The dependence of dijet production on photon virtuality in ep collisions at HERA

Chekanov, S. et al. (2004) The dependence of dijet production on photon virtuality in ep collisions at HERA. European Physical Journal C, 35(4), pp. 487-500. (doi: 10.1140/epjc/s2004-01885-2)

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Abstract

The dependence of dijet production on the virtuality of the exchanged photon, Q(2), has been studied by measuring dijet cross sections in the range 0 less than or similar to Q(2) lt 2000 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb(-1). Dijet cross sections were measured for jets with transverse energy E-T(jet) gt 7.5 and 6.5 GeV and pseudorapidities in the photon-proton centre-of-mass frame in the range -3 lt eta(jet) lt 0. The variable x(gamma)(obs), a measure of the photon momentum entering the hard process, was used to enhance the sensitivity of the measurement to the photon structure. The Q(2) dependence of the ratio of low- to high-x(gamma)(obs) events was measured. Next-to-leading-order QCD predictions were found to generally underestimate the low- x(gamma)(obs) contribution relative to that at high x(gamma)(obs). Monte Carlo models based on leading-logarithmic parton-showers, using a partonic structure for the photon which falls smoothly with increasing Q(2), provide a qualitative description of the data.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Skillicorn, Professor Ian and Ferrando, Dr James and Doyle, Professor Anthony and Saxon, Professor David and Bussey, Dr Peter
Authors: Chekanov, S., Derrick, M., Loizides, J.H., Magill, S., Miglioranzi, S., Musgrave, B., Repond, J., Yoshida, R., Mattingly, M.C.K., Pavel, N., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Romeo, G.C., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., De Pasquale, S., Giusti, P., Iacobucci, G., Margotti, A., Montanari, A., Nania, R., Palmonari, F., Pesci, A., Rinaldi, L., Sartorelli, G., Zichichi, A., Aghuzumtsyan, G., Bartsch, D., Brock, I., Goers, S., Hartmann, H., Hilger, E., Irrgang, P., Jakob, H.P., Kind, O., Meyer, U., Paul, E., Rautenberg, J., Renner, R., Stifutkin, A., Tandler, J., Voss, K.C., Wang, M., Bailey, D.S., Brook, N.H., Cole, J.E., Heath, G.P., Namsoo, T., Robins, S., Wing, M., Capua, M., Mastroberardino, A., Schioppa, M., Susinno, G., Kim, J.Y., Lim, I.T., Ma, K.J., Pac, M.Y., Helbich, M., Ning, Y., Ren, Z., Schmidke, W.B., Sciulli, F., Chwastowski, J., Eskreys, A., Figiel, J., Galas, A., Olkiewicz, K., Stopa, P., Zawiejski, L., Adamczyk, L., Bold, T., Grabowska-Bold, I., Kisielewska, D., Kowal, A.M., Kowal, M., Lukasik, J., Przybycien, M., Suszycki, L., Szuba, D., Szuba, J., Kotanski, A., Slominski, W., Adler, V., Behrens, U., Bloch, I., Borras, K., Chiochia, V., Dannheim, D., Drews, G., Fourletova, J., Fricke, U., Geiser, A., Gottlicher, P., Gutsche, O., Haas, T., Hain, W., Hillert, S., Horn, C., Kahle, B., Kotz, U., Kowalski, H., Kramberger, G., Labes, H., Lelas, D., Lim, H., Lohr, B., Mankel, R., Melzer-Pellmann, I.A., Nguyen, C.N., Notz, D., Nuncio-Quiroz, A.E., Polini, A., Raval, A., Rurua, L., Schneekloth, U., Stosslein, U., Wolf, G., Youngman, C., Zeuner, W., Schlenstedt, S., Barbagli, G., Gallo, E., Genta, C., Pelfer, P.G., Bamberger, A., Benen, A., Karstens, F., Dobur, D., Vlasov, N., Bell, M., Bussey, P.J., Doyle, A.T., Ferrando, J., Hamilton, J., Hanlon, S., Lupi, A., Saxon, D.H., Skillicorn, I.O., Gialas, I., Carli, T., Gosau, T., Holm, U., Krumnack, N., Lohrmann, E., Milite, M., Salehi, H., Schleper, P., Schorner-Sadenius, T., Stonjek, S., Wichmann, K., Wick, K., Ziegler, A., Ziegler, A., Collins-Tooth, C., Foudas, C., Goncalo, R., Long, K.R., Tapper, A.D., Cloth, P., Filges, D., Kataoka, M., Nagano, K., Tokushuku, K., Yamada, S., Yamazaki, Y., Barakbaev, A.N., Boos, E.G., Pokrovskiy, N.S., Zhautykov, O., Son, D., Piotrzkowski, K., Barreiro, F., Glasman, C., Gonzalez, O., Labarga, L., del Peso, J., Tassi, E., Terron, J., Zambrana, M., Barbi, M., Corriveau, F., Gliga, S., Lainesse, J., Padhi, S., Stairs, D.G., Walsh, R., Tsurugai, T., Antonov, A., Danilov, P., Dolgoshein, B.A., Gladkov, D., Sosnovtsev, V., Suchkov, S., Dementiev, R.K., Ermolov, P.F., Katkov, I.I., Khein, L.A., Korzhavina, I.A., Kuzmin, V.A., Levchenko, B.B., Lukina, O.Y., Proskuryakov, A.S., Shcheglova, L.M., Zotkin, S.A., Abt, I., Buttner, C., Caldwell, A., Liu, X., Sutiak, J., Coppola, N., Grijpink, S., Koffeman, E., Kooijman, P., Maddox, E., Pellegrino, A., Schagen, S., Tiecke, H., Vazquez, M., Wiggers, L., de Wolf, E., Brummer, N., Bylsma, B., Durkin, L.S., Ling, T.Y., Cooper-Sarkar, A.M., Cottrell, A., Devenish, R.C.E., Foster, B., Grzelak, G., Gwenlan, C., Kohno, T., Patel, S., Straub, P.B., Walczak, R., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., Dusini, S., Garfagnini, A., Limentani, S., Longhin, A., Parenti, A., Posocco, M., Stanco, L., Turcato, M., and Heaphy, E.A.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal C
Publisher:Springer
ISSN:1434-6044
ISSN (Online):1434-6052

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