Studies of the diffractive photoproduction of isolated photons at HERA

H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, S. Antonelli, V. Aushev, Y. Aushev, O. Behnke, U. Behrens, A. Bertolin, I. Bloch, I. Brock, N. H. Brook, R. Brugnera, A. Bruni, P. J. Bussey, A. Caldwell, M. Capua, C. D. Catterall, J. ChwastowskiJ. Ciborowski, R. Ciesielski, A. M. Cooper-Sarkar, M. Corradi, R. K. Dementiev, R. C.E. Devenish, S. Dusini, B. Foster, G. Gach, E. Gallo, A. Garfagnini, A. Geiser, A. Gizhko, L. K. Gladilin, Yu A. Golubkov, G. Grzelak, M. Guzik, C. Gwenlan, O. Hlushchenko, D. Hochman, R. Hori, Z. A. Ibrahim, Y. Iga, M. Ishitsuka, N. Z. Jomhari, I. Kadenko, S. Kananov, U. Karshon, P. Kaur, D. Kisielewska, R. Klanner, U. Klein, I. A. Korzhavina, A. Kotański, N. Kovalchuk, H. Kowalski, B. Krupa, O. Kuprash, M. Kuze, B. B. Levchenko, A. Levy, M. Lisovyi, E. Lobodzinska, B. Löhr, E. Lohrmann, A. Longhin, O. Yu Lukina, J. Malka, A. Mastroberardino, F. Mohamad Idris, N. Mohammad Nasir, V. Myronenko, K. Nagano, Yu Onishchuk, E. Paul, W. Perlański, N. S. Pokrovskiy, A. Polini, M. Przybycień, M. Ruspa, D. H. Saxon, M. Schioppa, U. Schneekloth, T. Schörner-Sadenius, L. M. Shcheglova, O. Shkola, Yu Shyrma, I. O. Skillicorn, W. Slomiński, A. Solano, L. Stanco, N. Stefaniuk, A. Stern, P. Stopa, J. Sztuk-Dambietz, E. Tassi, K. Tokushuku, J. Tomaszewska, T. Tsurugai, M. Turcato, O. Turkot, T. Tymieniecka, A. Verbytskyi, W. A.T. Wan Abdullah, K. Wichmann, M. Wing, S. Yamada, Y. Yamazaki, A. F. Zarnecki, L. Zawiejski, O. Zenaiev, B. O. Zhautykov

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Abstract

The photoproduction of isolated photons has been measured in diffractive events recorded by the ZEUS detector at HERA. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 5 < ETγ < 15 GeV and -0.7 < ηγ < 0.9, inclusively, and also with a jet with transverse energy and pseudorapidity in the ranges 4 < ETjet < 35 GeV and -1.5 < ηjet < 1.8, using a total integrated electronproton luminosity of 456 pb-1. A number of kinematic variables were studied and compared to predictions from the RAPGAP Monte Carlo model. An excess of data is observed above the RAPGAP predictions for z meas > 0.9, where z meas is the fraction of the longitudinal momentum of the colorless "Pomeron" exchange that is transferred to the photon-jet final state, giving evidence for direct Pomeron interactions.

Original languageEnglish
Article number032006
JournalPhysical Review D
Volume96
Issue number3
DOIs
StatePublished - 1 Aug 2017

Funding

FundersFunder number
Italian National Institute for Nuclear Physics
Alexander von Humboldt-Stiftung
Natural Sciences and Engineering Research Council of Canada
Science and Technology Facilities CouncilST/N000447/1
Science and Technology Facilities Council
Deutsches Elektronen-Synchrotron
Deutsche Forschungsgemeinschaft
Ministry of Education, Culture, Sports, Science and TechnologyNSh-7989.2016.2
Ministry of Education, Culture, Sports, Science and Technology
Bundesministerium für Bildung und Forschung05h09GUF, 05 H09PDF, UM.C/625/1/HIR/ 149, SFB 676
Bundesministerium für Bildung und Forschung
Ministry of Higher Education, Malaysia
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Universiti MalayaER004-2012A, RU006-2013, RP012B-13AFR, RP012A-13AFR
Universiti Malaya

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