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Further studies of the photoproduction of isolated photons with a jet at HERA

  • The ZEUS collaboration
  • H. Abramowicz
  • I. Abt
  • L. Adamczyk
  • M. Adamus
  • R. Aggarwal
  • S. Antonelli
  • O. Arslan
  • V. Aushev
  • Y. Aushev
  • O. Bachynska
  • A. N. Barakbaev
  • N. Bartosik
  • O. Behnke
  • J. Behr
  • U. Behrens
  • A. Bertolin
  • S. Bhadra
  • I. Bloch
  • V. Bokhonov
  • E. G. Boos
  • K. Borras
  • I. Brock
  • R. Brugnera
  • A. Bruni
  • B. Brzozowska
  • P. J. Bussey
  • A. Caldwell
  • M. Capua
  • C. D. Catterall
  • J. Chwastowski
  • J. Ciborowski
  • R. Ciesielski
  • A. M. Cooper-Sarkar
  • M. Corradi
  • F. Corriveau
  • G. D’Agostini
  • R. K. Dementiev
  • R. C. E. Devenish
  • G. Dolinska
  • V. Drugakov
  • S. Dusini
  • J. Ferrando
  • J. Figiel
  • B. Foster
  • G. Gach
  • A. Garfagnini
  • A. Geiser
  • A. Gizhko
  • L. K. Gladilin
  • O. Gogota
  • Yu.A. Golubkov
  • J. Grebenyuk
  • I. Gregor
  • G. Grzelak
  • O. Gueta
  • M. Guzik
  • W. Hain
  • G. Hartner
  • D. Hochman
  • R. Hori
  • Z. A. Ibrahim
  • Y. Iga
  • M. Ishitsuka
  • A. Iudin
  • F. Januschek
  • I. Kadenko
  • S. Kananov
  • T. Kanno
  • U. Karshon
  • M. Kaur
  • P. Kaur
  • L. A. Khein
  • D. Kisielewska
  • R. Klanner
  • U. Klein
  • N. Kondrashova
  • O. Kononenko
  • Ie. Korol
  • I. A. Korzhavina
  • A. Kotanski
  • U. Kötz
  • N. Kovalchuk
  • H. Kowalski
  • O. Kuprash
  • M. Kuze
  • B. B. Levchenko
  • A. Levy
  • V. Libov
  • S. Limentani
  • M. Lisovyi
  • E. Lobodzinska
  • W. Lohmann
  • B. Löhr
  • E. Lohrmann
  • A. Longhin
  • D. Lontkovskyi
  • O.Yu. Lukina
  • J. Maeda
  • I. Makarenko
  • J. Malka
  • J. F. Martin
  • S. Mergelmeyer
  • F. Mohamad Idris
  • K. Mujkic
  • V. Myronenko
  • K. Nagano
  • A. Nigro
  • T. Nobe
  • D. Notz
  • R. J. Nowak
  • K. Olkiewicz
  • Yu. Onishchuk
  • E. Paul
  • W. Perlanski
  • H. Perrey
  • N. S. Pokrovskiy
  • A. S. Proskuryakov
  • M. Przybycien
  • A. Raval
  • P. Roloff
  • I. Rubinsky
  • M. Ruspa
  • V. Samojlov
  • D. H. Saxon
  • M. Schioppa
  • W. B. Schmidke
  • U. Schneekloth
  • T. Schörner-Sadenius
  • J. Schwartz
  • L. M. Shcheglova
  • R. Shevchenko
  • O. Shkola
  • I. Singh
  • I. O. Skillicorn
  • W. Slominski
  • V. Sola
  • A. Solano
  • A. Spiridonov
  • L. Stanco
  • N. Stefaniuk
  • A. Stern
  • T. P. Stewart
  • P. Stopa
  • J. Sztuk-Dambietz
  • D. Szuba
  • J. Szuba
  • E. Tassi
  • T. Temiraliev
  • K. Tokushuku
  • J. Tomaszewska
  • A. Trofymov
  • V. Trusov
  • T. Tsurugai
  • M. Turcato
  • O. Turkot
  • T. Tymieniecka
  • A. Verbytskyi
  • O. Viazlo
  • R. Walczak
  • W. A. T. Wan Abdullah
  • K. Wichmann
  • M. Wing
  • G. Wolf
  • S. Yamada
  • Y. Yamazaki
  • N. Zakharchuk
  • A. F. Żarnecki
  • L. Zawiejski
  • O. Zenaiev
  • B. O. Zhautykov
  • N. Zhmak
  • D. S. Zotkin
Open Access
Article

Abstract

In this extended analysis using the ZEUS detector at HERA, the photoproduction of isolated photons together with a jet is measured for different ranges of the fractional photon energy, x γ meas , contributing to the photon-jet final state. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 6 < E T γ < 15 GeV and −0.7 < η γ < 0.9, and for jet transverse-energy and pseudorapidity ranges 4 < E T jet < 35 GeV and −1.5 < η jet < 1.8, for an integrated luminosity of 374 pb−1. The kinematic observables studied comprise the transverse energy and pseudorapidity of the photon and the jet, the azimuthal difference between them, the fraction of proton energy taking part in the interaction, and the difference between the pseudorapidities of the photon and the jet. Higher-order theoretical calculations are compared to the results.

Keywords

Lepton-Nucleon Scattering QCD Photon production 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2014

Authors and Affiliations

  • The ZEUS collaboration
  • H. Abramowicz
    • 27
    • 50
  • I. Abt
    • 21
  • L. Adamczyk
    • 8
  • M. Adamus
    • 34
  • R. Aggarwal
    • 4
  • S. Antonelli
    • 2
  • O. Arslan
    • 3
  • V. Aushev
    • 16
    • 17
  • Y. Aushev
    • 17
  • O. Bachynska
    • 10
  • A. N. Barakbaev
    • 15
  • N. Bartosik
    • 10
  • O. Behnke
    • 10
  • J. Behr
    • 10
  • U. Behrens
    • 10
  • A. Bertolin
    • 23
  • S. Bhadra
    • 36
  • I. Bloch
    • 11
  • V. Bokhonov
    • 16
  • E. G. Boos
    • 15
  • K. Borras
    • 10
  • I. Brock
    • 3
  • R. Brugnera
    • 24
  • A. Bruni
    • 1
  • B. Brzozowska
    • 33
  • P. J. Bussey
    • 12
  • A. Caldwell
    • 21
  • M. Capua
    • 5
  • C. D. Catterall
    • 36
  • J. Chwastowski
    • 7
    • 39
  • J. Ciborowski
    • 33
    • 52
  • R. Ciesielski
    • 10
    • 40
  • A. M. Cooper-Sarkar
    • 22
  • M. Corradi
    • 1
  • F. Corriveau
    • 18
  • G. D’Agostini
    • 26
  • R. K. Dementiev
    • 20
  • R. C. E. Devenish
    • 22
  • G. Dolinska
    • 10
  • V. Drugakov
    • 11
  • S. Dusini
    • 23
  • J. Ferrando
    • 12
  • J. Figiel
    • 7
  • B. Foster
    • 13
    • 44
  • G. Gach
    • 8
  • A. Garfagnini
    • 24
  • A. Geiser
    • 10
  • A. Gizhko
    • 10
  • L. K. Gladilin
    • 20
  • O. Gogota
    • 17
  • Yu.A. Golubkov
    • 20
  • J. Grebenyuk
    • 10
  • I. Gregor
    • 10
  • G. Grzelak
    • 33
  • O. Gueta
    • 27
  • M. Guzik
    • 8
  • W. Hain
    • 10
  • G. Hartner
    • 36
  • D. Hochman
    • 35
  • R. Hori
    • 14
  • Z. A. Ibrahim
    • 6
  • Y. Iga
    • 25
  • M. Ishitsuka
    • 28
  • A. Iudin
    • 17
  • F. Januschek
    • 10
  • I. Kadenko
    • 17
  • S. Kananov
    • 27
  • T. Kanno
    • 28
  • U. Karshon
    • 35
  • M. Kaur
    • 4
  • P. Kaur
    • 4
  • L. A. Khein
    • 20
  • D. Kisielewska
    • 8
  • R. Klanner
    • 13
  • U. Klein
    • 10
    • 41
  • N. Kondrashova
    • 17
    • 47
  • O. Kononenko
    • 17
  • Ie. Korol
    • 10
  • I. A. Korzhavina
    • 20
  • A. Kotanski
    • 9
  • U. Kötz
    • 10
  • N. Kovalchuk
    • 17
  • H. Kowalski
    • 10
  • O. Kuprash
    • 10
  • M. Kuze
    • 28
  • B. B. Levchenko
    • 20
  • A. Levy
    • 27
  • V. Libov
    • 10
  • S. Limentani
    • 24
  • M. Lisovyi
    • 10
  • E. Lobodzinska
    • 10
  • W. Lohmann
    • 11
  • B. Löhr
    • 10
  • E. Lohrmann
    • 13
  • A. Longhin
    • 23
    • 49
  • D. Lontkovskyi
    • 10
  • O.Yu. Lukina
    • 20
  • J. Maeda
    • 28
    • 51
  • I. Makarenko
    • 10
  • J. Malka
    • 10
  • J. F. Martin
    • 31
  • S. Mergelmeyer
    • 3
  • F. Mohamad Idris
    • 6
    • 38
  • K. Mujkic
    • 10
  • V. Myronenko
    • 10
  • K. Nagano
    • 14
  • A. Nigro
    • 26
  • T. Nobe
    • 28
  • D. Notz
    • 10
  • R. J. Nowak
    • 33
  • K. Olkiewicz
    • 7
  • Yu. Onishchuk
    • 17
  • E. Paul
    • 3
  • W. Perlanski
    • 33
  • H. Perrey
    • 10
  • N. S. Pokrovskiy
    • 15
  • A. S. Proskuryakov
    • 20
  • M. Przybycien
    • 8
  • A. Raval
    • 10
  • P. Roloff
    • 10
    • 42
  • I. Rubinsky
    • 10
  • M. Ruspa
    • 30
  • V. Samojlov
    • 15
  • D. H. Saxon
    • 12
  • M. Schioppa
    • 5
  • W. B. Schmidke
    • 21
    • 48
  • U. Schneekloth
    • 10
  • T. Schörner-Sadenius
    • 10
  • J. Schwartz
    • 18
  • L. M. Shcheglova
    • 20
  • R. Shevchenko
    • 17
  • O. Shkola
    • 17
  • I. Singh
    • 4
    • 37
  • I. O. Skillicorn
    • 12
  • W. Slominski
    • 9
  • V. Sola
    • 13
  • A. Solano
    • 29
  • A. Spiridonov
    • 10
    • 43
  • L. Stanco
    • 23
  • N. Stefaniuk
    • 10
  • A. Stern
    • 27
  • T. P. Stewart
    • 31
  • P. Stopa
    • 7
  • J. Sztuk-Dambietz
    • 13
  • D. Szuba
    • 13
  • J. Szuba
    • 10
  • E. Tassi
    • 5
  • T. Temiraliev
    • 15
  • K. Tokushuku
    • 14
    • 45
  • J. Tomaszewska
    • 33
    • 53
  • A. Trofymov
    • 17
  • V. Trusov
    • 17
  • T. Tsurugai
    • 19
  • M. Turcato
    • 13
  • O. Turkot
    • 10
  • T. Tymieniecka
    • 34
  • A. Verbytskyi
    • 21
  • O. Viazlo
    • 17
  • R. Walczak
    • 22
  • W. A. T. Wan Abdullah
    • 6
  • K. Wichmann
    • 10
  • M. Wing
    • 32
  • G. Wolf
    • 10
  • S. Yamada
    • 14
  • Y. Yamazaki
    • 14
    • 46
  • N. Zakharchuk
    • 17
  • A. F. Żarnecki
    • 33
  • L. Zawiejski
    • 7
  • O. Zenaiev
    • 10
  • B. O. Zhautykov
    • 15
  • N. Zhmak
    • 16
  • D. S. Zotkin
    • 20
  1. 1.INFN BolognaBolognaItaly
  2. 2.University and INFN BolognaBolognaItaly
  3. 3.Physikalisches Institut der Universität BonnBonnGermany
  4. 4.Panjab University, Department of PhysicsChandigarhIndia
  5. 5.Calabria University, Physics Department and INFNCosenzaItaly
  6. 6.National Centre for Particle Physics, Universiti MalayaKuala LumpurMalaysia
  7. 7.The Henryk Niewodniczanski Institute of Nuclear PhysicsPolish Academy of SciencesKrakowPoland
  8. 8.AGH-University of Science and Technology, Faculty of Physics and Applied Computer ScienceKrakowPoland
  9. 9.Department of PhysicsJagellonian UniversityCracowPoland
  10. 10.Deutsches Elektronen-Synchrotron DESYHamburgGermany
  11. 11.Deutsches Elektronen-Synchrotron DESYZeuthenGermany
  12. 12.School of Physics and AstronomyUniversity of GlasgowGlasgowUnited Kingdom
  13. 13.Hamburg University, Institute of Experimental PhysicsHamburgGermany
  14. 14.Institute of Particle and Nuclear Studies, KEKTsukubaJapan
  15. 15.Institute of Physics and Technology of Ministry of Education and Science of KazakhstanAlmatyKazakhstan
  16. 16.Institute for Nuclear Research, National Academy of SciencesKyivUkraine
  17. 17.Department of Nuclear PhysicsNational Taras Shevchenko University of KyivKyivUkraine
  18. 18.Department of PhysicsMcGill UniversityMontréalCanada
  19. 19.Meiji Gakuin University, Faculty of General EducationYokohamaJapan
  20. 20.Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear PhysicsMoscowRussia
  21. 21.Max-Planck-Institut für PhysikMünchenGermany
  22. 22.Department of PhysicsUniversity of OxfordOxfordUnited Kingdom
  23. 23.INFN PadovaPadovaItaly
  24. 24.Dipartimento di Fisica e Astronomia dell’ Università and INFNPadovaItaly
  25. 25.Polytechnic UniversityTokyoJapan
  26. 26.Dipartimento di Fisica, Università ‘La Sapienza’ and INFNRomeItaly
  27. 27.Raymond and Beverly Sackler Faculty of Exact Sciences, School of PhysicsTel Aviv UniversityTel AvivIsrael
  28. 28.Department of PhysicsTokyo Institute of TechnologyTokyoJapan
  29. 29.Università di Torino and INFNTorinoItaly
  30. 30.Università del Piemonte Orientale, Novara, and INFNTorinoItaly
  31. 31.Department of PhysicsUniversity of TorontoTorontoCanada
  32. 32.Physics and Astronomy DepartmentUniversity College LondonLondonUnited Kingdom
  33. 33.Faculty of PhysicsUniversity of WarsawWarsawPoland
  34. 34.National Centre for Nuclear ResearchWarsawPoland
  35. 35.Department of Particle Physics and AstrophysicsWeizmann InstituteRehovotIsrael
  36. 36.Department of PhysicsYork UniversityTorontoCanada
  37. 37.Sri Guru Granth Sahib World UniversityFatehgarh SahibIndia
  38. 38.Agensi Nuklear MalaysiaKajang, BangiMalaysia
  39. 39.Cracow University of Technology, Faculty of Physics, Mathematics and Applied Computer ScienceKrakówPoland
  40. 40.Rockefeller UniversityNew YorkU.S.A.
  41. 41.University of LiverpoolLiverpoolUnited Kingdom
  42. 42.CERNGenevaSwitzerland
  43. 43.Institute of Theoretical and Experimental PhysicsMoscowRussia
  44. 44.DESY and University of OxfordOxfordUK
  45. 45.University of TokyoTokyoJapan
  46. 46.Kobe UniversityKobeJapan
  47. 47.DESY ATLAS groupHamburgGermany
  48. 48.BNLFoxboroughU.S.A.
  49. 49.LNFFrascatiItaly
  50. 50.Max Planck Institute for PhysicsMunichGermany
  51. 51.Tokyo Metropolitan UniversityTokyoJapan
  52. 52.Lódz UniversityLódzPoland
  53. 53.Polish Air Force Academy in DeblinDeblinPoland

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