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. Bussey,A. Caldwell,M. Capua,C. D. Catterall,J. J. Chwastowski,J. Ciborowski,R. Ciesielski,A. M. Cooper-Sarkar,M. Corradi,R.K. Dementiev,R. C. E. Devenish,S. Dusini,B. Foster,Grzegorz Gach,E. Gallo,A. Garfagnini,A. Geiser,A. Gizhko,L. K. Gladilin,Yu. A. Golubkov,G. Grzelak,Marcin Pawel Guzik,C. Gwenlan,Olena 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, Andrzej Kotański,Nataliia Kovalchuk,H. Kowalski,B. Krupa,Oleg 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. Perlanski,N.S. Pokrovskiy,A. Polini,M. Przybycien,M. Ruspa,D. H. Saxon,M. Schioppa,U. Schneekloth,T. Schörner-Sadenius,L. M. Shcheglova,O. Shkola,Yu. Shyrma,I.O. Skillicorn,Wojciech 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,Wan Ahmad Tajuddin Wan Abdullah,Katarzyna Wichmann,M. Wing,S. Yamada,Y. Yamazaki,A. F. Żarnecki,L. Zawiejski,O. Zenaiev,B.O. Zhautykov

PHYSICAL REVIEW D（2017）

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摘要

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 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.

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关键词

diffractive photoproduction,isolated photons

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