Hiller, KH, Hilton, CD, Hladky, J, Hoppner, M, Hoffmann, D, Holton, T, Horisberger, R, Hudgson, VL, Hutte, M, Ibbotson, M, Issever, C, Itterbeck, H, Jacquet, M, Jaffre, M, Janoth, J, Jansen, DM, Jonsson, L, Johnson, DP, Jung, H, Kalmus, PIP, Kander, M, Kant, D, Kathage, U, Katzy, J, Kaufmann, HH, Kaufmann, O, Kausch, M, Kazarian, S, Kenyon, IR, Kermiche, S, Keuker, C, Kiesling, C, Klein, M, Kleinwort, C, Knies, G, Kohne, JH, Kolanoski, H, Kolya, SD, Korbel, V, Kostka, P, Kotelnikov, SK, Kramerkamper, T, Krasny, MW, Krehbiel, H, Krucker, D, Kupper, A, Kuster, H, Kuhlen, M, Kurca, T, Laforge, B, Lahmann, R, Landon, MPJ, Lange, W, Langenegger, U, Lebedev, A, Lehner, F, Lemaitre, V, Levonian, S, Lindstroem, M, Lipinski, J, List, B, Lobo, G, Lopez, GC, Lubimov, V, Luke, D, Lytkin, L, Magnussen, N, Mahlke-Kruger, H, Malinovski, E, Maracek, R, Marage, P, Marks, J, Marshall, R, Martens, J, Martin, G, Martin, R, Martyn, HU, Martyniak, J, Maxfield, SJ, McMahon, SJ, Mehta, A, Meier, K, Merkel, P, Metlica, F, Meyer, A, Meyer, H, Meyer, J, Meyer, PO, Migliori, A, Mikocki, S, Milstead, D, Moeck, J, Moreau, F, Morris, JV, Mroczko, E, Muller, D, Muller, K, Murin, P, Nagovizin, V, Nahnhauer, R, Naroska, B, Naumann, T, Negri, I, Newman, PR, Newton, D, Nguyen, HK, Nicholls, TC, Niebergall, F, Niebuhr, C, Niedzballa, C, Niggli, H, Nowak, G, Nunnemann, T, Oberlack, H, Olsson, JE, Ozerov, D, Palmen, P, Panaro, E, Panitch, A, Pascaud, C, Passaggio, S, Patel, GD, Pawletta, H, Peppel, E, Perez, E, Phillips, JP, Pieuchot, A, Pitzl, D, Poschl, R, Pope, G, Povh, B, Rabbertz, K, Reimer, P, Rick, H, Riess, S, Rizvi, E, Robmann, P, Roosen, R, Rosenbauer, K, Rostovtsev, A, Rouse, F, Royon, C, Ruter, K, Rusakov, S, Rybicki, K, Sankey, DPC, Schacht, P, Scheins, J, Schiek, S, Schleif, S, von Schlippe, W, Schmidt, D, Schmidt, G, Schoeffel, L, Schoning, A, Schroder, V, Schuhmann, E, Schultz-Coulon, HC, Schwab, B, Sefkow, F, Semenov, A, Shekelyan, V, Sheviakov, I, Shtarkov, LN, Siegmon, G, Siewert, U, Sirois, Y, Skillicorn, IO, Sloan, T, Smirnov, P, Smith, M, Solochenko, V, Soloviev, Y, Specka, A, Spiekermann, J, Spielman, S, Spitzer, H, Squinabol, F, Steffen, P, Steinberg, R, Steinhart, J, Stella, B, Stellberger, A, Stiewe, J, Stolze, K, Straumann, U, Struczinski, W, Sutton, JP, Swart, M, Tapprogge, S, Tasevsky, M, Tchernyshov, V, Tchetchelnitski, S, Theissen, J, Thompson, G, Thompson, PD, Tobien, N, Todenhagen, R, Truol, P, Tsipolitis, G, Turnau, J, Tzamariudaki, E, Uelkes, P, Usik, A, Valkar, S, Valkarova, A, Vallee, C, Van Esch, P, Van Mechelen, P, Vandenplas, D, Vazdik, Y, Verrecchia, P, Villet, G, Wacker, K, Wagener, A, Wagener, M, Wallny, R, Walter, T, Waugh, B, Weber, G, Weber, M, Wegener, D, Wegner, A, Wengler, T, Werner, M, West, LR, Wiesand, S, Wilksen, T, Willard, S, Winde, M, Winter, GG, Wittek, C, Wobisch, M, Wollatz, H, Wunsch, E, Zacek, J, Zalesak, J, Zarbock, D, Zhang, Z, Zhokin, A, Zini, P, Zomer, F, Zsembery, J, ZurNedden, M, Collaboration, H, and H1 Collaboration
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Physics ,Nuclear and High Energy Physics ,Particle physics ,Muon ,Meson ,High Energy Physics::Experiment ,Electron ,HERA ,Nuclear Experiment ,Lepton - Abstract
Quasi-elastic (z > 0.95) photo-production of ψ(2S) mesons has been observed at HERA for photon-proton centre-of-mass energies in the range 40 to 160 GeV. The ψ(2S) mesons were identified through their decays to ℓ+ℓ- and to J/ψπ+π-, where the J/ψ subsequently decays to ℓ+ℓ-, the lepton ℓ being either a muon or an electron. The cross-section for quasi-elastic photoproduction was measured to be (18.0 ± 2.8(stat) ± 3.0(syst)) nb at a photon-proton centre-of-mass energy of 80 GeV. The ratio of the ψ(2S) to J/ψ quasi-elastic cross-sections is (0.150 ± 0.027(stat) + 0.022(syst)). © 1998 Elsevier Science B.V.
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- 1998