Data di Pubblicazione:
2017
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 < E_T(gamma) < 15 GeV and -0.7 < eta(gamma) < 0.9, inclusively, and also with a jet with transverse energy and pseudorapidity in the ranges 4 < E_T(jet) < 35 GeV and -1.5 < 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(P)(meas) > 0.9, where z(P)(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.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
HERA, ZEUS, QCD, Photoproduction, Diffraction,
Elenco autori:
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. Chwastowski; J. 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. Słomiński; 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. Żarnecki; L. Zawiejski; O. Zenaiev; B. O. Zhautykov
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