Studies of the diffractive photoproduction of isolated photons at HERA

Autor: A. Bruni, Enrico Tassi, G. Grzelak, Claire Gwenlan, Marco Schioppa, Leszek Adamczyk, Masaki Ishitsuka, Yuji Yamazaki, Volodymyr Myronenko, Mykhailo Lisovyi, Uta Klein, P. Stopa, B. B. Levchenko, I. Abt, O. Yu. Lukina, J. Tomaszewska, A. Longhin, Robert Ciesielski, Allen Caldwell, Elisabetta Gallo, Yu. Onishchuk, Oleksii Turkot, Zainol Abidin Ibrahim, O. Behnke, T. Tymieniecka, Marcin Pawel Guzik, A. M. Cooper-Sarkar, I. A. Korzhavina, Shoichi Yamada, R.C.E. Devenish, T. Schörner-Sadenius, Yu. A. Golubkov, E. Paul, Achim Geiser, A. Kotański, Masahiro Kuze, I. Kadenko, J. Sztuk-Dambietz, Andrii Verbytskyi, Marta Ruspa, S. Antonelli, Andrii Gizhko, U. Karshon, Aharon Levy, Y. Iga, W. Perlanski, S. Kananov, V. Aushev, E. Lohrmann, M. Adamus, A. Garfagnini, Grzegorz Gach, Af Zarnecki, F. Mohamad Idris, W. Slominski, Ewelina Lobodzinska, N. Z. Jomhari, U. Schneekloth, R. Hori, B. Löhr, R. Brugnera, D. Hochman, Yu.O. Shyrma, N.S. Pokrovskiy, Ian Brock, L. M. Shcheglova, P. J. Bussey, Ada Solano, Nataliia Kovalchuk, B.O. Zhautykov, D. H. Saxon, B. Foster, S. Dusini, L. Stanco, A. Stern, N. Mohammad Nasir, Oleg Kuprash, L. K. Gladilin, O. Zenaiev, R. K. Dementiev, I. O. Skillicorn, Ingo Bloch, Nazar Stefaniuk, Anna Mastroberardino, N. H. Brook, Matthew Wing, Mariusz Przybycien, Danuta Kisielewska, M. Corradi, Ulf Behrens, H. Kowalski, K. Wichmann, W. A. T. Wan Abdullah, A. Bertolin, L. Zawiejski, M. Turcato, Kunihiro Nagano, P. Kaur, Katsuo Tokushuku, J. Malka, J. Ciborowski, Janusz Chwastowski, A. Polini, T. Tsurugai, Marcella Capua, Robert Klanner, C. D. Catterall, O. Shkola, B. Krupa, O. Hlushchenko, Halina Abramowicz, Y. Aushev
Rok vydání: 2017
Předmět:
Photon
Physics and Astronomy (miscellaneous)
diffraction
photon: photoproduction
transverse energy [photon]
jet: transverse momentum
Jet (particle physics)
transverse momentum [jet]
01 natural sciences
High Energy Physics - Experiment
High Energy Physics - Experiment (hep-ex)
Pomeron
photoproduction [photon]
electron p
Nuclear Experiment
Monte Carlo
HERA
ZEUS
QCD
Photoproduction
Diffraction
colliding beams [electron p]
photon: transverse energy
Physics
Luminosity (scattering theory)
longitudinal momentum
Monte Carlo [numerical calculations]
HERA
DESY HERA Stor
electron p: colliding beams
Photoproduction
kinematics
Pseudorapidity
rapidity [jet]
numerical calculations: Monte Carlo
Diffraction
photoproduction
electron p: deep inelastic scattering
Particle physics
pomeron: interaction
diffraction: dissociation
FOS: Physical sciences
differential cross section: measured
Nuclear physics
measured [differential cross section]
0103 physical sciences
ddc:530
010306 general physics
ZEUS (particle detector)
rapidity [photon]
010308 nuclear & particles physics
High Energy Physics::Phenomenology
ZEUS
Deep inelastic scattering
QCD
rapidity
photon: rapidity
jet: rapidity
deep inelastic scattering [electron p]
High Energy Physics::Experiment
dissociation [diffraction]
interaction [pomeron]
experimental results
Zdroj: Physical review / D 96(3), 032006 (2017). doi:10.1103/PhysRevD.96.032006
ISSN: 2470-0029
2470-0010
DOI: 10.3204/PUBDB-2017-04272
Popis: Physical review / D 96(3), 032006(2017). doi:10.1103/PhysRevD.96.032006
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 $5 < E_T < 15$ GeV and $-0.7 < \eta < 0.9,$ inclusively and also with a jet with transverse energy and pseudorapidity in the ranges $4 < E_{jet} < 35$ GeV and $-1.5 < \eta_{jet} < 1.8,$ using a total integrated electron-proton 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 $z^{meas}_{Pomeron} > 0.9,$ where $z^{meas}_{Pomeron}$ is the fraction of the longitudinal momentum of the colourless 'Pomeron' exchange that is transferred to the photon-jet final state, giving evidence for direct Pomeron interactions.
Published by Inst., Woodbury, NY
Databáze: OpenAIRE
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