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Observation of hard scattering in photoproduction at HERA

Derrick, M. et al. (1992) Observation of hard scattering in photoproduction at HERA. Physics Letters B, 297 (3-4). pp. 404-416. ISSN 0370-2693 (doi:10.1016/0370-2693(92)91280-M)

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Abstract

We report a study of electron proton collisions at very low Q2, corresponding to virtual photoproduction at centre of mass energies in the range 100–295 GeV. The distribution in transverse energy of the observed hadrons is much harder than can be explained by soft processes. Some of the events show back-to-back two-jet production at the rate and with the characteristics expected from hard two-body scattering. A subset of the two-jet events have energy in the electron direction consistent with that expected from the photon remnant in resolved photon processes.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):Doyle, Prof Anthony and Saxon, Prof David and Bussey, Dr Peter
Authors: Derrick, M., Krakauer, D., Magill, S., Musgrave, B., Repond, J., Sugano, K., Stanek, R., Talaga, R.L., Thron, J., Arzarello, F., Ayed, R., Barbagli, G., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Chiarini, M., Cifarelli, L., Cindolo, F., Ciralli, F., Contin, A., D'Auria, S., Del Papa, C., Frasconi, F., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Lin, Q., Lisowski, B., Maccarrone, G., Margotti, A., Massam, T., Nania, R., Nemoz, C., Palmonari, F., Sartorelli, G., Timellini, R., Zamora Garcia, Y., Zichichi, A., Bargende, A., Barreiro, F., Crittenden, J., Dabbous, H., Desch, K., Diekmann, B., Geerts, M., Geitz, G., Gutjahr, B., Hartmann, H., Hartmann, J., Haun, D., Heinloth, K., Hilger, E., Jakob, H.-P., Kramarczyk, S., Kückes, M., Mass, A., Mengel, S., Mollen, J., Müsch, H., Paul, E., Schattevoy, R., Schneider, B., Schneider, J.-L., Wedemeyer, R., Cassidy, A., Cussans, D.G., Dyce, N., Fawcett, H.F., Foster, B., Gilmore, R., Heath, G.P., Lancaster, M., Llewellyn, T.J., Malos, J., Morgado, C.J.S., Tapper, R.J., Wilson, S.S., Rau, R.R., Bernstein, A., Caldwell, A., Gialas, I., Parsons, J.A., Ritz, S., Sciulli, F., Straub, P.B., Wai, L., Yang, S., Barillari, T., Schioppa, M., Susinno, G., Burkot, W., Chwastowski, J., Dwuraźny, A., Eskreys, A., Nizioł, B., Jakubowski, Z., Piotrzkowski, K., Zachara, M., Zawiejski, L., Borzemski, P., Eskreys, K., Jeleń, K., Kisielewska, D., Kowalski, T., Kulka, J., Rulikowska-Zarȩbska, E., Suszycki, L., Zaja̧c, J., Kȩdzierski, T., Kotański, A., Przybycień, M., Bauerdick, L.A.T., Behrens, U., Bienlein, J.K., Coldewey, C., Dannemann, A., Dierks, K., Dorth, W., Drews, G., Erhard, P., Flasiński, M., Fleck, I., Fürtjes, A., Gläser, R., Göttlicher, P., Haas, T., Hagge, L., Hain, W., Hasell, D., Hultschig, H., Jahnen, G., Joos, P., Kasemann, M., Klanner, R., Koch, W., Kötz, U., Kowalski, H., Labs, J., Ladage, A., Löhr, B., Löwe, M., Lüke, D., Mainusch, J., Manczak, O., Momayezi, M., Nickel, S., Notz, D., Park, I., Pösnecker, K.-U., Rohde, M., Ros, E., Schneekloth, U., Schroeder, J., Schulz, W., Selonke, F., Tscheslog, E., Tsurugai, T., Turkot, F., Vogel, W., Woeniger, T., Wolf, G., Youngman, C., Grabosch, H.J., Leich, A., Meyer, A., Rethfeldt, C., Schlenstedt, S., Casalbuoni, R., De Curtis, S., Dominici, D., Francescato, A., Nuti, M., Pelfer, P., Anzivino, G., Casaccia, R., Laakso, I., De Pasquale, S., Qian, S., Votano, L., Bamberger, A., Freidhof, A., Poser, T., Söldner-Rembold, S., Theisen, G., Trefzger, T., Brook, N.H., Bussey, P.J., Doyle, A.T., Forbes, J.R., Jamieson, V.A., Raine, C., Saxon, D.H., Gloth, G., Holm, U., Kammerlocher, H., Krebs, B., Neumann, T., Wick, K., Hofmann, A., Kröger, W., Krüger, J., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Salomon, R., Seidman, A., Schott, W., Wiik, B.H., Zetsche, F., Bacon, T.C., Butterworth, I., Markou, C., McQuillan, D., Miller, D.B., Mobayyen, M.M., Prinias, A., Vorvolakos, A., Bienz, T., Kreutzmann, H., Mallik, U., McCliment, E., Roco, M., Wang, M.Z., Cloth, P., Filges, D., Chen, L., Imlay, R., Kartik, S., Kim, H.-J., McNeil, R.R., Metcalf, W., Cases, G., Hervás, L., Labarga, L., del Peso, J., Roldán, J., Terrón, J., de Trocóniz, J.F., Ikraiam, F., Mayer, J.K., Smith, G.R., Corriveau, F., Gilkinson, D.J., Hanna, D.S., Hung, L.W., Mitchell, J.W., Patel, P.M., Sinclair, L.E., Stairs, D.G., Ullmann, R., Bashindzhagyan, G.L., Ermolov, P.F., Golubkov, Y.A., Kuzmin, V.A., Kuznetsov, E.N., Savin, A.A., Voronin, A.G., Zotov, N.P., Bentvelsen, S., Dake, A., Engelen, J., de Jong, P., de Jong, S., de Kamps, M., Kooijman, P., Kruse, A., van der Lugt, H., O'Dell, V., Straver, J., Tenner, A., Tiecke, H., Uijterwaal, H., Vermeulen, J., Wiggers, L., de Wolf, E., van Woudenberg, R., Yoshida, R., Bylsma, B., Durkin, L.S., Li, C., Ling, T.Y., McLean, K.W., Murray, W.N., Park, S.K., Romanowski, T.A., Seidlein, R., Blair, G.A., Butterworth, J.M., Byrne, A., Cashmore, R.J., Cooper-Sarkar, A.M., Devenish, R.C.E., Gingrich, D.M., Hallam-Baker, P.M., Harnew, N., Khatri, T., Long, K.R., Luffman, P., McArthur, I., Morawitz, P., Nash, J., Smith, S.J.P., Roocroft, N.C., Wilson, F.F., Abbiendi, G., Brugnera, R., Carlin, R., Dal Corso, F., De Giorgi, M., Dosselli, U., Fanin, C., Gasparini, F., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Lim, J.N., Oh, B.Y., Whitmore, J., Bonori, M., Contino, U., D'Agostini, G., Guida, M., Iori, M., Mari, S., Marini, G., Mattioli, M., Monaldi, D., Nigro, A., Hart, J.C., McCubbin, N.A., Shah, T.P., Short, T.L., Barberis, E., Cartiglia, N., Heusch, C., Hubbard, B., Leslie, J., Ng, J.S.T., O'Shaughnessy, K., Sadrozinski, H.F., Seiden, A., Badura, E., Biltzinger, J., Chaves, H., Rost, M., Seifert, R.J., Walenta, A.H., Weihs, W., Zech, G., Dagan, S., Heifetz, R., Levy, A., Zer-Zion, D., Hasegawa, T., Hazumi, M., Ishii, T., Kasai, S., Kuze, M., Nagasawa, Y., Nakao, M., Okuno, H., Tokushuku, K., Watanabe, T., Yamada, S., Chiba, M., Hamatsu, R., Hirose, T., Kitamura, S., Nagayama, S., Nakamitsu, Y., Arneodo, M., Costa, M., Ferrero, M.I., Lamberti, L., Maselli, S., Peroni, C., Solano, A., Staiano, A., Dardo, M., Bailey, D.C., Bandyopadhyay, D., Benard, F., Bhadra, S., Brkic, M., Burow, B.D., Chlebana, F.S., Crombie, M.B., Hartner, G.F., Levman, G.M., Martin, J.F., Orr, R.S., Prentice, J.D., Sampson, C.R., Stairs, G.G., Teuscher, R.J., Yoon, T.-S., Bullock, F.W., Catterall, C.D., Giddings, J.C., Jones, T.W., Khan, A.M., Lane, J.B., Makkar, P.L., Shaw, D., Shulman, J., Blankenship, K., Kochocki, J., Lu, B., Mo, L.W., Charchuła, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyżanowski, M., Muchorowski, K., Nowak, R.J., Pawlak, J.M., Stojda, K., Stopczyński, A., Szwed, R., Tymieniecka, T., Walczak, R., Wróblewski, A.K., Zakrzewski, J.A., Żarnecki, A.F., Adamus, M., Abramowicz, H., Eisenberg, Y., Glasman, C., Karshon, U., Montag, A., Revel, D., Shapira, A., Ali, I., Behrens, B., Camerini, U., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Lomperski, M., Loveless, R.J., Nylander, P., Ptacek, M., Reeder, D.D., Smith, W.H., Silverstein, S., Frisken, W.R., Furutani, K.M., and Iga, Y.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics Letters B
Publisher:Elsevier BV
ISSN:0370-2693
Published Online:18 October 2002

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