1. Measurement of Di-jet Cross-Sections in Photoproduction and Photon Structure
- Author
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Adloff, C., Andreev, V., Andrieu, B., Arkadov, V., Astvatsatourov, A., Ayyaz, I., Babaev, A., Bahr, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beglarian, A., Behnke, O., Beier, C., Belousov, A., Benisch, T., Berger, C., Bernardi, G., Berndt, T., Bertrand-Coremans, G., Bizot, J C., Borras, K., Boudry, V., Braunschweig, W., Brisson, V., Broker, H B., Brown, D P., Brckner, W., Bruel, P., Bruncko, D., Brger, J., Bsser, F W., Bunyatyan, A., Burke, S., Burkhardt, H., Burrage, A., Buschhorn, G., Campbell, A J., Cao, J., Carli, T., Caron, S., Chabert, E., Clarke, D., Clerbaux, B., Collard, C., Contreras, J G., Coughlan, J A., Cousinou, M C., Cox, B E., Cozzika, G., Cvach, J., Dainton, J B., Dau, W D., Daum, K., David, M., Davidsson, M., Delcourt, B., Delerue, N., Demirchyan, R., de Roeck, A., De Wolf, E A., Diaconu, C., Dixon, P., Dodonov, V., Donovan, K T., Dowell, J D., Droutskoi, A., Duprel, C., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellerbrock, M., Elsen, E., Erdmann, M., Faulkner, P J W., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Ferron, S., Fleischer, M., Flugge, G., Fomenko, A., Foresti, I., Formnek, J., Foster, J M., Franke, G., Gabathuler, E., Gabathuler, K., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Grlich, L., Gogitidze, N., Goldberg, M., Goodwin, C., Gorelov, I., Grab, C., Grssler, H., Greenshaw, T., Griffiths, R K., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Haustein, V., Haynes, W J., Heinemann, B., Heinzelmann, G., Henderson, R C W., Hengstmann, S., Henschel, H., Heremans, R., Herrera, G., Herynek, I., Hilgers, M., Hiller, K H., Hilton, C D., Hladky, J., Hoting, P., Hoffmann, D., Hoprich, W., Horisberger, R., Hurling, S., Ibbotson, M., Issever, C., Jacquet, M., Jaffr, M., Janauschek, L., Jansen, D M., Janssen, X., Jemanov, V., Jnsson, L B., Johnson, D P., Jones, M A S., Jung, H., Kastli, H K., Kant, D., Kapichine, M., Karlsson, M., Karschnick, O., Kaufmann, O., Kausch, M., Keil, F., Keller, N., Kennedy, J., Kenyon, I R., Kermiche, S., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Koblitz, B., Kolanoski, H., Kolya, S D., Korbel, V., Kostka, P., Kotelnikov, S K., Krasny, M W., Krehbiel, H., Kroseberg, J., Krucker, D., Krger, K., Kupper, A., Kuhr, T., Kurca, T., Kutuev, R., Lachnit, W., Lahmann, R., Lamb, D., Landon, M P J., Lange, W., Lastovicka, T., Lebedev, A., Leiner, B., Lematre, V., Lemrani, R., Lendermann, V., Levonian, S., Lindstrm, M., Lobo, G., Lobodzinska, E., Lobodzinski, B., Loktionova, N., Lubimov, V., Luders, S., Luke, D., Lytkin, L., Magnussen, N., Mahlke-Krger, H., Malden, N., Malinovskii, E., Malinovski, I., Maracek, R., Marage, P., Marks, J., Marshall, R., Martyn, H U., Martyniak, J., Maxfield, S J., McMahon, T R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P O., Mikocki, S., Milstead, D., Mkrtchyan, T., Mohr, R., Mohrdieck, S., Mondragon, M N., Moreau, F., Morozov, A., Morris, J V., Mller, D., Muller, K., Murn, P., Nagovizin, V., Naroska, B., Naumann, J., Naumann, T., Negri, I., Newman, P R., Nguyen, H K., Nicholls, T C., Niebergall, F., Niebuhr, C., Nix, O., Nowak, G., Nunnemann, T., Olsson, J E., Ozerov, D., Panassik, V., Pascaud, C., Passaggio, S., Patel, G D., Perez, E., Phillips, J P., Pitzl, D., Poschl, R., Potachnikova, I., Povh, B., Rabbertz, K., Rdel, G., Rauschenberger, J., Reimer, P., Reisert, B., Reyna, D., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rostovtsev, A., Royon, C., Rusakov, S., Rybicki, K., Sankey, D P C., Scheins, J., Schilling, F P., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schning, A., Schrner, T., Schroder, V., Schultz-Coulon, H C., Sedlak, K., Sefkow, F., Shekelian, V., Shevyakov, I., Shtarkov, L N., Siegmon, G., Sievers, P., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Solovev, Yu., Spaskov, V., Specka, A., Spitzer, H., Stamen, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Sutton, J P., Swart, M., Tasevsky, M., Chernyshov, V., Chechelnitskii, S., Thompson, G., Thompson, P D., Tobien, N., Traynor, D., Truol, P., Tsipolitis, G., Turnau, J., Turney, J E., Tzamariudaki, E., Udluft, S., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Van Mechelen, P., Vazdik, Ya., Villet, G., von Dombrowski, S., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L R., White, G., Wiesand, S., Wilksen, T., Winde, M., Winter, G G., Wissing, C., Wobisch, M., Wollatz, H., Wunsch, E., Zaicek, J., Zaleisak, J., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., zur Nedden, M., Adloff, C., Andreev, V., Andrieu, B., Arkadov, V., Astvatsatourov, A., Ayyaz, I., Babaev, A., Bahr, J., Baranov, P., Barrelet, E., Bartel, W., Bassler, U., Bate, P., Beglarian, A., Behnke, O., Beier, C., Belousov, A., Benisch, T., Berger, C., Bernardi, G., Berndt, T., Bertrand-Coremans, G., Bizot, J C., Borras, K., Boudry, V., Braunschweig, W., Brisson, V., Broker, H B., Brown, D P., Brckner, W., Bruel, P., Bruncko, D., Brger, J., Bsser, F W., Bunyatyan, A., Burke, S., Burkhardt, H., Burrage, A., Buschhorn, G., Campbell, A J., Cao, J., Carli, T., Caron, S., Chabert, E., Clarke, D., Clerbaux, B., Collard, C., Contreras, J G., Coughlan, J A., Cousinou, M C., Cox, B E., Cozzika, G., Cvach, J., Dainton, J B., Dau, W D., Daum, K., David, M., Davidsson, M., Delcourt, B., Delerue, N., Demirchyan, R., de Roeck, A., De Wolf, E A., Diaconu, C., Dixon, P., Dodonov, V., Donovan, K T., Dowell, J D., Droutskoi, A., Duprel, C., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellerbrock, M., Elsen, E., Erdmann, M., Faulkner, P J W., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Ferron, S., Fleischer, M., Flugge, G., Fomenko, A., Foresti, I., Formnek, J., Foster, J M., Franke, G., Gabathuler, E., Gabathuler, K., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Grlich, L., Gogitidze, N., Goldberg, M., Goodwin, C., Gorelov, I., Grab, C., Grssler, H., Greenshaw, T., Griffiths, R K., Grindhammer, G., Hadig, T., Haidt, D., Hajduk, L., Haustein, V., Haynes, W J., Heinemann, B., Heinzelmann, G., Henderson, R C W., Hengstmann, S., Henschel, H., Heremans, R., Herrera, G., Herynek, I., Hilgers, M., Hiller, K H., Hilton, C D., Hladky, J., Hoting, P., Hoffmann, D., Hoprich, W., Horisberger, R., Hurling, S., Ibbotson, M., Issever, C., Jacquet, M., Jaffr, M., Janauschek, L., Jansen, D M., Janssen, X., Jemanov, V., Jnsson, L B., Johnson, D P., Jones, M A S., Jung, H., Kastli, H K., Kant, D., Kapichine, M., Karlsson, M., Karschnick, O., Kaufmann, O., Kausch, M., Keil, F., Keller, N., Kennedy, J., Kenyon, I R., Kermiche, S., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Koblitz, B., Kolanoski, H., Kolya, S D., Korbel, V., Kostka, P., Kotelnikov, S K., Krasny, M W., Krehbiel, H., Kroseberg, J., Krucker, D., Krger, K., Kupper, A., Kuhr, T., Kurca, T., Kutuev, R., Lachnit, W., Lahmann, R., Lamb, D., Landon, M P J., Lange, W., Lastovicka, T., Lebedev, A., Leiner, B., Lematre, V., Lemrani, R., Lendermann, V., Levonian, S., Lindstrm, M., Lobo, G., Lobodzinska, E., Lobodzinski, B., Loktionova, N., Lubimov, V., Luders, S., Luke, D., Lytkin, L., Magnussen, N., Mahlke-Krger, H., Malden, N., Malinovskii, E., Malinovski, I., Maracek, R., Marage, P., Marks, J., Marshall, R., Martyn, H U., Martyniak, J., Maxfield, S J., McMahon, T R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P O., Mikocki, S., Milstead, D., Mkrtchyan, T., Mohr, R., Mohrdieck, S., Mondragon, M N., Moreau, F., Morozov, A., Morris, J V., Mller, D., Muller, K., Murn, P., Nagovizin, V., Naroska, B., Naumann, J., Naumann, T., Negri, I., Newman, P R., Nguyen, H K., Nicholls, T C., Niebergall, F., Niebuhr, C., Nix, O., Nowak, G., Nunnemann, T., Olsson, J E., Ozerov, D., Panassik, V., Pascaud, C., Passaggio, S., Patel, G D., Perez, E., Phillips, J P., Pitzl, D., Poschl, R., Potachnikova, I., Povh, B., Rabbertz, K., Rdel, G., Rauschenberger, J., Reimer, P., Reisert, B., Reyna, D., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rostovtsev, A., Royon, C., Rusakov, S., Rybicki, K., Sankey, D P C., Scheins, J., Schilling, F P., Schleif, S., Schleper, P., Schmidt, D., Schoeffel, L., Schning, A., Schrner, T., Schroder, V., Schultz-Coulon, H C., Sedlak, K., Sefkow, F., Shekelian, V., Shevyakov, I., Shtarkov, L N., Siegmon, G., Sievers, P., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Solovev, Yu., Spaskov, V., Specka, A., Spitzer, H., Stamen, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Straumann, U., Struczinski, W., Sutton, J P., Swart, M., Tasevsky, M., Chernyshov, V., Chechelnitskii, S., Thompson, G., Thompson, P D., Tobien, N., Traynor, D., Truol, P., Tsipolitis, G., Turnau, J., Turney, J E., Tzamariudaki, E., Udluft, S., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Van Mechelen, P., Vazdik, Ya., Villet, G., von Dombrowski, S., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L R., White, G., Wiesand, S., Wilksen, T., Winde, M., Winter, G G., Wissing, C., Wobisch, M., Wollatz, H., Wunsch, E., Zaicek, J., Zaleisak, J., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., and zur Nedden, M.
- Abstract
The production of hard di-jet events in photoproduction at HERA is dominatedby resolved photon processes in which a parton in the photon with momentumfraction x_gamma is scattered from a parton in the proton. These processes aresensitive to the quark and gluon content of the photon. The differential di-jetcross-section dsigma/dlog(x_gamma) is presented here, measured in taggedphotoproduction at HERA using data taken with the H1 detector, corresponding toan integrated luminosity of 7.2 pb^(-1). Using a restricted data sample at hightransverse jet energy, E_(T,jet) 6 GeV, the effective parton densityf_gamma,eff(x_gamma) = [q(x_gamma) + bar(q)(x_gamma) +9/4g(x_gamma)] in thephoton in leading order QCD is measured down to x_gamma=0.05 from which thegluon density in the photon is derived.