Diffractive dijet photoproduction in ep collisions at HERA
- Aaron, F. D.
- Alexa, C.
- Andreev, V.
- Backovic, S.
- Baghdasaryan, A.
- Barrelet, E.
- Bartel, W.
- Begzsuren, K.
- Belousov, A.
- Bizot, J. C.
- Boudry, V.
- Bozovic-Jelisavcic, I.
- Bracinik, J.
- Brandt, G.
- Brinkmann, M.
- Brisson, V.
- Bruncko, D.
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- Buschhorn, G.
- Bystritskaya, L.
- Campbell, A. J.
- Cantun Avila, K. B.
- Cerny, K.
- Cerny, V.
- Chekelian, V.
- Cholewa, A.
- Contreras, J. G.
- Coughlan, J. A.
- Cvach, J.
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- Daum, K.
- Deak, M.
- Delcourt, B.
- Delvax, J.
- De Wolf, E. A.
- Diaconu, C.
- Dobre, M.
- Dodonov, V.
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- Dubak, A.
- Eckerlin, G.
- Efremenko, V.
- Egli, S.
- Eliseev, A.
- Elsen, E.
- Falkiewicz, A.
- Favart, L.
- Fedotov, A.
- Felst, R.
- Feltesse, J.
- Ferencei, J.
- Fischer, D. -J.
- Fleischer, M.
- Fomenko, A.
- Gabathuler, E.
- Gayler, J.
- Ghazaryan, S.
- Glazov, A.
- Goerlich, L.
- Gogitidze, N.
- Gouzevitch, M.
- Grab, C.
- Grebenyuk, A.
- Greenshaw, T.
- Grell, B. R.
- Grindhammer, G.
- Habib, S.
- Haidt, D.
- Helebrant, C.
- Henderson, R. C. W.
- Hennekemper, E.
- Henschel, H.
- Herbst, M.
- Herrera, G.
- Hildebrandt, M.
- Hiller, K. H.
- Hoffmann, D.
- Horisberger, R.
- Hreus, T.
- Huber, F.
- Jacquet, M.
- Janssen, X.
- Jönsson, Leif
- Jung, A. W.
- Jung, H.
- Kapichine, M.
- Katzy, J.
- Kenyon, I. R.
- Kiesling, C.
- Klein, M.
- Kleinwort, C.
- Kluge, T.
- Knutsson, A.
- Kogler, R.
- Kostka, P.
- Kraemer, M.
- Kretzschmar, J.
- Kropivnitskaya, A.
- Krueger, K.
- Kutak, K.
- Landon, M. P. J.
- Lange, W.
- Lastovicka-Medin, G.
- Laycock, P.
- Lebedev, A.
- Lendermann, V.
- Levonian, S.
- Lipka, K.
- List, B.
- List, J.
- Loktionova, N.
- Lopez-Fernandez, R.
- Lubimov, V.
- Makankine, A.
- Malinovski, E.
- Marage, P.
- Marti, Ll.
- Martyn, H. -U.
- Maxfield, S. J.
- Mehta, A.
- Meyer, A. B.
- Meyer, H.
- Meyer, J.
- Mikocki, S.
- Milcewicz-Mika, I.
- Moreau, F.
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- Morris, J. V.
- Mozer, M. U.
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- Papadopoulou, Th.
- Pascaud, C.
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- Perez, E.
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- Pirumov, H.
- Pitzl, D.
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- Pokorny, B.
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- Ravdandorj, T.
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- Robmann, P.
- Roosen, R.
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- Rotaru, M.
- Ruiz Tabasco, J. E.
- Rusakov, S.
- Salek, D.
- Sankey, D. P. C.
- Sauter, M.
- Sauvan, E.
- Schmitt, S.
- Schoeffel, L.
- Schoening, A.
- Schultz-Coulon, H. -C.
- Sefkow, F.
- Shaw-West, R. N.
- Shtarkov, L. N.
- Shushkevich, S.
- Sloan, T.
- Smiljanic, I.
- Soloviev, Y.
- Sopicki, P.
- South, D.
- Spaskov, V.
- Specka, A.
- Staykova, Z.
- Steder, M.
- Stella, B.
- Stoicea, G.
- Straumann, U.
- Sunar, D.
- Sykora, T.
- Thompson, G.
- Thompson, P. D.
- Toll, T.
- Tran, T. H.
- Traynor, D.
- Truoel, P.
- Tsakov, I.
- Tseepeldorj, B.
- Turnau, J.
- Urban, K.
- Valkarova, A.
- Vallee, C.
- Van Mechelen, P.
- Trevino, A. Vargas
- Vazdik, Y.
- von den Driesch, M.
- Wegener, D.
- Wuensch, E.
- Zacek, J.
- Zalesak, J.
- Zhang, Z.
- Zhokin, A.
- Zohrabyan, H.
- Zomer, F.
DOIAbstract
Measurements are presented of single and double-differential dijet cross sections in diffractive photoproduction based on a data sample with an integrated luminosity of 47 pb(-1). The events are of the type ep -> eXY, where the hadronic system X contains at least two jets and is separated by a large rapidity gap from the system Y, which consists of a leading proton or low-mass proton excitation. The dijet cross sections are compared with QCD calculations at next-to-leading order and with a Monte Carlo model based on leading order matrix elements with parton showers. The measured cross sections are smaller than those obtained from the next-to-leading order calculations by a factor of about 0.6. This suppression factor has no significant depe...
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