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1. Measurement of azimuthal asymmetries in deep inelastic scattering

Author: Breitweg, J, Chekanov, S, Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Pellegrino, A, Repond, J, Stanek, R, Yoshida, R, Mattingly, M C K, Abbiendi, G, Anselmo, F, Antonioli, P, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Romeo, G C, Castellini, G, Cifarelli, L, Cindolo, F, Contin, A, Coppola, N, Corradi, M, De Pasquale, S, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Margotti, A, Massam, T, Nania, R, Palmonari, F, Pesci, A, Polini, A, Sartorelli, G, Garcia, Y Z, Zichichi, A, Amelung, C, Bornheim, A, Brock, I, Coboken, K, Crittenden, J, Deffner, R, Hartmann, H, Heinloth, K, Hilger, E, Irrgang, P, Jakob, H P, Kappes, A, Katz, U F, Kerger, R, Paul, E, Schnurbusch, H, Stifutkin, A, Tandler, J, Voss, K C, Weber, A, Wieber, H, Bailey, D S, Barret, O, Brook, N H, Foster, B, Heath, G P, Heath, H F, McFall, J D, Piccioni, D, Rodrigues, E, Scott, J, Tapper, R J, Capua, M, Mastroberardino, A, Schioppa, M, Susinno, G, Jeoung, H Y, Kim, J Y, Lee, J H, Lim, I T, Ma, K J, Pac, M Y, Caldwell, A, Liu, W, Liu, X, Mellado, B, Paganis, S, Sampson, S, Schmidke, W B, Sciulli, F, Chwastowski, J, Eskreys, A, Figiel, J, Klimek, K, Olkiewicz, K, Piotrzkowski, K, Przybycien, M B, Stopa, P, Zawiejski, L, Bednarek, B, Jelen, K, Kisielewska, D, Kowal, A M, Kowalski, T, Przybycien, M, Rulikowska-Zarebska, E, Suszycki, L, Szuba, D, Kotanski, A, Bauerdick, L A T, Behrens, U, Bienlein, J K, Burgard, C, Dannheim, D, Desler, K, Drews, G, Fox-Murphy, A, Fricke, U, Goebel, F, Gottlicher, P, Graciani, R, Haas, T, Hain, W, Hartner, G F, Hasell, D, Hebbel, K, Johnson, K F, Kasemann, M, Koch, W, Kotz, U, Kowalski, H, Lindemann, L, Lohr, B, Martinez, M, Milite, M, Monteiro, T, Moritz, M, Notz, D, Pelucchi, F, Petrucci, M C, Rohde, M, Saull, P R B, Savin, A A, Schneekloth, U, Selonke, F, Sievers, M, Stonjek, S, Tassi, E, Wolf, G, Wollmer, U, Youngman, C, Zeuner, W, Coldewey, C, Viani, A L D, Meyer, A, Schlenstedt, S, Straub, P B, Barbagli, G, Gallo, E, Pelfer, P, Maccarrone, G, Votano, L, Bamberger, A, Benen, A, Eisenhardt, S, Markun, P, Raach, H, Wolfle, S, Bussey, P J, Doyle, A T, Lee, S W, Macdonald, N, McCance, G J, Saxon, D H, Sinclair, L E, Skillicorn, I O, Waugh, R, Bohnet, I, Gendner, N, Holm, U, Meyer-Larsen, A, Salehi, H, Wick, K, Garfagnini, A, Gialas, I, Gladilin, L K, Kcira, D, Klanner, R, Lohrmann, E, Poelz, G, Zetsche, F, Goncalo, R, Long, K R, Miller, D B, Tapper, A D, Walker, R, Mallik, U, Cloth, P, Filges, D, Ishii, T, Kuze, M, Nagano, K, Tokushuku, K, Yamada, S, Yamazaki, Y, Ahn, S H, Lee, S B, Park, S K, Lim, H, Park, I H, Son, D, Barreiro, F, Garcia, G, Glasman, C, Gonzalez, O, Labarga, L, del Peso, J, Redondo, I, Terron, J, Barbi, M, Corriveau, F, Hanna, D S, Ochs, A, Padhi, S, Riveline, M, Stairs, D G, Wing, M, Tsurugai, T, Bashkirov, V, Dolgoshein, B A, Dementiev, R K, Ermolov, P F, Golubkov, Y A, Katkov, I I, Khein, L A, Korotkova, N A, Korzhavina, I A, Kuzmin, V A, Lukina, O Y, Proskuryakov, A S, Shcheglova, L M, Solomin, A N, Vlasov, N N, Zotkin, S A, Bokel, C, Botje, M, Brummer, N, Engelen, J, Grijpink, S, Koffeman, E, Kooijman, P, Schagen, S, van Sighem, A, Tiecke, H, Tuning, N, Velthuis, J J, Vossebeld, J, Wiggers, L, de Wolf, E, Acosta, D, Bylsma, B, Durkin, L S, Gilmore, J, Ginsburg, C M, Kim, C L, Ling, T Y, Boogert, S, Cooper-Sarkar, A M, Devenish, R C E, Grobe-Knetter, J, Matsushita, T, Ruske, O, Sutton, M R, Walczak, R, Bertolin, A, Brugnera, R, Carlin, R, Dal Corso, F, Dosselli, U, Dusini, S, Limentani, S, Morandin, M, Posocco, P, Stanco, L, Stroili, R, Voci, C, Adamczyk, L, Iannotti, L, Oh, B Y, Okrasinski, J R, Toothacker, W S, Whitmore, J J, Iga, Y, D'Agostini, G, Marini, G, Nigro, A, Cormack, C, Hart, J C, McCubbin, N A, Shah, T P, Epperson, D, Heusch, C, Sadrozinski, H F W, Seiden, A, Wichmann, R, Williams, D C, Pavel, N, Abramowicz, H, Dagan, S, Kananov, S, Kreisel, A, Levy, A, Abe, T, Fusayasu, T, Umemori, K, Yamashita, T, Hamatsu, R, Hirose, T, Inuzuka, M, Kitamura, S, Nishimura, T, Arneodo, M, Cartiglia, N, Cirio, R, Costa, M, Ferrero, M I, Maselli, S, Monaco, V, Peroni, C, Ruspa, M, Sacchi, R, Solano, A, Staiano, A, Dardo, M, Bailey, D C, Fagerstroem, C P, Galea, R, Koop, T, Levman, G M, Martin, J F, Orr, R S, Polenz, S, Sabetfakhri, A, Simmons, D, Butterworth, J M, Catterall, C D, Hayes, M E, Heaphy, E A, Jones, T W, Lane, J B, West, B J, Ciborowski, J, Ciesielski, R, Grzelak, G, Nowak, R J, Pawlak, J M, Pawlak, R, Smalska, B, Tymieniecka, T, Wroblewski, A K, Zakrzewski, J A, Zarnecki, A F, Adamus, M, Gadaj, T, Deppe, O, Eisenberg, Y, Hochman, D, Karshon, U, Badgett, W F, Chapin, D, Cross, R, Foudas, C, Mattingly, S, Reeder, D D, Smith, W H, Vaiciulis, A, Wildschek, T, Wodarczyk, M, Deshpande, A, Dhawan, S, Hughes, V W, Bhadra, S, Catterall, C, Cole, J E, Frisken, W R, Hall-Wilton, R, Khakzad, M, Menary, S, and ZEUS Collaboration
Subjects: Nuclear and High Energy Physics, Particle physics, MONTE-CARLO GENERATOR, ENERGIES, HERA, Nuclear Theory, FOS: Physical sciences, Inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, CROSS-SECTIONS, Nuclear physics, High Energy Physics - Experiment (hep-ex), LEPTOPRODUCTION, 0103 physical sciences, DISTRIBUTIONS, Nuclear Experiment, 010306 general physics, QC, Physics, Quantum chromodynamics, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), Neutral current, Faculty of Science\Physics, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Perturbative QCD, ZEUS, LEPTON-PROTON SCATTERING, Deep inelastic scattering, QCD, High Energy Physics::Experiment
Abstract: The distribution of the azimuthal angle for the charged hadrons has been studied in the hadronic centre-of-mass system for neutral current deep inelastic positron-proton scattering with the ZEUS detector at HERA. Measurements of the dependence of the moments of this distribution on the transverse momenta of the charged hadrons are presented. Asymmetries that can be unambiguously attributed to perturbative QCD processes have been observed for the first time., Comment: 19 pages - 4 figures. Included referee's comments
Published: 2000
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2. Measurement of high-$Q^2$ charged-current $e^+p$ deep inelastic scattering cross sections at HERA

Author: Breitweg, J., Chekanov, S., Derrick, M., Krakauer, D., Magill, S., Musgrave, B., Pellegrino, A., Repond, J., Stanek, R., Yoshida, R., Mattingly, M. C. K., Abbiendi, G., Anselmo, F., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Cara Romeo, G., Guido Castellini, Cifarelli, L., Cindolo, F., Contin, A., Coppola, N., Corradi, M., Pasquale, S., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Pesci, A., Polini, A., Sartorelli, G., Zamora Garcia, Y., Zichichi, A., Amelung, C., Bornheim, A., Brock, I., Coböken, K., Crittenden, J., Deffner, R., Eckert, M., Hartmann, H., Heinloth, K., Hilger, E., Jakob, H. -P, Kappes, A., Katz, U. F., Kerger, R., Paul, E., Rautenberg, J., Schnurbusch, H., Stifutkin, A., Tandler, J., Weber, A., Wieber, H., Bailey, D. S., Barret, O., Cottingham, W. N., Foster, B., Heath, G. P., Heath, H. F., Mcfall, J. D., Piccioni, D., Scott, J., Tapper, R. J., Capua, M., Mastroberardino, A., Schioppa, M., Susinno, G., Jeoung, H. Y., Kim, J. Y., Lee, J. H., Lim, I. T., Ma, K. J., Pac, M. Y., Caldwell, A., Cartiglia, N., Jing, Z., Liu, W., Mellado, B., Parsons, J. A., Ritz, S., Sacchi, R., Sampson, S., Sciulli, F., Zhu, Q., Chwastowski, J., Eskreys, A., Figiel, J., Klimek, K., Olkiewicz, K., Przybycień, M. B., Stopa, P., Zawiejski, L., Adamczyk, L., Bednarek, B., Jeleń, K., Kisielewska, D., Kowal, A. M., Kowalski, T., Przybycień, M., Rulikowska-Zarebska, E., Suszycki, L., Zajac, J., Dulinński, Z., Kotanński, A., Bauerdick, L. A. T., Behrens, U., Bienlein, J. K., Burgard, C., Desler, K., Drews, G., Fox-Murphy, A., Fricke, U., Goebel, F., Göttlicher, P., Graciani, R., Haas, T., Hain, W., Hartner, G. F., Hasell, D., Hebbel, K., Johnson, K. F., Kasemann, M., Koch, W., Kötz, U., Kowalski, H., Lindemann, L., Löhr, B., Martinez, M., Milewski, J., Milite, M., Monteiro, T., Moritz, M., Notz, D., Pelucchi, F., Piotrzkowski, K., Rohde, M., Saull, P. R. B., Savin, A. A., Schneekloth, U., Schwarzer, O., Selonke, F., Sievers, M., Stonjek, S., Tassi, E., Wolf, G., Wollmer, U., Youngman, C., Zeuner, W., Burow, B. D., Coldewey, C., Grabosch, H. J., Lopez-Duran Viani, A., Meyer, A., Mönig, K., Schlenstedt, S., Straub, P. B., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, G., Votano, L., Bamberger, A., Eisenhardt, S., Markun, P., Raach, H., Wölfle, S., Brook, N. H., Bussey, P. J., Doyle, A. T., Lee, S. W., Macdonald, N., Mccance, G. J., Saxon, D. H., Sinclair, L. E., Skillicorn, I. O., Strickland, E., Waugh, R., Bohnet, I., Gendner, N., Holm, U., Meyer-Larsen, A., Salehi, H., Wick, K., Garfagnini, A., Gialas, I., Gladilin, L. K., Kçira, D., Klanner, R., Lohrmann, E., Poelz, G., Zetsche, F., Bacon, T. C., Cole, J. E., Howell, G., Lamberti, L., Long, K. R., Miller, D. B., Prinias, A., Sedgbeer, J. K., Sideris, D., Tapper, A. D., Walker, R., Mallik, U., Wang, S. M., Cloth, P., Filges, D., Ishii, T., Kuze, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamauchi, K., Yamazaki, Y., Ahn, S. H., An, S. H., Hong, S. J., Lee, S. B., Nam, S. W., Park, S. K., Lim, H., Park, I. H., Son, D., Barreiro, F., Fernandez, J. P., Garcia, G., Glasman, C., Hernández, J. M., Labarga, L., Del Peso, J., Puga, J., Redondo, I., Terrón, J., Corriveau, F., Hanna, D. S., Hartmann, J., Murray, W. N., Ochs, A., Padhi, S., Riveline, M., Stairs, D. G., St-Laurent, M., Wing, M., Tsurugai, T., Bashkirov, V., Dolgoshein, B. A., Bashindzhagyan, G. L., Ermolov, P. F., Golubkov, Y. A., Khein, L. A., Korotkova, N. A., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Y., Proskuryakov, A. S., Shcheglova, L. M., Solomin, A. N., Zotkin, S. A., Bokel, C., Botje, M., Brümmer, N., Engelen, J., Koffeman, E., Kooijman, P., Sighem, A., Tiecke, H., Tuning, N., Velthuis, J. J., Verkerke, W., Vossebeld, J., Wiggers, L., Wolf, E., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Ginsburg, C. M., Kim, C. L., Ling, T. Y., Nylander, P., Blaikley, H. E., Boogert, S., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Edmonds, J. K., Große-Knetter, J., Harnew, N., Matsushita, T., Noyes, V. A., Quadt, A., Ruske, O., Sutton, M. R., Walczak, R., Waters, D. S., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Dondana, S., Dosselli, U., Dusini, S., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Iannotti, L., Oh, B. Y., Okrasiński, J. R., Toothacker, W. S., Whitmore, J. J., Iga, Y., D Agostini, G., Marini, G., Nigro, A., Raso, M., Cormack, C., Hart, J. C., Mccubbin, N. A., Shah, T. P., Epperson, D., Heusch, C., Sadrozinski, H. F. -W, Seiden, A., Wichmann, R., Williams, D. C., Pavel, N., Abramowicz, H., Dagan, S., Kananov, S., Kreisel, A., Levy, A., Abe, T., Fusayasu, T., Inuzuka, M., Nagano, K., Umemori, K., Yamashita, T., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nishimura, T., Arneodo, M., Cirio, R., Costa, M., Ferrero, M. I., Maselli, S., Monaco, V., Peroni, C., Petrucci, M. C., Ruspa, M., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Fagerstroem, C. -P, Galea, R., Koop, T., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sabetfakhri, A., Simmons, D., Butterworth, J. M., Catterall, C. D., Hayes, M. E., Heaphy, E. A., Jones, T. W., Lane, J. B., West, B. J., Ciborowski, J., Ciesielski, R., Grzelak, G., Nowak, R. J., Pawlak, J. M., Pawlak, R., Smalska, B., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Gadaj, T., Deppe, O., Eisenberg, Y., Hochman, D., Karshon, U., Badgett, W. F., Chapin, D., Cross, R., Foudas, C., Mattingly, S., Reeder, D. D., Smith, W. H., Vaiciulis, A., Wildschek, T., Wodarczyk, M., Deshpande, A., Dhawan, S., Hughes, V. W., Bhadra, S., Frisken, W. R., Hall-Wilton, R., Khakzad, M., Menary, S., Schmidke, W. B., and Zeus (IHEF, IoP, FNWI)
Subjects: Particle physics, MONTE-CARLO GENERATOR, Physics and Astronomy (miscellaneous), FOS: Physical sciences, Weak interaction, Inelastic scattering, PROTON SCATTERING, 01 natural sciences, 7. Clean energy, JET FRAGMENTATION, High Energy Physics - Experiment, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), ZEUS, CENTRAL TRACKING DETECTOR, ZEUS BARREL CALORIMETER, RADIATIVE-CORRECTIONS, PARTON DISTRIBUTIONS, NUCLEON SCATTERING, BOSON PRODUCTION, EVENT GENERATOR, 0103 physical sciences, 010306 general physics, Engineering (miscellaneous), Event generator, Physics, Research Groups and Centres\Physics\Low Temperature Physics, Neutral current, 010308 nuclear & particles physics, Faculty of Science\Physics, HERA, Deep inelastic scattering, Energy (signal processing)
Abstract: The e^+p charged-current deep inelastic scattering cross sections, $d\sigma/dQ^2$ for Q^2 between 200 and 60000 GeV^2, and $d\sigma/dx$ and $d\sigma/dy$ for Q^2 > 200 GeV^2, have been measured with the ZEUS detector at HERA. A data sample of 47.7 pb^-1, collected at a center-of-mass energy of 300 GeV, has been used. The cross section $d\sigma/dQ^2$ falls by a factor of about 50000 as Q^2 increases from 280 to 30000 GeV^2. The double differential cross section $d^2\sigma/dxdQ^2$ has also been measured. A comparison between the data and Standard Model (SM) predictions shows that contributions from antiquarks ($\bar{u}$ and $\bar{c}$) and quarks (d and s) are both required by the data. The predictions of the SM give a good description of the full body of the data presented here. A comparison of the charged-current cross section $d\sigma/dQ^2$ with the recent ZEUS results for neutral-current scattering shows that the weak and electromagnetic forces have similar strengths for Q^2 above $M^2_W, M^2_Z$. A fit to the data for $d\sigma/dQ^2$ with the Fermi constant $G_F$ and $M_W$ as free parameters yields $G_F = (1.171 \pm 0.034 (stat.) ^{+0.026}_{-0.032} (syst.) ^{+0.016}_{-0.015} (PDF)) \times 10^{-5} GeV^{-2}$ and $M_W = 80.8 ^{+4.9}_{-4.5} (stat.) ^{+5.0}_{-4.3} (syst.) ^{+1.4}_{-1.3} (PDF) GeV$. Results for $M_W$, where the propagator effect alone or the SM constraint between $G_F$ and $M_W$ have been considered, are also presented., Comment: 34 pages including 10 figures and 6 tables; added tables for correlated and uncorrelated systematic uncertainties and fixed the total systematic uncertainty for dsigma/dxdQ2 (Table 4 and Figs.7-8); erratum submitted to Eur. Phys. J
Published: 2000
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3. Observation of jet production in deep inelastic scattering with a large rapidity gap at HERA

Author: David Bailey, Derrick, M., Krakauer, D., Magill, S., Musgrave, B., Repond, J., Schlereth, J., Stanek, R., Talaga, R. L., Thron, J., Arzarello, F., Ayad, R., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Chiarini, M., Cifarelli, L., Cindolo, F., Ciralli, F., Contin, A., Auria, S. D., Del Papa, C., Frasconi, F., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Maccarrone, G., Margotti, A., Massam, T., Nania, R., Nemoz, C., Palmonari, F., Sartorelli, G., Timellini, R., Zamora Garcia, Y., Zichichi, A., Bargende, A., Crittenden, J., Desch, K., Diekmann, B., Doeker, T., Feld, L., Frey, A., Geerts, M., Geitz, G., Hartmann, H., Haun, D., Heinloth, K., Hilger, E., Jakob, H. P., Katz, U. F., Kramarczyk, S., Mass, A., Mengel, S., Mollen, J., Paul, E., Ch Rembser, Schattevoy, R., Schneider, J. L., Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Dyce, N., Foster, B., George, S., Gilmore, R., Heath, G. P., Heath, H. F., Llewellyn, T. J., Morgado, C. J. S., Norman, D. J. P., Mara, J. A. O., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, M., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Gialas, I., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Eskreys, K., Jeleń, K., Kisielewska, D., Kowalski, T., Rulikowska-Zarȩbska, E., Suszycki, L., Zaja̧c, J., Kȩdzierski, T., Kotański, A., Przybycień, M., Bauerdick, L. A. T., Behrens, U., Bienlein, J. K., Böttcher, S., Coldewey, C., Drews, G., Flasiński, M., Fleck, I., Gilkinson, D. J., Göttlicher, P., Gutjahr, B., Haas, T., Hagge, L., Hain, W., Hasell, D., Heßling, H., Hultschig, H., Joos, P., Kasemann, M., Klanner, R., Koch, W., Köpke, L., Kötz, U., Kowalski, H., Kröger, W., Krüger, J., Labs, J., Ladage, A., Löhr, B., Löwe, M., Lüke, D., Mainusch, J., Mańczak, O., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Rohde, M., Roldán, J., Schneekloth, U., Schroeder, J., Schulz, W., Selonke, F., Stiliaris, E., Tsurugai, T., Vogel, W., Westphal, D., Wolf, G., Youngman, C., Grabosch, H. J., Leich, A., Meyer, A., Rethfeldt, C., Schlenstedt, S., Barbagli, G., Nuti, M., Pelfer, P., Anzivino, G., Pasquale, S., Qian, S., Votano, L., Bamberger, A., Freidhof, A., Poser, T., Stefan Soldner-Rembold, Theisen, G., Trefzger, T., Brook, N. H., Bussey, P. J., Doyle, A. T., Forbes, J. R., Jamieson, V. A., Raine, C., Saxon, D. H., Stavrianakou, M., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Kammerlocher, H., Krebs, B., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Fürtjes, A., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Terron, J., Zetsche, F., Bacon, T. C., Beuselinck, R., Butterworth, I., Gallo, E., Harris, V. L., Long, K. R., Miller, D. B., Morawitz, P., Prinias, A., Sedgbeer, J. K., Vorvolakos, A., Whitfield, A., Bienz, T., Kreutzmann, H., Mallik, U., Mccliment, E., Roco, M., Wang, M. Z., Cloth, P., Filges, D., An, S. H., Hong, S. M., Kim, C. O., Kim, T. Y., Nam, S. W., Park, S. K., Suh, M. H., Yon, S. H., Imlay, R., Kartik, S., Kim, H. J., Mcneil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Graciani, R., Hernández, J. M., Hervás, L., Labarga, L., Del Peso, J., Puga, J., Trocóniz, J. F., Ikraiam, F., Mayer, J. K., Smith, G. R., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Mitchell, J. W., Patel, P. M., Sinclair, L. E., Stairs, D. G., St Laurent, M., Ullmann, R., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Y. A., Kobrin, V. D., Kuzmin, V. A., Kuznetsov, E. N., Savin, A. A., Solomin, A. N., Voronin, A. G., Zotov, N. P., Bentvelsen, S., Botje, M., Chlebana, F., Dake, A., Engelen, J., Jong, P., Kamps, M., Kooijman, P., Kruse, A., V. O'Dell, Tenner, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., Wolf, E., Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Honscheid, K., Li, C., Ling, T. Y., Mclean, K. W., Murray, W. N., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, D. S., Blair, G. A., Byrne, A., Cashmore, R. J., Cooper-Sarkar, A. M., Daniels, D., Devenish, R. C. E., Harnew, N., Lancaster, M., Luffman, P. E., Mcfall, J., Nath, C., Quadt, A., Uijterwaal, H., Walczak, R., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Giorgi, M., Dosselli, U., Gasparini, F., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Whitmore, J. J., Agostini, G. D., Guida, M., Iori, M., Mari, S. M., Marini, G., Mattioli, M., Nigro, A., Hart, J. C., Mccubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Cartiglia, N., Heusch, C., Hook, M., Hubbard, B., Lockman, W., Sadrozinski, H. F. W., Seiden, A., Zer-Zion, D., Biltzinger, J., Seifert, R. J., Walenta, A. H., Zech, G., Abramowicz, H., Dagan, S., Levy, A., Hasegawa, T., Hazumi, M., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nagira, T., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nagayama, S., Nakamitsu, Y., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Bandyopadhyay, D., Benard, F., Bhadra, S., Brkic, M., Crombie, M. B., Gingrich, D. M., Hartner, G. F., Levman, G. M., Martin, J. F., Orr, R. S., Sampson, C. R., Teuscher, R. J., Bullock, F. W., Catterall, C. D., Giddings, J. C., Jones, T. W., Khan, A. M., Lane, J. B., Makkar, P. L., Shaw, D., Shulman, J., Blankenship, K., Kochocki, J., Lu, B., Mo, L. W., Bogusz, W., Charchuła, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Eisenberg, Y., Glasman, C., Karshon, U., Revel, D., Shapira, A., Ali, I., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Frisken, W. R., Furutani, K. M., Iga, Y., Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Repond, J, Schlereth, J, Stanek, R, Talaga, Rl, Thron, J, Arzarello, F, Ayad, R, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Bruni, P, Romeo, Gc, Castellini, G, Chiarini, M, Cifarelli, L, Cindolo, F, Ciralli, F, Contin, A, Dauria, S, Delpapa, C, Frasconi, F, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Maccarrone, G, Margotti, A, Massam, T, Nania, R, Nemoz, C, Palmonari, F, Sartorelli, G, Timellini, R, Garcia, Yz, Zichichi, A, Bargende, A, Crittenden, J, Desch, K, Diekmann, B, Doeker, T, Feld, L, Frey, A, Geerts, M, Geitz, G, Hartmann, H, Haun, D, Heinloth, K, Hilger, E, Jakob, Hp, Katz, Uf, Kramarczyk, S, Mass, A, Mengel, S, Mollen, J, Paul, E, Rembser, C, Schattevoy, R, Schneider, Jl, Schramm, D, Stamm, J, Wedemeyer, R, Campbellrobson, S, Cassidy, A, Dyce, N, Foster, B, George, S, Gilmore, R, Heath, Gp, Heath, Hf, Llewellyn, Tj, Morgado, Cj, Norman, Djp, Omara, Ja, Tapper, Rj, Wilson, S, Yoshida, R, Rau, Rr, Arneodo, M, Schioppa, M, Susinno, G, Bernstein, A, Caldwell, A, Gialas, I, Parsons, Ja, Ritz, S, Sciulli, F, Straub, Pb, Wai, L, Yang, S, Borzemski, P, Chwastowski, J, Eskreys, A, Piotrzkowski, K, Zachara, M, Zawiejski, L, Adamczyk, L, Bednarek, B, Eskreys, K, Jelen, K, Kisielewska, D, Kowalski, T, Rulikowskazarebska, E, Suszycki, L, Zajac, J, Kedzierski, T, Kotanski, A, Przybycien, M, Bauerdick, Lat, Behrens, U, Bienlein, Jk, Bottcher, S, Coldewey, C, Drews, G, Flasinski, M, Fleck, I, Gilkinson, Dj, Gottlicher, P, Gutjahr, B, Haas, T, Hagge, L, Hain, W, Hasell, D, Hessling, H, Hultschig, H, Joos, P, Kasemann, M, Klanner, R, Koch, W, Kopke, L, Kotz, U, Kowalski, H, Kroger, W, Kruger, J, Labs, J, Ladage, A, Lohr, B, Lowe, M, Luke, D, Mainusch, J, Manczak, O, Ng, Jst, Nickel, S, Notz, D, Ohrenberg, K, Rohde, M, Roldan, J, Schneekloth, U, Schroeder, J, Schulz, W, Selonke, F, Stiliaris, E, Tsurugai, T, Vogel, W, Westphal, D, Wolf, G, Youngman, C, Grabosch, Hj, Leich, A, Meyer, A, Rethfeldt, C, Schlenstedt, S, Barbagli, G, Nuti, M, Pelfer, P, Anzivino, G, Depasquale, S, Qian, S, Votano, L, Bamberger, A, Freidhof, A, Poser, T, Soldnerrembold, S, Theisen, G, Trefzger, T, Brook, Nh, Bussey, Pj, Doyle, At, Forbes, Jr, Jamieson, Va, Raine, C, Saxon, Dh, Stavrianakou, M, Wilson, A, Dannemann, A, Holm, U, Horstmann, D, Kammerlocher, H, Krebs, B, Neumann, T, Sinkus, R, Wick, K, Badura, E, Burow, Bd, Furtjes, A, Lohrmann, E, Milewski, J, Nakahata, M, Pavel, N, Poelz, G, Schott, W, Terron, J, Zetsche, F, Bacon, Tc, Beuselinck, R, Butterworth, I, Gallo, E, Harris, Vl, Long, Kr, Miller, Db, Morawitz, P, Prinias, A, Sedgbeer, Jk, Vorvolakos, A, Whitfield, A, Bienz, T, Kreutzmann, H, Mallik, U, Mccliment, E, Roco, M, Wang, Mz, Cloth, P, Filges, D, An, Sh, Hong, S, Kim, Co, Kim, Ty, Nam, Sw, Park, Sk, Suh, Mh, Yon, Sh, Imlay, R, Kartik, S, Kim, Hj, Mcneil, Rr, Metcalf, W, Nadendla, Vk, Barreiro, F, Cases, G, Graciani, R, Hernandez, Jm, Hervas, L, Labarga, L, Delpeso, J, Puga, J, Detroconiz, Jf, Ikraiam, F, Mayer, Jk, Smith, Gr, Corriveau, F, Hanna, D, Hartmann, J, Hung, Lw, Lim, Jn, Matthews, Cg, Mitchell, Jw, Patel, Pm, Sinclair, Le, Stairs, Dg, Stlaurent, M, Ullmann, R, Bashkirov, V, Dolgoshein, Ba, Stifutkin, A, Bashindzhagyan, Gl, Ermolov, Pf, Gladilin, Lk, Golubkov, Ya, Kobrin, Vd, Kuzmin, Va, Kuznetsov, En, Savin, Aa, Solomin, An, Voronin, Ag, Zotov, Np, Bentvelsen, S, Botje, M, Chlebana, F, Dake, A, Engelen, J, Dejong, P, Dekamps, M, Kooijman, P, Kruse, A, Odell, V, Tenner, A, Tiecke, H, Verkerke, W, Vreeswijk, M, Wiggers, L, Dewolf, E, Vanwoudenberg, R, Acosta, D, Bylsma, B, Durkin, L, Honscheid, K, Li, C, Ling, Ty, Mclean, Kw, Murray, Wn, Park, Ih, Romanowski, Ta, Seidlein, R, Bailey, D, Blair, Ga, Byrne, A, Cashmore, Rj, Coopersarkar, Am, Daniels, D, Devenish, Rce, Harnew, N, Lancaster, M, Luffman, Pe, Mcfall, J, Nath, C, Quadt, A, Uijterwaal, H, Walczak, R, Wilson, Ff, Yip, T, Abbiendi, G, Bertolin, A, Brugnera, R, Carlin, R, Dalcorso, F, Degiorgi, M, Dosselli, U, Gasparini, F, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Bulmahn, J, Butterworth, Jm, Field, Rg, Oh, By, Whitmore, Jj, Dagostini, G, Guida, M, Iori, M, Mari, Stefano Maria, Marini, G, Mattioli, M, Nigro, A, Hart, Jc, Mccubbin, Na, Prytz, K, Shah, Tp, Short, Tl, Barberis, E, Cartiglia, N, Heusch, C, Vanhook, M, Hubbard, B, Lockman, W, Sadrozinski, Hfw, Seiden, A, Zerzion, D, Biltzinger, J, Seifert, Rj, Walenta, Ah, Zech, G, Abramowicz, H, Dagan, S, Levy, A, Hasegawa, T, Hazumi, M, Ishii, T, Kuze, M, Mine, S, Nagasawa, Y, Nagira, T, Nakao, M, Suzuki, I, Tokushuku, K, Yamada, S, Yamazaki, Y, Chiba, M, Hamatsu, R, Hirose, T, Homma, K, Kitamura, S, Nagayama, S, Nakamitsu, Y, Cirio, R, Costa, M, Ferrero, Mi, Lamberti, L, Maselli, S, Peroni, C, Sacchi, R, Solano, A, Staiano, A, Dardo, M, Bailey, Dc, Bandyopadhyay, D, Benard, F, Bhadra, S, Brkic, M, Crombie, Mb, Gingrich, Dm, Hartner, Gf, Levman, Gm, Martin, Jf, Orr, R, Sampson, Cr, Teuscher, Rj, Bullock, Fw, Catterall, Cd, Giddings, Jc, Jones, Tw, Khan, Am, Lane, Jb, Makkar, Pl, Shaw, D, Shulman, J, Blankenship, K, Kochocki, J, Lu, B, Mo, Lw, Bogusz, W, Charchula, K, Ciborowski, J, Gajewski, J, Grzelak, G, Kasprzak, M, Krzyzanowski, M, Muchorowski, K, Nowak, Rj, Pawlak, Jm, Tymieniecka, T, Wroblewski, Ak, Zakrzewski, Ja, Zarnecki, Af, Adamus, M, Eisenberg, Y, Glasman, C, Karshon, U, Revel, D, Shapira, A, Ali, I, Behrens, B, Dasu, S, Fordham, C, Foudas, C, Goussiou, A, Loveless, Rj, Reeder, Dd, Silverstein, S, Smith, Wh, Frisken, Wr, Furutani, Km, and Iga, Y.
Subjects: LUND MONTE-CARLO, DIFFRACTION DISSOCIATION, POMERON STRUCTURE, E+E-PHYSICS, ZEUS, VERSION, FRAGMENTATION, CALORIMETER, DETECTOR, EVENTS, Nuclear and High Energy Physics, Particle physics, jet production, Astrophysics::High Energy Astrophysical Phenomena, deep inelastic scattering, large rapidity gap, Virtual particle, Electron, Nuclear physics, Energy flow, Rapidity, Nuclear Experiment, Physics, Scattering, HERA, Deep inelastic scattering, Transverse plane, High Energy Physics::Experiment
Abstract: Events with a large rapidity gap in deep inelastic scattering with Q2 greater-than-or-equal-to 10 GeV2 have been studied in the ZEUS detector. The properties of these events with W > 140 GeV are consistent with a leading twist diffractive production mechanism. In the laboratory frame, with E(T)jet greater-than-or-equal-to 4 GeV, 15% of the events are of the 1-jet type with negligible 2-jet production. The single jet is back-to-back in azimuth with the scattered electron. No energy flow is observed between the jet and the proton direction. With a lower jet transverse energy cut 2-jet production is observed both in the laboratory and the gamma*p centre-of-mass systems, demonstrating the presence of hard scattering in the virtual photon proton interactions that give rise to large rapidity gap events.
Published: 1994
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4. Measurement of inclusive prompt photon photoproduction at HERA

Author: Breitweg, J, Chekanov, S, Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Pellegrino, A, Repond, J, Stanek, R, Yoshida, R, Mattingly, M C K, Abbiendi, G, Anselmo, F, Antonioli, P, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Romeo, G C, Castellini, G, Cifarelli, L, Cindolo, F, Contin, A, Coppola, N, Corradi, M, De Pasquale, S, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Margotti, A, Massam, T, Nania, R, Palmonari, F, Pesci, A, Polini, A, Sartorelli, G, Garcia, Y Z, Zichichi, A, Amelung, C, Bornheim, A, Brock, I, Coboken, K, Crittenden, J, Deffner, R, Hartmann, H, Heinloth, K, Hilger, E, Jakob, H P, Kappes, A, Katz, U F, Kerger, R, Paul, E, Rautenberg, J, Schnurbusch, H, Stifutkin, A, Tandler, J, Voss, K C, Weber, A, Wieber, H, Bailey, D S, Barret, O, Brook, N H, Foster, B, Heath, G P, Heath, H F, McFall, J D, Piccioni, D, Rodrigues, E, Scott, J, Tapper, R J, Capua, M, Mastroberardino, A, Schioppa, M, Susinno, G, Jeoung, H Y, Kim, J Y, Lee, J H, Lim, I T, Ma, K J, Pac, M Y, Caldwell, A, Liu, W, Liu, X, Mellado, B, Sacchi, R, Sampson, S, Sciulli, F, Chwastowski, J, Eskreys, A, Figiel, J, Klimek, K, Olkiewicz, K, Przybycien, M B, Stopa, P, Zawiejski, L, Adamczyk, L, Bednarek, B, Jelen, K, Kisielewska, D, Kowal, A M, Kowalski, T, Przybycien, M, Rulikowska-Zarebska, E, Suszycki, L, Zajac, J, Kotanski, A, Bauerdick, L A T, Behrens, U, Bienlein, J K, Burgard, C, Desler, K, Drews, G, Fox-Murphy, A, Fricke, U, Goebel, F, Gottlicher, P, Graciani, R, Haas, T, Hain, W, Hartner, G F, Hasell, D, Hebbel, K, Johnson, K F, Kasemann, M, Koch, W, Kotz, U, Kowalski, H, Lindemann, L, Lohr, B, Martinez, M, Milite, M, Monteiro, T, Moritz, M, Notz, D, Pelucchi, F, Petrucci, M C, Piotrzkowski, K, Rohde, M, Saull, P R B, Savin, A A, Schneekloth, U, Selonke, F, Sievers, M, Stonjek, S, Tassi, E, Wolf, G, Wollmer, U, Youngman, C, Zeuner, W, Coldewey, C, Grabosch, H J, Viani, A L D, Meyer, A, Schlenstedt, S, Straub, P B, Barbagli, G, Gallo, E, Pelfer, P, Maccarrone, G, Votano, L, Bamberger, A, Eisenhardt, S, Markun, P, Raach, H, Wolfle, S, Bussey, P J, Doyle, A T, Lee, S W, Macdonald, N, McCance, G J, Saxon, D H, Sinclair, L E, Skillicorn, I O, Waugh, R, Bohnet, I, Gendner, N, Holm, U, Meyer-Larsen, A, Salehi, H, Wick, K, Garfagnini, A, Gialas, I, Gladilin, L K, Kcira, D, Klanner, R, Lohrmann, E, Poelz, G, Zetsche, F, Goncalo, R, Long, K R, Miller, D B, Tapper, A D, Walker, R, Mallik, U, Wang, S M, Cloth, P, Filges, D, Ishii, T, Kuze, M, Nagano, K, Tokushuku, K, Yamada, S, Yamazaki, Y, Ahn, S H, An, S H, Hong, S J, Lee, S B, Nam, S W, Park, S K, Lim, H, Park, I H, Son, D, Barreiro, F, Garcia, G, Glasman, C, Gonzalez, O, Labarga, L, del Peso, J, Redondo, I, Terron, J, Barbi, M, Corriveau, F, Hanna, D S, Ochs, A, Padhi, S, Riveline, M, Stairs, D G, Wing, M, Tsurugai, T, Bashkirov, V, Dolgoshein, B A, Bashindzhagyan, G L, Ermolov, P F, Golubkov, Y A, Khein, L A, Korotkova, N A, Korzhavina, I A, Kuzmin, V A, Lukina, O Y, Proskuryakov, A S, Shcheglova, L M, Solomin, A N, Zotkin, S A, Bokel, C, Botje, M, Brummer, N, Engelen, J, Koffeman, E, Kooijman, P, van Sighem, A, Tiecke, H, Tuning, N, Velthuis, J J, Verkerke, W, Vossebeld, J, Wiggers, L, de Wolf, E, Bylsma, B, Durkin, L S, Gilmore, J, Ginsburg, C M, Kim, C L, Ling, T Y, Nylander, P, Boogert, S, Cooper-Sarkar, A M, Devenish, R C E, Grosse-Knetter, J, Matsushita, T, Ruske, O, Sutton, M R, Walczak, R, Bertolin, A, Brugnera, R, Carlin, R, Dal Corso, F, Dondana, S, Dosselli, U, Dusini, S, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Iannotti, L, Oh, B Y, Okrasinski, J R, Toothacker, W S, Whitmore, J J, Iga, Y, D'Agostini, G, Marini, G, Nigro, A, Cormack, C, Hart, J C, McCubbin, N A, Shah, T P, Epperson, D, Heusch, C, Sadrozinski, H F W, Seiden, A, Wichmann, R, Williams, D C, Pavel, N, Abramowicz, H, Dagan, S, Kananov, S, Kreisel, A, Levy, A, Abe, T, Fusayasu, T, Umemori, K, Yamashita, T, Hamatsu, R, Hirose, T, Inuzuka, M, Kitamura, S, Nishimura, T, Arneodo, M, Cartiglia, N, Cirio, R, Costa, M, Ferrero, M I, Maselli, S, Monaco, V, Peroni, C, Ruspa, M, Solano, A, Staiano, A, Dardo, M, Bailey, D C, Fagerstroem, C P, Galea, R, Koop, T, Levman, G M, Martin, J F, Orr, R S, Polenz, S, Sabetfakhri, A, Simmons, D, Butterworth, J M, Catterall, C D, Hayes, M E, Heaphy, E A, Jones, T W, Lane, J B, West, B J, Ciborowski, J, Ciesielski, R, Grzelak, G, Nowak, R J, Pawlak, J M, Pawlak, R, Smalska, B, Tymieniecka, T, Wroblewski, A K, Zakrzewski, J A, Zarnecki, A F, Adamus, M, Gadaj, T, Deppe, O, Eisenberg, Y, Hochman, D, Karshon, U, Badgett, W F, Chapin, D, Cross, R, Foudas, C, Mattingly, S, Reeder, D D, Smith, W H, Vaiciulis, A, Wildschek, T, Wodarczyk, M, Deshpande, A, Dhawan, S, Hughes, V W, Bhadra, S, Cole, J E, Frisken, W R, Hall-Wilton, R, Khakzad, M, Menary, S, Schmidke, W B, ZEUS Collaboration, and Zeus (IHEF, IoP, FNWI)
Subjects: Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Parton, PROTON, 01 natural sciences, law.invention, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), MONTE-CARLO, DESIGN, law, 0103 physical sciences, ZEUS, CENTRAL TRACKING DETECTOR, JET CROSS-SECTIONS, PARTON DISTRIBUTIONS, HARD SCATTERING, CONSTRUCTION, CALORIMETER, 010306 general physics, Collider, Nuclear Experiment, QC, Quantum chromodynamics, Physics, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), Luminosity (scattering theory), 010308 nuclear & particles physics, Faculty of Science\Physics, HERA, Photon structure function, Pseudorapidity, High Energy Physics::Experiment
Abstract: First inclusive measurements of isolated prompt photons in photoproduction at the HERA ep collider have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb$^{-1}$. Cross sections are given as a function of the pseudorapidity and the transverse energy ($\eta^\gamma$, \eTg) of the photon, for $\eTg > $ 5 GeV in the $\gamma p$ centre-of-mass energy range 134-285 GeV. Comparisons are made with predictions from Monte Carlo models having leading-logarithm parton showers, and with next-to-leading-order QCD calculations, using currently available parameterisations of the photon structure. For forward $\eta^\gamma$ (proton direction) good agreement is found, but in the rear direction all predictions fall below the data., Comment: 21 pages including 4 figures and 2 tables
Published: 2001
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5. Measurement of the proton structure function F-2 at very low Q(2) at HERA

Author: Breitweg, J, Chekanov, S, Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Pellegrino, A, Repond, J, Stanek, R, Yoshida, R, Mattingly, M C K, Abbiendi, G, Anselmo, F, Antonioli, P, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Romeo, G C, Castellini, G, Cifarelli, L, Cindolo, F, Contin, A, Coppola, N, Corradi, M, De Pasquale, S, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Margotti, A, Massam, T, Nania, R, Palmonari, F, Pesci, A, Polini, A, Sartorelli, G, Garcia, Y Z, Zichichi, A, Amelung, C, Bornheim, A, Brock, I, Coboken, K, Crittenden, J, Deffner, R, Hartmann, H, Heinloth, K, Hilger, E, Irrgang, P, Jakob, H P, Kappes, A, Katz, U F, Kerger, R, Paul, E, Schnurbusch, H, Stifutkin, A, Tandler, J, Voss, K C, Weber, A, Wieber, H, Bailey, D S, Barret, O, Brook, N H, Foster, B, Heath, G P, Heath, H F, McFall, J D, Piccioni, D, Rodrigues, E, Scott, J, Tapper, R J, Capua, M, Mastroberardino, A, Schioppa, M, Susinno, G, Jeoung, H Y, Kim, J Y, Lee, J H, Lim, I T, Ma, K J, Pac, M Y, Caldwell, A, Liu, W, Liu, X, Mellado, B, Paganis, S, Sampson, S, Schmidke, W B, Sciulli, F, Chwastowski, J, Eskreys, A, Figiel, J, Klimek, K, Olkiewicz, K, Piotrzkowski, K, Przybycien, M B, Stopa, P, Zawiejski, L, Bednarek, B, Jelen, K, Kisielewska, D, Kowal, A M, Kowalski, T, Przybycien, M, Rulikowska-Zarebska, E, Suszycki, L, Szuba, D, Kotanski, A, Bauerdick, L A T, Behrens, U, Bienlein, J K, Burgard, C, Dannheim, D, Desler, K, Drews, G, Fox-Murphy, A, Fricke, U, Goebel, F, Gottlicher, P, Graciani, R, Haas, T, Hain, W, Hartner, G F, Hasell, D, Hebbel, K, Johnson, K F, Kasemann, M, Koch, W, Kotz, U, Kowalski, H, Lindemann, L, Lohr, B, Martinez, M, Milite, M, Monteiro, T, Moritz, M, Notz, D, Pelucchi, F, Petrucci, M C, Rohde, M, Saull, P R B, Savin, A A, Schneekloth, U, Selonke, F, Sievers, M, Stonjek, S, Tassi, E, Wolf, G, Wollmer, U, Youngman, C, Zeuner, W, Coldewey, C, Viani, A L D, Meyer, A, Schlenstedt, S, Straub, P B, Barbagli, G, Gallo, E, Pelfer, P, Maccarrone, G, Votano, L, Bamberger, A, Benen, A, Eisenhardt, S, Markun, P, Raach, H, Wolfle, S, Bussey, P J, Bell, M, Doyle, A T, Lee, S W, Lupi, A, Macdonald, N, McCance, G J, Saxon, D H, Sinclair, L E, Skillicorn, I O, Waugh, R, Bohnet, I, Gendner, N, Holm, U, Meyer-Larsen, A, Salehi, H, Wick, K, Garfagnini, A, Gialas, I, Gladilin, L K, Kcira, D, Klanner, R, Lohrmann, E, Poelz, G, Zetsche, F, Goncalo, R, Long, K R, Miller, D B, Tapper, A D, Walker, R, Mallik, U, Cloth, P, Filges, D, Ishii, T, Kuze, M, Nagano, K, Tokushuku, K, Yamada, S, Yamazaki, Y, Ahn, S H, Lee, S B, Park, S K, Lim, H, Park, I H, Son, D, Barreiro, F, Garcia, G, Glasman, C, Gonzalez, O, Labarga, L, del Peso, J, Redondo, I, Terron, J, Barbi, M, Corriveau, F, Hanna, D S, Ochs, A, Padhi, S, Riveline, M, Stairs, D G, Wing, M, Tsurugai, T, Antonov, A, Bashkirov, V, Danilov, M, Dolgoshein, B A, Gladkov, D, Sosnovtsev, V, Suchkov, S, Dementiev, R K, Ermolov, P F, Golubkov, Y A, Katkov, I I, Khein, L A, Korotkova, N A, Korzhavina, I A, Kuzmin, V A, Lukina, O Y, Proskuryakov, A S, Shcheglova, L M, Solomin, A N, Vlasov, N N, Zotkin, S A, Bokel, C, Botje, M, Brummer, N, Engelen, J, Grijpink, S, Koffeman, E, Kooijman, P, Schagen, S, van Sighem, A, Tiecke, H, Tuning, N, Velthuis, J J, Vossebeld, J, Wiggers, L, de Wolf, E, Acosta, D, Bylsma, B, Durkin, L S, Gilmore, J, Ginsburg, C M, Kim, C L, Ling, T Y, Boogert, S, Cooper-Sarkar, A M, Devenish, R C E, Grosse-Knetter, J, Matsushita, T, Quadt, A, Ruske, O, Sutton, M R, Walczak, R, Bertolin, A, Brugnera, R, Carlin, R, Dal Corso, F, Dosselli, U, Dusini, S, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Turcato, M, Voci, C, Adamczyk, L, Iannotti, L, Oh, B Y, Okrasinski, J R, Toothacker, W S, Whitmore, J J, Iga, Y, D'Agostini, G, Marini, G, Nigro, A, Cormack, C, Hart, J C, McCubbin, N A, Shah, T P, Epperson, D, Heusch, C, Sadrozinski, H F W, Seiden, A, Wichmann, R, Williams, D C, Pavel, N, Abramowicz, H, Dagan, S, Kananov, S, Kreisel, A, Levy, A, Abe, T, Fusayasu, T, Umemori, K, Yamashita, T, Hamatsu, R, Hirose, T, Inuzuka, M, Kitamura, S, Nishimura, T, Arneodo, M, Cartiglia, N, Cirio, R, Costa, M, Ferrero, M I, Maselli, S, Monaco, V, Peroni, C, Ruspa, M, Sacchi, R, Solano, A, Staiano, A, Dardo, M, Bailey, D C, Fagerstroem, C P, Galea, R, Koop, T, Levman, G M, Martin, J F, Orr, R S, Polenz, S, Sabetfakhri, A, Simmons, D, Butterworth, J M, Catterall, C D, Hayes, M E, Heaphy, E A, Jones, T W, Lane, J B, West, B J, Ciborowski, J, Ciesielski, R, Grzelak, G, Nowak, R J, Pawlak, J M, Pawlak, R, Smalska, B, Tymieniecka, T, Wroblewski, A K, Zakrzewski, J A, Zarnecki, A F, Adamus, M, Gadaj, T, Deppe, O, Eisenberg, Y, Hochman, D, Karshon, U, Badgett, W F, Chapin, D, Cross, R, Foudas, C, Mattingly, S, Reeder, D D, Smith, W H, Vaiciulis, A, Wildschek, T, Wodarczyk, M, Deshpande, A, Dhawan, S, Hughes, V W, Bhadra, S, Catterall, C, Cole, J E, Frisken, W R, Hall-Wilton, R, Khakzad, M, Menary, S, ZEUS Collaboration, and Zeus (IHEF, IoP, FNWI)
Subjects: Nuclear and High Energy Physics, Proton, LUND MONTE-CARLO, Hadron, FOS: Physical sciences, 01 natural sciences, JET FRAGMENTATION, High Energy Physics - Experiment, Nuclear physics, DEEP-INELASTIC SCATTERING, ENERGY, High Energy Physics - Experiment (hep-ex), Positron, LOW-X, 0103 physical sciences, 010306 general physics, QC, Physics, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), E+E-PHYSICS, 010308 nuclear & particles physics, Scattering, Faculty of Science\Physics, ZEUS, HERA, Deep inelastic scattering, GENERATOR, MODEL, QCD, EP, Regge theory, High Energy Physics::Experiment
Abstract: A measurement of the proton structure function F_2(x,Q^2) is presented in the kinematic range 0.045 GeV^2 < Q^2 < 0.65 GeV^2 and 6*10^{-7} < x < 1*10^{-3}. The results were obtained using a data sample corresponding to an integrated luminosity of 3.9pb^-1 in e^+p reactions recorded with the ZEUS detector at HERA. Information from a silicon-strip tracking detector, installed in front of the small electromagnetic calorimeter used to measure the energy of the final-state positron at small scattering angles, together with an enhanced simulation of the hadronic final state, has permitted the extension of the kinematic range beyond that of previous measurements. The uncertainties in F_2 are typically less than 4%. At the low Q^2 values of the present measurement, the rise of F_2 at low x is slower than observed in HERA data at higher Q^2 and can be described by Regge theory with a constant logarithmic slope. The dependence of F_2 on Q^2 is stronger than at higher Q^2 values, approaching, at the lowest Q^2 values of this measurement, a region where F_2 becomes nearly proportional to Q^2., 23 pages including 4 figures. Revised version (v2) has a corrected author list and implements comments from the referee. Accepted by Phys. Lett. B
Published: 2000

6. The Q(2) dependence of dijet cross sections in gamma p interactions at HERA

Author: Breitweg, J, Chekanov, S, Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Pellegrino, A, Repond, J, Stanek, R, Yoshida, R, Mattingly, M C K, Abbiendi, G, Anselmo, F, Antonioli, P, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Romeo, G C, Castellini, G, Cifarelli, L, Cindolo, F, Contin, A, Coppola, N, Corradi, M, De Pasquale, S, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Margotti, A, Massam, T, Nania, R, Palmonari, F, Pesci, A, Polini, A, Sartorelli, G, Garcia, Y Z, Zichichi, A, Amelung, C, Bornheim, A, Brock, I, Coboken, K, Crittenden, J, Deffner, R, Hartmann, H, Heinloth, K, Hilger, E, Irrgang, P, Jakob, H P, Kappes, A, Katz, U F, Kerger, R, Paul, E, Schnurbusch, H, Stifutkin, A, Tandler, J, Voss, K C, Weber, A, Wieber, H, Bailey, D S, Barret, O, Brook, N H, Foster, B, Heath, G P, Heath, H F, McFall, J D, Piccioni, D, Rodrigues, E, Scott, J, Tapper, R J, Capua, M, Mastroberardino, A, Schioppa, M, Susinno, G, Jeoung, H Y, Kim, J Y, Lee, J H, Lim, I T, Ma, K J, Pac, M Y, Caldwell, A, Liu, W, Liu, X, Mellado, B, Paganis, S, Sacchi, R, Sampson, S, Sciulli, F, Chwastowski, J, Eskreys, A, Figiel, J, Klimek, K, Olkiewicz, K, Piotrzkowski, K, Przybycien, M B, Stopa, P, Zawiejski, L, Adamczyk, L, Bednarek, B, Jelen, K, Kisielewska, D, Kowal, A M, Kowalski, T, Przybycien, M, Rulikowska-Zarebska, E, Suszycki, L, Szuba, D, Kotanski, A, Bauerdick, L A T, Behrens, U, Bienlein, J K, Burgard, C, Desler, K, Drews, G, Fox-Murphy, A, Fricke, U, Goebel, F, Gottlicher, P, Graciani, R, Haas, T, Hain, W, Hartner, G F, Hasell, D, Hebbel, K, Johnson, K F, Kasemann, M, Koch, W, Kotz, U, Kowalski, H, Lindemann, L, Lohr, B, Martinez, M, Milite, M, Monteiro, T, Moritz, M, Notz, D, Pelucchi, F, Petrucci, M C, Rohde, M, Saull, P R B, Savin, A A, Schneekloth, U, Selonke, F, Sievers, M, Stonjek, S, Tassi, E, Wolf, G, Wollmer, U, Youngman, C, Zeuner, W, Coldewey, C, Grabosch, H J, Viani, A L D, Meyer, A, Schlenstedt, S, Straub, P B, Barbagli, G, Gallo, E, Pelfer, P, Maccarrone, G, Votano, L, Bamberger, A, Benen, A, Eisenhardt, S, Markun, P, Raach, P, Wolfle, S, Bussey, P J, Doyle, A T, Lee, S W, Macdonald, N, McCance, G J, Saxon, D H, Sinclair, L E, Skillicorn, I O, Waugh, R, Bohnet, I, Gendner, N, Holm, U, Meyer-Larsen, A, Salehi, H, Wick, K, Dannheim, D, Garfagnini, A, Gialas, I, Gladilin, L K, Kcira, D, Klanner, R, Lohrmann, E, Poelz, G, Zetsche, F, Goncalo, R, Long, K R, Miller, D B, Tapper, A D, Walker, R, Mallik, U, Cloth, P, Filges, D, Ishii, T, Kuze, M, Nagano, K, Tokushuku, K, Yamada, S, Yamazaki, Y, Ahn, S H, An, S H, Hong, S J, Lee, S B, Nam, S W, Park, S K, Lim, H, Park, I H, Son, D, Barreiro, F, Garcia, G, Glasman, C, Gonzalez, O, Labarga, L, del Peso, J, Redondo, I, Terron, J, Barbi, M, Corriveau, F, Hanna, D S, Ochs, A, Padhi, S, Riveline, M, Stairs, D G, Wing, M, Tsurugai, T, Bashkirov, V, Dolgoshein, B A, Dementiev, R K, Ermolov, P F, Golubkov, Y A, Katkov, I I, Khein, L A, Korotkova, N A, Korzhavina, I A, Kuzmin, V A, Lukina, O Y, Proskuryakov, A S, Shcheglova, L M, Solomin, A N, Vlasov, N N, Zotkin, S A, Bokel, C, Botje, M, Brummer, N, Engelen, J, Grijpink, S, Koffeman, E, Kooijman, P, Schagen, S, van Sighem, A, Tiecke, H, Tuning, N, Velthuis, J J, Vossebeld, J, Wiggers, L, de Wolf, E, Bylsma, B, Durkin, L S, Gilmore, J, Ginsburg, C M, Kim, C L, Ling, T Y, Nylander, P, Boogert, S, Cooper-Sarkar, A M, Devenish, R C E, Grosse-Knetter, J, Matsushita, T, Ruske, O, Sutton, M R, Walczak, R, Bertolin, A, Brugnera, R, Carlin, R, Dal Corso, F, Dosselli, U, Dusini, S, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Iannotti, L, Oh, B Y, Okrasinski, J R, Toothacker, W S, Whitmore, J J, Iga, Y, D'Agostini, G, Marini, G, Nigro, A, Cormack, C, Hart, J C, McCubbin, N A, Shah, T P, Epperson, D, Heusch, C, Sadrozinski, H F W, Seiden, A, Wichmann, R, Williams, D C, Pavel, N, Abramowicz, H, Dagan, S, Kananov, S, Kreisel, A, Levy, A, Abe, T, Fusayasu, T, Umemori, K, Yamashita, T, Hamatsu, R, Hirose, T, Inuzuka, M, Kitamura, S, Nishimura, T, Arneodo, M, Cartiglia, N, Cirio, R, Costa, M, Ferrero, M I, Maselli, S, Monaco, V, Peroni, C, Ruspa, M, Solano, A, Staiano, A, Dardo, M, Bailey, D C, Fagerstroem, C P, Galea, R, Koop, T, Levman, G M, Martin, J F, Orr, R S, Polenz, S, Sabetfakhri, A, Simmons, D, Butterworth, J M, Catterall, C D, Hayes, M E, Heaphy, E A, Jones, T W, Lane, J B, West, B J, Ciborowski, J, Ciesielski, R, Grzelak, G, Nowak, R J, Pawlak, J M, Pawlak, R, Smalska, B, Tymieniecka, T, Wroblewski, A K, Zakrzewski, J A, Zarnecki, A F, Adamus, M, Gadaj, T, Deppe, O, Eisenberg, Y, Hochman, D, Karshon, U, Badgett, W F, Chapin, D, Cross, R, Foudas, C, Mattingly, S, Reeder, D D, Smith, W H, Vaiciulis, A, Wildschek, T, Wodarczyk, M, Deshpande, A, Dhawan, S, Hughes, V W, Bhadra, S, Cole, J E, Frisken, W R, Hall-Wilton, R, Khakzad, M, Menary, S, Schmidke, W B, ZEUS Collaborat, and Zeus (IHEF, IoP, FNWI)
Subjects: Nuclear and High Energy Physics, Particle physics, Photon, LEADING ORDER QCD, Virtual particle, FOS: Physical sciences, ZEUS, PHOTON STRUCTURE-FUNCTION, STRUCTURE-FUNCTION F-2(GAMMA), VIRTUAL PHOTON, JET PRODUCTION, PARTON DISTRIBUTIONS, HADRON-COLLISIONS, HARD SCATTERING, PHOTOPRODUCTION, GEV2, Parton, Elementary particle, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Nuclear Experiment, QC, Physics, Research Groups and Centres\Physics\Low Temperature Physics, 010308 nuclear & particles physics, Faculty of Science\Physics, Perturbative QCD, HERA, Photon structure function, Massless particle, High Energy Physics::Experiment
Abstract: The dependence of the photon structure on the photon virtuality, Q^2, is studied by measuring the reaction e^+p\to e^+ + {\rm jet} + {\rm jet} + {\rm X} at photon-proton centre-of-mass energies 134 < W < 223 GeV. Events have been selected in the Q^2 ranges \approx 0 GeV^2, 0.1-0.55 GeV^2, and 1.5-4.5 GeV^2, having two jets with transverse energy E_T^{jet} > 5.5 GeV in the final state. The dijet cross section has been measured as a function of the fractional momentum of the photon participating in the hard process, x_gamma. The ratio of the dijet cross section with x_gamma < 0.75 to that with x_gamma > 0.75 decreases as Q^2 increases. The data are compared with the predictions of NLO pQCD and leading-order Monte Carlo programs using various parton distribution functions of the photon. The measurements can be interpreted in terms of a resolved photon component that falls with Q^2 but remains present at values of Q^2 up to 4.5 GeV^2. However, none of the models considered gives a good description of the data., 15 pages and 4 figures
Published: 2000

7. Measurement of the E(T,jet)^2/Q^2 dependence of forward-jet production at HERA

Author: Breitweg, J, Chekanov, S, Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Pellegrino, A, Repond, J, Stanek, R, Yoshida, R, Mattingly, M C K, Abbiendi, G, Anselmo, F, Antonioli, P, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Romeo, C G, Castellini, G, Cifarelli, L, Cindolo, F, Contin, A, Coppola, N, Corradi, M, De Pasquale, S, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Margotti, A, Massam, T, Nania, R, Palmonari, F, Pesci, A, Polini, A, Sartorelli, G, Garcia, Y Z, Zichichi, A, Amelung, C, Bornheim, A, Brock, I, Coboken, K, Crittenden, J, Deffner, R, Hartmann, H, Heinloth, K, Hilger, E, Jakob, H P, Kappes, A, Katz, U F, Kerger, R, Paul, E, Rautenberg, J, Schnurbusch, H, Stifutkin, A, Tandler, J, Voss, K C, Weber, A, Wieber, H, Bailey, D S, Barret, O, Brook, N H, Foster, B, Heath, G P, Heath, H F, McFall, J D, Piccioni, D, Rodrigues, E, Scott, J, Tapper, R J, Capua, M, Mastroberardino, A, Schioppa, M, Susinno, G, Jeoung, H Y, Kim, J Y, Lee, J H, Lim, I T, Ma, K J, Pac, M Y, Caldwell, A, Liu, W, Liu, X, Mellado, B, Sacchi, R, Sampson, S, Sciulli, F, Chwastowski, J, Eskreys, A, Figiel, J, Klimek, K, Olkiewicz, K, Przybycien, M B, Stopa, P, Zawiejski, L, Adamczyk, L, Bednarek, B, Jelen, K, Kisielewska, D, Kowal, A M, Kowalski, T, Przybycien, M, Rulikowska-Zarebska, E, Suszycki, L, Zajac, J, Kotanski, A, Bauerdick, L A T, Behrens, U, Bienlein, J K, Burgard, C, Desler, K, Drews, G, Fox-Murphy, A, Fricke, U, Goebel, F, Gottlicher, P, Graciani, R, Haas, T, Hain, W, Hartner, G F, Hasell, D, Hebbel, K, Johnson, K F, Kasemann, M, Koch, W, Kotz, U, Kowalski, H, Lindemann, L, Lohr, B, Martinez, M, Milite, M, Monteiro, T, Moritz, M, Notz, D, Pelucchi, F, Petrucci, M C, Piotrzkowski, K, Rohde, M, Saull, P R B, Savin, A A, Schneekloth, U, Selonke, F, Sievers, M, Stonjek, S, Tassi, E, Wolf, G, Wollmer, U, Youngman, C, Zeuner, W, Coldewey, C, Grabosch, H J, Viani, A L D, Meyer, A, Schlenstedt, S, Straub, P B, Barbagli, G, Gallo, E, Pelfer, P, Maccarone, G, Votano, L, Bamberger, A, Eisenhardt, S, Markun, P, Raach, H, Wolfle, S, Bussey, P J, Doyle, A T, Lee, S W, Macdonald, N, McCance, G J, Saxon, D H, Sinclair, L E, Skillicorn, I O, Waugh, R, Bohnet, I, Gendner, N, Holm, U, Meyer-Larsen, A, Salehi, H, Wick, K, Garfagnini, A, Gialas, I, Gladilin, L K, Kcira, D, Klanner, R, Lohrmann, E, Poelz, G, Zetsche, F, Goncalo, R, Long, K R, Miller, D B, Tapper, A D, Walker, R, Mallik, U, Wang, S M, Cloth, P, Filges, D, Ishii, T, Kuze, M, Nagano, K, Tokushuku, K, Yamada, S, Yamazaki, Y, Ahn, S H, An, S H, Hong, S J, Lee, S B, Nam, S W, Park, S K, Lim, H, Park, I H, Son, D, Barreiro, F, Garcia, G, Glasman, C, Gonzalez, O, Labarga, L, del Peso, J, Redondo, I, Terron, J, Barbi, M, Corriveau, F, Hanna, D S, Hartmann, J, Ochs, A, Padhi, S, Riveline, M, Stairs, D G, Wing, M, Tsurugai, T, Bashkirov, V, Dolgoshein, B A, Bashindzhagyan, G L, Ermolov, P F, Golubkov, Y A, Khein, L A, Korotkova, N A, Korzhavina, I A, Kuzmin, V A, Lukina, O Y, Proskuryakov, A S, Shcheglova, L M, Solomin, A N, Zotkin, S A, Bokel, C, Botje, M, Brummer, N, Engelen, J, Koffeman, E, Kooijman, P, van Sighem, A, Tiecke, H, Tuning, N, Velthuis, J J, Verkerke, W, Vossebeld, J, Wiggers, L, de Wolf, E, Bylsma, B, Durkin, L S, Gilmore, J, Ginsburg, C M, Kim, C L, Ling, T Y, Nylander, P, Boogert, S, Cooper-Sarkar, A M, Devenish, R C E, Grosse-Knetter, J, Matsushita, T, Ruske, O, Sutton, M R, Walczak, R, Bertolin, A, Brugnera, R, Carlin, R, Dal Corso, F, Dondana, S, Dosselli, U, Dusini, S, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Iannotti, L, Oh, B Y, Okrasinski, J R, Toothacker, W S, Whitmore, J J, Iga, Y, D'Agostini, G, Marini, G, Nigro, A, Cormack, C, Hart, J C, McCubbin, N A, Shah, T P, Epperson, D, Heusch, C, Sadrozinski, H F W, Seiden, A, Wichmann, R, Williams, D C, Pavel, N, Abramowicz, H, Dagan, S, Kananov, S, KReisel, A, Levy, A, Abe, T, Fusayasu, T, Umemori, K, Yamashita, T, Hamatsu, R, Hirose, T, Inuzuka, M, Kiatmura, S, Nishimura, T, Arneodo, M, Cartiglia, N, Cirio, R, Costa, M, Ferrero, M I, Maselli, S, Monaco, V, Peroni, C, Ruspa, M, Solano, A, Staiano, A, Dardo, M, Bailey, D C, Fagerstroem, C P, Galea, R, Koop, T, Levman, G M, Martin, J F, Orr, R S, Polenz, S, Sabetfakhri, A, Simmons, D, Butterworth, J M, Catterall, C D, Hayes, M E, Heaphy, E A, Jones, T W, Lane, J B, Weest, B J, Ciborowski, J, Ciesielski, R, Grzelak, G, Nowak, R J, Pawlak, J M, Pawlak, R, Smalska, B, Tymieniecka, T, Wroblewski, A K, Zakrzewski, J A, Zarnecki, A F, Adamus, M, Gadaj, T, Deppe, O, Eisenberg, Y, Hochman, D, Karshon, U, Badgett, W F, Chapin, D, Cross, R, Foudas, C, Mattingly, S, Reeder, D D, Smith, W H, Vaiciulis, A, Wildschek, T, Wodarczyk, M, Deshpande, A, Dhawan, S, Hughes, V W, Bhadra, S, Cole, J E, Frisken, W R, Hall-Wilton, R, Khakzad, M, Menary, S, Schmidke, W B, ZEUS Collaboration, and Zeus (IHEF, IoP, FNWI)
Subjects: Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 01 natural sciences, CASCADES, High Energy Physics - Experiment, Nuclear physics, Cross section (physics), High Energy Physics - Experiment (hep-ex), QCD COHERENCE, 0103 physical sciences, DISTRIBUTIONS, SCATTERING, 010303 astronomy & astrophysics, SMALL-X, QC, Quantum chromodynamics, Physics, Jet (fluid), Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), Luminosity (scattering theory), 010308 nuclear & particles physics, Scattering, Faculty of Science\Physics, ZEUS, INITIAL STATE RADIATION, GENERATOR, HERA, Transverse plane, High Energy Physics::Experiment
Abstract: The forward-jet cross section in deep inelastic ep scattering has been measured using the ZEUS detector at HERA with an integrated luminosity of 6.36 pb^-1. The jet cross section is presented as a function of jet transverse energy squared, E(T,jet)^2, and Q^2 in the kinematic ranges 10^-2, Comment: 8 pages including 3 figures
Published: 1999
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8. Search for selectron and squark production in e(+)p collisions at HERA

Author: Breitweg, J., Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Yoshida, R., Zhang, H., Mattingly, M. C. K., Anselmo, F., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Cara Romeo, G., Castellini, G., Cifarelli, L., Cindolo, F., Contin, A., Coppola, N., Corradi, M., Pasquale, S., Giusti, P., Iacobucci, G., Laurenti, G., Giuseppe Levi, Margotti, A., Massam, T., Nania, R., Palmonari, F., Pesci, A., Polini, A., Sartorelli, G., Zamora Garcia, Y., Zichichi, A., Amelung, C., Bornheim, A., Brock, I., Coböken, K., Crittenden, J., Deffner, R., Eckert, M., Grothe, M., Hartmann, H., Heinloth, K., Heinz, L., Hilger, E., Jakob, H. -P, Kappes, A., Katz, U. F., Kerger, R., Paul, E., Pfeiffer, M., Stamm, J., Wieber, H., Bailey, D. S., Campbell-Robson, S., Cottingham, W. N., Foster, B., Hall-Wilton, R., Heath, G. P., Heath, H. F., Mcfall, J. D., Piccioni, D., Roff, D. G., Tapper, R. J., Capua, M., Iannotti, L., Schioppa, M., Susinno, G., Kim, J. Y., Lee, J. H., Lim, I. T., Pac, M. Y., Caldwell, A., Cartiglia, N., Jing, Z., Liu, W., Mellado, B., Parsons, J. A., Ritz, S., Sampson, S., Sciulli, F., Straub, P. B., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Figiel, J., Klimek, K., Przybycień, M. B., Zawiejski, L., Adamczyk, L., Bednarek, B., Bukowy, M., Czermak, A. M., Jeleń, K., Kisielewska, D., Kowalski, T., Przybycień, M., Rulikowska-Zarebska, E., Suszycki, L., Zajac, J., Duliński, Z., Kotański, A., Abbiendi, G., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Desler, K., Drews, G., Fricke, U., Gialas, I., Goebel, F., Göttlicher, P., Graciani, R., Haas, T., Hain, W., Hartner, G. F., Hasell, D., Hebbel, K., Johnson, K. F., Kasemann, M., Koch, W., Kötz, U., Kowalski, H., Lindemann, L., Löhr, B., Martínez, M., Miiewski, J., Milite, M., Monteiro, T., Notz, D., Pellegrino, A., Pelucchi, F., Piotrzkowski, K., Rohde, M., Roldán, J., Ryan, J. J., Saull, P. R. B., Savin, A. A., Schneekloth, U., Schwarzer, O., Selonke, F., Stonjek, S., Surrow, B., Tassi, E., Westphal, D., Wolf, G., Wollmer, U., Youngman, C., Zeuner, W., Burow, B. D., Coldewey, C., Grabosch, H. J., Meyer, A., Schlenstedt, S., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, G., Votano, L., Bamberger, A., Eisenhardt, S., Markun, P., Raach, H., Trefzger, T., Wölfle, S., Bromley, J. T., Brook, N. H., Bussey, P. J., Doyle, A. T., Lee, S. W., Macdonald, N., Mccance, G. J., Saxon, D. H., Sinclair, L. E., Skillicorn, I. O., Strickland, E., Waugh, R., Bohnet, I., Gendner, N., Holm, U., Meyer-Larsen, A., Salehi, H., Wick, K., Garfagnini, A., Gladilin, L. K., Kçira, D., Klanner, R., Lohrmann, E., Poelz, G., Zetsche, F., Bacon, T. C., Butterworth, I., Cole, J. E., Howell, G., Lamberti, L., Long, K. R., Miller, D. B., Pavel, N., Prinias, A., Sedgbeer, J. K., Sideris, D., Walker, R., Mallik, U., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., Fleck, J. I., Ishii, T., Kuze, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamauchi, K., Yamazaki, Y., Hong, S. J., Lee, S. B., Nam, S. W., Park, S. K., Lim, H., Park, I. H., Son, D., Barreiro, F., Fernández, J. P., García, G., Glassnan, C., Hernández, J. M., Hervás, L., Labarga, L., Del Peso, J., Puga, J., Terron, J., Trocóniz, J. F., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Murray, W. N., Ochs, A., Riveline, M., Stairs, D. G., St-Laurent, M., Ullmann, R., Tsurugai, T., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Golubkov, Y. A., Khein, L. A., Korotkova, N. A., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Y., Proskuryakov, A. S., Shcheglova, L. M., Solomin, A. N., Zotkin, S. A., Bokel, C., Botje, M., Brümmer, N., Engelen, J., Koffeman, E., Kooijman, P., Sighem, A., Tiecke, H., Tuning, N., Verkerke, W., Vossebeld, J., Wiggers, L., Wolf, E., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Ginsburg, C. M., Kim, C. L., Ling, T. Y., Nylander, P., Romanowski, T. A., Blaikley, H. E., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Edmonds, J. K., Groóße-Knetter, J., Harnew, N., Nath, C., Noyes, V. A., Quadt, A., Ruske, O., Tickner, J. R., Walczak, R., Waters, D. S., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Oh, B. Y., Okrasiński, J. R., Toothacker, W. S., Whitmore, J. J., Iga, Y., D Agostini, G., Marini, G., Nigro, A., Raso, M., Hart, J. C., Mccubbin, N. A., Shah, T. P., Epperson, D., Heusch, C., Rahn, J. T., Sadrozinski, H. F. -W, Seiden, A., Wichmann, R., Williams, D. C., Abramowicz, H., Briskin, G., Dagan, S., Kananov, S., Levy, A., Abe, T., Fusayasu, T., Inuzuka, M., Nagano, K., Umemori, K., Yamashita, T., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Matsushita, T., Arneodo, M., Cirio, R., Costa, M., Ferrero, M. I., Maselli, S., Monaco, V., Peroni, C., Petrucci, M. C., Ruspa, M., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Fagerstroem, C. -P, Galea, R., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sabetfakhri, A., Simmons, D., Butterworth, J. M., Catterall, C. D., Hayes, M. E., Jones, T. W., Lane, J. B., Saunders, R. L., Sutton, M. R., Wing, M., Ciborowski, J., Grzelak, G., Kasprzak, M., Nowak, R. J., Pawlak, J. M., Pawlak, R., Smalska, B., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Deppe, O., Eisenberg, Y., Hochman, D., Karshon, U., Badgett, W. F., Chapin, D., Cross, R., Dasu, S., Foudas, C., Loveless, R. J., Mattingly, S., Reeder, D. D., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Deshpande, A., Dhawan, S., Hughes, V. W., Bhadra, S., Frisken, W. R., Khakzad, M., and Schmidke, W. B.
Subjects: Nuclear and High Energy Physics, Stop squark, Particle physics, MONTE-CARLO GENERATOR, FOS: Physical sciences, ENERGY EP COLLISIONS, 01 natural sciences, JET FRAGMENTATION, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), E(+)E(-) COLLISIONS, EVENT GENERATOR, 0103 physical sciences, SUPERGRAVITY, 010306 general physics, SUPERSYMMETRY, Physics, E+E-PHYSICS, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, ZEUS, PARTON DISTRIBUTIONS, MODEL, Superpartner, HERA, Supersymmetry, Selectron tube, Neutralino, High Energy Physics::Experiment, Minimal Supersymmetric Standard Model
Abstract: We have searched for the production of a selectron and a squark in $e^+p$ collisions at a center-of-mass energy of 300 GeV using the ZEUS detector at HERA. The selectron and squark are sought in the direct decay into the lightest neutralino in the framework of supersymmetric extensions to the Standard Model which conserve R-parity. No evidence for the production of supersymmetric particles has been found in a data sample corresponding to 46.6~pb$^{-1}$ of integrated luminosity. We express upper limits on the product of the cross section times the decay branching ratios as excluded regions in the parameter space of the Minimal Supersymmetric Standard Model., 22 pages including 4 figures
Published: 1998

9. Measurement of inelastic J/psi photoproduction at HERA

Author: Breitweg, J., Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Yoshida, R., Zhang, H., M. C. K., Anselmo, F., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Romeo, G. C., Castellini, G., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Pasquale, S. D., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Pesci, A., Polini, A., Ricci, F., Sartorelli, G., Garcia, Y. Z., Zichichi, A., Amelung, C., Bornheim, A., Brock, I., Coboken, K., Crittenden, J., Deffner, R., Eckert, M., Grothe, M., Hartmann, H., Heinloth, K., Heinz, L., Hilger, E., Jakob, H. P., Katz, U. F., Kerger, R., Paul, E., Pfeiffer, M., Rembser, C., Stamm, J., Wedemeyer, R., Wieber, H., Bailey, D. S., Campbell Robson, S., Cottingham, W. N., Foster, B., Hall Wilton, R., Hayes, M. E., Heath, G. P., Heath, H. F., Piccioni, D., Roff, D. G., Tapper, R. J., Ameodo, M., Ayad, R., Capua, M., Garfagnini, A., Iannotti, L., Schioppa, M., Susinno, G., Kim, J. Y., Lee, J. H., Lim, I. T., Pac, M. Y., Caldwell, A., Cartiglia, N., Jing, Z., Liu, W., Mellado, B., Parsons, J. A., Ritz, S., Sampson, S., Sciulli, F., Straub, P. B., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Jakubowski, Z., Przybycien, M. B., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Bukowy, M., Jelen, K., Kisielewska, D., Kowalski, T., Przybycien, M., Rulikowska Zarebska, E., Suszycki, L., Zajac, J., Dulinski, Z., Kotanski, A., Abbiendi, G., L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Cases, G., Deppe, O., Desler, K., Drews, G., Fricke, U., Gilkinson, D. J., Glasman, C., Gottlicher, P., Grosse Knetter, J., Haas, T., Hain, W., Hasell, D., Johnson, K. F., Kasemann, M., Koch, W., Kotz, U., Kowalski, H., Labs, J., Lindemann, L., Lohr, B., Lowe, M., Manczak, O., Milewski, J., Monteiro, T., J. S. T., Notz, D., Ohrenberg, K., Park, I. H., Pellegrino, A., Pelucchi, F., Piotrzkowski, K., Roco, M., Rohde, M., Roldan, J., Ryan, J. J., Savin, A. A., Schneekloth, U., Selonke, F., Surrow, B., Tassi, E., Voss, T., Westphal, D., Wolf, G., Wollmer, U., Youngman, C., Zarnecki, A. F., Zeuner, W., Burow, B. D., Grabosch, H. J., Meyer, A., Schlenstedt, S., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, G., Votano, L., Bamberger, A., Eisenhardt, S., Markun, P., Trefzger, T., Wolfle, S., Bromley, J. T., Brook, N. H., Bussey, P. J., Doyle, A. T., Saxon, D. H., Sinclair, L. E., Strickland, E., Utley, M. L., Waugh, R., Wilson, A. S., Bohnet, I., Gendner, N., Holm, U., Meyer Larsen, A., Salehi, H., Wick, K., Gladilin, L. K., Horstmann, D., Kcira, D., Klanner, R., Lohrmann, E., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., T. C. B., Cole, J. E., Harris, V. L., Howell, G., B. H. Y., Lamberti, L., Long, K. R., Miller, D. B., Pavel, N., Prinias, A., Sedgbeer, J. K., Sideris, D., Whitfield, A. F., Mallik, U., Wang, S. M., J. T., Wu, Cloth, P., Filges, D., Fleck, J. I., Ishii, T., Kuze, M., Nakao, M., Tokushuku, K., Yamada, S., Yamazaki, Y., S. H., An, Lee, S. B., Nam, S. W., Park, H. S., Park, S. K., Barreiro, F., Fernandez, J. P., Garcia, G., Graciani, R., Hernandez, J. M., Hervas, L., Labarga, L., Martinez, M., Peso, J. d., Puga, J., Terron, J., J. F., De, Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Murray, W. N., Ochs, A., Riveline, M., Stairs, D. G., St Laurent, M., Ullmann, R., Tsurugai, T., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Golubkov, Y. A., Khein, L. A., Korotkova, N. A., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Y., Proskuryakov, A. S., Shcheglova, L. M., Solomin, A. N., Zotkin, S. A., Bokel, C., Botje, M., Brummer, N., Chlebana, F., Engelen, J., Kooijman, P., Sighem, A. v., Tiecke, H., Tuning, N., Verkerke, W., Vossebeld, J., Vreeswijk, M., Wiggers, L., Wolf, E. d., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Ginsburg, C. M., Kim, C. L., Ling, T. Y., Nylander, P., Romanowski, T. A., Blaikley, H. E., Cashmore, R. J., Cooper Sarkar, A. M., R. C. E., Edmonds, J. K., Harnew, N., Lancaster, M., Mcfall, J. D., Nath, C., Noyes, V. A., Quadt, A., Ruske, O., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Bertolin, A., Brugnera, R., Carlin, R., Corso, F. D., Giorgi, M. D., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Zuin, F., Bulmahn, J., Feild, R. G., B. Y., Oh, Okrasinski, J. R., Whitmore, J. J., Iga, Y., D'Agostini, G., Marini, G., Nigro, A., Raso, M., Hart, J. C., Mccubbin, N. A., Shah, T. P., Epperson, D., Heusch, C., Rahn, J. T., H. F. W., Seiden, A., Williams, D. C., Schwarzer, O., Walenta, A. H., Abramowicz, H., Briskin, G., Dagan, S., Kananov, S., Levy, A., Abe, T., Fusayasu, T., Inuzuka, M., Nagano, K., Suzuki, I., Umemori, K., Yamashita, T., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Matsushita, T., Yamauchi, K., Cirio, Roberto, Costa, Marco, Ferrero, M. I., Maselli, S., Monaco, Vincenzo, Peroni, Cristiana, Petrucci, M. C., Sacchi, Roberto, Solano, Ada Maria, Stiano, A., Dardo, M., Bailey, D. C., Brkic, M., Fagerstroem, C. P., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sampson, C. R., Simmons, D., Teuscher, R. J., Butterworth, J. M., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Sutton, M. R., Lu, B., L. W., Mo, Ciborowski, J., Grzelak, G., Kasprzak, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Pawlak, R., Tymieniecka, T., Wroblewski, A. K., Zakrzewski, J. A., Adamus, M., Coldewey, C., Eisenberg, Y., Hochman, D., Karshon, U., Revel, D., Badgett, W. F., Chapin, D., Cross, R., Dasu, S., Foudas, C., Loveless, R. J., Mattingly, S., Reeder, D. D., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Bhadra, S., Frisken, W. R., Khakzad, M., Schmidke, W. B., and Zeus (IHEF, IoP, FNWI)
Subjects: GLUON DISTRIBUTION, Particle physics, STRUCTURE-FUNCTION F-2(X, Physics and Astronomy (miscellaneous), Proton, LUND MONTE-CARLO, FOS: Physical sciences, PROTON, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, QCD ANALYSIS, Nuclear Experiment, 010306 general physics, Physics, ZEUS (particle detector), CONSTRUCTION, Q(2)), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, ZEUS, ZEUS BARREL CALORIMETER, HERA, J-PSI, CENTRAL TRACKING DETECTOR, PARTON DISTRIBUTIONS, High Energy Physics::Experiment
Abstract: We present a measurement of the inelastic, non diffractive J/$\psi$ photoproduction cross section in the reaction $e^{+} p \to e^{+} {J}/\psi X$ with the ZEUS detector at HERA. The J/$\psi$ was identified using both the $\mu^{+}\mu^{-}$ and $e^{+}e^{-}$ decay channels and events were selected within the range $0.4 1$ GeV$^2$, NLO calculations of the photon-gluon fusion process based on the colour-singlet model are in good agreement with the data. The predictions of a specific leading order colour-octet model, as formulated to describe the CDF data on J/$\psi$ hadroproduction, are not consistent with the data., Comment: 31 pages including 7 figures
Published: 1997

10. Study of photon dissociation in diffractive photoproduction at HERA

Author: Breitweg, J., Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Yoshida, R., Zhang, H., Mattingly, M. C. K., Anselmo, F., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Cara Romeo, G., Castellini, G., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Pasquale, S., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Pesci, A., Polini, A., Sartorelli, G., Zamora Garcia, Y., Zichichi, A., Amelung, C., Bornheim, A., Brock, I., Coböken, K., Crittenden, J., Deffner, R., Ecken, M., Feld, L., Grothe, M., Hartmann, H., Heinloth, K., Heinz, L., Hilger, E., Jakob, H. -P, Katz, U. F., Paul, E., Pfeiffer, M., Rembser, Ch, Stamm, J., Wedemeyer, R., Bailey, D. S., Campbell-Robson, S., Cottingham, W. N., Foster, B., Hall-Wilton, R., Hayes, M. E., Heath, G. P., Heath, H. F., Piccioni, D., Roff, D. G., Tapper, R. J., Arneodo, M., Ayad, R., Capua, M., Garfagnini, A., Iannotti, L., Schioppa, M., Susinno, G., Kim, J. Y., Lee, J. H., Lim, I. T., Pac, M. Y., Caldwell, A., Cartiglia, N., Jing, Z., Liu, W., Parsons, J. A., Ritz, S., Sampson, S., Sciulli, F., Straub, P. B., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Jakubowski, Z., Przybycień, M. B., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jelén, K., Kisielewska, D., Kowalski, T., Przybycień, M., Rulikowska-Zarȩbska, E., Suszycki, L., Zaja̧c, J., Duliński, Z., Kotański, A., Abbiendi, G., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Cases, G., Deppe, O., Desler, K., Drews, G., Fricke, U., Gilkinson, D. J., Glasman, C., Göttlicher, P., Große-Kneller, J., Haas, T., Hain, W., Hasell, D., Heßling, H., Johnson, K. F., Kasemann, M., Koch, W., Kotz, U., Kowalski, H., Labs, J., Lindemann, L., Löhr, B., Löwe, M., Mainusch, J., Mańczak, O., Milewski, J., Monteiro, T., Ng, J. S. T., Notz, D., Ohrenberg, K., Park, I. H., Pellegrino, A., Pelucchi, F., Piotrzkowski, K., Roco, M., Rohde, M., Roldán, J., Ryan, J. J., Savin, A. A., Schneekloth, U., Schulz, W., Selonke, F., Surrow, B., Tassi, E., Voß, T., Weslphal, D., Wolf, G., Wollmer, U., Youngman, C., Zarnecki, A. F., Zeuner, W., Burow, B. D., Grabosch, H. J., Meyer, A., Schlenstedt, S., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, G., Votano, L., Bamberger, A., Eisenhardt, S., Markun, P., Trefzger, T., Wölfle, S., Bromley, J. T., Brook, N. H., Bussey, P. J., Doyle, A. T., Saxon, D. H., Sinclair, L. E., Strickland, E., Utley, M. L., Waugh, R., Wilson, A. S., Bohnet, I., Gendner, N., Holm, U., Meyer-Larsen, A., Salehi, H., Wick, K., Gladilin, L. K., Klanner, R., Lohrmann, E., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Butterworth, I., Cole, J. E., Harris, V. L., Howell, G., Hung, B. H. Y., Lamberti, L., Long, K. R., Miller, D. B., Pavel, N., Prinias, A., Sedgbeer, J. K., Sideris, D., Whitfield, A. F., Mallik, U., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., Fleck, J. I., Ishii, T., Kuze, M., Nakao, M., Tokushuku, K., Yamada, S., Yamazaki, Y., An, S. H., Lee, S. B., Nam, S. W., Park, H. S., Park, S. K., Barreiro, F., Fernandez, J. P., Graciani, R., Hernández, J. M., Hervás, L., Labarga, L., Martinez, M., Del Peso, J., Puga, J., Terron, J., Trocóniz, J. F., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Murray, W. N., Ochs, A., Riveline, M., Stairs, D. G., St-Laurent, M., Ullmann, R., Tsurugai, T., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Golubkov, Yu A., Khein, L. A., Korotkova, N. A., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Yu, Proskuryakov, A. S., Shcheglova, L. M., Shumilin, A. V., Solomin, A. N., Zotkin, S. A., Bokel, C., Botje, M., Brümmer, N., Chlebana, F., Engelen, J., Kooijman, P., Kruse, A., Sighem, A., Tiecke, H., Verkerke, W., Vossebeld, J., Vreeswijk, M., Wiggers, L., Wolf, E., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Ginsburg, C. M., Kim, C. L., Ling, T. Y., Nylander, P., Romanowski, T. A., Blaikley, H. E., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Edmonds, J. K., Harnew, N., Mark Lancaster, Mcfall, J. D., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Yip, T., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Feild, R. G., Oh, B. Y., Okrasiński, J. R., Whitmore, J. J., Iga, Y., D Agostini, G., Marini, G., Nigro, A., Raso, M., Hart, J. C., Mccubbin, N. A., Shah, T. P., Barberis, E., Dubbs, T., Heusch, C., Hook, M., Lockman, W., Rahn, J. T., Sadrozinski, H. F. -W, Seiden, A., Williams, D. C., Schwarzer, O., Walenta, A. H., Abramowicz, H., Briskin, G., Dagan, S., Doeker, T., Kananov, S., Levy, A., Abe, T., Inuzuka, M., Nagano, K., Suzuki, I., Umemori, K., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Matsushita, T., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Maselli, S., Monaco, V., Peroni, C., Petrucci, M. C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Brkic, M., Fagerstroem, C. -P, Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sampson, C. R., Simmons, D., Teuscher, R. J., Butterworth, J. M., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Sutton, M. R., Lu, B., Mo, L. W., Ciborowski, J., Grzelak, G., Kasprzak, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Pawlak, R., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Adamus, M., Coldewey, C., Eisenberg, Y., Hochman, D., Karshon, U., Revel, D., Badgett, W. F., Chapin, D., Cross, R., Dasu, S., Foudas, C., Loveless, R. J., Mattingly, S., Reeder, D. D., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Bhadra, S., Frisken, W. R., Khakzad, M., Schmidke, W. B., and Zeus (IHEF, IoP, FNWI)
Subjects: Particle physics, Photon, Physics and Astronomy (miscellaneous), Proton, FOS: Physical sciences, 01 natural sciences, Dissociation (chemistry), High Energy Physics - Experiment, Pomeron, High Energy Physics - Experiment (hep-ex), MONTE-CARLO, 0103 physical sciences, DISTRIBUTIONS, 010306 general physics, Nuclear Experiment, Physics, ZEUS (particle detector), hep-ex, 010308 nuclear & particles physics, OF-MASS ENERGY, High Energy Physics::Phenomenology, ZEUS, ZEUS BARREL CALORIMETER, HERA, Nuclear & Particles Physics, Amplitude, HADRONIC PROCESSES, CROSS-SECTION, Mass spectrum, High Energy Physics::Experiment
Abstract: Diffractive dissociation of quasi-real photons at a photon-proton centre of mass energy of W ~ 200 GeV is studied with the ZEUS detector at HERA. The process under consideration is gamma p -> X N, where X is the diffractively dissociated photon system of mass M_X and N is either a proton or a nucleonic system with mass M_N < 2GeV. The cross section for this process in the interval 3 < M_X < 24 GeV relative to the total photoproduction cross section was measured to be sigma^partial_D / sigma_tot = 6.2 +- 0.2(stat) +- 1.4(syst)%. After extrapolating this result to the mass interval of m_phi^2 < M_X^2 < 0.05 W^2 and correcting it for proton dissociation, the fraction of the total cross section attributed to single diffractive photon dissociation, gamma p -> X p, is found to be sigma_SD / sigma_tot = 13.3 +- 0.5(stat) +- 3.6(syst)%. The mass spectrum of the dissociated photon system in the interval 8 < M_X < 24 GeV can be described by the triple pomeron (PPP) diagram with an effective pomeron intercept of alpha_P(0) = 1.12 +- 0.04(stat) +- 0.08(syst). The cross section for photon dissociation in the range 3 < M_X < 8 GeV is significantly higher than that expected from the triple pomeron amplitude describing the region 8 < M_X < 24 GeV. Assuming that this discrepancy is due to a pomeron-pomeron-reggeon (PPR) term, its contribution to the diffractive cross section in the interval 3 < M_X < 24 GeV is estimated to be f_PPR = 26 +- 3(stat) +- 12(syst)%., 29 pages including 9 figures
Published: 1997

11. Measurement of Elastic omega Photoproduction at HERA

Author: Derrick, M, Krakauer, D, Magill, S, Mikunas, D, Musgrave, B, Okrasinski, J R, Repond, J, Stanek, R, Talaga, R L, Zhang, H, Mattingly, M C K, Anselmo, F, Antonioli, P, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Bruni, P, Romeo, G C, Castellini, G, Cifarelli, L, Cindolo, F, Contin, A, Corradi, M, Gialas, I, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Margotti, A, Massam, T, Nania, R, Palmonari, F, Pesci, A, Polini, A, Sartorelli, G, Garcia, Y Z, Zichichi, A, Amelung, C, Bornheim, A, Crittenden, J, Deffner, R, Eckert, M, Feld, L, Frey, A, Geerts, M, Grothe, M, Hartmann, H, Heinloth, K, Heinz, L, Hilger, E, Jakob, H P, Katz, U F, Mengel, S, Paul, E, Pfeiffer, M, Rembser, C, Schramm, D, Stamm, J, Wedemeyer, R, CampbellRobson, S, Cassidy, A, Cottingham, W N, Dyce, N, Foster, B, George, Simon, Hayes, M E, Heath, G P, Heath, H F, Piccioni, D, Roff, D G, Tapper, R J, Yoshida, R, Arneodo, M, Ayad, R, Capua, M, Garfagnini, A, Iannotti, L, Schioppa, M, Susinno, G, Caldwell, A, Cartiglia, N, Jing, Z, Liu, W, Parsons, J A, Ritz, S, Sciulli, F, Straub, P B, Wai, L, Yang, S, Zhu, Q, Borzemski, P, Chwastowski, J, Eskreys, A, Jakubowski, Z, Przybycien, M B, Zachara, M, Zawiejski, L, Adamczyk, L, Bednarek, B, Jelen, K, Kisielewska, D, Kowalski, T, Przybycien, M, RulikowskaZarebska, E, Suszycki, L, Zajac, J, Dulinski, Z, Kotanski, A, Abbiendi, G, Bauerdick, L A T, Behrens, U, Beier, H, Bienlein, J K, Cases, G, Deppe, O, Desler, K, Drews, G, Flasinski, M, Gilkinson, D J, Glasman, C, Gottlicher, P, GrosseKnetter, J, Haas, T, Hain, W, Hasell, D, Hessling, H, Iga, Y, Johnson, K F, Joos, P, Kasemann, M, Klanner, R, Koch, W, Kotz, U, Kowalski, H, Labs, J, Ladage, A, Lohr, B, Lowe, M, Luke, D, Mainusch, J, Manczak, O, Milewski, J, Monteiro, T, Ng, J S T, Notz, D, Ohrenberg, K, Piotrzkowski, K, Roco, M, Rohde, M, Roldan, J, Schneekloth, U, Schulz, W, Selonke, F, Surrow, B, Tassi, E, Voss, T, Westphal, D, Wolf, G, Wollmer, U, Youngman, C, Zeuner, W, Grabosch, H J, Mari, S M, Meyer, A, Schlenstedt, S, Barbagli, G, Gallo, E, Pelfer, P, Maccarrone, G, DePasquale, S, Votano, L, Bamberger, A, Eisenhardt, S, Trefzger, T, Wolfle, S, Bromley, J T, Brook, N H, Bussey, P J, Doyle, A T, Saxon, D H, Sinclair, L E, Strickland, E, Utley, M L, Waugh, R, Wilson, A S, Dannemann, A, Holm, U, Horstmann, D, Sinkus, R, Wick, K, Burow, B D, Hagge, L, Lohrmann, E, Poelz, G, Schott, W, Zetsche, F, Bacon, T C, Brummer, N, Butterworth, I, Harris, V L, Howell, G, Hung, B H U, Lamberti, L, Long, K R, Miller, D B, Pavel, N, Prinias, A, Sedgbeer, J K, Sideris, D, Whitfield, A F, Mallik, U, Wang, M Z, Wang, S M, Wu, J T, Cloth, P, Filges, D, An, S H, Cho, G H, Ko, B J, Lee, S B, Nam, S W, Park, H S, Park, S K, Kartik, S, Kim, H J, McNeil, R R, Metcalf, W, Nadendla, V K, Barreiro, F, Fernandez, J P, Graciani, R, Hernandez, J M, Hervas, L, Labarga, L, Martinez, M, delPeso, J, Puga, J, Terron, J, deTroconiz, J F, Corriveau, F, Hanna, D S, Hartmann, J, Hung, L W, Lim, J N, Matthews, C G, Murray, W N, Ochs, A, Patel, P M, Riveline, M, Stairs, D G, StLaurent, M, Ullmann, R, Zacek, G, Tsurugai, T, Bashkirov, V, Dolgoshein, B A, Stifutkin, A, Bashindzhagyan, G L, Ermolov, P F, Gladilin, L K, Golubkov, Y A, Kobrin, V D, Korzhavina, L A, Kuzmin, V A, Lukina, O Y, Proskuryakov, A S, Savin, A A, Shcheglova, L M, Solomin, A N, Zotov, N P, Botje, M, Chlebana, F, Engelen, J, deKamps, M, Kooijman, P, Kruse, A, vanSighem, A, Tiecke, H, Verkerke, W, Vossebeld, J, Vreeswijk, M, Wiggers, L, deWolf, E, vanWoudenberg, R, Acosta, D, Bylsma, B, Durkin, L S, Gilmore, J, Ginsburg, C M, Kim, C L, Li, C, Ling, T Y, Nylander, P, Park, I H, Romanowski, T A, Bailey, D S, Cashmore, R J, CooperSarkar, A M, Devenish, R C E, Harnew, N, Lancaster, M, Lindemann, L, McFall, J D, Nath, C, Noyes, V A, Quadt, A, Tickner, J R, Uijterwaal, H, Walczak, R, Waters, D S, Wilson, F F, Yip, T, Bertolin, A, Brugnera, R, Carlin, R, DalCorso, F, DeGiorgi, M, Dosselli, U, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Zuin, F, Bulmahn, J, Feild, R G, Oh, B Y, Whitmore, J J, DAgostini, G, Marini, G, Nigro, A, Hart, J C, McCubbin, N A, Shah, T P, Barberis, E, Dubbs, T, Heusch, C, VanHook, M, Lockman, W, Rahn, J T, Sadrozinski, H F W, Seiden, A, Williams, D C, Biltzinger, J, Seifert, R J, Schwarzer, O, Walenta, A H, Abramowicz, H, Briskin, G, Dagan, S, Doeker, T, Levy, A, Fleck, J I, Inuzuka, M, Ishii, T, Kuze, M, Mine, S, Nakao, M, Suzuki, I, Tokushuku, K, Umemori, K, Yamada, S, Yamazaki, Y, Chiba, M, Hamatsu, R, Hirose, T, Homma, K, Kitamura, S, Matsushita, T, Yamauchi, K, Cirio, R, Costa, M, Ferrero, M I, Maselli, S, Peroni, C, Sacchi, R, Solano, A, Staiano, A, Dardo, M, Bailey, D C, Benard, F, Brkic, M, Fagerstroem, C P, Hartner, G F, Joo, K K, Levman, G M, Martin, J F, Orr, R S, Polenz, S, Sampson, C R, Simmons, D, Teuscher, R J, Butterworth, J M, Catterall, C D, Jones, T W, Kaziewicz, P B, Lane, J B, Saunders, R L, Shulman, J, Sutton, M R, Lu, B, Mo, L W, Bogusz, W, Ciborowski, J, Gajewski, J, Grzelak, G, Kasprzak, M, Krzyzanowski, M, Muchorowski, K, Nowak, R J, Pawlak, J M, Tymieniecka, T, Wroblewski, A K, Zakrzewski, J A, Zarnecki, A F, Adamus, M, Coldewey, C, Eisenberg, Y, Hochman, D, Karshon, U, Revel, D, ZerZion, D, Badgett, W F, Breitweg, J, Chapin, D, Cross, R, Dasu, S, Foudas, C, Loveless, R J, Mattingly, S, Reeder, D D, Silverstein, S, Smith, W H, Vaiciulis, A, Wodarczyk, M, Bhadra, S, Cardy, M L, Frisken, W R, Khakzad, M, and Schmidke, W B
Subjects: Scattering cross-section, Particle physics, Physics and Astronomy (miscellaneous), Proton, LUND MONTE-CARLO, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, Zeus (malware), Omega, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Low energy, Pion, DESIGN, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Physics, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS, HIGH-ENERGY PHOTOPRODUCTION, CENTRAL TRACKING DETECTOR, ZEUS BARREL CALORIMETER, CONSTRUCTION, HYDROGEN, PHOTON, 010308 nuclear & particles physics, Faculty of Science\Physics, High Energy Physics::Phenomenology, HERA, Helicity, High Energy Physics::Experiment
Abstract: The reaction $\gamma p \rightarrow \omega p$ $(\omega \rightarrow \pi^+\pi^-\pi^0$ and $\pi^0\rightarrow\gamma\gamma)$ has been studied in $ep$ interactions using the ZEUS detector at photon-proton centre-of-mass energies between $70$ and $90 GeV$ and $|t| < 0.6 GeV^2$, where $t$ is the squared four momentum transferred at the proton vertex.The elastic \ome photoproduction cross section has been measured to be $\sigma_{\gamma p\rightarrow \omega p} = 1.21\pm 0.12\pm 0.23 \mu b$. The differential cross section $d\sigma_{\gamma p\rightarrow \omega p} /d|t|$ has an exponential shape $e^{-b |t|}$ with a slope $b = 10.0\pm 1.2\pm 1.3 GeV^{-2}$. The angular distributions of the decay pions are consistent with s-channel helicity conservation. When compared to low energy data, the features of $\omega$ photoproduction as measured at HERA energies are in agreement with those of a soft diffractive process. Previous measurements of the $\rho^0$ and $\phi$ photoproduction cross sections at HERA show a similar behaviour., Comment: 32 pages including 7 figures Various changes throughout the text of paper
Published: 1996

12. Observation of events with an energetic forward neutron in deep inelastic scattering at HERA

Author: Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Okrasinski, J. R., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Mattingly, M. C. K., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, R., Cara Romeo, G., Guido Castellini, Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, R., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Polini, A., Sartorelli, G., Zamora Garcia, Y., Zichichi, A., Amelung, C., Bornheim, A., Crittenden, J., Deffner, R., Doeker, T., Eckert, M., Feld, L., Frey, A., Geerts, M., Grothe, M., Hartmann, H., Heinloth, K., Heinz, L., Hilger, E., Jakob, H. -P, Katz, U. F., Mengel, S., Paul, E., Pfeiffer, M., Rembser, C., Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Cottingham, W. N., Dyce, N., Foster, B., George, S., Hayes, M. E., Heath, G. P., Heath, H. F., Piccioni, D., Roff, D. G., Tapper, R. J., Yoshida, R., Arneodo, M., Ayad, R., Capua, M., Garfagnini, A., Iannotti, L., Schioppa, M., Susinno, G., Caldwell, A., Cartiglia, N., Jing, Z., Liu, W., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Jakubowski, Z., Przybycień, M. B., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jeleń, K., Kisielewska, D., Kowalski, T., Przybycień, M., Rulikowska-Zarȩbska, E., Suszycki, L., Zajac, J., Duliński, Z., Kotański, A., Abbiendi, G., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Cases, G., Deppe, O., Desler, K., Drews, G., Flasiński, M., Gilkinson, D. J., Glasman, C., Göttlicher, P., Große-Knetter, J., Haas, T., Hain, W., Hasell, D., Heßling, H., Iga, Y., Johnson, K. F., Joos, P., Kasemann, M., Klanner, R., Koch, W., Kötz, U., Kowalski, H., Labs, J., Ladage, A., Löhr, B., Löwe, M., Lüke, D., Mainusch, J., Mańczak, O., Milewski, J., Monteiro, T., Ng, J. S. T., Notz, D., Ohrenberg, K., Piotrzkowski, K., Roco, M., Rohde, M., Roldán, J., Schneekloth, U., Schulz, W., Selonke, F., Surrow, B., Voß, T., Westphal, D., Wolf, G., Wollmer, U., Youngman, C., Zeuner, W., Grabosch, H. J., Kharchilava, A., Mari, S. M., Meyer, A., Schlenstedt, S., Wulff, N., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, G., Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Trefzger, T., Wölfle, S., Bromley, J. T., Brook, N. H., Bussey, P. J., Doyle, A. T., Saxon, D. H., Sinclair, L. E., Utley, M. L., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Sinkus, R., Wick, K., Burow, B. D., Hagge, L., Lohrmann, E., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Brümmer, N., Butterworth, I., Harris, V. L., Howell, G., Hung, B. H. Y., Lamberti, L., Long, K. R., Miller, D. B., Pavel, N., Prinias, A., Sedgbeer, J. K., Sideris, D., Whitfield, A. F., Mallik, U., Wang, M. Z., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., An, S. H., Cho, G. H., Ko, B. J., Lee, S. B., Nam, S. W., Park, H. S., Park, S. K., Kartik, S., Kim, H. -J, Mcneil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Fernandez, J. P., Graciani, R., Hernández, J. M., Hervás, L., Labarga, L., Martinez, M., Del Peso, J., Puga, J., Terron, J., Trocóniz, J. F., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Patel, P. M., Riveline, M., Stairs, D. G., St-Laurent, M., Ullmann, R., Zacek, G., Tsurugai, T., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Y. A., Kobrin, V. D., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Y., Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Engelen, J., Kamps, M., Kooijman, P., Kruse, A., Sighem, A., Tiecke, H., Verkerke, W., Vossebeld, J., Vreeswijk, M., Wiggers, L., Wolf, E., Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Li, C., Ling, T. Y., Nylander, P., Park, I. H., Romanowski, T. A., Bailey, D. S., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Harnew, N., Lancaster, M., Lindemann, L., Mcfall, J. D., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Wilson, F. F., Yip, T., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Zuin, F., Bulmahn, J., Feild, R. G., Oh, B. Y., Whitmore, J. J., D Agostini, G., Marini, G., Nigro, A., Tassi, E., Hart, J. C., Mccubbin, N. A., Shah, T. P., Barberis, E., Dubbs, T., Heusch, C., Hook, M., Lockman, W., Rahn, J. T., Sadrozinski, H. F. -W, Seiden, A., Williams, D. C., Bíltzinger, J., Seifert, R. J., Schwarzer, O., Walenta, A. H., Zech, G., Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Fleck, J. I., Inuzuka, M., Ishii, T., Kuze, M., Mine, S., Nakao, M., Suzuki, I., Tokushuku, K., Umemori, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Matsushita, T., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Benard, F., Brkic, M., Fagerstroem, C. -P, Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sampson, C. R., Simmons, D., Teuscher, R. J., Butterworth, J. M., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Sutton, M. R., Lu, B., Mo, L. W., Bogusz, W., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Coldewey, C., Eisenberg, Y., Hochman, D., Karshon, U., Revel, D., Zer-Zion, D., Badgett, W. F., Breitweg, J., Chapin, D., Cross, R., Dasu, S., Foudas, C., Loveless, R. J., Mattingly, S., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Bhadra, S., Cardy, M. L., Frisken, W. R., Furutani, K. M., Khakzad, M., Murray, W. N., Schmidke, W. B., and ZEUS at HERA (IHEF, IoP, FNWI)
Subjects: Nuclear and High Energy Physics, Particle physics, Proton, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Neutron, CALORIMETER, 010306 general physics, Nuclear Experiment, Physics, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), Neutral current, 010308 nuclear & particles physics, Scattering, Faculty of Science\Physics, Mathematics::History and Overview, ZEUS, HERA, Deep inelastic scattering, LARGE RAPIDITY GAP, High Energy Physics::Experiment, Center of mass
Abstract: In deep inelastic neutral current scattering of positrons and protons at the center of mass energy of 300 GeV, we observe, with the ZEUS detector, events with a high energy neutron produced at very small scattering angles with respect to the proton direction. The events constitute a fixed fraction of the deep inelastic, neutral current event sample independent of Bjorken $x$ and $Q^2$ in the range $ 3 \cdot 10^{-4} < \xbj < 6\cdot 10^{-3}$ and $10 < Q^2, PS file including 4 figures First replacement due to display problems with fig. 3. Contents of paper unchanged
Published: 1996

13. MEASUREMENT OF ELASTIC P(0) PHOTOPRODUCTION AT HERA

Author: Derrick, M., Krakauer, D., Bari, G., Zawiejski, L., Adamczyk, L., Bednarek, B., Jelen, K., Kisielewska, D., Kowalski, T., Rulikowska-Zarebska, E., Suszycki, L., Zajac, J., Kotanski, A., Basile, M., Przybycien, M., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Coldewey, C., Deppe, O., Desler, K., Drews, G., Flasinski, M., Bellagamba, L., Gilkinson, D. J., Glasman, C., Gottlicher, P., Grosse-Knetter, J., Gutjahr, B., Haas, Tobias M., Hain, W., Hasell, D., Hessling, H., Iga, Y., Boscherini, D., Johnson, K., Joos, P., Kasemann, M., Klanner, R., Koch, W., Kopke, L., Kotz, U., Kowalski, H., Labs, J., Ladage, A., Bruni, A., Lohr, B., Lowe, M., Luke, D., Mainusch, J., Manczak, O., Monteiro, T., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Bruni, G., Roco, M., Rohde, M., Roldan, J., Schneekloth, U., Schulz, W., Selonke, F., Stiliaris, E., Surrow, B., Voss, T., Westphal, D., Bruni, P., Wolf, G., Youngman, C., Zeuner, W., Zhou, J. F., Grabosch, H. J., Kharchilava, A., Leich, A., Mattingly, M., Mari, S. M., Meyer, A., Cara Romeo, G., Schlenstedt, S., Wulff, N., Barbagli, G., Pelfer, P., Anzivino, G., Maccarrone, G., De Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Castellini, G., Freidhof, A., Soldner-Rembold, S., Schroeder, J., Trefzger, T., Brook, N. H., Bussey, P. J., Doyle, A. T., Saxon, D. H., Utley, M. L., Wilson, A. S., Chiarini, M., Dannemann, A., Holm, U., Horstmann, D., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Hagge, L., Lohrmann, E., Magill, S., Cifarelli, L., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Brummer, N., Butterworth, I., Gallo, E., Cindolo, F., Harris, V. L., Hung, B. H. Y., Long, K. R., Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A., Mallik, U., McCliment, E., Contin, A., Wang, M. Z., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., An, S. H., Hong, S. M., Nam, S. W., Park, S. K., Suh, M. H., Corradi, M., Yon, S. H., Imlay, R., Kartik, S., Kim, H. J., McNeil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Fernandez, J. P., Gialas, I., Graciani, R., Hernandez, J. M., Hervas, L., Labarga, L., Martinez, M., del Peso, J., Puga, J., Terron, J., de Troconiz, J. F., Smith, G. R., Giusti, P., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C., Patel, P. M., Sinclair, L. E., Stairs, D. G., St. Laurent, M., Iacobucci, G., Ullmann, R., Zacek, G., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagian, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Yu. A., Kobrin, V. D. D., Laurenti, G., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Yu., Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Levi, G., Dake, A., Engelen, J., de Kamps, M., Kooijman, P., Kruse, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., de Wolf, E., Margotti, A., van Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Honscheid, K., Li, C., Ling, T. Y., McLean, K. W., Murray, W. N., Mikunas, D., Massam, T., Nylander, P., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, David C., Byrne, J., Cashmore, R. J., Cooper-Sarkar, Amanda M., Devenish, R. C. E., Harnew, N., Nania, R., Lancaster, M., Lindemann, L., McFall, J., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Nemoz, C., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., De Giorgi, M., Dosselli, U., Limentani, S., Palmonari, F., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Whitmore, J., Polini, A., D'Agostini, G., Marini, G., Nigro, A., Tassi, E., Hart, J. C., McCubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Sartorelli, G., Dubbs, T., Heusch, C., Van Hook, M., Lockman, William S., Rahn, J. T., Sadrozinski, H. F., Seiden, A., Williams, D. C., Biltzinger, J., Seifert, R. J., Timellini, R., Schwarzer, O., Walenta, A. H., Zech, Gunter, Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Fleck, J. I., Hasegawa, T., Hazumi, M., Zamora Garcia, Y., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Zichichi, A., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nakamitsu, Y., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Bargende, A., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bandyopadhyay, D., Benard, F., Brkic, M., Musgrave, B., Bornheim, A., Gingrich, D. M., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sampson, Cortney R., Teuscher, R. J., Catterall, C. D., Crittenden, J., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Lu, B., Mo, L. W., Bogusz, W., Charchula, K., Desch, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wroblewski, A. K., Diekmann, B., Zakrzewski, Janusz Andrzej, Zarnecki, A. F., Adamus, M., Eisenberg, Y., Karshon, U., Revel, D., Zer-Zion, D., Ali, I., Badgett, W. F., Behrens, B., Doeker, T., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Eckert, M., Tsurugai, T., Bhadra, S., Cardy, M. L., Fagerstroem, C. P., Frisken, William R., Furutani, K. M., Khakzad, M., Schmidke, W. B., ZEUS Collaboration, Feld, L., Frey, A., Geerts, M., Grothe, M., Repond, J., Hartmann, H., Heinloth, K., Hilger, E., Jakob, H. P., Katz, U. F., Mengel, S., Mollen, J., Paul, E., Pfeiffer, M., Rembser, C., Stanek, R., Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Dyce, N., Foster, B., George, S., Gilmore, R., Heath, G. P., Talaga, R. L., Heath, Helen F., Llewellyn, T. J., Morgado, C. J. S., Norman, D. J. P., O'Mara, J. A., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, M., Zhang, H., Capua, M., Garfagnini, A., Iannotti, L., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Cartiglia, N., Parsons, J. A., Ritz, S., Ayad, R., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., and Zeus (IHEF, IoP, FNWI)
Subjects: Photon, Physics and Astronomy (miscellaneous), Proton, (pi+ pi-) [mass spectrum], 60-80 GeV-cms (photon), rho(770)0 [polarization], elastic scattering, rho(770) p [elastic scattering], 01 natural sciences, High Energy Physics - Experiment, MUON-PROTON-SCATTERING, differential cross section [energy dependence], Invariant mass, ZEUS, HIGH-ENERGY PHOTOPRODUCTION, DEEP INELASTIC-SCATTERING, CENTRAL TRACKING DETECTOR, ZEUS BARREL CALORIMETER, LUND MONTE-CARLO, HADRONIC PROPERTIES, PHOTON, CONSTRUCTION, HYDROGEN, Nuclear Experiment, colliding beams [electron p], Physics, HERA, electron p [colliding beams], Helicity, polarization [rho(770)0], DESY HERA Stor, differential cross section, mass spectrum [(pi+ pi-)], photoproduction, Particle physics, interaction [photon p], transverse [polarization], rho(770)0 [photoproduction], Nuclear physics, Pion, photon p [interaction], 0103 physical sciences, ddc:530, elastic scattering [rho(770) p], 010306 general physics, channel cross section, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), 010308 nuclear & particles physics, Faculty of Science\Physics, High Energy Physics::Phenomenology, bibliography, Deep inelastic scattering, conservation law [helicity], photoproduction [rho(770)0], polarization [transverse], energy dependence [differential cross section], High Energy Physics::Experiment, experimental results
Abstract: Elastic $\rho^0$ photoproduction has been measured using the ZEUS detector at HERA. Untagged photoproduction events from $ep$ interactions were used to measure the reaction $\gamma p \rightarrow \rho^0 p$ ($\rho^0 \rightarrow \pi^+ \pi^-$) at photon-proton centre-of-mass energies between 60 and 80~GeV and $|t, Comment: 38 pages, latex, 10 figures appended as uuencoded file. This manuscript replaces the one which had a non standard style file
Published: 1995
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14. Diffractive Hard Photoproduction at HERA and Evidence for the Gluon Content of the Pomeron

Author: David Bailey, Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Ayad, R., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Chiarini, M., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Nemoz, C., Palmonari, F., Polini, A., Sartorelli, G., Timellini, R., Zamora Garcia, Y., Zichichi, A., Bargende, A., Crittenden, J., Desch, K., Diekmann, B., Doeker, T., Eckert, M., Feld, L., Frey, A., Geerts, M., Grothe, M., Hartmann, H., Heinloth, K., Hilger, E., Jakob, H. P., Katz, U. F., Mari, S. M., Mengel, S., Mollen, J., Paul, E., Pfeiffer, M., Ch Rembser, Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Dyce, N., Foster, B., George, S., Gilmore, R., Heath, G. P., Heath, H. F., Llewellyn, T. J., Morgado, C. J. S., Norman, D. J. P., Mara, J. A. O., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, M., Capua, M., Garfagnini, A., Iannotti, L., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Cartiglia, N., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jeleń, K., Kisielewska, D., Kowalski, T., Rulikowska-Zarȩbska, E., Suszycki, L., Zaja̧c, J., Kotański, A., Przybycień, M., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Coldewey, C., Deppe, O., Desler, K., Drews, G., Flasiński, M., Gilkinson, D. J., Glasman, C., Göttlicher, P., Große-Knetter, J., Gutjahr, B., Haas, T., Hain, W., Hasell, D., Heßling, H., Iga, Y., Johnson, K., Joos, P., Kasemann, M., Klanner, R., Koch, W., Köpke, L., Kötz, U., Kowalski, H., Labs, J., Ladage, A., Löhr, B., Löwe, M., Lüke, D., Mainusch, J., Mańczak, O., Monteiro, T., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Roco, M., Rohde, M., Roldán, J., Schneekloth, U., Schulz, W., Selonke, F., Stiliaris, E., Surrow, B., Voß, T., Westphal, D., Wolf, G., Youngman, C., Zeuner, W., Zhou, J. F., Grabosch, H. J., Kharchilava, A., Leich, A., Mattingly, M. C. K., Meyer, A., Schlenstedt, S., Wulff, N., Barbagli, G., Pelfer, P., Anzivino, G., Maccarrone, G., Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Freidhof, A., Stefan Soldner-Rembold, Schroeder, J., Trefzger, T., Brook, N. H., Bussey, P. J., Doyle, A. T., Fleck, J. I., Saxon, D. H., Utley, M. L., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Hagge, L., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Bruemmer, N., Butterworth, I., Gallo, E., Harris, V. L., Hung, B. Y. H., Long, K. R., Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A. F., Mallik, U., Mccliment, E., Wang, M. Z., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., An, S. H., Hong, S. M., Nam, S. W., Park, S. K., Suh, M. H., Yon, S. H., Imlay, R., Kartik, S., Kim, H. J., Mcneil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Fernandez, J. P., Graciani, R., Hernández, J. M., Hervás, L., Labarga, L., Martinez, M., Del Peso, J., Puga, J., Terron, J., Trocóniz, J. F., Smith, G. R., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Patel, P. M., Sinclair, L. E., Stairs, D. G., St Laurent, M., Ullmann, R., Zacek, G., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Yu A., Kobrin, V. D., Korzhavina, I. A., Kuzmin, V. A., Yu Lukina, O., Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Dake, A., Engelen, J., Kamps, M., Kooijman, P., Kruse, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., Wolf, E., Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Honscheid, K., Li, C., Ling, T. Y., Mclean, K. W., Murray, W. N., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, D. S., Byrne, A., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Harnew, N., Lancaster, M., Lindemann, L., Mcfall, J. D., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Whitmore, J. J., Agostini, G. D., Marini, G., Nigro, A., Tassi, E., Hart, J. C., Mccubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Dubbs, T., Heusch, C., Hook, M., Lockman, W., Rahn, J. T., Sadrozinski, H. F. W., Seiden, A., Williams, D. C., Biltzinger, J., Seifert, R. J., Schwarzer, O., Walenta, A. H., Zech, G., Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Hasegawa, T., Hazumi, M., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nakamitsu, Y., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Bandyopadhyay, D., Benard, F., Brkic, M., Crombie, M. B., Gingrich, D. M., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sampson, C. R., Teuscher, R. J., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Lu, B., Mo, L. W., Bogusz, W., Charchuła, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Eisenberg, Y., Karshon, U., Revel, D., Zer-Zion, D., Ali, I., Badgett, W. F., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Tsurugai, T., Bhadra, S., Cardy, M. L., Fagerstroem, C. P., Frisken, W. R., Furutani, K. M., Khakzad, M., Schmidke, W. B., and Zeus (IHEF, IoP, FNWI)
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, LUND MONTE-CARLO, Regge phenomenology, PARTON DISTRIBUTIONS, QUARK INTERACTIONS, JET FRAGMENTATION, E+E-PHYSICS, SCATTERING, EVENTS, DISSOCIATION, CALORIMETER, ZEUS, FOS: Physical sciences, Parton, cross section measurement, pomeron exchange, deep inelastic scattering, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pomeron, 0103 physical sciences, Rapidity, 010306 general physics, Nuclear Experiment, Physics, Quantum chromodynamics, Research Groups and Centres\Physics\Low Temperature Physics, 010308 nuclear & particles physics, Faculty of Science\Physics, High Energy Physics::Phenomenology, HERA, Deep inelastic scattering, Gluon, High Energy Physics::Experiment
Abstract: Inclusive jet cross sections for events with a large rapidity gap with respect to the proton direction from the reaction $ep \rightarrow jet \; + \; X$ with quasi-real photons have been measured with the ZEUS detector. The cross sections refer to jets with transverse energies $E_T^{jet}>8$~GeV. The data show the characteristics of a diffractive process mediated by pomeron exchange. Assuming that the events are due to the exchange of a pomeron with partonic structure, the quark and gluon content of the pomeron is probed at a scale $\sim (E_T^{jet})^2$. A comparison of the measurements with model predictions based on QCD plus Regge phenomenology requires a contribution of partons with a hard momentum density in the pomeron. A combined analysis of the jet cross sections and recent ZEUS measurements of the diffractive structure function in deep inelastic scattering gives the first experimental evidence for the gluon content of the pomeron in diffractive hard scattering processes. The data indicate that between 30\% and 80\% of the momentum of the pomeron carried by partons is due to hard gluons., 25 pages, latex, 4 figures appended as uuencoded file. No change w.r.t. previous version (just avoiding warning latex messages while processing)
Published: 1995

15. Observation of Direct Processes In Photoproduction At Hera

Author: Derrick, M., Krakauer, D., Ayad, R., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Eskreys, K., Jeleń, K., Kisielewska, D., Kowalski, T., Rulikowska-Zarȩbska, E., Bari, G., Suszycki, L., Zaja̧c, J., Kȩdzierski, T., Kotański, A., Przybycień, M., Bauerdick, L. A. T., Behrens, U., Bienlein, J. K., Böttcher, S., Coldewey, C., Basile, M., Drews, G., Flasiński, M., Fleck, I., Gilkinson, D. J., Göttlicher, P., Gutjahr, B., Haas, T., Hagge, L., Hain, W., Hasell, D., Bellagamba, L., Heβling, H., Hultschig, H., Joos, P., Kasemann, M., Klanner, R., Koch, W., Köpke, L., Kötz, U., Kowalski, H., Kröger, W., Boscherini, D., Krüger, J., Labs, J., Ladage, A., Löhr, M., Löwe, M., Lüke, D., Mainusch, J., Mańczak, O., Momayezi, M., Ng, J. S. T., Bruni, A., Nickel, S., Notz, D., Pösnecker, K.-U., Rohde, M., Roldán, J., Schneekloth, U., Schroeder, J., Schulz, W., Selonke, F., Stiliaris, E., Bruni, G., Tsurugai, T., Vogel, W., Westphal, D., Wolf, G., Youngman, C., Grabosch, H. J., Leich, A., Meyer, A., Rethfeldt, C., Schlenstedt, S., Bruni, P., Barbagli, G., Nuti, M., Pelfer, P., Anzivino, G., De Pasquale, S., Qian, S., Votano, L., Bamberger, A., Freidhof, A., Poser, T., Cara Romeo, G., Söldner-Rembold, S., Theisen, G., Trefzger, T., Brook, N. H., Bussey, P. J., Doyle, A. T., Forbes, J. R., Jamieson, V. A., Raine, C., Saxon, D. H., Castellini, G., Stavrianakou, M., Wilson, A. S., Brückmann, H., Dannemann, A., Holm, U., Horstmann, D., Kammerlocher, H., Krebs, B., Neumann, T., Sinkus, R., Magill, S., Chiarini, M., Wick, K., Fürtjes, A., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Terron, J., Zetsche, F., Cifarelli, L., Bacon, T. C., Butterworth, I., Beuselinck, R., Gallo, E., Harris, V. L., Long, K. R., Miller, D. B., Prinias, A., Sedgbeer, J. K., Vorvolakos, A., Cindolo, F., Whitfield, A., Bienz, T., Kreutzmann, H., Mallik, U., McCliment, E., Roco, M., Wang, M. Z., Cloth, P., Filges, D., An, S. H., Ciralli, F., Hong, S. M., Kim, C. O., Kim, T. Y., Nam, S. W., Park, S. K., Suh, M. H., Yon, S. H., Imlay, R., Kartik, S., Kim, H.-J., Contin, A., McNeil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Hervás, L., Labarga, L., del Peso, J., de Trocóniz, J. F., Ikraiam, F., Del Papa, C., Mayer, J. K., Smith, G. R., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Mitchell, J. W., Patel, P. M., D'Auria, S., Sinclair, L. E., Stairs, D. G., Laurent, M. St., Ullmann, R., Bashindzhagyan, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Y. A., Kuzmin, V. A., Kuznetsov, E. N., Frasconi, F., Savin, A. A., Voronin, A. G., Zotov, N. P., Bentvelsen, S., Botje, M., Dake, A., Engelen, J., de Jong, P., de Kamps, M., Kooijman, P., Giusti, P., Kruse, A., van der Lugt, H., O'Dell, V., Tenner, A., Tiecke, H., Uijterwaal, H., Vreeswijk, M., Wiggers, L., de Wolf, E., van Woudenberg, R., Iacobucci, G., Bylsma, B., Durkin, L. S., Honscheid, K., Li, C., Ling, T. Y., McLean, K. W., Murray, W. N., Park, I. H., Romanowski, T. A., Seidlein, R., Musgrave, B., Laurenti, G., Bailey, D., Blair, G. A., Byrne, A., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Harnew, N., Khatri, T., Luffman, P., Morawitz, P., Levi, G., Nash, J., Roocroft, N. C., Walczak, R., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Lin, Q., De Giorgi, M., Dosselli, U., Gasparini, F., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Maccarrone, G., Butterworth, J. M., Feild, R. G., Oh, B. Y., Whitmore, J. J., Contino, U., D'Agostini, G., Guida, M., Iori, M., Mari, S. M., Marini, G., Margotti, A., Mattioli, M., Nigro, A., Hart, J. C., McCubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Cartiglia, N., Heusch, C., Massam, T., Van Hook, M., Hubbard, B., Lockman, W., Sadrozinski, H. F.-W., Seiden, A., Zer-Zion, D., Badura, E., Biltzinger, J., Seifert, R. J., Walenta, A. H., Nania, R., Zech, G., Dagan, S., Levy, A., Hasegawa, T., Hazumi, M., Ishii, T., Kasai, S., Kuze, M., Mine, S., Nagasawa, Y., Nemoz, C., Nagira, T., Nakao, M., Okuno, H., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Palmonari, F., Homma, K., Kitamura, S., Nagayama, S., Nakamitsu, Y., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sartorelli, G., Solano, A., Sacchi, R., Staiano, A., Dardo, M., Bailey, D. C., Bandyopadhyay, D., Benard, F., Bhadra, S., Brkic, M., Burow, B. D., Repond, J., Timellini, R., Chlebana, F. S., Crombie, M. B., Gingrich, D. M., Hartner, G. F., Levman, G. M., Martin, J. F., Orr, R. S., Sampson, C. R., Teuscher, R. J., Bullock, F. W., Zamora Garcia, Y., Catterall, C. D., Giddings, J. C., Jones, T. W., Khan, A. M., Lane, J. B., Makkar, P. L., Shaw, D., Shulman, J., Kochocki, J., Blankenship, K., Zichichi, A., Lu, B., Mo, L. W., Charchuła, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyżanowski, M., Muchorowski, K., Nowak, R. J., Bargende, A., Pawlak, J. M., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Żarnecki, A. F., Adamus, M., Abramowicz, H., Eisenberg, Y., Glasman, C., Karshon, U., Crittenden, J., Montag, A., Revel, D., Shapira, A., Foudas, C., Fordham, C., Loveless, R. J., Goussiou, A., Ali, I., Behrens, B., Dasu, S., Desch, K., Reeder, D. D., Smith, W. H., Silverstein, S., Frisken, W. R., Furutani, K. M., Iga, Y., ZEUS Collaboration, Diekmann, B., Doeker, T., Feld, L., Frey, A., Repond, S., Geerts, M., Geitz, G., Hartmann, H., Haun, D., Heinloth, K., Hilger, E., Jakob, H.-P., Katz, U. F., Kramarczyk, S., Kückes, M., Stanek, R., Mass, A., Mengel, S., Mollen, J., Müsch, H., Paul, E., Schattevoy, R., Schneider, J.-L., Schramm, D., Wedemeyer, R., Cassidy, A., Talaga, R. L., Cussans, D. G., Dyce, N., Foster, B., George, S., Gilmore, R., Heath, G. P., Heath, H. F., Lancaster, M., Llewellyn, T. J., Morgado, C. J. S., Thron, J., O'Mara, J. A., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, M., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Arzarello, F., Gialas, I., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Borzemski, P., Chwastowski, J., Eskreys, A., Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Repond, J, Repond, S, Stanek, R, Talaga, Rl, Thron, J, Arzarello, F, Ayad, R, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Bruni, P, Romeo, Gc, Castellini, G, Chiarini, M, Cifarelli, L, Cindolo, F, Ciralli, F, Contin, A, Delpapa, C, Dauria, S, Frasconi, F, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Lin, Q, Maccarrone, G, Margotti, A, Massam, T, Nania, R, Nemoz, C, Palmonari, F, Sartorelli, G, Timellini, R, Garcia, Yz, Zichichi, A, Bargende, A, Crittenden, J, Desch, K, Diekmann, B, Doeker, T, Feld, L, Frey, A, Geerts, M, Geitz, G, Hartmann, H, Haun, D, Heinloth, K, Hilger, E, Jakob, Hp, Katz, Uf, Kramarczyk, S, Kuckes, M, Mass, A, Mengel, S, Mollen, J, Musch, H, Paul, E, Schattevoy, R, Schneider, Jl, Schramm, D, Wedemeyer, R, Cassidy, A, Cussans, Dg, Dyce, N, Foster, B, George, S, Gilmore, R, Heath, Gp, Heath, Hf, Lancaster, M, Llewellyn, Tj, Morgado, Cj, Omara, Ja, Tapper, Rj, Wilson, S, Yoshida, R, Rau, Rr, Arneodo, M, Schioppa, M, Susinno, G, Bernstein, A, Caldwell, A, Gialas, I, Parsons, Ja, Ritz, S, Sciulli, F, Straub, Pb, Wai, L, Yang, S, Borzemski, P, Chwastowski, J, Eskreys, A, Piotrzkowski, K, Zachara, M, Zawiejski, L, Adamczyk, L, Bednarek, B, Eskreys, K, Jelen, K, Kisielewska, D, Kowalski, T, Rulikowskazarebska, E, Suszycki, L, Zajac, J, Kedzierski, T, Kotanski, A, Przybycien, M, Bauerdick, Lat, Behrens, U, Bienlein, Jk, Bottcher, S, Coldewey, C, Drews, G, Flasinski, M, Fleck, I, Gilkinson, Dj, Gottlicher, P, Gutjahr, B, Haas, T, Hagge, L, Hain, W, Hasell, D, Hessling, H, Hultschig, H, Joos, P, Kasemann, M, Klanner, R, Koch, W, Kopke, L, Kotz, U, Kowalski, H, Kroger, W, Kruger, J, Labs, J, Ladage, A, Lohr, B, Lowe, M, Luke, D, Mainusch, J, Manczak, O, Momayezi, M, Ng, Jst, Nickel, S, Notz, D, Posnecker, Ku, Rohde, M, Roldan, J, Schneekloth, U, Schroeder, J, Schulz, W, Selonke, F, Stiliaris, E, Tsurugai, T, Vogel, W, Westphal, D, Wolf, G, Youngman, C, Grabosch, Hj, Leich, A, Meyer, A, Rethfeldt, C, Schlenstedt, S, Barbagli, G, Nuti, M, Pelfer, P, Anzivino, G, Depasquale, S, Qian, S, Votano, L, Bamberger, A, Freidhof, A, Poser, T, Soldnerrembold, S, Theisen, G, Trefzger, T, Brook, Nh, Bussey, Pj, Doyle, At, Forbes, Jr, Jamieson, Va, Raine, C, Saxon, Dh, Stavrianakou, M, Wilson, A, Bruckmann, H, Dannemann, A, Holm, U, Horstmann, D, Kammerlocher, H, Krebs, B, Neumann, T, Sinkus, R, Wick, K, Furtjes, A, Lohrmann, E, Milewski, J, Nakahata, M, Pavel, N, Poelz, G, Schott, W, Terron, J, Zetsche, F, Bacon, Tc, Beuselinck, R, Butterworth, I, Gallo, E, Harris, Vl, Long, Kr, Miller, Db, Prinias, A, Sedgbeer, Jk, Vorvolakos, A, Whitfield, A, Bienz, T, Kreutzmann, H, Mallik, U, Mccliment, E, Roco, M, Wang, Mz, Cloth, P, Filges, D, An, Sh, Hong, S, Kim, Co, Kim, Ty, Nam, Sw, Park, Sk, Suh, Mh, Yon, Sh, Imlay, R, Kartik, S, Kim, Hj, Mcneil, Rr, Metcalf, W, Nadendla, Vk, Barreiro, F, Cases, G, Hervas, L, Labarga, L, Delpeso, J, Detroconiz, Jf, Ikraiam, F, Mayer, Jk, Smith, Gr, Corriveau, F, Hanna, D, Hartmann, J, Hung, Lw, Lim, Jn, Matthews, Cg, Mitchell, Jw, Patel, Pm, Sinclair, Le, Stairs, Dg, Stlaurent, M, Ullmann, R, Bashindzhagyan, Gl, Ermolov, Pf, Gladilin, Lk, Golubkov, Ya, Kuzmin, Va, Kuznetsov, En, Savin, Aa, Voronin, Ag, Zotov, Np, Bentvelsen, S, Botje, M, Dake, A, Engelen, J, Dejong, P, Dekamps, M, Kooijman, P, Kruse, A, Vanderlugt, H, Odell, V, Tenner, A, Tiecke, H, Uijterwaal, H, Vreeswijk, M, Wiggers, L, Dewolf, E, Vanwoudenberg, R, Bylsma, B, Durkin, L, Honscheid, K, Li, C, Ling, Ty, Mclean, Kw, Murray, Wn, Park, Ih, Romanowski, Ta, Seidlein, R, Bailey, D, Blair, Ga, Byrne, A, Cashmore, Rj, Coopersarkar, Am, Devenish, Rce, Harnew, N, Khatri, T, Luffman, P, Morawitz, P, Nash, J, Roocroft, Nc, Walczak, R, Wilson, Ff, Yip, T, Abbiendi, G, Bertolin, A, Brugnera, R, Carlin, R, Dalcorso, F, Degiorgi, M, Dosselli, U, Gasparini, F, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Bulmahn, J, Butterworth, Jm, Feild, Rg, Oh, By, Whitmore, Jj, Contino, U, Dagostini, G, Guida, M, Iori, M, Mari, Stefano Maria, Marini, G, Mattioli, M, Nigro, A, Hart, Jc, Mccubbin, Na, Prytz, K, Shah, Tp, Short, Tl, Barberis, E, Cartiglia, N, Heusch, C, Vanhook, M, Hubbard, B, Lockman, W, Sadrozinski, Hfw, Seiden, A, Zerzion, D, Badura, E, Biltzinger, J, Seifert, Rj, Walenta, Ah, Zech, G, Dagan, S, Levy, A, Hasegawa, T, Hazumi, M, Ishii, T, Kasai, S, Kuze, M, Mine, S, Nagasawa, Y, Nagira, T, Nakao, M, Okuno, H, Suzuki, I, Tokushuku, K, Yamada, S, Yamazaki, Y, Chiba, M, Hamatsu, R, Hirose, T, Homma, K, Kitamura, S, Nagayama, S, Nakamitsu, Y, Cirio, R, Costa, M, Ferrero, Mi, Lamberti, L, Maselli, S, Peroni, C, Solano, A, Sacchi, R, Staiano, A, Dardo, M, Bailey, Dc, Bandyopadhyay, D, Benard, F, Bhadra, S, Brkic, M, Burow, Bd, Chlebana, F, Crombie, Mb, Gingrich, Dm, Hartner, Gf, Levman, Gm, Martin, Jf, Orr, R, Sampson, Cr, Teuscher, Rj, Bullock, Fw, Catterall, Cd, Giddings, Jc, Jones, Tw, Khan, Am, Lane, Jb, Makkar, Pl, Shaw, D, Shulman, J, Blankenship, K, Kochocki, J, Lu, B, Mo, Lw, Charchula, K, Ciborowski, J, Gajewski, J, Grzelak, G, Kasprzak, M, Krzyzanowski, M, Muchorowski, K, Nowak, Rj, Pawlak, Jm, Tymieniecka, T, Wroblewski, Ak, Zakrzewski, Ja, Zarnecki, Af, Adamus, M, Abramowicz, H, Eisenberg, Y, Glasman, C, Karshon, U, Montag, A, Revel, D, Shapira, A, Foudas, C, Fordham, C, Loveless, Rj, Goussiou, A, Ali, I, Behrens, B, Dasu, S, Reeder, Dd, Smith, Wh, Silverstein, S, Frisken, Wr, Furutani, Km, and Iga, Y.
Subjects: Photon, electron p [deep inelastic scattering], 296 GeV, Elementary particle, photoproduction [jet], Jet (particle physics), law.invention, COLLIDER, hard scattering, MONTE-CARLO, law, photoproduction, jet production, angular distribution, colliding beams [electron p], Physics, DESY DESY HERA Stor Stor, spectrum [transverse energy], HERA, electron p [colliding beams], mass spectrum [(2jet)], jet [photoproduction], photon gluon [fusion], structure function [photon], CENTRAL TRACKING DETECTOR, LEADING-ORDER QCD, PARTON DISTRIBUTIONS, PHOTON, ZEUS, one-photon [exchange], interaction [photon p], Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, transverse energy [spectrum], Nuclear physics, photon p [interaction], ddc:530, Collider, exchange [one-photon], ZEUS (particle detector), Particle accelerator, Photon structure function, rapidity spectrum, (2jet) [mass spectrum], deep inelastic scattering [electron p], High Energy Physics::Experiment, experimental results
Abstract: Jets in photoproduction events have been studied with the ZEUS detector for gammap centre-of-mass energies ranging from 130 to 2 50 GeV. The inclusive jet distributions give evidence for the dominance of resolved photon interactions. In the di-jet sample the direct processes are for the first time clearly isolated. Di-jet cross sections for the resolved and direct processes are given in a restricted kinematic range.
Published: 1994
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16. Dijet cross sections in photoproduction at HERA

Author: David Bailey, Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Ayad, R., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Chiarini, M., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Nemoz, C., Palmonari, F., Polini, A., Sartorelli, G., Timellini, R., Zamora Garcia, Y., Zichichi, A., Bargende, A., Crittenden, J., Desch, K., Diekmann, B., Doeker, T., Eckert, M., Feld, L., Frey, A., Geerts, M., Geitz, G., Grothe, M., Haas, T., Hartmann, H., Haun, D., Heinloth, K., Hilger, E., Jakob, H. P., Katz, U. F., Mari, S. M., Mass, A., Mengel, S., Mollen, J., Paul, E., Ch Rembser, Schattevoy, R., Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Dyce, N., Foster, B., George, S., Gilmore, R., Heath, G. P., Heath, H. F., Llewellyn, T. J., Morgado, C. J. S., Norman, D. J. P., Mara, J. A. O., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, M., Iannotti, L., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Cartiglia, N., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jeleń, K., Kisielewska, D., Kowalski, T., Rulikowska-Zarȩbska, E., Suszycki, L., Zaja̧c, J., Kotański, A., Przybycień, M., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Coldewey, C., Deppe, O., Desler, K., Drews, G., Flasiński, M., Gilkinson, D. J., Glasman, C., Göttlicher, P., Große-Knetter, J., Gutjahr, B., Hain, W., Hasell, D., Heßling, H., Hultschig, H., Iga, Y., Joos, P., Kasemann, M., Klanner, R., Koch, W., Köpke, L., Kötz, U., Kowalski, H., Labs, J., Ladage, A., Löhr, B., Löwe, M., Lüke, D., Mańczak, O., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Roco, M., Rohde, M., Roldán, J., Schneekloth, U., Schulz, W., Selonke, F., Stiliaris, E., Surrow, B., Voß, T., Westphal, D., Wolf, G., Youngman, C., Zhou, J. F., Grabosch, H. J., Kharchilava, A., Leich, A., Mattingly, M., Meyer, A., Schlenstedt, S., Wulff, N., Barbagli, G., Pelfer, P., Anzivino, G., Maccarrone, G., Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Freidhof, A., Stefan Soldner-Rembold, Schroeder, J., Trefzger, T., Brook, N. H., Bussey, P. J., Doyle, A. T., Fleck, J. I., Saxon, D. H., Utley, M. L., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Hagge, L., Lohrmann, E., Mainusch, J., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Butterworth, I., Gallo, E., Harris, V. L., Hung, B. Y. H., Long, K. R., Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A. F., Mallik, U., Mccliment, E., Wang, M. Z., Wang, S. M., Wu, J. T., Zhang, Y., Cloth, P., Filges, D., An, S. H., Hong, S. M., Nam, S. W., Park, S. K., Suh, M. H., Yon, S. H., Imlay, R., Kartik, S., Kim, H. J., Mcneil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Graciani, R., Hernández, J. M., Hervás, L., Labarga, L., Del Peso, J., Puga, J., Terron, J., Trocóniz, J. F., Smith, G. R., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Patel, P. M., Sinclair, L. E., Stairs, D. G., St Laurent, M., Ullmann, R., Zacek, G., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Y. A., Kobrin, V. D., Kuzmin, V. A., Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Dake, A., Engelen, J., Kamps, M., Kooijman, P., Kruse, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., Wolf, E., Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Honscheid, K., Li, C., Ling, T. Y., Mclean, K. W., Murray, W. N., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, D. S., Blair, G. A., Byrne, A., Cashmore, R. J., Cooper-Sarkar, A. M., Daniels, D., Devenish, R. C. E., Harnew, N., Lancaster, M., Luffman, P. E., Lindemann, L., Mcfall, J. D., Nath, C., Noyes, V. A., Quadt, A., Uijterwaal, H., Walczak, R., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Whitmore, J. J., Agostini, G. D., Marini, G., Nigro, A., Tassi, E., Hart, J. C., Mccubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Dubbs, T., Heusch, C., Hook, M., Hubbard, B., Lockman, W., Rahn, J. T., Sadrozinski, H. F. W., Seiden, A., Biltzinger, J., Seifert, R. J., Walenta, A. H., Zech, G., Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Hasegawa, T., Hazumi, M., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nakamitsu, Y., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Bandyopadhyay, D., Benard, F., Brkic, M., Crombie, M. B., Gingrich, D. M., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Sampson, C. R., Teuscher, R. J., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Kochocki, J., Lu, B., Mo, L. W., Bogusz, W., Charchula, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Eisenberg, Y., Karshon, U., Revel, D., Zer-Zion, D., Ali, I., Badgett, W. F., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Tsurugai, T., Bhadra, S., Cardy, M. L., Fagerstroem, C. P., Frisken, W. R., Furutani, K. M., Khakzad, M., Schmidke, W. B., and Zeus (IHEF, IoP, FNWI)
Subjects: Nuclear and High Energy Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), Proton, parton distributions, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Hadron, dijet production, FOS: Physical sciences, Jet (particle physics), PROTON, 7. Clean energy, 01 natural sciences, Zeus (malware), High Energy Physics - Experiment, EVENTS, Nuclear physics, High Energy Physics - Experiment (hep-ex), MONTE-CARLO, 0103 physical sciences, ZEUS, BARREL CALORIMETER, PARTON DISTRIBUTIONS, HARD SCATTERING, PHOTON, QCD, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Physics, Quantum chromodynamics, Jet (fluid), gluon content, CTEQ PARTON DISTRIBUTIONS, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, ZEUS BARREL CALORIMETER, HERA, CENTRAL TRACKING DETECTOR, HADRON-COLLISIONS, Pseudorapidity, High Energy Physics::Experiment
Abstract: Dijet cross sections are presented using photoproduction data obtained with the ZEUS detector during 1994. These measurements represent an extension of previous results, as the higher statistics allow cross sections to be measured at higher jet transverse energy (ETJ). Jets are identified in the hadronic final state using three different algorithms, and the cross sections compared to complete next-to-leading order QCD calculations. Agreement with these calculations is seen for the pseudorapidity dependence of the direct photon events with ETJ > 6 GeV and of the resolved photon events with ETJ > 11 GeV. Calculated cross sections for resolved photon processes with 6 GeV < ETJ < 11 GeV lie below the data., 30 pages including 5 figures. Includes a reference mistakenly omitted in previous version

17. Comparison of energy flows in deep inelastic scattering events with and without a large rapidity gap

Author: Derrick, Malcolm, Krakauer, D., Magill, Steve, Musgrave, Brian, Repond, Jose, Schlereth, J., Stanek, R., Talaga, R. L., Thron, J., Arzarello, F., Ayed, R., Bari, G., Basile, M., Bellagamba, Lorenzo, Boscherini, Davide, Bruni, Alessia, Bruni, Graziano, Bruni, P., Cara Romeo, G., Castellini, G., Chiarini, M., Cifarelli, L., Cindolo, Federico, Ciralli, F., Contin, A., D'Auria, S., Del Papa, C., Frasconi, F., Giusti, Paolo, Iacobucci, G., Laurenti, G., Levi, Giuseppe, Maccarrone, G., Margotti, A., Massam, T., Nania, Rosario, Nemoz, C., Palmonari, Federico, Polini, Alessandro, Sartorelli, Gabriel, Timellini, R., Zamora Garcia, Y., Zichichi, Antonio, Bargende, A., Crittenden, J., Desch, Klaus, Diekmann, B., Doeker, T., Feld, L., Frey, A., Geerts, M., Geitz, G., Grothe, M., Hartmann, H., Haun, D., Heinloth, K., Hilger, Erwin, Jakob, Hans-Peter, Katz, U. F., Mari, S. M., Mass, A., Mengel, S., Mollen, J., Paul, Ewald, Rembser, C., Schattevoy, R., Schneider, J. L., Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Dyce, N., Foster, Brian, George, S., Gilmore, R., Heath, G. P., Heath, Helen F., Llewellyn, T. J., Morgado, C. J. S., Norman, D. J. P., O'Mara, J. A., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, Michele, Iannotti, L., Schioppa, Marco, Susinno, Giancarlo, Bernstein, A., Caldwell, Allen, Gialas, Ioannis, Parsons, J. A., Ritz, S., Sciulli, Frank, Straub, P. B., Wai, L., Yang, S., Borzemski, P., Chwastowski, Janusz, Eskreys, Andrzej, Piotrzkowski, Krzysztof, Zachara, M., Zawiejski, Leszek, Adamczyk, L., Bednarek, B., Eskreys, K., Jelen, K., Kisielewska, D., Kowalski, Tadeusz, Rulikowska-Zarebska, E., Suszycki, L., Zajac, J., Kedzierski, T., Kotanski, A., Przybycien, M., Bauerdick, L. A. T., Behrens, U., Bienlein, J. K., Bottcher, S., Coldewey, C., Drews, G., Flasinski, M., Gilkinson, D. J., Gottlicher, P., Gutjahr, B., Haas, Tobias, Hagge, L., Hain, W., Hasell, Douglas, Hessling, Hermann, Hultschig, H., Iga, Yoshihisa, Joos, P., Kasemann, M., Klanner, R., Koch, W., Kopke, L., Kotz, U., Kowalski, H., Kroger, W., Kruger, J., Labs, J., Ladage, A., Lohr, B., Lowe, M., Luke, D., Mainusch, J., Manczak, O., Ng, J. S. T., Nickel, S., Notz, Dieter, Ohrenberg, Kars, Roco, M., Rohde, M., Roldan, J., Schneekloth, U., Schroeder, J., Schulz, W., Selonke, F., Stiliaris, E., Voss, T., Westphal, D., Wolf, G., Youngman, C., Grabosch, H. J., Leich, Angelika, Meyer, A., Rethfeldt, C., Schlenstedt, Stefan, Barbagli, Guiseppe, Pelfer, Pier Giovanni, Anzivino, G., De Pasquale, S., Qian, S., Votano, L., Bamberger, Andreas, Freidhof, A., Poser, T., Soldner-Rembold, S., Theisen, G., Trefzger, T., Brook, Nick, Bussey, Peter, Doyle, A. T., Fleck, I., Forbes, J. R., Jamieson, V. A., Raine, C., Saxon, David, Stavrianakou, M., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Kammerlocher, H., Krebs, B., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Furtjes, A., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, Nicolaie, Poelz, G., Schott, W., Terron, Juan, Zetsche, F., Bacon, T. C., Beuselinck, R., Butterworth, I., Gallo, E., Harris, V. L., Hung, B. H. Y., Long, Kenneth, Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A., Mallik, U., McCliment, E., Wang, Min-Zu, zhang, Y., Cloth, P., Filges, D., An, S. H., Hong, S. M., Kim, C. O., Kim, T. Y., Nam, S. W., Park, S. K., Suh, M. H., Yon, S. H., Imlay, R., Kartik, S., Kim, Hyun-Jeong, McNeil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, Fernando, Cases, G., Graciani, R., Hernandez, J. M., Hervas, L., Labarga, Luis, del Peso, J., Puga, J., de Troconiz, J. F., Ikraiam, F., Mayer, J. K., Smith, G. R., Corriveau, Francois, Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C., Mitchell, J. W., Patel, P. M., Sinclair, L. E., Stairs, D. G., St. Laurent, M., Ullmann, R., Bashkirov, V., Dolgoshein, Boris, Stifutkin, A., Bashindzhagian, G. L., Ermolov, P. F., Gladilin, Leonid, Golubkov, Yury, Kobrin, V. D. D., Kuzmin, V. A., Proskuryakov, Alexander, Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Bentvelsen, S., Botje, Michiel, Chlebana, F., Dake, A., Engelen, J., de Jong, P., de Kamps, M., Kooijman, Paul, Kruse, A., O'Dell, V., Tenner, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, Leo, de Wolf, E., van Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Honscheid, K., Li, C., Ling, T. Y., McLean, K. W., Murray, W. N., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, David C., Blair, Graham, Byrne, A., Cashmore, R. J., Cooper-Sarkar, Amanda, Daniels, D., Devenish, Robin, Harnew, N., Lancaster, M., Luffman, P., McFall, J., Nath, C., Quadt, A., Uijterwaal, H., Walczak, Roman, Wilson, F. F., Yip, T., Abbiendi, Giovanni, Bertolin, Alessandro, Brugnera, Riccardo, Carlin, Roberto, Dal Corso, Flavio, De Giorgi, M., Dosselli, Umberto, Gasparini, F., Limentani, Silvia, Morandin, Mauro, Posocco, Mario, Stanco, Luca, Stroili, R., Voci, C., Bulmahn, J., Butterworth, Jonathan, Feild, R. G., Oh, B. Y., Whitmore, J., D'Agostini, G., Guida, M., Iori, M., Marini, Giuseppe, Mattioli, M., Nigro, Andrea, Hart, J. C., McCubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Cartiglia, N., Dubbs, T., Heusch, C., Van Hook, M., Hubbard, B., Lockman, William S., Sadrozinski, H. F., Seiden, A., Biltzinger, J., Seifert, R. J., Walenta, A. H., Zech, Gunter, Abramowicz, Halina, Dagan, S., Levy, Aharon, Hasegawa, T., Hazumi, M., Ishii, T., Kuze, Masahiro, Mine, S., Nagasawa, Y., Nagira, T., Nakao, M., Suzuki, I., Tokushuku, Katsuo, Yamada, Sakue, Yamazaki, Yuji, Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nagayama, S., Nakamitsu, Y., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, Roberto, Solano, Ada, Staiano, A., Dardo, M., Bandyopadhyay, D., Benard, F., Brkic, M., Crombie, M. B., Gingrich, D. M., Hartner, Gerd, Joo, K. K., Levman, G. M., Martin, John F., Orr, R. S., Sampson, Cortney R., Teuscher, R. J., Catterall, Corinna, Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Kochocki, J., Lu, B., Mo, L. W., Bogusz, W., Charchula, K., Ciborowski, Jacek, Gajewski, J., Grzelak, Grzegorz, Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, Teresa, Wroblewski, A. K., Zakrzewski, Janusz Andrzej, Zarnecki, Aleksander Filip, Adamus, M., Eisenberg, Yehuda, Glasman, C., Karshon, U., Revel, D., Shapira, A., Ali, I., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Tsurugai, Tatsumasa, Bhadra, Sampa, Frisken, William R., Furutani, K. M., ZEUS Collaboration, and Zeus (IHEF, IoP, FNWI)
Subjects: electron p [deep inelastic scattering], Parton, event shape analysis, 01 natural sciences, JET FRAGMENTATION, PARTON, deep inelastic scattering: electron p, hadron: multiple production, Nuclear Experiment, colliding beams [electron p], Physics, Quantum chromodynamics, Range (particle radiation), DESY DESY HERA Stor Stor, inelastic scattering, HERA, electron p [colliding beams], large rapidity gap, colliding beams: electron p, electron p: colliding beams, SIMULATION, rapidity dependence [energy flow], LUND MONTE-CARLO, E+E-PHYSICS, QCD, CALORIMETER, ZEUS, DISTRIBUTIONS, MODEL, electron p: deep inelastic scattering, Nuclear and High Energy Physics, Particle physics, gap [rapidity spectrum], 296 GeV-cms, Nuclear physics, 0103 physical sciences, Rapidity, energy flow: rapidity dependence, ddc:530, 010306 general physics, hadron [multiple production], multiple production [hadron], ZEUS (particle detector), 010308 nuclear & particles physics, Scattering, Deep inelastic scattering, multiple production: hadron, rapidity spectrum: gap, deep inelastic scattering [electron p], High Energy Physics::Experiment, experimental results
Abstract: Physics letters / B 338(4), 483-496 (1994). doi:10.1016/0370-2693(94)90804-4, Energy flows in deep inelastic electron-proton scattering are investigated at a centre-of-mass energy of 269 GeV for the range $Q^2 ≥ 10 \text{ GeV}^2$ using the ZEUS detector. A comparison is made between events with and without a large rapidity gap between the hadronic system and the proton direction. The energy flows, corrected for detector acceptance and resolution, are shown for these two classes of events in both the HERA laboratory frame and the Breit frame. From the differences in the shapes of these energy flows we conclude that QCD radiation is suppressed in the large-rapidity-gap eents compared to the events without a large rapidity gap., Published by North-Holland Publ., Amsterdam
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18. Study of the photon remnant in resolved photoproduction at HERA

Author: David Bailey, Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Ayad, R., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Chiarini, M., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Nemoz, C., Palmonari, F., Polini, A., Sartorelli, G., Timellini, R., Zamora Garcia, Y., Zichichi, A., Bargende, A., Crittenden, J., Desch, K., Diekmann, B., Docker, T., Eckert, M., Feld, L., Frey, A., Geerts, M., Geitz, G., Grothe, M., Haas, T., Hartmann, H., Heinloth, K., Hilger, E., Jakob, H. P., Katz, U. F., Mari, S. M., Mass, A., Mengel, S., Mollen, J., Paul, E., Ch Rembser, Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Dyce, N., Foster, B., George, S., Gilmore, R., Heath, G. P., Heath, H. F., Llewellyn, T. J., Morgado, C. J. S., Norman, D. J. P., Mara, J. A. O., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, M., Iannotti, L., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Cartiglia, N., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jeleń, K., Kisielewska, D., Kowalski, T., Rulikowska-Zarȩbska, E., Suszycki, L., Zaja̧c, J., Kotański, A., Przybycień, M., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Coldewey, C., Deppe, O., Desler, K., Drews, G., Flasiński, M., Gilkinson, D. J., Glasman, C., Göttlicher, P., Große-Knetter, J., Gutjahr, B., Hain, W., Hasell, D., Heßling, H., Iga, Y., Joos, P., Kasemann, M., Klanner, R., Koch, W., Köpke, L., Kotz, U., Kowalski, H., Labs, J., Ladage, A., Löhr, B., Löwe, M., Luke, D., Mainusch, J., Mańczak, O., Monteiro, T., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Roco, M., Rohde, M., Roldán, J., Schneekloth, U., Schulz, W., Selonke, F., Stiliaris, E., Surrow, B., Voß, T., Westphal, D., Wolf, G., Youngman, C., Zhou, J. F., Grabosch, H. J., Kharchilava, A., Leich, A., Mattingly, M. C. K., Meyer, A., Schlenstedt, S., Wulff, N., Barbagli, G., Pelfer, P., Anzivino, G., Maccarrone, G., Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Freidhof, A., Stefan Soldner-Rembold, Schroeder, J., Trefzger, T., Brook, N. H., Bussey, P. J., Doyle, A. T., Fleck, J. J., Saxon, D. H., Utley, M. L., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Hagge, L., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Butterworth, I., Gallo, E., Harris, V. L., Hung, B. Y. H., Long, K. R., Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A. F., Mallik, U., Mccliment, E., Wang, M. Z., Wang, S. M., Wu, J. T., Zhang, Y., Cloth, P., Filges, D., An, S. H., Hong, S. M., Nam, S. W., Park, S. K., Suh, M. H., Yon, S. H., Imlay, R., Kartik, S., Kim, H. J., Mcneil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Fernandez, J. P., Graciani, R., Hernández, J. M., Hervás, L., Labarga, L., Martinez, M., Del Peso, J., Puga, J., Terron, J., Trocóniz, J. F., Smith, G. R., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Patel, P. M., Sinclair, L. E., Stairs, D. G., St Laurent, M., Ullmann, R., Zacek, G., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Y. A., Kobrin, V. D., Kuzmin, V. A., Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Dake, A., Engelen, J., Kamps, M., Kooijman, P., Kruse, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., Wolf, E., Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Honscheid, K., Li, C., Ling, T. Y., Mclean, K. W., Murray, W. N., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, D. S., Byrne, A., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Harnew, N., Lancaster, M., Lindemann, L., Mcfall, J. D., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stance, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Whitmore, J. J., Agostini, G. D., Marini, G., Nigro, A., Tassi, E., Hart, J. C., Mccubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Dubbs, T., Heusch, C., Hook, M., Hubbard, B., Lockman, W., Rahn, J. T., Sadrozinski, H. F. W., Seiden, A., Biltzinger, J., Seifert, R. J., Schwarzer, O., Walenta, A. H., Zech, G., Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Hasegawa, T., Hazumi, M., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nakamitsu, Y., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Bandyopadhyay, D., Benard, F., Brkic, M., Crombie, M. B., Gingrich, D. M., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Sampson, C. R., Teuscher, R. J., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Lu, B., Mo, L. W., Bogusz, W., Charchuła, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Eisenberg, Y., Karshon, U., Revel, D., Zer-Zion, D., Ali, I., Badgett, W. F., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Tsurugai, T., Bhadra, S., Cardy, M. L., Fagerstroem, C. P., Frisken, W. R., Furutani, K. M., Khakzad, M., Schmidke, W. B., and Zeus (IHEF, IoP, FNWI)
Subjects: Nuclear and High Energy Physics, Particle physics, Photon, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, high pt jets, photoproduction, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, COLLIDER, High Energy Physics - Experiment (hep-ex), GAMMA-P INTERACTIONS, MONTE-CARLO, DESIGN, 0103 physical sciences, Cluster (physics), 010306 general physics, Nuclear Experiment, Physics, DEEP-INELASTIC-SCATTERING, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), CONSTRUCTION, 010308 nuclear & particles physics, Faculty of Science\Physics, Mean value, ZEUS, ZEUS BARREL CALORIMETER, HERA, PARTON DISTRIBUTIONS, HADRON-COLLISIONS, HARD SCATTERING, Transverse plane, Cathode ray, High Energy Physics::Experiment, Beam (structure)
Abstract: Photoproduction at HERA is studied in $ep$ collisions, with the ZEUS detector, for $\gamma p$ centre-of-mass energies ranging from 130-270 GeV. A sample of events with two high-$p_T$ jets ($p_T > 6$ GeV, $\eta, Comment: 14 pages, latex 4 figures appended as uuencoded file

19. Inclusive charged particle distributions in deep inelastic scattering events at HERA

Author: Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Polini, A., Sartorelli, G., Zamora Garcia, Y., Zichichi, A., Bornheim, A., Crittenden, J., Desch, K., Diekmann, B., Doeker, T., Eckert, M., Feld, L., Frey, A., Geerts, M., Grothe, M., Hartmann, H., Heinloth, K., Heinz, L., Hilger, E., Jakob, H. -P, Katz, U. F., Mengel, S., Mollen, J., Paul, E., Pfeiffer, M., Rembser, Ch, Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Cottingham, W. N., Dyce, N., Foster, B., George, S., Hayes, M. E., Heath, G. P., Heath, H. F., Morgado, C. J. S., O Mara, J. A., Piccioni, D., Roff, D. G., Tapper, R. J., Yoshida, R., Rau, R. R., Arneodo, M., Ayad, R., Capua, M., Garfagnini, A., Iannotti, L., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Cartiglia, N., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jeleń, K., Kisielewska, D., Kowalski, T., Przybycień, M., Rulikowska-Zarçbska, E., Suszycki, L., Zaja̧c, J., Kotański, A., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Coldevvey, C., Deppe, O., Desler, K., Drews, G., Flasiński, M., Gilkinson, D. J., Glasman, C., Göttlicher, P., Große-Knetter, J., Gutjahr, B., Haas, T., Hain, W., Hasell, D., Heßling, H., Iga, Y., Johnson, K. F., Joos, P., Kasemann, M., Klanner, R., Koch, W., Köpke, L., Kötz, U., Kowalski, H., Labs, J., Ladage, A., Löhr, B., Löwe, M., Lüke, D., Mainusch, J., Mańczak, O., Monteiro, T., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Roco, M., Rohde, M., Roldán, J., Schneekloth, U., Schulz, W., Selonke, F., Efstathios Stiliaris, Surrow, B., Voß, T., Westphal, D., Wolf, G., Youngman, C., Zeuner, W., Zhou, J. F., Grabosch, H. J., Kharchilava, A., Leich, A., Mari, S. M., Mattingly, M. C. K., Meyer, A., Schlenstedt, S., Wulff, N., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, G., Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Freidhof, A., Söldner-Rembold, S., Schroeder, J., Trefzger, T., Bromley, J. T., Brook, N. H., Bussey, P. J., Doyle, A. T., Saxon, D. H., Utley, M. L., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Hagge, L., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Bruemmer, N., Butterworth, I., Harris, V. L., Hung, B. Y. H., Long, K. R., Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A. F., Mallik, U., Mccliment, E., Wang, M. Z., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., An, S. H., Cho, G. H., Ko, B. J., Lee, S. B., Nam, S. W., Park, H. S., Park, S. K., Imlay, R., Kartik, S., Kim, H. -J, Mcneil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Fernandez, J. P., Graciani, R., Hernández, J. M., Hervás, L., Labarga, L., Martinez, M., Del Peso, J., Puga, J., Terron, J., Trocóniz, J. F., Smith, G. R., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Patel, P. M., Sinclair, L. E., Stairs, D. G., St Laurent, M., Ullmann, R., Zacek, G., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Yu A., Kobrin, V. D., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Yu, Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Dake, A., Engelen, J., Kamps, M., Kooijman, P., Kruse, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., Wolf, E., Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Honscheid, K., Li, C., Ling, T. Y., Mclean, K. W., Nylander, P., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, D. S., Byrne, A., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Harnew, N., Lancaster, M., Lindemann, L., Mcfall, J. D., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Okrasinski, J. R., Whitmore, J. J., D Agostini, G., Marini, G., Nigro, A., Tassi, E., Hart, J. C., Mccubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Dubbs, T., Heusch, C., Hook, M., Lockman, W., Rahn, J. T., Sadrozinski, H. F. -W, Seiden, A., Williams, D. C., Biltzinger, J., Seifert, R. J., Schwarzer, O., Walenta, A. H., Zech, G., Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Fleck, J. I., Hasegawa, T., Hazumi, M., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nakamitsu, Y., Yamauchi, K., Cirio, R., Costa, M., Ferrera, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Benard, F., Brkic, M., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sampson, C. R., Teuscher, R. J., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Lu, B., Mo, L. W., Bogusz, W., Charchuła, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Eisenberg, Y., Karshon, U., Revel, D., Zer-Zion, D., Ali, I., Badgett, W. F., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Tsurugai, T., Bhadra, S., Cardy, M. L., Fagerstroem, C. -P, Frisken, W. R., Khakzad, M., Murray, W. N., Schmidke, W. B., and ZEUS at HERA (IHEF, IoP, FNWI)
Subjects: Particle physics, Physics and Astronomy (miscellaneous), LUND MONTE-CARLO, FOS: Physical sciences, Parton, 01 natural sciences, JET FRAGMENTATION, High Energy Physics - Experiment, Nuclear physics, MUON-PROTON-SCATTERING, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, ZEUS, SIMULTANEOUS PATTERN-RECOGNITION, ZEUS BARREL CALORIMETER, KALMAN FILTERING METHOD, DIFFRACTION DISSOCIATION, TRANSVERSE-MOMENTUM, E+E-PHYSICS, HADRONS, 010306 general physics, Nuclear Experiment, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, Momentum transfer, High Energy Physics::Phenomenology, Perturbative QCD, HERA, Deep inelastic scattering, Charged particle, Baryon, High Energy Physics::Experiment
Abstract: A measurement of inclusive charged particle distributions in deep inelastic $ep$ scattering for $\gamma^* p$ centre-of-mass energies $75< W < 175$~GeV and momentum transfer squared $10< Q^2 < 160$~GeV$^2$ from the ZEUS detector at HERA is presented. The differential charged particle rates in the $\gamma^* p$ centre-of-mass system as a function of the scaled longitudinal momentum, $x_F$, and of the transverse momentum, $p_t^*$ and $\,\,$ , as a function of $x_F$, $W$ and $Q^2$ are given. Separate distributions are shown for events with (LRG) and without (NRG) a rapidity gap with respect to the proton direction. The data are compared with results from experiments at lower beam energies, with the naive quark parton model and with parton models including perturbative QCD corrections. The comparison shows the importance of the higher order QCD processes. Significant differences of the inclusive charged particle rates between NRG and LRG events at the same $W$ are observed. The value of $\,\,$ for LRG events with a hadronic mass $M_X$, which excludes the forward produced baryonic system, is similar to the $\,\,$ value observed in fixed target experiments at $W \approx M_X$., Comment: 34 pages, latex, 9 figures appended as uuencoded file. Author list corrected

20. Measurement of inclusive D*± and associated dijet cross sections in photoproduction at HERA

Author: Breitweg, J., Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Yoshida, R., Zhang, H., Mattingly, M. C. K., Anselmo, F., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Cara Romeo, G., Castellini, G., Cifarelli, L., Cindolo, F., Contin, A., Coppola, N., Corradi, M., Pasquale, S., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Pesci, A., Polini, A., Sartorelli, G., Zamora Garcia, Y., Zichichi, A., Amelung, C., Bornheim, A., Brock, I., Coböken, K., Crittenden, J., Deffner, R., Eckert, M., Grothe, M., Hartmann, H., Heinloth, K., Heinz, L., Hilger, E., Jakob, H. -P, Kappes, A., Katz, U. F., Kerger, R., Paul, E., Pfeiffer, M., Schnurbusch, H., Wieber, H., Bailey, D. S., Campbell-Robson, S., Cottingham, W. N., Foster, B., Hall-Wilton, R., Heath, G. P., Heath, H. F., Mcfall, J. D., Piccioni, D., Roff, D. G., Tapper, R. J., Capua, M., Iannotti, L., Mastroberardino, A., Schioppa, M., Susinno, G., Kim, J. Y., Lee, J. H., Lim, I. T., Pac, M. Y., Caldwell, A., Cartiglia, N., Jing, Z., Liu, W., Mellado, B., Parsons, J. A., Ritz, S., Sampson, S., Sciulli, F., Straub, P. B., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Jan Figiel, Klimek, K., Przybycień, M. B., Zawiejski, L., Adamczyk, L., Bednarek, B., Bukowy, M., Czermak, A. M., Jeleń, K., Kisielewska, D., Kowalski, T., Przybycień, M., Rulikowska-Zarebska, E., Suszycki, L., Zajac, J., Duliński, Z., Kotański, A., Abbiendi, G., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Desler, K., Drews, G., Fricke, U., Gialas, I., Goebel, F., Göttlicher, P., Graciani, R., Haas, T., Hain, W., Hartner, G. F., Hasell, D., Hebbel, K., Johnson, K. F., Kasemann, M., Koch, W., Kötz, U., Kowalski, H., Lindemann, L., Löhr, B., Martínez, M., Milewski, J., Milite, M., Monteiro, T., Notz, D., Pellegrino, A., Pelucchi, F., Piotrzkowski, K., Rohde, M., Roldán, J., Ryan, J. J., Saull, P. R. B., Savin, A. A., Schneekloth, U., Schwarzer, O., Selonke, F., Stonjek, S., Surrow, B., Tassi, E., Westphal, D., Wolf, G., Wollmer, U., Youngman, C., Zeuner, W., Burow, A. D., Coldewey, C., Grabosch, H. J., Meyer, A., Schlenstedt, S., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, E., Votano, L., Bamberger, A., Eisenhardt, S., Markun, P., Raach, H., Trefzger, T., Wölfle, S., Bromley, J. T., Brook, N. H., Bussey, P. J., Doyle, A. T., Lee, S. W., Macdonald, N., Mccance, G. J., Saxon, D. H., Sinclair, L. E., Skillicorn, I. O., Strickland, E., Waugh, R., Bohnet, I., Gendner, N., Holm, U., Meyer-Larsen, A., Salehi, H., Wick, K., Garfagnini, A., Gladilin, L. K., Kçira, D., Klanner, R., Lohrmann, E., Poelz, G., Zetsche, F., Bacon, T. C., Butterworth, I., Cole, J. E., Howell, G., Lamberti, L., Long, K. R., Miller, D. B., Pavel, N., Prinias, A., Sedgbeer, J. K., Sideris, D., Walker, R., Mallik, U., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., Fleck, J. I., Ishii, T., Kuze, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamauchi, K., Yamazaki, Y., Hong, S. J., Lee, S. B., Nam, S. W., Park, S. K., Lim, F., Park, I. H., Son, D., Barreiro, F., Fernández, J. P., García, G., Glasman, C., Hernández, J. M., Hervás, L., Labarga, L., Del Peso, J., Puga, J., Terrón, J., Trocóniz, J. F., Corriveau, F., Hanna, D. S., Hartmann, J., Murray, W. N., Ochs, A., Riveline, M., Stairs, D. G., St-Laurent, M., Tsurugai, T., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, H. L., Ermolov, P. F., Golubkov, Y. A., Khein, L. A., Korotkova, N. A., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Y., Proskuryakov, A. S., Shcheglova, L. M., Solomin, A. N., Zotkin, S. A., Bokel, C., Botje, M., Brümmer, N., Engelen, J., Koffeman, E., Kooijman, P., Sighem, A., Tiecke, H., Tuning, N., Verkerke, W., Vossebeld, J., Wiggers, L., Wolf, E., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Ginsburg, C. M., Kim, C. L., Ling, T. Y., Nylander, P., Romanowski, T. A., Blaikley, H. E., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Edmonds, J. K., Große-Knetter, J., Harnew, N., Nath, C., Noyes, V. A., Quadt, A., Ruske, O., Tickner, J. R., Walczak, R., Waters, D. S., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Oh, B. Y., Okrasiński, J. R., Toothacker, W. S., Whitmore, J. J., Iga, Y., D Agostini, G., Marini, G., Nigro, A., Raso, M., Hart, J. C., Mccubbin, N. A., Shah, T. P., Epperson, D., Heusch, C., Rahn, J. T., Sadrozinski, H. F. -W, Seiden, A., Wichmann, R., Williams, D. C., Abramowicz, H., Briskin, G., Dagan, S., Kananov, S., Levy, A., Abe, T., Fusayasu, T., Inuzuka, M., Nagano, K., Umemori, K., Yamashita, T., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Matsushita, T., Nishimura, T., Arneodo, M., Cirio, R., Costa, M., Ferrero, M. I., Maselli, S., Monaco, V., Peroni, C., Petrucci, M. C., Ruspa, M., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Fagerstroem, C. -P, Galea, R., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sabetfakhri, A., Simmons, D., Butterworth, J. M., Catterall, C. D., Hayes, M. E., Heaphy, E. A., Jones, T. W., Lane, J. B., Saunders, R. L., Sutton, M. R., Wing, M., Ciborowski, J., Grzelak, G., Nowak, R. J., Pawlak, J. M., Pawlak, R., Smalska, B., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Deppe, O., Eisenberg, Y., Hochman, D., Karshon, U., Badgett, W. F., Chapin, D., Cross, R., Dasu, S., Foudas, C., Loveless, R. J., Mattingly, S., Reeder, D. D., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Deshpande, A., Dhawan, S., Hughes, V. W., Bhadra, S., Frisken, W. R., Khakzad, M., and Schmidke, W. B.
Subjects: Particle physics, HEAVY FLAVOR PRODUCTION, E+E ANNIHILATION, Physics and Astronomy (miscellaneous), Meson, FRAGMENTATION FUNCTIONS, FOS: Physical sciences, Parton, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), ZEUS, CENTRAL TRACKING DETECTOR, ZEUS BARREL CALORIMETER, HADRON-COLLISIONS, EP-COLLISIONS, PARTON DISTRIBUTIONS, PHOTON, CONSTRUCTION, 0103 physical sciences, Charm (quantum number), 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, Quantum chromodynamics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Perturbative QCD, HERA, Pseudorapidity, Production (computer science), High Energy Physics::Experiment
Abstract: Inclusive photoproduction of D*+- mesons has been measured for photon-proton centre-of-mass energies in the range 130 < W < 280 GeV and a photon virtuality Q^2 < 1 GeV^2. The data sample used corresponds to an integrated luminosity of 37 pb^-1. Total and differential cross sections as functions of the D* transverse momentum and pseudorapidity are presented in restricted kinematical regions and the data are compared with next-to-leading order (NLO) perturbative QCD calculations using the "massive charm" and "massless charm" schemes. The measured cross sections are generally above the NLO calculations, in particular in the forward (proton) direction. The large data sample also allows the study of dijet production associated with charm. A significant resolved as well as a direct photon component contribute to the cross section. Leading order QCD Monte Carlo calculations indicate that the resolved contribution arises from a significant charm component in the photon. A massive charm NLO parton level calculation yields lower cross sections compared to the measured results in a kinematic region where the resolved photon contribution is significant., 32 pages including 6 figures

21. Search for lepton flavor violation in ep collisions at 300 GeV center of mass energy

Author: Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Okrasiński, J. R., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Mattingly, M. C. K., Anselmo, F., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Pesci, A., Polini, A., Sartorelli, G., Zamora Garcia, Y., Zichichi, A., Amelung, C., Bornheim, A., Crittenden, J., Deffner, R., Eckert, M., Feld, L., Frey, A., Geerts, M., Grothe, M., Hartmann, H., Heinloth, K., Heinz, L., Hilger, E., Jakob, H. -P, Katz, U. F., Mengel, S., Paul, E., Pfeiffer, M., Rembser, Ch, Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Cottingham, W. N., Dyce, N., Foster, B., George, S., Hayes, M. E., Heath, G. P., Heath, H. F., Piccioni, D., Roff, D. G., Tapper, R. J., Yoshida, R., Arneodo, M., Ayad, R., Capua, M., Garfagnini, A., Iannotti, L., Schioppa, M., Susinno, G., Caldwell, A., Cartiglia, N., Jing, Z., Liu, W., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Jakubowski, Z., Przybycień, M. B., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jeleń, K., Kisielewska, D., Kowalski, T., Przybycień, M., Rulikowska-Zarȩbska, E., Suszycki, L., Zaja̧c, J., Duliński, Z., Kotański, A., Abbiendi, G., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Cases, G., Deppe, O., Desler, K., Drews, G., Flasiński, M., Gilkinson, D. J., Glasman, C., Göttlicher, P., Große-Knetter, J., Haas, T., Hain, W., Hasell, D., Heßling, H., Iga, Y., Johnson, K. F., Joos, P., Kasemann, M., Klanner, R., Koch, W., Kötz, U., Kowalski, H., Labs, J., Ladage, A., Löhr, B., Löwe, M., Lüke, D., Mainusch, J., Mańczak, O., Milewski, J., Monteiro, T., Ng, J. S. T., Notz, D., Ohrenberg, K., Piotrzkowski, K., Roco, M., Rohde, M., Roldań, J., Schneekloth, U., Schulz, W., Selonke, F., Surrow, B., Tassi, E., Voß, T., Westphal, D., Wolf, G., Wollmer, U., Youngman, C., Zeuner, W., Grabosch, H. J., Mari, S. M., Meyer, A., Schlenstedt, S., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, G., Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Trefzger, T., Wölfle, S., Bromley, J. T., Brook, N. H., Bussey, P. J., Doyle, A. T., Saxon, D. H., Sinclair, L. E., Strickland, E., Utley, M. L., Waugh, R., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Sinkus, R., Wick, K., Burow, B. D., Hagge, L., Lohrmann, E., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Brümmer, N., Butterworth, I., Harris, V. L., Howell, G., Hung, B. H. Y., Lamberti, L., Long, K. R., Miller, D. B., Pavel, N., Prinias, A., Sedgbeer, J. K., Sideris, D., Whitfield, A. F., Mallik, U., Wang, M. Z., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., An, S. H., Cho, G. H., Ko, B. J., Lee, S. B., Nam, S. W., Park, H. S., Park, S. K., Kartik, S., Kim, H. -J, Mcneil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Fernandez, J. P., Graciani, R., Hernández, J. M., Hervás, L., Labarga, L., Martinez, M., Del Peso, J., Puga, J., Terron, J., Trocóniz, J. F., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Murray, W. N., Ochs, A., Patel, P. M., Riveline, M., Stairs, D. G., St-Laurent, M., Ullmann, R., Zacek, G., Tsurugai, T., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagyan, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Yu A., Kobrin, V. D., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Yu, Proskuryakov, A. S., Savin, A. A., Lydia Shcheglova, Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Engelen, J., Kamps, M., Kooijman, P., Kruse, A., Sighem, A., Tiecke, H., Verkerke, W., Vossebeld, J., Vreeswijk, M., Wiggers, L., Wolf, E., Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Ginsburg, C. M., Kim, C. L., Li, C., Ling, T. Y., Nylander, P., Park, I. H., Romanowski, T. A., Bailey, D. S., Cashmore, R. J., Cooper-Sarkar, A. M., Devenish, R. C. E., Harnew, N., Lancaster, M., Lindemann, L., Mcfall, J. D., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Wilson, F. F., Yip, T., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Zuin, F., Bulmahn, J., Feild, R. G., Oh, B. Y., Whitmore, J. J., D Agostini, G., Marini, G., Nigro, A., Hart, J. C., Mccubbin, N. A., Shah, T. P., Barberis, E., Dubbs, T., Heusch, C., Hook, M., Lockman, W., Rahn, J. T., Sadrozinski, H. F. -W, Seiden, A., Williams, D. C., Biltzinger, J., Seifert, R. J., Schwarzer, O., Walenta, A. H., Abramowicz, H., Briskin, G., Dagan, S., Doeker, T., Levy, A., Fleck, J. I., Inuzuka, M., Ishii, T., Kuze, M., Mine, S., Nakao, M., Suzuki, I., Tokushuku, K., Umemori, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Matsushita, T., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, D. C., Benard, F., Brkic, M., Fagerstroem, C. -P, Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sampson, C. R., Simmons, D., Teuscher, R. J., Butterworth, J. M., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Sutton, M. R., Lu, B., Mo, L. W., Bogusz, W., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wróblewski, A. K., Zakrzewski, J. A., Zarnecki, A. F., Adamus, M., Coldewey, C., Eisenberg, Y., Hochman, D., Karshon, U., Revel, D., Zer-Zion, D., Badgett, W. F., Breitweg, J., Chapin, D., Cross, R., Dasu, S., Foudas, C., Loveless, R. J., Mattingly, S., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Bhadra, S., Cardy, M. L., Frisken, W. R., Khakzad, M., Schmidke, W. B., and Zeus (IHEF, IoP, FNWI)
Subjects: Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, P(P)OVER-BAR COLLISIONS, FOS: Physical sciences, 01 natural sciences, Zeus (malware), High Energy Physics - Experiment, Physics, Particles & Fields, law.invention, ZEUS, CENTRAL TRACKING DETECTOR, ZEUS BARREL CALORIMETER, PARTON DISTRIBUTIONS, SCALAR LEPTOQUARKS, MONTE-CARLO, Z0 DECAYS, CONVERSION, High Energy Physics - Experiment (hep-ex), DESIGN, law, 0103 physical sciences, Leptoquark, 010306 general physics, Collider, Nuclear Experiment, Flavor, Physics, Coupling, Science & Technology, CONSTRUCTION, hep-ex, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, HERA, Nuclear & Particles Physics, 3. Good health, Physical Sciences, High Energy Physics::Experiment, Center of mass, Lepton
Abstract: Using the ZEUS detector at the HERA electron-proton collider, we have searched for lepton flavor violation in ep collisions at a center-of-mass energy s^1/2 of 300 GeV. Events of the type e + p -> lepton + X with a final-state lepton (mu or tau) of high transverse momentum, were sought. No evidence was found for lepton flavor violation in the combined 1993 and 1994 data samples, for which the integrated luminosities were 0.84 pb^-1 for e- p collisions and 2.94 pb^-1 for e+ p collisions. Limits on coupling vs. mass are provided for leptoquarks and R-parity violating squarks. For flavor violating couplings of electromagnetic strength, we set 95% confidence level lower limits on leptoquark masses between 207 GeV and 272 GeV, depending on the leptoquark species and final-state lepton. For leptoquark masses larger than 300 GeV, limits on flavor-changing couplings are determined, many of which supersede prior limits from rare decay processes., 37 pages, 9 figures, LaTex

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21 results on '"Bienlein, J K"'

1. Measurement of azimuthal asymmetries in deep inelastic scattering

2. Measurement of high-$Q^2$ charged-current $e^+p$ deep inelastic scattering cross sections at HERA

3. Observation of jet production in deep inelastic scattering with a large rapidity gap at HERA

4. Measurement of inclusive prompt photon photoproduction at HERA

5. Measurement of the proton structure function F-2 at very low Q(2) at HERA

6. The Q(2) dependence of dijet cross sections in gamma p interactions at HERA

7. Measurement of the E(T,jet)^2/Q^2 dependence of forward-jet production at HERA

8. Search for selectron and squark production in e(+)p collisions at HERA

9. Measurement of inelastic J/psi photoproduction at HERA

10. Study of photon dissociation in diffractive photoproduction at HERA

11. Measurement of Elastic omega Photoproduction at HERA

12. Observation of events with an energetic forward neutron in deep inelastic scattering at HERA

13. MEASUREMENT OF ELASTIC P(0) PHOTOPRODUCTION AT HERA

14. Diffractive Hard Photoproduction at HERA and Evidence for the Gluon Content of the Pomeron

15. Observation of Direct Processes In Photoproduction At Hera

16. Dijet cross sections in photoproduction at HERA

17. Comparison of energy flows in deep inelastic scattering events with and without a large rapidity gap

18. Study of the photon remnant in resolved photoproduction at HERA

19. Inclusive charged particle distributions in deep inelastic scattering events at HERA

20. Measurement of inclusive D*± and associated dijet cross sections in photoproduction at HERA

21. Search for lepton flavor violation in ep collisions at 300 GeV center of mass energy

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21 results on '"Bienlein, J K"'

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