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1. Bose-Einstein correlations in deep inelastic $ep$ scattering at HERA

Author: Adloff, C., Aid, S., Anderson, M., Andreev, V., Andrieu, B., Arkadov, V., Arndt, C., Ayyaz, I., Babaev, A., Bähr, J., Bán, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Bassler, U., Beck, H. P., Beck, M., Behrend, H. -J, Belousov, A., Berger, Ch, Bernardi, G., Bertrand-Coremans, G., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Boiras, K., Botterweck, F., Boudry, V., Bourov, S., Braemer, A., Braunschweig, W., Brisson, V., Brückner, W., Bruel, P., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Bürger, J., Büsser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Calvet, D., Campbell, A. J., Carli, T., Charlet, M., Clarke, D., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., Cousinou, M. -C, Cox, B. E., Cozzika, G., Cussans, D. G., Cvach, J., Dagoret, S., Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Roeck, A., Wolf, E. A., Delcourt, B., Dirkmann, M., Dixon, P., Dlugosz, W., Dollfus, C., Donovan, K. T., Dowell, J. D., Dreis, H. B., Droutskoi, A., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Erdmann, M., Fahr, A. B., Favart, L., Fedotov, A., Feist, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flügge, G., Fomenko, A., Formánek, J., Foster, J. M., Franke, G., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Genzel, H., Gerhards, R., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Krzysztof Golec-Biernat, Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grässler, H., Greenshaw, T., Griffiths, R. K., Grindhammer, G., Gruber, A., Gruber, C., Hadig, T., Haidt, D., Hajduk, L., Haller, T., Hampel, M., Haynes, W. J., Heinemann, B., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herynek, I., Hess, M. F., Hewitt, K., Hiller, K. H., Hilton, C. D., Hladký, J., Höppner, M., Hoffmann, D., Holtom, T., Horisberger, R., Hudgson, V. L., Hütte, M., Ibbotson, M., Işsever, Ç, Itterbeck, H., Jacholkowska, A., Jacobsson, C., Jacquet, M., Jaffre, M., Janoth, J., Jansen, D. M., Jönsson, L., Johnson, D. P., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kathage, U., Katzy, J., Kaufmann, H. H., Kaufmann, O., Kausch, M., Kazarian, S., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Köhler, T., Könne, J. H., Kolanoski, H., Kolya, S. D., Korbel, V., Kostka, P., Kotelnikov, S. K., Krämerkämper, T., Krasny, M. W., Krehbiel, H., Krücker, D., Küpper, A., Küster, H., Kuhlen, M., Kurča, T., Kurzhöfer, J., Laforge, B., Landon, M. P. J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Levonian, S., Lindstroem, M., Linsel, F., Lipinski, J., List, B., Lobo, G., Lomas, J. W., Lopez, G. C., Lubimov, V., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malinovski, E., Maraček, R., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, G., Martin, R., Martyn, H. -U, Martyniak, J., Mavroidis, T., Maxfield, S. J., Mcmahon, S. J., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P. -O, Migliori, A., Mikocki, S., Milstead, D., Moeck, J., Moreau, F., Morris, J. V., Mroczko, E., Müller, D., Walter, T., Müller, K., Murín, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, Th, Négri, I., Newman, P. R., Newton, D., Nguyen, H. K., Nicholls, T. C., Niebergall, F., Niebuhr, C., Niedzballa, Ch, Niggli, H., Nowak, G., Nunnemann, T., Nyberg-Werther, M., Oberlack, H., Olsson, J. E., Ozerov, D., Palmen, P., Panaro, E., Panitch, A., Pascaud, C., Passaggio, S., Patel, G. D., Pawletta, H., Peppel, E., Perez, E., Phillips, J. P., Pieuchot, A., Pitzl, D., Pöschl, R., Pope, G., Povh, B., Prell, S., Rabbertz, K., Rädel, G., Riedlberger, J., Reimer, P., Rick, H., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Rüter, K., Rusakov, S., Rybicki, K., Sankey, D. P. C., Schacht, P., Schiek, S., Schleif, S., Schleper, P., Schlippe, W., Schmidt, D., Schmidt, G., Schoeffel, L., Schöning, A., Schröder, V., Schuhmann, E., Schwab, B., Sefkow, F., Semenov, A., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., 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., Stier, J., Stiewe, J., Stößlein, U., Stolze, K., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Theissen, J., Thompson, G., Thompson, P. D., Tobien, N., Todenhagen, R., Truöl, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Uelkes, P., Usik, A., Valkár, S., Valkárová, A., Vallée, C., Esch, P., Mechelen, P., Vandenplas, D., Vazdik, Y., Verrecchia, P., Villet, G., Wacker, K., Wagener, A., Wagener, M., Wallny, R., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L. R., Wiesand, S., Wilksen, T., Willard, S., Winde, M., Winter, G. -G, Wittek, C., Wobisch, M., Wollatz, H., Wünsch, E., Žáček, J., Zarbock, D., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., Zur Nedden, M., Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Scattering, FOS: Physical sciences, Bose–Einstein correlations, HERA, Inelastic scattering, 01 natural sciences, Charged particle, High Energy Physics - Experiment, Hadronization, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics
Abstract: Two-particle correlations in invariant mass are studied separately for like-sign and unlike-sign charged particles produced in deep inelastic positron-proton scattering in a new kinematical domain. The data were taken with the H1 detector at the HERA storage ring in 1994, in which 27.5 GeV positrons collided with 820 GeV protons at a centre of mass energy sqrt{s}=300 GeV. The observed enhancement of the like-sign correlations at low invariant masses is related to the dimensions of the hadronic source. The data are compared to different QCD models where the hadronization is performed with the string-fragmentation model. Results are presented for the first time separately for diffractive and non-diffractive scattering, in domains of four-momentum transfer, Bjorken-x, and hadronic center of mass energy, and in intervals of charged particle multiplicity. The observed source radii do not differ strongly from those measured in lower energy lepton-nucleon inelastic scattering, and e^+e^- annihilation., 36 pages, 10 Figures
Published: 1997

2. Hadron Production in Diffractive Deep-Inelastic Scattering

Author: Adloff, C., Aid, S., Anderson, M., Andreev, V., Andrieu, B., Arkadov, V., Arndt, C., Ayyaz, I., Babaev, A., Bähr, J., Bán, J., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Bassler, U., Bate, P., Beck, M., Beglarian, A., Behrend, H. -J, Beier, C., Belousov, A., Berger, C., Bernardi, G., Bertrand-Coremans, G., Beyer, R., Biddulph, P., Bizot, J. C., Borras, K., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Brown, D. P., Brückner, W., Bruel, P., Bruncko, D., Brune, C., Bürger, J., Büsser, F. W., Buniatian, A., Burke, S., Buschhorn, G., Calvet, D., Campbell, A. J., Carli, T., Chabert, E., Charlet, M., Clarke, D., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Cousinou, M. -C, Cox, B. E., Cozzika, G., Cvach, J., Dainton, J. B., Dau, W. D., Daum, K., David, M., Roeck, A., Wolf, E. A., Delcourt, B., Diaconu, C., Dirkmann, M., Dixon, P., Dlugosz, W., Donovan, K. T., Dowell, J. D., Droutskoi, A., Ebert, J., Eckerlin, G., Eckstein, D., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Enzenberger, M., Erdmann, M., Fahr, A. B., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flügge, G., Fomenko, A., Formánek, J., Foster, J. M., Franke, G., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gerhards, R., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Gorelov, I., Grab, C., Grässler, H., Greenshaw, T., Griffiths, R. K., Grindhammer, G., Gruber, C., Hadig, T., Haidt, D., Hajduk, L., Haller, T., Hampel, M., Haustein, V., Haynes, W. J., Heinemann, B., Heinzelmann, G., Henderson, R. C. W., Hengstmann, S., Henschel, H., Heremans, R., Herynek, I., Hewitt, K., Hiller, K. H., Hilton, C. D., Hladký, J., Höppner, M., Hoffmann, D., Holtom, T., Horisberger, R., Hudgson, V. L., Hütte, M., Ibbotson, M., Işever, C., Itterbeck, H., Jacquet, M., Jaffre, M., Janoth, J., Jansen, D. M., Jönsson, L., Johnson, D. P., Jung, H., Kander, M., Kant, D., Kathage, U., Katzy, J., Kaufmann, H. H., Kaufmann, O., Kausch, M., Kazarian, S., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Köhne, J. H., Kolanoski, H., Kolya, S. D., Korbel, V., Kostka, P., Kotelnikov, S. K., Krämerkämper, T., Krasny, M. W., Krehbiel, H., Krücker, D., Küpper, A., Küster, H., Kuhlen, M., Kurča, T., Laforge, B., Lahmann, R., Landon, M. P. J., Lange, W., Langenegger, U., Lebedev, A., Lehmann, M., Lehner, F., Lemaitre, V., Levonian, S., Lindstroem, M., Lipinski, J., List, B., Lobo, G., Lubimov, V., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malinovski, E., Maraček, R., Marage, P., Marks, J., Marshall, R., Martin, G., Martin, R., Martyn, H. -U, Martyniak, J., Maxfield, S. J., Mcmahon, S. J., Mcmahon, T. R., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P. -O, Migliori, A., Mikocki, S., Milstead, D., Moeck, J., Mohr, R., Mohrdieck, S., Moreau, F., Morris, J. V., Mroczko, E., Müller, D., Müller, K., Murín, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, T., Négri, I., Newman, P. R., Newton, D., Nguyen, H. K., Nicholls, T. C., Niebergall, F., Niebuhr, C., Niedzballa, C., Niggli, H., Nix, O., Nowak, G., Nunnemann, T., Oberlack, H., Olsson, J. E., Ozerov, D., Palmen, P., Panaro, E., Panitch, A., Pascaud, C., Passaggio, S., Patel, G. D., Pawletta, H., Peppel, E., Perez, E., Phillips, J. P., Pieuchot, A., Pitzl, D., Pöschl, R., Pope, G., Povh, B., Rabbertz, K., Reimer, P., Reisert, B., Rick, H., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Rusakov, S., Rybicki, K., Sankey, D. P. C., Schacht, P., Scheins, J., Schiek, S., Schleif, S., Schleper, P., Schlippe, W., Schmidt, D., Schmidt, G., Schoeffel, L., Schöning, A., Schröder, V., Schultz-Coulon, H. -C, Schwab, B., Sefkow, F., Semenov, A., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., Specka, A., Spiekermann, J., Spitzer, H., Squinabol, F., Steffen, P., Steinberg, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Stolze, K., Straumann, U., Struczinski, W., Sutton, J. P., Swart, M., Tapprogge, S., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Theissen, J., Thompson, G., Thompson, P. D., Tobien, N., Todenhagen, R., Truöl, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Udluft, S., Usik, A., Valkár, S., Alice Valkárová, Vallée, C., Esch, P., Mechelen, P., Vazdik, Y., Villet, G., Wacker, K., Wallny, R., Walter, T., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L. R., Wiesand, S., Wilksen, T., Willard, S., Winde, M., Winter, G. -G, Wittek, C., Wittmann, E., Wobisch, M., Wollatz, H., Wünsch, E., Žáček, J., Zálešák, J., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., Zurnedden, M., Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Levy, Jean-Michel, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and H1 Collaboration
Subjects: Nuclear and High Energy Physics, Particle physics, Photon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Hadron, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), symbols.namesake, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Feynman diagram, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, HERA, Deep inelastic scattering, Charged particle, Gluon, symbols, High Energy Physics::Experiment
Abstract: Characteristics of hadron production in diffractive deep-inelastic positron-proton scattering are studied using data collected in 1994 by the H1 experiment at HERA. The following distributions are measured in the centre-of-mass frame of the photon dissociation system: the hadronic energy flow, the Feynman-x (x_F) variable for charged particles, the squared transverse momentum of charged particles (p_T^{*2}), and the mean p_T^{*2} as a function of x_F. These distributions are compared with results in the gamma^* p centre-of-mass frame from inclusive deep-inelastic scattering in the fixed-target experiment EMC, and also with the predictions of several Monte Carlo calculations. The data are consistent with a picture in which the partonic structure of the diffractive exchange is dominated at low Q^2 by hard gluons., 16 pages, 6 figures, submitted to Phys. Lett. B
Published: 1998

3. Evolution of ep Fragmentation and Multiplicity Distributions in the Breit Frame

Author: Adloff, C., Aid, S., Anderson, M., Andreev, V., Andrieu, B., Arkadov, V., Arndt, C., Ayyaz, I., Babaev, A., Bähr, J., Bán, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Bassler, U., Beck, H. P., Beck, M., Behrend, H. -J, Belousov, A., Berger, C., Bernardi, G., Bertrand-Coremans, G., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Borras, K., Botterweck, F., Boudry, V., Bourov, S., Braemer, A., Braunschweig, W., Brisson, V., Brückner, W., Bruel, P., Bruncko, D., Brune, C., Buchholz, R., Büngener, L., Bürger, J., Büsser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Calvet, D., Campbell, A. J., Carli, T., Charlet, M., Clarke, D., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., Cousinou, M. -C, Cox, B. E., Cozzika, G., Cussans, D. G., Cvach, J., Dagoret, S., Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Roeck, A., Wolf, E. A., Delcourt, B., Dirkmann, M., Dixon, P., Dlugosz, W., Dollfus, C., Donovan, K. T., Dowell, J. D., Dreis, H. B., Droutskoi, A., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Erdmann, M., Fahr, A. B., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flügge, G., Fomenko, A., Formánek, J., Foster, J. M., Franke, G., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gerhards, R., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grässier, H., Greenshaw, T., Griffiths, R. K., Grindhammer, G., Gruber, A., Gruber, C., Hadig, T., Haidt, D., Hajduk, L., Haller, T., Hampel, M., Haynes, W. J., Heinemann, B., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herynek, I., Hess, M. F., Hewitt, K., Hiller, K. H., Hilton, C. D., Hladký, J., Höppner, M., Hoffmann, D., Holtom, T., Horisberger, R., Hudgson, V. L., Hütte, M., Ibbotson, M., Işsever, C., Itterbeck, H., Jacholkowska, A., Jacobsson, C., Jacquet, M., Jaffre, M., Janoth, J., Jansen, D. M., Jönsson, L., Johnson, D. R., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kathage, U., Katzy, J., Kaufmann, H. H., Kaufmann, O., Kausch, M., Kazarian, S., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Köhler, T., Köhne, J. H., Kolanoski, H., Kolya, S. D., Korbel, V., Kostka, P., Kotelnikov, S. K., Krämerkämper, T., Krasny, M. W., Krehbiel, H., Krücker, D., Küpper, A., Küster, H., Kuhlen, M., Kurča, T., Kurzhöfer, J., Laforge, B., Landon, M. P. J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Levonian, S., Lindstroem, M., Linsel, F., Lipinski, J., List, B., Lobo, G., Lomas, J. W., Lopez, G. C., Lubimov, V., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Krüger, H., Malinovski, E., Maraček, R., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, G., Martin, R., Martyn, H. -U, Martyniak, J., Mavroidis, T., Maxfield, S. J., Mcmahon, S. J., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P. -O, Migliori, A., Mikocki, S., Milstead, D., Moeck, J., Moreau, F., Morris, J. V., Mroczko, E., Müller, D., Walter, T., Müller, K., Murín, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, T., Négri, I., Newman, P. R., Newton, D., Nguyen, H. K., Nicholls, T. C., Niebergall, F., Niebuhr, C., Niedzballa, C., Niggli, H., Nowak, G., Nunnemann, T., Nyberg-Werther, M., Oberlack, H., Olsson, J. E., Ozerov, D., Palmen, P., Panaro, E., Panitch, A., Pascaud, C., Passaggio, S., Patel, G. D., Pawletta, H., Peppel, E., Perez, E., Phillips, J. P., Pieuchot, A., Pitzl, D., Pöschl, R., Pope, G., Povh, B., Prell, S., Rabbertz, K., Reimer, P., Rick, H., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Rüter, K., Rusakov, S., Rybicki, K., Sankey, D. P. C., Schacht, P., Schiek, S., Schleif, S., Schleper, P., Schlippe, W., Schmidt, D., Schmidt, G., Schoeffel, L., Schöning, A., Schröder, V., Schuhmann, E., Schwab, B., Sefkow, F., Semenov, A., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., 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., Stier, J., Stiewe, J., Stößlein, U., Stolze, K., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Theissen, J., Thompson, G., Thompson, P. D., Tobien, N., Todenhagen, R., Truöl, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Uelkes, P., Usik, A., Valkár, S., Alice Valkárová, Vallée, C., Esch, P., Mechelen, P., Vandenplas, D., Vazdik, Y., Verrecchia, P., Villet, G., Wacker, K., Wagener, A., Wagener, M., Wallny, R., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L. R., Wiesand, S., Wilksen, T., Willard, S., Winde, M., Winter, G. -G, Wittek, C., Wobisch, M., Wollatz, H., Wünsch, E., Žáček, J., Zarbock, D., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., Zurnedden, M., Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Levy, Jean-Michel
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Scattering, FOS: Physical sciences, HERA, 16. Peace & justice, 01 natural sciences, Frame of reference, Spectral line, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Fragmentation (mass spectrometry), 0103 physical sciences, Fragmentation function, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], lcsh:QC770-798, High Energy Physics::Experiment, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Multiplicity (chemistry), 010306 general physics, Scaling
Abstract: Low x deep-inelastic ep scattering data, taken in 1994 at the H1 detector at HERA, are analysed in the Breit frame of reference. The evolution of the peak and width of the current hemisphere fragmentation function is presented as a function of Q and compared with e+e- results at equivalent centre of mass energies. Differences between the average charged multiplicity and the multiplicity of e+e- annihilations at low energies are analysed. Invariant energy spectra are compared with MLLA predictions. Distributions of multiplicity are presented as functions of Bjorken-x and Q^2, and KNO scaling is discussed., Comment: 24 pages, 9 Figures, figure 2 corrected
Published: 1997

4. Measurement of Event Shape Variables in Deep Inelastic $e^{+}p$ Scattering

Author: 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, H. P., Beck, M., Behrend, H. J., Belousov, A., Berger, C., Bernardi, G., Bertrand-Coremans, G., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Borras, K., Botterweck, F., Boudry, V., Bourov, S., Braemer, A., Braunschweig, W., Brisson, V., Brown, D. P., Bruckner, W., Pascal Bruel, Bruncko, D., Brune, C., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Calvet, D., Campbell, A. J., Carli, T., Charlet, M., Clarke, D., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Cousinou, M. C., Cox, B. E., Cozzika, G., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Roeck, A., Wolf, E. A., Delcourt, B., Dirkmann, M., Dixon, P., Dlugosz, W., Dollfus, C., Donovan, K. T., Dowell, J. D., Dreis, H. B., Droutskoi, A., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Erdmann, M., Fahr, A. B., 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, J. M., 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, R. K., Grindhammer, G., Gruber, A., Gruber, C., Hadig, T., Haidt, D., Hajduk, L., Haller, T., Hampel, M., Haynes, W. J., Heinemann, B., Heinzelmann, G., Henderson, R. C. W., Hengstmann, S., Henschel, H., Herynek, I., Hess, M. F., Hewitt, K., Hiller, K. H., Hilton, C. D., Hladky, J., Hoppner, M., Hoffmann, D., Holtom, T., Horisberger, R., Hudgson, V. L., Hutte, M., Ibbotson, M., Issever, C., Itterbeck, H., Jacquet, M., Jaffre, M., Janoth, J., Jansen, D. M., Jonsson, L., Johnson, D. P., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kathage, U., Katzy, J., Kaufmann, H. H., Kaufmann, O., Kausch, M., Kazarian, S., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Kohler, T., Kohne, J. H., Kolanoski, H., Kolya, S. D., Korbel, V., Kostka, P., Kotelnikov, S. K., Kramerkamper, T., Krasny, M. W., Krehbiel, H., Krucker, D., Kupper, A., Kuster, H., Kuhlen, M., Kurca, T., Laforge, B., Landon, M. P. J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Levonian, S., Lindstrom, M., Linsel, F., Lipinski, J., List, B., Lobo, G., Lopez, G. C., Lubimov, V., Luke, D., Lytkin, L., Magnussen, N., Mahlke-Kruger, H., Malinovskii, E., Maracek, R., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, G., Roland Martin, Martyn, H. U., Martyniak, J., Mavroidis, T., Maxfield, S. J., Mcmahon, S. J., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P. O., Migliori, A., Mikocki, S., Milstead, D., Moeck, J., Moreau, F., Morris, J. V., Mroczko, E., Muller, D., Muller, K., Murin, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, T., Negri, I., Newman, P. R., Newton, D., Nguyen, H. K., Nicholls, T. C., Niebergall, F., Niebuhr, C., Niedzballa, C., Niggli, H., Nowak, G., Nunnemann, T., Oberlack, H., Olsson, J. E., Ozerov, D., Palmen, P., Panaro, E., Panitch, A., Pascaud, C., Passaggio, S., Patel, G. D., Pawletta, H., Peppel, E., Perez, E., Phillips, J. P., 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, D. P. C., Schacht, P., Schiek, S., Schleif, S., Schleper, P., Schlippe, W., Schmidt, D., Schmidt, G., Schoeffel, L., Schoning, A., Schroder, V., Schuhmann, E., Schwab, B., Sefkow, F., Semenov, A., Shekelian, V., Shevyakov, I., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Yu. Solovev, Specka, A., Spiekermann, J., Spielman, S., Spitzer, H., Squinabol, F., Steffen, P., Steinberg, R., Steinhart, J., Stella, B., Stellberger, A., Stiewe, J., Stosslein, U., Stolze, K., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Tasevsky, M., Chernyshov, V., Chechelnitskii, S., Theissen, J., Thompson, G., Thompson, P. D., Tobien, N., Todenhagen, R., Truol, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Uelkes, P., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Esch, P., Mechelen, P., Vandenplas, D., Ya. Vazdik, 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, L. R., Wiesand, S., Wilksen, T., Willard, S., Winde, M., Winter, G. G., Wittek, C., Wobisch, M., Wollatz, H., Wunsch, E., Zacek, J., Zarbock, D., Zhiqing Zhang, Zhokin, A., Zini, P., Zomer, F., Zsembery, J., Zur Nedden, M., Levy, Jean-Michel, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and H1 Collaboration
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Scattering, Detector, FOS: Physical sciences, Thrust, HERA, Large range, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Strong coupling, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment
Abstract: Deep inelastic e^+ scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening and jet mass in the current hemisphere of the Breit frame over a large range of momentum transfers Q between 7 GeV and 100 GeV. The data are compared with results from e^+e^- experiments. Using second order QCD calculations and an approach to relate hadronisation effects to power corrections an analysis of the Q dependences of the means of the event shape parameters is presented, from which both the power corrections and the strong coupling constant are determined without any assumption on fragmentation models. The power corrections of all event shape variables investigated follow a 1/Q behaviour and can be described by a common parameter alpha_0., Comment: 19 pages, latex, 4 Figures
Published: 1997

5. Energy Flow in the Hadronic Final State of Diffractive and Non-Diffractive Deep-Inelastic Scattering at HERA

Author: Aid, S., Zsembery, J., Zuber, K., Zurnedden, M., Zimmer, M., Zomer, F., Zhokin, A., Zarbock, D., Zhang, Z., Wunsch, E., Zacek, J., Yiou, T. P., Wittek, C., G Winter, G., Winde, M., Willard, S., Wilksen, T., Wellisch, H. P., West, L. R., Wegener, D., Wegner, A., Weber, M., Weber, G., Waugh, B., Walther, A., Wagener, M., Wagener, A., Wacker, K., Villet, G., Verrecchia, P., Vazdik, Y., Mechelen, P., Esch, P., Vandenplas, D., Vallee, C., Valkarova, A., Usik, A., Valkar, S., Tutas, J., Uelkes, P., Turnau, J., Truol, P., Thiebaux, C., Thompson, G., Theissen, J., Tchernyshov, V., Tchetchelnitski, S., Stolze, K., Tapprogge, S., Tasevsky, M., Straumann, U., Struczinski, W., Sutton, P., Stier, J., Stiewe, J., Stosslein, U., Steiner, H., Stella, B., Steffen, P., Steinberg, R., Steenbock, M., Squinabol, F., Starosta, R., Spiekermann, J., Spielman, S., Spitzer, H., Specka, A., Soloviev, Y., Solochenko, V., Smith, J. R., Smirnov, P., Sirois, Y., Skillicorn, I. O., Siewert, U., Sell, R., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Seidel, M., Sefkow, F., Schwab, B., Schumann, E., Schroder, V., Schmidt, G., Schoning, A., Semenov, A., Schmidt, D., Schlippe, W., Schleper, P., Schleif, S., Schiek, S., Schacht, P., Sankey, D. P. C., Sahlmann, N., Rybicki, K., Ruter, K., Rusakov, S., Rostovtsev, A., Rouse, F., Royon, C., Rosenbauer, K., Roosen, R., Roloff, H. E., Robmann, P., Robertson, S. M., Rizvi, E., Rietz, M., Riess, S., Riepenhausen, F., Riedlberger, J., Riech, V., Rick, H., Reinshagen, S., Reimer, P., Raupach, F., Radel, G., Prosi, R., Rabbertz, K., Prell, S., Pieuchot, A., Pitzl, D., Phillips, J. P., Perez, E., Pawletta, H., Peppel, E., Patel, G. D., Panitch, A., Pascaud, C., Panaro, E., Palmen, P., Ozerov, D., Obrock, U., Oakden, M., Oberlack, H., Olsson, J. E., Nyberg-Werther, M., Noyes, G. W., Nowak, G., Niggli, H., Nisius, R., Ch. Niedzballa, Niebuhr, C., Niebergall, F., Nicholls, T. C., Nguyen, H. K., Neyret, D., Newton, D., Newman, P. E., Th. Naumann, Naroska, B., Nahnhauer, R., Nagovizin, V., Murin, P., Muller, K., Muller, G., Muller, D., Mroczko, E., Morris, J. V., Moreau, F., Moeck, J., Milstead, D., Mikocki, S., Migliori, A., O Meyer, P., Meyer, H., Meyer, J., Merz, T., Meyer, A., Mehta, A., Meier, K., Maxfield, S. J., Mcmahon, S. J., Mavroidis, T., U Martyn, H., Martyniak, J., Masson, S., Martin, G., Roland Martin, Marshall, R., Martens, J., Marks, J., Maracek, R., Marage, P., Mani, S., Malinovski, E., Magnussen, N., Luke, D., Lubimov, V., Lopez, G. C., Lobo, G., Loch, P., Lohmander, H., Lomas, J. W., List, B., Link, J., Linsel, F., Lipinski, J., Levonian, S., Ch. Ley, Lindstrom, G., Lindstroem, M., Leverenz, C., F Laporte, J., Lebedev, A., Lehner, F., Langenegger, U., Lanius, P., Lange, W., Landon, M. P. J., Lamarche, F., Lander, R., Lacour, D., Laforge, B., Kurzhofer, J., Kurca, T., Kuster, H., Kuhlen, M., Kruger, U., Kruner-Marquis, U., Krucker, D., Krehbiel, H., Krasny, M. W., Kramerkamper, T., Kostka, P., Kotelnikov, S. K., Kolya, S. D., Korbel, V., Korn, M., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kohne, J. H., Kolanoski, H., Kole, F., Kaufmann, H. H., Kazarian, S., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Jonsson, L., Johannsen, K., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., A Jabiol, M., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Holtom, T., Horisberger, R., Hoffmann, D., Hoppner, M., Hoeger, K. C., Hladky, J., Hilton, C. D., Hiller, H., Hildesheim, W., Hess, M. F., Herynek, I., Andreev, V., Andrieu, B., D Appuhn, R., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Barth, M., Bassler, U., Beck, H. P., J Behred, H., Belousov, A., Ch. Berger, Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Clegg, A. B., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., C Cousinou, M., Ch. Coutures, Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Delcourt, B., Del Buono, L., Roeck, A., Wolf, E. A., Dirkmann, M., Dixon, P., Di Nezza, P., Dlugosz, W., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, A., Duboc, J., Dullmann, D., Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Fahr, A. B., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Glazov, A., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Griffiths, R., Grindhammer, G., Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hapke, M., Haynes, W. J., Heinzelmann, J., Henderson, R. C. W., Henschel, H., Hudgson, V. L., Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: Quantum chromodynamics, Physics, Current quark, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Scattering, Hadron, High Energy Physics::Phenomenology, FOS: Physical sciences, Perturbative QCD, HERA, Deep inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pomeron, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics
Abstract: An investigation of the hadronic final state in diffractive and non--diffractive deep--inelastic electron--proton scattering at HERA is presented, where diffractive data are selected experimentally by demanding a large gap in pseudo --rapidity around the proton remnant direction. The transverse energy flow in the hadronic final state is evaluated using a set of estimators which quantify topological properties. Using available Monte Carlo QCD calculations, it is demonstrated that the final state in diffractive DIS exhibits the features expected if the interaction is interpreted as the scattering of an electron off a current quark with associated effects of perturbative QCD. A model in which deep--inelastic diffraction is taken to be the exchange of a pomeron with partonic structure is found to reproduce the measurements well. Models for deep--inelastic $ep$ scattering, in which a sizeable diffractive contribution is present because of non--perturbative effects in the production of the hadronic final state, reproduce the general tendencies of the data but in all give a worse description., 22 pages, latex, 6 Figures appended as uuencoded file
Published: 1996

6. A Measurement and QCD Analysis of the Proton Structure Function $F_2(x,Q^2)$ at HERA

Author: Aid, S., Andreev, V., Andrieu, B., Appuhn, R. D., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Barth, M., Bassler, U., Beck, H. P., Behrend, H. J., Belousov, A., Berger, C., Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Clegg, A. B., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., Cousinou, M. C., Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Delcourt, B., Roeck, A., Wolf, E. A., Dirkmann, M., Dixon, P., Di Nezza, P., Dlugosz, W., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, V., Dullmann, D., Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Fahr, A. B., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Glazov, A., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Griffiths, R., Grindhammer, G., Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hampel, M., Haynes, W. J., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herynek, I., Hess, M. F., Hildesheim, W., Hiller, K. H., Hilton, C. D., Hladky, J., Hoeger, K. C., Hoppner, M., Hoffmann, D., Holtom, T., Horisberger, R., Hudgson, V. L., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Jonsson, L., Johannsen, K., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Kaufmann, H. H., Kauffman, O., Kazarian, S., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Kohler, T., Kohne, J., Kolanoski, H., Kole, F., Kolya, S. D., Korbel, V., Korn, M., Kostka, P., Kotelnikov, S. K., Kramerkamper, T., Krasny, M. W., Krehbiel, H., Krucker, D., Kruger, U., Kruner-Marquis, U., Kuster, H., Kuhlen, M., Kurca, T., Kurzhofer, J., Lacour, D., Laforge, B., Lander, R., Landon, M. P. J., Lange, W., Langenegger, U., Laporte, J. F., Lebedev, A., Lehner, F., Leverenz, C., Levonian, S., Ley, C., Lindstrom, G., Lindstrom, M., Link, J., Linsel, F., Lipinski, J., List, B., Lobo, G., Lohmander, H., Lomas, J., Lopez, G. C., Lyubimov, V., Luke, D., Magnussen, N., Malinovski, E., Mani, S., Maracek, R., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, G., Roland Martin, Martyn, H. U., Martyniak, J., Mavroidis, T., Maxfield, S. J., Mcmahon, S. J., Mehta, A., Meier, K., Merz, T., Meyer, A., Meyer, H., Meyer, J., Meyer, P. O., Migliori, A., Mikocki, S., Milstead, D., Mock, J., Moreau, F., Morris, J. V., Mroczko, E., Muller, D., Muller, G., Muller, K., Murin, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, T., Newman, P. R., Newton, D., Neyret, D., Nguyen, H. K., Nicholls, T. C., Niebergall, F., Niebuhr, C., Niedzballa, C., Niggli, H., Nisius, R., Nowak, G., Noyes, G. W., Nyberg-Werther, M., Oakden, M., Oberlack, H., Obrock, U., Olsson, J. E., Ozerov, D., Palmen, P., Panaro, E., Panitch, A., Pascaud, C., Patel, G. D., Pawletta, H., Peppel, E., Perez, E., Phillips, J. P., Pieuchot, A., Pitzl, D., Pope, G., Prell, S., Prosi, R., Rabbertz, K., Radel, G., Raupach, F., Reimer, P., Reinshagen, S., Rick, H., Riech, V., Riedlberger, J., Riepenhausen, F., Riess, S., Rizvi, E., Robertson, S. M., Robmann, P., Roloff, H. E., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Ruter, K., Rusakov, S., Rybicki, K., Sahlmann, N., Sankey, D. P., Schacht, P., Schiek, S., Schlief, S., Schleper, P., Schlippe, W., Schmidt, D., Schmidt, G., Schoning, A., Schroder, V., Schuhmann, E., Schwab, B., Sefkow, F., Seidel, M., Sell, R., Semenov, A., Shekelian, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., Smirnov, P., Smith, J. R., Solochenko, V., Ya. Solovev, Specka, A., Spiekermann, J., Spielman, S., Spitzer, H., Squinabol, F., Starosta, R., Steenbock, M., Steffen, P., Steinberg, R., Steiner, H., Stella, B., Stellberger, A., Stier, J., Stiewe, J., Stosslein, U., Stolze, K., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Tasevsky, M., Chernyshov, V., Chechelnitsky, S., Theissen, J., Thiebaux, C., Thompson, G., Truol, P., Turnau, J., Tutas, J., Ulkes, P., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Vandenplas, D., Esch, P., Mechelen, P., Vazdik, Y., Verrecchia, P., Villet, G., Wacker, K., Wagener, A., Wagener, M., Walther, A., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L. R., Wilksen, T., Willard, S., Winde, M., Winter, G. G., Wittek, C., Wunsch, E., Zacek, J., Zarbock, D., Zhiqing Zhang, Zhokin, A., Zimmer, M., Zomer, F., Zsembery, J., Zuber, K., Zur Nedde, M., Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Order (ring theory), FOS: Physical sciences, HERA, State (functional analysis), 01 natural sciences, High Energy Physics - Experiment, Gluon, Momentum, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Range (statistics), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics
Abstract: A new measurement of the proton structure function $F_2(x,Q^2)$ is reported for momentum transfers squared $Q^2$ between 1.5 GeV$^2$ and 5000 GeV$^2$ and for Bjorken $x$ between $3\cdot 10^{-5}$ and 0.32 using data collected by the HERA experiment H1 in 1994. The data represent an increase in statistics by a factor of ten with respect to the analysis of the 1993 data. Substantial extension of the kinematic range towards low $Q^2$ and $x$ has been achieved using dedicated data samples and events with initial state photon radiation. The structure function is found to increase significantly with decreasing $x$, even in the lowest accessible $Q^2$ region. The data are well described by a Next to Leading Order QCD fit and the gluon density is extracted., Comment: 35 pages, latex, 12 Figures (3 bitmapped)
Published: 1996
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7. Elastic photoproduction of $\rho^{0}$ mesons at HERA

Author: Aid, S., Zsembery, J., Zuber, K., Zurnedden, M., Zimmer, M., Zomer, F., Zhokin, A., Zarbock, D., Zhiqing Zhang, Wunsch, E., Zacek, J., Yiou, T. P., Wittek, C., G Winter, G., Winde, M., Willard, S., Wilksen, T., Wellisch, H. P., West, L. R., Wegener, D., Wegner, A., Weber, M., Weber, G., Waugh, B., Walther, A., Wagener, M., Wagener, A., Wacker, K., Villet, G., Verrecchia, P., Vazdik, Y., Mechelen, P., Esch, P., Vandenplas, D., Vallee, C., Valkarova, A., Usik, A., Valkar, S., Tutas, J., Uelkes, P., Turnau, J., Truol, P., Thiebaux, C., Thompson, G., Theissen, J., Tchernyshov, V., Tchetchelnitski, S., Stolze, K., Tapprogge, S., Tasevsky, M., Straumann, U., Struczinski, W., Sutton, P., Stier, J., Stiewe, J., Stosslein, U., Steiner, H., Stella, B., Steffen, P., Steinberg, R., Steenbock, M., Squinabol, F., Starosta, R., Spiekermann, J., Spielman, S., Spitzer, H., Specka, A., Soloviev, Y., Solochenko, V., Smith, J. R., Smirnov, P., Sirois, Y., Skillicorn, I. O., Siewert, U., Sell, R., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Seidel, M., Sefkow, F., Schwab, B., Schumann, E., Schroder, V., Schmidt, G., Schoning, A., Semenov, A., Schmidt, D., Schlippe, W., Schleper, P., Schleif, S., Schiek, S., Schacht, P., Sankey, D. P. C., Sahlmann, N., Rybicki, K., Ruter, K., Rusakov, S., Rostovtsev, A., Rouse, F., Royon, C., Rosenbauer, K., Roosen, R., Roloff, H. E., Robmann, P., Robertson, S. M., Rizvi, E., Rietz, M., Riess, S., Riepenhausen, F., Riedlberger, J., Riech, V., Rick, H., Reinshagen, S., Reimer, P., Raupach, F., Radel, G., Prosi, R., Rabbertz, K., Prell, S., Pieuchot, A., Pitzl, D., Phillips, J. P., Perez, E., Pawletta, H., Peppel, E., Patel, G. D., Panitch, A., Pascaud, C., Panaro, E., Palmen, P., Ozerov, D., Obrock, U., Oakden, M., Oberlack, H., Olsson, J. E., Nyberg-Werther, M., Noyes, G. W., Nowak, G., Niggli, H., Nisius, R., Ch. Niedzballa, Niebuhr, C., Niebergall, F., Nicholls, T. C., Nguyen, H. K., Neyret, D., Newton, D., Newman, P. E., Th. Naumann, Naroska, B., Nahnhauer, R., Nagovizin, V., Murin, P., Muller, K., Muller, G., Muller, D., Mroczko, E., Morris, J. V., Moreau, F., Moeck, J., Milstead, D., Mikocki, S., Migliori, A., O Meyer, P., Meyer, H., Meyer, J., Merz, T., Meyer, A., Mehta, A., Meier, K., Maxfield, S. J., Mcmahon, S. J., Mavroidis, T., U Martyn, H., Martyniak, J., Masson, S., Martin, G., Roland Martin, Marshall, R., Martens, J., Marks, J., Maracek, R., Marage, P., Mani, S., Malinovski, E., Magnussen, N., Luke, D., Lubimov, V., Lopez, G. C., Lobo, G., Loch, P., Lohmander, H., Lomas, J. W., List, B., Link, J., Linsel, F., Lipinski, J., Levonian, S., Ch. Ley, Lindstrom, G., Lindstroem, M., Leverenz, C., F Laporte, J., Lebedev, A., Lehner, F., Langenegger, U., Lanius, P., Lange, W., Landon, M. P. J., Lamarche, F., Lander, R., Lacour, D., Laforge, B., Kurzhofer, J., Kurca, T., Kuster, H., Kuhlen, M., Kruger, U., Kruner-Marquis, U., Krucker, D., Krehbiel, H., Krasny, M. W., Kramerkamper, T., Kostka, P., Kotelnikov, S. K., Kolya, S. D., Korbel, V., Korn, M., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kohne, J. H., Kolanoski, H., Kole, F., Kaufmann, H. H., Kazarian, S., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Jonsson, L., Johannsen, K., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., A Jabiol, M., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Holtom, T., Horisberger, R., Hoffmann, D., Hoppner, M., Hoeger, K. C., Hladky, J., Hilton, C. D., Hiller, H., Hildesheim, W., Hess, M. F., Herynek, I., Andreev, V., Andrieu, B., D Appuhn, R., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Barth, M., Bassler, U., Beck, H. P., J Behred, H., Belousov, A., Ch. Berger, Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Clegg, A. B., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., C Cousinou, M., Ch. Coutures, Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Delcourt, B., Del Buono, L., Roeck, A., Wolf, E. A., Dirkmann, M., Dixon, P., Di Nezza, P., Dlugosz, W., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, A., Duboc, J., Dullmann, D., Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Fahr, A. B., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Glazov, A., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Griffiths, R., Grindhammer, G., Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hapke, M., Haynes, W. J., Heinzelmann, J., Henderson, R. C. W., Henschel, H., Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Kerec, Hélène, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Hadron, HERA, 01 natural sciences, 7. Clean energy, Helicity, Lower energy, High Energy Physics - Experiment, Angular distribution, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract: The cross section for the elastic photoproduction of \r0 mesons ($\gamma p \to \rho^0 p$) has been measured with the H1 detector at HERA for two average photon-proton centre-of-mass energies of 55 and 187 GeV. TheFcenterline lower energy point was measured by observing directly the $\rho^{0}$ decay giving a cross section of $9.1\pm 0.9 (\stat)\pm 2.5 (\syst) \mu$b. The logarithmic slope parameter of the differential cross section, ${\rm d}\sigma/{\rm d}t$, is found to be $10.9 \pm 2.4 (\stat) \pm 1.1 (\syst) $GeV$^{-2}$. The \r0 decay polar angular distribution is found to be consistent with s-channel helicity conservation. The higher energy cross section was determined from analysis of the lower part of the hadronic invariant mass spectrum of diffractive photoproduction and found to be $13.6\pm 0.8 (\stat)\pm 2.4 (\syst) \mu$b., Comment: 25 pages, latex, 9 Figures appended as uuencoded file
Published: 1996

8. Charged particle multiplicities in deep inelastic scattering at HERA

Author: Aid, S., Zsembery, J., Zuber, K., Zurnedden, M., Zimmer, M., Zomer, F., Zhokin, A., Zarbock, D., Zhiqing Zhang, Wunsch, E., Zacek, J., Yiou, T. P., Wittek, C., G Winter, G., Winde, M., Willard, S., Wilksen, T., Wellisch, H. P., West, L. R., Wegener, D., Wegner, A., Weber, M., Weber, G., Waugh, B., Walther, A., Wagener, M., Wagener, A., Wacker, K., Villet, G., Verrecchia, P., Vazdik, Y., Mechelen, P., Esch, P., Vandenplas, D., Vallee, C., Valkarova, A., Usik, A., Valkar, S., Tutas, J., Uelkes, P., Turnau, J., Truol, P., Thiebaux, C., Thompson, G., Theissen, J., Tchernyshov, V., Tchetchelnitski, S., Stolze, K., Tapprogge, S., Tasevsky, M., Straumann, U., Struczinski, W., Sutton, P., Stier, J., Stiewe, J., Stosslein, U., Steiner, H., Stella, B., Steffen, P., Steinberg, R., Steenbock, M., Squinabol, F., Starosta, R., Spiekermann, J., Spielman, S., Spitzer, H., Specka, A., Soloviev, Y., Solochenko, V., Smith, J. R., Smirnov, P., Sirois, Y., Skillicorn, I. O., Siewert, U., Sell, R., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Seidel, M., Sefkow, F., Schwab, B., Schumann, E., Schroder, V., Schmidt, G., Schoning, A., Semenov, A., Schmidt, D., Schlippe, W., Schleper, P., Schleif, S., Schiek, S., Schacht, P., Sankey, D. P. C., Sahlmann, N., Rybicki, K., Ruter, K., Rusakov, S., Rostovtsev, A., Rouse, F., Royon, C., Rosenbauer, K., Roosen, R., Roloff, H. E., Robmann, P., Robertson, S. M., Rizvi, E., Rietz, M., Riess, S., Riepenhausen, F., Riedlberger, J., Riech, V., Rick, H., Reinshagen, S., Reimer, P., Raupach, F., Radel, G., Prosi, R., Rabbertz, K., Prell, S., Pieuchot, A., Pitzl, D., Phillips, J. P., Perez, E., Pawletta, H., Peppel, E., Patel, G. D., Panitch, A., Pascaud, C., Panaro, E., Palmen, P., Ozerov, D., Obrock, U., Oakden, M., Oberlack, H., Olsson, J. E., Nyberg-Werther, M., Noyes, G. W., Nowak, G., Niggli, H., Nisius, R., Ch. Niedzballa, Niebuhr, C., Niebergall, F., Nicholls, T. C., Nguyen, H. K., Neyret, D., Newton, D., Newman, P. E., Th. Naumann, Naroska, B., Nahnhauer, R., Nagovizin, V., Murin, P., Muller, K., Muller, G., Muller, D., Mroczko, E., Morris, J. V., Moreau, F., Moeck, J., Milstead, D., Mikocki, S., Migliori, A., O Meyer, P., Meyer, H., Meyer, J., Merz, T., Meyer, A., Mehta, A., Meier, K., Maxfield, S. J., Mcmahon, S. J., Mavroidis, T., U Martyn, H., Martyniak, J., Masson, S., Martin, G., Roland Martin, Marshall, R., Martens, J., Marks, J., Maracek, R., Marage, P., Mani, S., Malinovski, E., Magnussen, N., Luke, D., Lubimov, V., Lopez, G. C., Lobo, G., Loch, P., Lohmander, H., Lomas, J. W., List, B., Link, J., Linsel, F., Lipinski, J., Levonian, S., Ch. Ley, Lindstrom, G., Lindstroem, M., Leverenz, C., F Laporte, J., Lebedev, A., Lehner, F., Langenegger, U., Lanius, P., Lange, W., Landon, M. P. J., Lamarche, F., Lander, R., Lacour, D., Laforge, B., Kurzhofer, J., Kurca, T., Kuster, H., Kuhlen, M., Kruger, U., Kruner-Marquis, U., Krucker, D., Krehbiel, H., Krasny, M. W., Kramerkamper, T., Kostka, P., Kotelnikov, S. K., Kolya, S. D., Korbel, V., Korn, M., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kohne, J. H., Kolanoski, H., Kole, F., Kaufmann, H. H., Kazarian, S., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Jonsson, L., Johannsen, K., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., A Jabiol, M., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Holtom, T., Horisberger, R., Hoffmann, D., Hoppner, M., Hoeger, K. C., Hladky, J., Hilton, C. D., Hiller, H., Hildesheim, W., Hess, M. F., Herynek, I., Andreev, V., Andrieu, B., D Appuhn, R., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Barth, M., Bassler, U., Beck, H. P., J Behred, H., Belousov, A., Ch. Berger, Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Clegg, A. B., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., C Cousinou, M., Ch. Coutures, Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Delcourt, B., Del Buono, L., Roeck, A., Wolf, E. A., Dirkmann, M., Dixon, P., Di Nezza, P., Dlugosz, W., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, A., Duboc, J., Dullmann, D., Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Fahr, A. B., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Glazov, A., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Griffiths, R., Grindhammer, G., Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hapke, M., Haynes, W. J., Heinzelmann, J., Henderson, R. C. W., Henschel, H., Hudgson, V. L., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), H1, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and Kerec, Hélène
Subjects: Quantum chromodynamics, Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, FOS: Physical sciences, Parton, Multiplicity (mathematics), HERA, Deep inelastic scattering, 01 natural sciences, Charged particle, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pseudorapidity, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract: Using the H1 detector at HERA, charged particle multiplicity distributions in deep inelastic ep scattering have been measured over a large kinematical region. The evolution with $W$ and $Q^2$ of the multiplicity distribution and of the multiplicity moments in pseudorapidity domains of varying size is studied in the current fragmentation region of the hadronic centre-of-mass frame. The results are compared with data from fixed target lepton-nucleon interactions, $e^+e^-$ annihilations and hadron-hadron collisions as well as with expectations from QCD based parton models. Fits to the Negative Binomial and Lognormal distributions are presented., 40 pages, latex, 8 Figures

9. Elastic and inelastic photoproduction of J/$\psi$ mesons at HERA

Author: Aid, S., Zsembery, J., Zuber, K., Zurnedden, M., Zimmer, M., Zomer, F., Zhokin, A., Zarbock, D., Zhang, Z., Wunsch, E., Zacek, J., Yiou, T. P., Wittek, C., G Winter, G., Winde, M., Willard, S., Wilksen, T., Wellisch, H. P., West, L. R., Wegener, D., Wegner, A., Weber, M., Weber, G., Waugh, B., Walther, A., Wagener, M., Wagener, A., Wacker, K., Villet, G., Verrecchia, P., Vazdik, Y., Mechelen, P., Esch, P., Vandenplas, D., Vallee, C., Valkarova, A., Usik, A., Valkar, S., Tutas, J., Uelkes, P., Turnau, J., Truol, P., Thiebaux, C., Thompson, G., Theissen, J., Tchernyshov, V., Tchetchelnitski, S., Stolze, K., Tapprogge, S., Tasevsky, M., Straumann, U., Struczinski, W., Sutton, P., Stier, J., Stiewe, J., Stosslein, U., Steiner, H., Stella, B., Steffen, P., Steinberg, R., Steenbock, M., Squinabol, F., Starosta, R., Spiekermann, J., Spielman, S., Spitzer, H., Specka, A., Soloviev, Y., Solochenko, V., Smith, J. R., Smirnov, P., Sirois, Y., Skillicorn, I. O., Siewert, U., Sell, R., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Seidel, M., Sefkow, F., Schwab, B., Schumann, E., Schroder, V., Schmidt, G., Schoning, A., Semenov, A., Schmidt, D., Schlippe, W., Schleper, P., Schleif, S., Schiek, S., Schacht, P., Sankey, D. P. C., Sahlmann, N., Rybicki, K., Ruter, K., Rusakov, S., Rostovtsev, A., Rouse, F., Royon, C., Rosenbauer, K., Roosen, R., Roloff, H. E., Robmann, P., Robertson, S. M., Rizvi, E., Rietz, M., Riess, S., Riepenhausen, F., Riedlberger, J., Riech, V., Rick, H., Reinshagen, S., Reimer, P., Raupach, F., Radel, G., Prosi, R., Rabbertz, K., Prell, S., Pieuchot, A., Pitzl, D., Phillips, J. P., Perez, E., Pawletta, H., Peppel, E., Patel, G. D., Panitch, A., Pascaud, C., Panaro, E., Palmen, P., Ozerov, D., Obrock, U., Oakden, M., Oberlack, H., Olsson, J. E., Nyberg-Werther, M., Noyes, G. W., Nowak, G., Niggli, H., Nisius, R., Ch. Niedzballa, Niebuhr, C., Niebergall, F., Nicholls, T. C., Nguyen, H. K., Neyret, D., Newton, D., Newman, P. E., Th. Naumann, Naroska, B., Nahnhauer, R., Nagovizin, V., Murin, P., Muller, K., Muller, G., Muller, D., Mroczko, E., Morris, J. V., Moreau, F., Moeck, J., Milstead, D., Mikocki, S., Migliori, A., O Meyer, P., Meyer, H., Meyer, J., Merz, T., Meyer, A., Mehta, A., Meier, K., Maxfield, S. J., Mcmahon, S. J., Mavroidis, T., U Martyn, H., Martyniak, J., Masson, S., Martin, G., Roland Martin, Marshall, R., Martens, J., Marks, J., Maracek, R., Marage, P., Mani, S., Malinovski, E., Magnussen, N., Luke, D., Lubimov, V., Lopez, G. C., Lobo, G., Loch, P., Lohmander, H., Lomas, J. W., List, B., Link, J., Linsel, F., Lipinski, J., Levonian, S., Ch. Ley, Lindstrom, G., Lindstroem, M., Leverenz, C., F Laporte, J., Lebedev, A., Lehner, F., Langenegger, U., Lanius, P., Lange, W., Landon, M. P. J., Lamarche, F., Lander, R., Lacour, D., Laforge, B., Kurzhofer, J., Kurca, T., Kuster, H., Kuhlen, M., Kruger, U., Kruner-Marquis, U., Krucker, D., Krehbiel, H., Krasny, M. W., Kramerkamper, T., Kostka, P., Kotelnikov, S. K., Kolya, S. D., Korbel, V., Korn, M., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kohne, J. H., Kolanoski, H., Kole, F., Kaufmann, H. H., Kazarian, S., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Jonsson, L., Johannsen, K., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., A Jabiol, M., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Holtom, T., Horisberger, R., Hoffmann, D., Hoppner, M., Hoeger, K. C., Hladky, J., Hilton, C. D., Hiller, H., Hildesheim, W., Hess, M. F., Herynek, I., Andreev, V., Andrieu, B., D Appuhn, R., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Barth, M., Bassler, U., Beck, H. P., J Behred, H., Belousov, A., Ch. Berger, Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Clegg, A. B., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., C Cousinou, M., Ch. Coutures, Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Delcourt, B., Del Buono, L., Roeck, A., Wolf, E. A., Dirkmann, M., Dixon, P., Di Nezza, P., Dlugosz, W., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, A., Duboc, J., Dullmann, D., Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Fahr, A. B., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Glazov, A., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Griffiths, R., Grindhammer, G., Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hapke, M., Haynes, W. J., Heinzelmann, J., Henderson, R. C. W., Henschel, H., Hudgson, V. L., Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Photon, Meson, 010308 nuclear & particles physics, FOS: Physical sciences, HERA, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Transverse plane, Cross section (physics), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Production (computer science), High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: Results on \jpsi production in $e p$ interactionsin the H1 experiment at HERA are presented. The \jpsi mesons are produced by almost real photons ($Q^2\approx 0$) and detected via their leptonic decays. The data have been taken in 1994 and correspond to an integrated luminosity of $2.7 {pb}^{-1}$. The $\gamma p$ cross section for elastic \jpsi production is observed to increase strongly with the \cm energy. The cross section for diffractive $J/\psi$ production with proton dissociation is found to be of similar magnitude as the elastic cross section. Distributions of transverse momentum and decay angle are studied and found to be in accord with a diffractive production mechanism. For inelastic \jpsi production the total $\gamma p$ cross section, the distribution of transverse momenta, and the elasticity of the \jpsi are compared to NLO QCD calculations in a colour singlet model and agreement is found. Diffractive \psiprime production has been observed and a first estimate of the ratio to \jpsi production in the HERA energy regime is given., Comment: 27 pages, latex, 9 Figures appended as uuencoded file, figure 8b replaced

10. A search for selectrons and squarks at HERA

Author: Aid, S., Zsembery, J., Zuber, K., Zurnedden, M., Zimmer, M., Zomer, F., Zhokin, A., Zarbock, D., Zhiqing Zhang, Wunsch, E., Zacek, J., Yiou, T. P., Wittek, C., G Winter, G., Winde, M., Willard, S., Wilksen, T., Wellisch, H. P., West, L. R., Wegener, D., Wegner, A., Weber, M., Weber, G., Waugh, B., Walther, A., Wagener, M., Wagener, A., Wacker, K., Villet, G., Verrecchia, P., Vazdik, Y., Mechelen, P., Esch, P., Vandenplas, D., Vallee, C., Valkarova, A., Usik, A., Valkar, S., Tutas, J., Uelkes, P., Turnau, J., Truol, P., Thiebaux, C., Thompson, G., Theissen, J., Tchernyshov, V., Tchetchelnitski, S., Stolze, K., Tapprogge, S., Tasevsky, M., Straumann, U., Struczinski, W., Sutton, P., Stier, J., Stiewe, J., Stosslein, U., Steiner, H., Stella, B., Steffen, P., Steinberg, R., Steenbock, M., Squinabol, F., Starosta, R., Spiekermann, J., Spielman, S., Spitzer, H., Specka, A., Soloviev, Y., Solochenko, V., Smith, J. R., Smirnov, P., Sirois, Y., Skillicorn, I. O., Siewert, U., Sell, R., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Seidel, M., Sefkow, F., Schwab, B., Schumann, E., Schroder, V., Schmidt, G., Schoning, A., Semenov, A., Schmidt, D., Schlippe, W., Schleper, P., Schleif, S., Schiek, S., Schacht, P., Sankey, D. P. C., Sahlmann, N., Rybicki, K., Ruter, K., Rusakov, S., Rostovtsev, A., Rouse, F., Royon, C., Rosenbauer, K., Roosen, R., Roloff, H. E., Robmann, P., Robertson, S. M., Rizvi, E., Rietz, M., Riess, S., Riepenhausen, F., Riedlberger, J., Riech, V., Rick, H., Reinshagen, S., Reimer, P., Raupach, F., Radel, G., Prosi, R., Rabbertz, K., Prell, S., Pieuchot, A., Pitzl, D., Phillips, J. P., Perez, E., Pawletta, H., Peppel, E., Patel, G. D., Panitch, A., Pascaud, C., Panaro, E., Palmen, P., Ozerov, D., Obrock, U., Oakden, M., Oberlack, H., Olsson, J. E., Nyberg-Werther, M., Noyes, G. W., Nowak, G., Niggli, H., Nisius, R., Ch. Niedzballa, Niebuhr, C., Niebergall, F., Nicholls, T. C., Nguyen, H. K., Neyret, D., Newton, D., Newman, P. E., Th. Naumann, Naroska, B., Nahnhauer, R., Nagovizin, V., Murin, P., Muller, K., Muller, G., Muller, D., Mroczko, E., Morris, J. V., Moreau, F., Moeck, J., Milstead, D., Mikocki, S., Migliori, A., O Meyer, P., Meyer, H., Meyer, J., Merz, T., Meyer, A., Mehta, A., Meier, K., Maxfield, S. J., Mcmahon, S. J., Mavroidis, T., U Martyn, H., Martyniak, J., Masson, S., Martin, G., Roland Martin, Marshall, R., Martens, J., Marks, J., Maracek, R., Marage, P., Mani, S., Malinovski, E., Magnussen, N., Luke, D., Lubimov, V., Lopez, G. C., Lobo, G., Loch, P., Lohmander, H., Lomas, J. W., List, B., Link, J., Linsel, F., Lipinski, J., Levonian, S., Ch. Ley, Lindstrom, G., Lindstroem, M., Leverenz, C., F Laporte, J., Lebedev, A., Lehner, F., Langenegger, U., Lanius, P., Lange, W., Landon, M. P. J., Lamarche, F., Lander, R., Lacour, D., Laforge, B., Kurzhofer, J., Kurca, T., Kuster, H., Kuhlen, M., Kruger, U., Kruner-Marquis, U., Krucker, D., Krehbiel, H., Krasny, M. W., Kramerkamper, T., Kostka, P., Kotelnikov, S. K., Kolya, S. D., Korbel, V., Korn, M., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kohne, J. H., Kolanoski, H., Kole, F., Kaufmann, H. H., Kazarian, S., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Jonsson, L., Johannsen, K., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., A Jabiol, M., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Holtom, T., Horisberger, R., Hoffmann, D., Hoppner, M., Hoeger, K. C., Hladky, J., Hilton, C. D., Hiller, H., Hildesheim, W., Hess, M. F., Herynek, I., Andreev, V., Andrieu, B., D Appuhn, R., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Barth, M., Bassler, U., Beck, H. P., J Behred, H., Belousov, A., Ch. Berger, Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Clegg, A. B., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., C Cousinou, M., Ch. Coutures, Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Delcourt, B., Del Buono, L., Roeck, A., Wolf, E. A., Dirkmann, M., Dixon, P., Di Nezza, P., Dlugosz, W., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, A., Duboc, J., Dullmann, D., Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Fahr, A. B., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Glazov, A., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Griffiths, R., Grindhammer, G., Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hapke, M., Haynes, W. J., Heinzelmann, J., Henderson, R. C. W., Henschel, H., Hudgson, V. L., Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Missing energy, 010308 nuclear & particles physics, Hadron, High Energy Physics::Phenomenology, FOS: Physical sciences, Electron, HERA, 01 natural sciences, Lightest Supersymmetric Particle, High Energy Physics - Experiment, Selectron tube, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Transverse momentum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract: Data from electron-proton collisions at a center-of-mass energy of 300 GeV are used for a search for selectrons and squarks within the framework of the minimal supersymmetric model. The decays of selectrons and squarks into the lightest supersymmetric particle lead to final states with an electron and hadrons accompanied by large missing energy and transverse momentum. No signal is found and new bounds on the existence of these particles are derived. At 95% confidence level the excluded region extends to 65 GeV for selectron and squark masses, and to 40 GeV for the mass of the lightest supersymmetric particle., Comment: 13 pages, latex, 6 Figures

11. Forward π○-meson production at HERA

Author: 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., Biddulph, P., Bizot, J. C., Borras, K., Boudry, V., Braunschweig, W., Brisson, V., Broker, H. -B, Brown, D. P., Bruckner, W., Bruel, P., Bruncko, D., Bürger, J., Busser, F. W., Bunyatyan, A., Burke, S., Burrage, A., Buschhorn, G., Campbell, A. J., Cao, J., Carli, T., Chabert, E., Charlet, M., 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., Demirchyan, R., Roeck, A., 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., Elsen, E., Erdmann, M., Fahr, A. B., Faulkner, P. J. W., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Ferron, S., Fleischer, M., Flügge, G., Fomenko, A., Foresti, I., Formánek, J., Foster, J. M., Franke, G., Gabathuler, E., Gabathuler, K., Garvey, J., Gassner, J., Gayler, J., Gerhards, R., Ghazaryan, S., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Gorelov, I., Grab, C., Grassler, 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., Höting, P., Hoffmann, D., Horisberger, R., Hurling, S., Ibbotson, M., Işsever, C., Jacquet, M., Jaffre, M., Janauschek, L., Jansen, D. M., Janssen, X., Jönsson, L., Johnson, D. P., Jones, M., Jung, H., Kästli, H. K., Kant, D., Kapichine, M., Karlsson, M., Karschnick, O., Kaufmann, O., Kausch, M., Keil, F., Keller, N., Kenyon, I. R., Kermiche, S., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Kolanoski, H., Kolya, S. D., Korbel, V., Kostka, P., Kotelnikov, S. K., Krasny, M. W., Krehbiel, H., Kroseberg, J., Krucker, D., Krüger, K., Küpper, A., Kuhr, T., Kurca, T., Lachnit, W., Lahmann, R., Lamb, D., Landon, M. P. J., Lange, W., Lebedev, A., Lehner, F., Lemaitre, V., Lemrani, R., Lendermann, V., Levonian, S., Lindstroem, M., Lobo, G., Lobodzinska, E., Lubimov, V., Luders, S., Lüke, D., Lytkin, L., Magnussen, N., Mahlke-Kruger, H., Malden, N., Malinovski, E., Malinovski, I., Maraček, 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., Mohr, R., Mohrdieck, S., Mondragon, M. N., Moreau, F., Morozov, A., Morris, J. V., Muller, D., Muller, K., Murín, 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., Pöschl, R., Potashnikova, I., Povh, B., Rabbertz, K., Radel, 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., Schörner, T., Schroder, V., Schultz-Coulon, H. -C, Sefkow, F., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Sievers, P., Sirois, Y., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., 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., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Thompson, G., Thompson, P. D., Tobien, N., Traynor, D., Truöl, P., Tsipolitis, G., Turnau, J., Turney, J., Tzamariudaki, E., Udluft, S., Usik, A., Valkar, S., Alice Valkárová, Vallée, C., Haecke, A., Mechelen, P., Vazdik, Y., Villet, G., 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., Žáček, J., Zálešák, J., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., and Zur Nedden, M.
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Proton, High Energy Physics::Phenomenology, Virtual particle, Parton, HERA, DGLAP, Pseudorapidity, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract: High transverse momentum pi0-mesons have been measured with the H1 detector at HERA in deep-inelastic ep scattering events at low Bjorken-x, down to x

12. Strangeness production in deep-inelastic positron-proton scattering at HERA

Author: Aid, S., Zsembery, J., Zuber, K., Zurnedden, M., Zimmer, M., Zomer, F., Zhokin, A., Zarbock, D., Zhiqing Zhang, Wunsch, E., Zacek, J., Yiou, T. P., Wittek, C., G Winter, G., Winde, M., Willard, S., Wilksen, T., Wellisch, H. P., West, L. R., Wegener, D., Wegner, A., Weber, M., Weber, G., Waugh, B., Walther, A., Wagener, M., Wagener, A., Wacker, K., Villet, G., Verrecchia, P., Vazdik, Y., Mechelen, P., Esch, P., Vandenplas, D., Vallee, C., Valkarova, A., Usik, A., Valkar, S., Tutas, J., Uelkes, P., Turnau, J., Truol, P., Thiebaux, C., Thompson, G., Theissen, J., Tchernyshov, V., Tchetchelnitski, S., Stolze, K., Tapprogge, S., Tasevsky, M., Straumann, U., Struczinski, W., Sutton, P., Stier, J., Stiewe, J., Stosslein, U., Steiner, H., Stella, B., Steffen, P., Steinberg, R., Steenbock, M., Squinabol, F., Starosta, R., Spiekermann, J., Spielman, S., Spitzer, H., Specka, A., Soloviev, Y., Solochenko, V., Smith, J. R., Smirnov, P., Sirois, Y., Skillicorn, I. O., Siewert, U., Sell, R., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Seidel, M., Sefkow, F., Schwab, B., Schumann, E., Schroder, V., Schmidt, G., Schoning, A., Semenov, A., Schmidt, D., Schlippe, W., Schleper, P., Schleif, S., Schiek, S., Schacht, P., Sankey, D. P. C., Sahlmann, N., Rybicki, K., Ruter, K., Rusakov, S., Rostovtsev, A., Rouse, F., Royon, C., Rosenbauer, K., Roosen, R., Roloff, H. E., Robmann, P., Robertson, S. M., Rizvi, E., Rietz, M., Riess, S., Riepenhausen, F., Riedlberger, J., Riech, V., Rick, H., Reinshagen, S., Reimer, P., Raupach, F., Radel, G., Prosi, R., Rabbertz, K., Prell, S., Pieuchot, A., Pitzl, D., Phillips, J. P., Perez, E., Pawletta, H., Peppel, E., Patel, G. D., Panitch, A., Pascaud, C., Panaro, E., Palmen, P., Ozerov, D., Obrock, U., Oakden, M., Oberlack, H., Olsson, J. E., Nyberg-Werther, M., Noyes, G. W., Nowak, G., Niggli, H., Nisius, R., Ch. Niedzballa, Niebuhr, C., Niebergall, F., Nicholls, T. C., Nguyen, H. K., Neyret, D., Newton, D., Newman, P. E., Th. Naumann, Naroska, B., Nahnhauer, R., Nagovizin, V., Murin, P., Muller, K., Muller, G., Muller, D., Mroczko, E., Morris, J. V., Moreau, F., Moeck, J., Milstead, D., Mikocki, S., Migliori, A., O Meyer, P., Meyer, H., Meyer, J., Merz, T., Meyer, A., Mehta, A., Meier, K., Maxfield, S. J., Mcmahon, S. J., Mavroidis, T., U Martyn, H., Martyniak, J., Masson, S., Martin, G., Roland Martin, Marshall, R., Martens, J., Marks, J., Maracek, R., Marage, P., Mani, S., Malinovski, E., Magnussen, N., Luke, D., Lubimov, V., Lopez, G. C., Lobo, G., Loch, P., Lohmander, H., Lomas, J. W., List, B., Link, J., Linsel, F., Lipinski, J., Levonian, S., Ch. Ley, Lindstrom, G., Lindstroem, M., Leverenz, C., F Laporte, J., Lebedev, A., Lehner, F., Langenegger, U., Lanius, P., Lange, W., Landon, M. P. J., Lamarche, F., Lander, R., Lacour, D., Laforge, B., Kurzhofer, J., Kurca, T., Kuster, H., Kuhlen, M., Kruger, U., Kruner-Marquis, U., Krucker, D., Krehbiel, H., Krasny, M. W., Kramerkamper, T., Kostka, P., Kotelnikov, S. K., Kolya, S. D., Korbel, V., Korn, M., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kohne, J. H., Kolanoski, H., Kole, F., Kaufmann, H. H., Kazarian, S., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Jonsson, L., Johannsen, K., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., A Jabiol, M., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Holtom, T., Horisberger, R., Hoffmann, D., Hoppner, M., Hoeger, K. C., Hladky, J., Hilton, C. D., Hiller, H., Hildesheim, W., Hess, M. F., Herynek, I., Andreev, V., Andrieu, B., D Appuhn, R., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Barth, M., Bassler, U., Beck, H. P., J Behred, H., Belousov, A., Ch. Berger, Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Clegg, A. B., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., C Cousinou, M., Ch. Coutures, Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Delcourt, B., Del Buono, L., Roeck, A., Wolf, E. A., Dirkmann, M., Dixon, P., Di Nezza, P., Dlugosz, W., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, A., Duboc, J., Dullmann, D., Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Fahr, A. B., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Glazov, A., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Griffiths, R., Grindhammer, G., Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hapke, M., Haynes, W. J., Heinzelmann, J., Henderson, R. C. W., Henschel, H., Hudgson, V. L., Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, 010308 nuclear & particles physics, Scattering, Hadron, FOS: Physical sciences, Strangeness production, HERA, 01 natural sciences, High Energy Physics - Experiment, Baryon, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics
Abstract: Measurements are presented of $K^0$ meson and $��$ baryon production in deep-inelastic positron-proton scattering (DIS) in the kinematic range $10 < Q^2 < 70 $GeV$^2$ and $10^{-4} < x < 10^{-2}$. The measurements, obtained using the H1 detector at the HERA collider, are discussed in the light of possible mechanisms for increased strangeness production at low Bjorken-$x$. Comparisons of the $x_F$ spectra, where $x_F$ is the fractional longitudinal momentum in the hadronic centre-of-mass frame, with results from electron-positron annihilation are made. The $x_F$ spectra and the $K^0$ ``seagull'' plot are compared with previous DIS results. The mean $K^0$ and $��$ multiplicities are studied as a function of the centre-of-mass energy $W$ and are observed to be consistent with a logarithmic increase with $W$ when compared with previous measurements. A comparison of the levels of strangeness production in diffractive and non-diffractive DIS is made. An upper limit of $0.9 $nb, at the 95% confidence level, is placed on the cross-section for QCD instanton induced events., 36 pages, latex, 15 Figures

13. Diffraction dissociation in photoproduction at HERA

Author: Adloff, C., Aid, S., Anderson, M., Andreev, V., Andrieu, B., Arkadov, V., Arndt, C., Ayyaz, I., Babaev, A., Bähr, J., Bán, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Bassler, U., Beck, H. P., Beck, M., Behrend, H. -J, Belousov, A., Berger, Ch, Bernardi, G., Bertrand-Coremans, G., Besançon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Borras, K., Bottenveck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Brückner, W., Bruel, P., Bruncko, D., Brune, C., Buchholz, R., Büngener, L., Bürger, J., Büsser, F. W., Buniatian, A., Burke, S., Burton, M. J., Calvet, D., Campbell, A. J., Carli, T., Charlet, M., Clarke, D., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., Cousinou, M. -C, Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Dagoret, S., Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Roeck, A., Wolf, E. A., Delcourt, B., Dirkmann, M., Dixon, P., Dlugosz, W., Dollfus, C., Donovan, K. T., Dowell, J. D., Dreis, H. B., Droutskoi, A., Dünger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Elsen, E., Erdmann, M., Erdmann, W., Fahr, A. B., Favart, L., Fedotov, A., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flügge, G., Fomenko, A., Formánek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Genzel, H., Gerhards, R., Glazov, A., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grässler, H., Greenshaw, T., Griffiths, R. K., Grindhammer, G., Gruber, A., Gruber, C., Hadig, T., Haidt, D., Hajduk, L., Haller, T., Hampel, M., Haynes, W. J., Heinemann, B., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herynek, I., Hess, M. F., Hewitt, K., Hildesheim, W., Hiller, K. H., Hilton, C. D., Hladký, J., Höppner, M., Hoffmann, D., Holtom, T., Horisberger, R., Hudgson, V. L., Hütte, M., Ibbotson, M., Issever, C., Itterbeck, H., Jacholkowska, A., Jacobsson, C., Jacquet, M., Jaffre, M., Janoth, J., Jansen, D. M., Jansen, T., Jönsson, L., Johnson, D. P., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Kaufmann, H. H., Kaufmann, O., Kausch, M., Kazarian, S., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Köhler, T., Köhne, J. H., Kolanoski, H., Kolya, S. D., Korbel, V., Kostka, P., Kotelnikov, S. K., Krämerkämper, T., Krasny, M. W., Krehbiel, H., Krücker, D., Küster, H., Kuhlen, M., Kurča, T., Kurzhöfer, J., Laforge, B., Landon, M. P. J., Lange, W., Langenegger, U., Lebedev, A., Lehner, F., Lemaitre, V., Levonian, S., Lindström, G., Lindstroem, M., Linsel, F., Lipinski, J., List, B., Lobo, G., Loch, P., Lomas, J. W., Lopez, G. C., Lubimov, V., Lüke, D., Lytkin, L., Magnussen, N., Malinovski, E., Maraček, R., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, G., Martin, R., Martyn, H. -U, Martyniak, J., Mavroidis, T., Maxfield, S. J., Mcmahon, S. J., Mehta, A., Meier, K., Merkel, P., Metlica, F., Meyer, A., Meyer, H., Meyer, J., Meyer, P. -O, Migliori, A., Mikocki, S., Milstead, D., Moeck, J., Moreau, F., Morris, J. V., Mroczko, E., Müller, D., Müller, G., Müller, K., Murín, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, Th, Négri, I., Newman, P. R., Newton, D., Nguyen, H. K., Nicholls, T. C., Niebergall, F., Niebuhr, C., Niedzballa, Ch, Niggli, H., Nowak, G., Nunnemann, T., Nyberg-Werther, M., Oberlack, H., Olsson, J. E., Ozerov, D., Palmen, P., Panaro, E., Pahitch, A., Pascaud, C., Passaggio, S., Patel, G. D., Pawletta, H., Peppel, E., Perez, E., Phillips, J. P., Pieuchot, A., Pitzl, D., Pöschl, R., Pope, G., Povh, B., Prell, S., Rabbertz, K., Rädel, G., Reimer, P., Rick, H., Riess, S., Rizvi, E., Robmann, P., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Rüter, K., Rusakov, S., Rybicki, K., Sankey, D. P. C., Schacht, P., Schick, S., Schleif, S., Schleper, P., Schlippe, W., Schmidt, D., Schmidt, G., Schoeffel, L., Schöning, A., Schröder, V., Schuhmann, E., Schwab, B., Sefkow, F., Semenov, A., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., Sloan, T., Smirnov, P., Smith, M., Solochenko, V., Soloviev, Y., Specka, A., Spiekermann, J., Spielman, S., Spitzer, H., Squinabol, F., Steffen, P., Steinberg, R., Steiner, H., Steinhart, J., Stella, B., Stellberger, A., Stier, J., Stiewe, J., Stößlein, U., Stolze, K., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Taševský, M., Tchernyshov, V., Tchetchelnitski, S., Theissen, K. J., Thiebaux, C., Thompson, G., Tobien, N., Todenhagen, R., Truöl, P., Tsipolitis, G., Turnau, J., Tzamariudaki, E., Uelkes, P., Usik, A., Valkár, S., Alice Valkárová, Vallée, C., Esch, P., Mechelen, P., Vandenplas, D., Vazdik, Y., Verrecchia, P., Villet, G., Wacker, K., Wagener, A., Wagener, M., Waugh, B., Weber, G., Weber, M., Wegener, D., Wegner, A., Wengler, T., Werner, M., West, L. R., Wilksen, T., Willard, S., Winde, M., Winter, G. -G, Wittek, C., Wobisch, M., Wollatz, H., Wünsch, E., Žáček, J., Zarbock, D., Zhang, Z., Zhokin, A., Zini, P., Zomer, F., Zsembery, J., Zuber, K., Zurnedden, M., Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Diffraction, Particle physics, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Hadron, FOS: Physical sciences, HERA, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pomeron, 0103 physical sciences, Invariant mass, Rapidity, 010306 general physics, Low Mass
Abstract: A study is presented of the process gamma p -->XY, where there is a large rapidity gap between the systems X and Y. Measurements are made of the differential cross section as a function of the invariant mass mx of the system produced at the photon vertex. Results are presented at centre of mass energies of W_gp = 187 GeV and W_gp = 231 GeV, both where the proton dominantly remains intact and, for the first time, where it dissociates. Both the centre of mass energy and the mx^2 dependence of HERA data and those from a fixed target experiment may simultaneously be described in a triple-Regge model. The low mass photon dissociation process is found to be dominated by diffraction, though a sizable subleading contribution is present at larger masses. The pomeron intercept is extracted and found to be alpha_pom(0) = 1.068 \pm 0.016 (stat.) \pm 0.022 (syst.) \pm 0.041 (model), in good agreement with values obtained from total and elastic hadronic and photoproduction cross sections. The diffractive contribution to the process gamma p --> Xp with mx^2 / W_gp^2 < 0.05 is measured to be 22.2 \pm 0.6 (stat.) \pm 2.6 (syst.) \pm 1.7 (model) % of the total gamma p cross section at W_gp = 187 GeV., 29 pages, latex, 6 Figures

14. A search for squarks of Rp-violating SUSY at HERA

Author: Aid, S., Zsembery, J., Zuber, K., Zurnedden, M., Zimmer, M., Zomer, F., Zhokin, A., Zarbock, D., Zhiqing Zhang, Wunsch, E., Zacek, J., Yiou, T. P., Wittek, C., G Winter, G., Winde, M., Willard, S., Wilksen, T., Wellisch, H. P., West, L. R., Wegener, D., Wegner, A., Weber, M., Weber, G., Waugh, B., Walther, A., Wagener, M., Wagener, A., Wacker, K., Villet, G., Verrecchia, P., Vazdik, Y., Mechelen, P., Esch, P., Vandenplas, D., Vallee, C., Valkarova, A., Usik, A., Valkar, S., Tutas, J., Uelkes, P., Turnau, J., Truol, P., Thiebaux, C., Thompson, G., Theissen, J., Tchernyshov, V., Tchetchelnitski, S., Stolze, K., Tapprogge, S., Tasevsky, M., Straumann, U., Struczinski, W., Sutton, P., Stier, J., Stiewe, J., Stosslein, U., Steiner, H., Stella, B., Steffen, P., Steinberg, R., Steenbock, M., Squinabol, F., Starosta, R., Spiekermann, J., Spielman, S., Spitzer, H., Specka, A., Soloviev, Y., Solochenko, V., Smith, J. R., Smirnov, P., Sirois, Y., Skillicorn, I. O., Siewert, U., Sell, R., Shekelyan, V., Sheviakov, I., Shtarkov, L. N., Siegmon, G., Seidel, M., Sefkow, F., Schwab, B., Schumann, E., Schroder, V., Schmidt, G., Schoning, A., Semenov, A., Schmidt, D., Schlippe, W., Schleper, P., Schleif, S., Schiek, S., Schacht, P., Sankey, D. P. C., Sahlmann, N., Rybicki, K., Ruter, K., Rusakov, S., Rostovtsev, A., Rouse, F., Royon, C., Rosenbauer, K., Roosen, R., Roloff, H. E., Robmann, P., Robertson, S. M., Rizvi, E., Rietz, M., Riess, S., Riepenhausen, F., Riedlberger, J., Riech, V., Rick, H., Reinshagen, S., Reimer, P., Raupach, F., Radel, G., Prosi, R., Rabbertz, K., Prell, S., Pieuchot, A., Pitzl, D., Phillips, J. P., Perez, E., Pawletta, H., Peppel, E., Patel, G. D., Panitch, A., Pascaud, C., Panaro, E., Palmen, P., Ozerov, D., Obrock, U., Oakden, M., Oberlack, H., Olsson, J. E., Nyberg-Werther, M., Noyes, G. W., Nowak, G., Niggli, H., Nisius, R., Ch. Niedzballa, Niebuhr, C., Niebergall, F., Nicholls, T. C., Nguyen, H. K., Neyret, D., Newton, D., Newman, P. E., Th. Naumann, Naroska, B., Nahnhauer, R., Nagovizin, V., Murin, P., Muller, K., Muller, G., Muller, D., Mroczko, E., Morris, J. V., Moreau, F., Moeck, J., Milstead, D., Mikocki, S., Migliori, A., O Meyer, P., Meyer, H., Meyer, J., Merz, T., Meyer, A., Mehta, A., Meier, K., Maxfield, S. J., Mcmahon, S. J., Mavroidis, T., U Martyn, H., Martyniak, J., Masson, S., Martin, G., Roland Martin, Marshall, R., Martens, J., Marks, J., Maracek, R., Marage, P., Mani, S., Malinovski, E., Magnussen, N., Luke, D., Lubimov, V., Lopez, G. C., Lobo, G., Loch, P., Lohmander, H., Lomas, J. W., List, B., Link, J., Linsel, F., Lipinski, J., Levonian, S., Ch. Ley, Lindstrom, G., Lindstroem, M., Leverenz, C., F Laporte, J., Lebedev, A., Lehner, F., Langenegger, U., Lanius, P., Lange, W., Landon, M. P. J., Lamarche, F., Lander, R., Lacour, D., Laforge, B., Kurzhofer, J., Kurca, T., Kuster, H., Kuhlen, M., Kruger, U., Kruner-Marquis, U., Krucker, D., Krehbiel, H., Krasny, M. W., Kramerkamper, T., Kostka, P., Kotelnikov, S. K., Kolya, S. D., Korbel, V., Korn, M., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kohne, J. H., Kolanoski, H., Kole, F., Kaufmann, H. H., Kazarian, S., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kander, M., Kant, D., Kaschowitz, R., Kathage, U., Katzy, J., Jonsson, L., Johannsen, K., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., A Jabiol, M., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Holtom, T., Horisberger, R., Hoffmann, D., Hoppner, M., Hoeger, K. C., Hladky, J., Hilton, C. D., Hiller, H., Hildesheim, W., Hess, M. F., Herynek, I., Andreev, V., Andrieu, B., D Appuhn, R., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Ban, Y., Baranov, P., Barrelet, E., Barschke, R., Bartel, W., Barth, M., Bassler, U., Beck, H. P., J Behred, H., Belousov, A., Ch. Berger, Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bispham, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Buniatian, A., Burke, S., Burton, M. J., Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Charlet, M., Clarke, D., Clegg, A. B., Clerbaux, B., Cocks, S., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., C Cousinou, M., Ch. Coutures, Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Sylvie DAGORET, Dainton, J. B., Dau, W. D., Daum, K., David, M., Davis, C. L., Delcourt, B., Del Buono, L., Roeck, A., Wolf, E. A., Dirkmann, M., Dixon, P., Di Nezza, P., Dlugosz, W., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, A., Duboc, J., Dullmann, D., Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Egli, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Fahr, A. B., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gaede, F., Garvey, J., Gayler, J., Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Glazov, A., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Golec-Biernat, K., Gonzalez-Pineiro, B., Gorelov, I., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Griffiths, R., Grindhammer, G., Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hapke, M., Haynes, W. J., Heinzelmann, J., Henderson, R. C. W., Henschel, H., Hudgson, V. L., Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), H1, Kerec, Hélène, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics and Astronomy (miscellaneous), FOS: Physical sciences, Lambda, 01 natural sciences, High Energy Physics - Experiment, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Coupling, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Yukawa potential, HERA, Supersymmetry, Coupling (probability), Pair production, High Energy Physics::Experiment, Production (computer science), Free parameter, Minimal Supersymmetric Standard Model
Abstract: A search for squarks of R-parity violating supersymmetry is performed in $ep$ collisions at HERA using H1 1994 $e^+$ data. Direct single production of squarks of each generation by $e^+$-quark fusion via a Yukawa coupling $\lambda'$ is considered. All possible R-parity violating decays and gauge decays of the squarks are taken into account. No significant deviation from the Standard Model predictions is found in the various multi-lepton and multi-jet final states studied and exclusion limits are derived. At 95% confidence level, the existence of first generation squarks is excluded for masses up to $240 \GeV $ for coupling values $\lambda' \gtrsim \sqrt{4\pi \alpha_{em}}$.The limits obtained are shown to be only weakly dependent on the free parameters of the Minimal Supersymmetric Standard Model. Stop squarks are excluded for masses up to $138 \GeV$ for coupling $\lambda' \times \cos \theta_t$ to $e^+d$ pairs $\gtrsim 0.1 \times \sqrt{4\pi \alpha_{em}}$, where $\theta_t$ is the mass mixing angle. Light stop squarks are furthermore searched for through pair production in $\gamma$-gluon fusion processes. No signal is observed and exclusion limits are derived. Masses in the range 9 to $24.4 \GeV$ are excluded at 95% confidence level for $\lambda' \times \cos \theta_t > 10^{-4}$., Comment: 31 pages, latex, 11 Figures

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14 results on '"Nguyen, H. K."'

1. Bose-Einstein correlations in deep inelastic $ep$ scattering at HERA

2. Hadron Production in Diffractive Deep-Inelastic Scattering

3. Evolution of ep Fragmentation and Multiplicity Distributions in the Breit Frame

4. Measurement of Event Shape Variables in Deep Inelastic $e^{+}p$ Scattering

5. Energy Flow in the Hadronic Final State of Diffractive and Non-Diffractive Deep-Inelastic Scattering at HERA

6. A Measurement and QCD Analysis of the Proton Structure Function $F_2(x,Q^2)$ at HERA

7. Elastic photoproduction of $\rho^{0}$ mesons at HERA

8. Charged particle multiplicities in deep inelastic scattering at HERA

9. Elastic and inelastic photoproduction of J/$\psi$ mesons at HERA

10. A search for selectrons and squarks at HERA

11. Forward π○-meson production at HERA

12. Strangeness production in deep-inelastic positron-proton scattering at HERA

13. Diffraction dissociation in photoproduction at HERA

14. A search for squarks of Rp-violating SUSY at HERA

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14 results on '"Nguyen, H. K."'

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