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Further studies of isolated photon production with a jet in deep inelastic scattering at HERA

  • The ZEUS collaboration
  • H. Abramowicz
  • I. Abt
  • L. Adamczyk
  • M. Adamus
  • R. Aggarwal
  • 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. Kotanski
  • 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. 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
  • W. Slominski
  • 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. WingEmail author
  • S. Yamada
  • Y. Yamazaki
  • A. F. Żarnecki
  • L. Zawiejski
  • O. Zenaiev
  • B. O. Zhautykov
Open Access
Regular Article - Experimental Physics
  • 117 Downloads

Abstract

Isolated photons with high transverse energy have been studied in deep inelastic ep scattering with the ZEUS detector at HERA, using an integrated luminosity of 326 pb−1 in the range of exchanged-photon virtuality 10-350 GeV2. Outgoing isolated photons with transverse energy 4 < E T γ  < 15 GeV and pseudorapidity − 0.7 < η γ  < 0.9 were measured with accompanying jets having transverse energy and pseudorapidity 2.5 < E T jet  < 35 GeV and −1.5 < ηjet < 1.8, respectively. Differential cross sections are presented for the following variables: the fraction of the incoming photon energy and momentum that is transferred to the outgoing photon and the leading jet; the fraction of the incoming proton energy transferred to the photon and leading jet; the differences in azimuthal angle and pseudorapidity between the outgoing photon and the leading jet and between the outgoing photon and the scattered electron. Comparisons are made with theoretical predictions: a leading-logarithm Monte Carlo simulation, a next-to-leading-order QCD prediction, and a prediction using the k T -factorisation approach.

Keywords

Lepton-Nucleon Scattering (experiments) Photon production QCD 

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) 2018

Authors and Affiliations

  • The ZEUS collaboration
  • H. Abramowicz
    • 24
    • 47
  • I. Abt
    • 19
  • L. Adamczyk
    • 7
  • M. Adamus
    • 30
  • R. Aggarwal
    • 3
    • 34
  • S. Antonelli
    • 1
  • V. Aushev
    • 16
  • Y. Aushev
    • 16
  • O. Behnke
    • 9
  • U. Behrens
    • 9
  • A. Bertolin
    • 21
  • I. Bloch
    • 10
  • I. Brock
    • 2
  • N. H. Brook
    • 28
    • 48
  • R. Brugnera
    • 22
  • A. Bruni
    • 1
  • P. J. Bussey
    • 11
  • A. Caldwell
    • 19
  • M. Capua
    • 4
  • C. D. Catterall
    • 32
  • J. Chwastowski
    • 6
  • J. Ciborowski
    • 29
    • 49
  • R. Ciesielski
    • 9
    • 37
  • A. M. Cooper-Sarkar
    • 20
  • M. Corradi
    • 1
    • 33
  • R. K. Dementiev
    • 18
  • R. C. E. Devenish
    • 20
  • S. Dusini
    • 21
  • B. Foster
    • 12
    • 41
  • G. Gach
    • 7
  • E. Gallo
    • 12
    • 42
  • A. Garfagnini
    • 22
  • A. Geiser
    • 9
  • A. Gizhko
    • 9
  • L. K. Gladilin
    • 18
  • Yu. A. Golubkov
    • 18
  • G. Grzelak
    • 29
  • M. Guzik
    • 7
  • C. Gwenlan
    • 20
  • O. Hlushchenko
    • 16
    • 45
  • D. Hochman
    • 31
  • R. Hori
    • 13
  • Z. A. Ibrahim
    • 5
  • Y. Iga
    • 23
  • M. Ishitsuka
    • 25
  • N. Z. Jomhari
    • 5
  • I. Kadenko
    • 16
  • S. Kananov
    • 24
  • U. Karshon
    • 31
  • P. Kaur
    • 3
    • 35
  • D. Kisielewska
    • 7
  • R. Klanner
    • 12
  • U. Klein
    • 9
    • 38
  • I. A. Korzhavina
    • 18
  • A. Kotanski
    • 8
  • N. Kovalchuk
    • 12
  • H. Kowalski
    • 9
  • B. Krupa
    • 6
  • O. Kuprash
    • 9
    • 39
  • M. Kuze
    • 25
  • B. B. Levchenko
    • 18
  • A. Levy
    • 24
  • M. Lisovyi
    • 9
    • 40
  • E. Lobodzinska
    • 9
  • B. Löhr
    • 9
  • E. Lohrmann
    • 12
  • A. Longhin
    • 21
  • O. Yu. Lukina
    • 18
  • J. Malka
    • 9
  • A. Mastroberardino
    • 4
  • F. Mohamad Idris
    • 5
    • 36
  • N. Mohammad Nasir
    • 5
  • V. Myronenko
    • 9
  • K. Nagano
    • 13
  • Yu. Onishchuk
    • 16
  • E. Paul
    • 2
  • W. Perlanski
    • 29
  • N. S. Pokrovskiy
    • 14
  • A. Polini
    • 1
  • M. Przybycien
    • 7
  • M. Ruspa
    • 27
  • D. H. Saxon
    • 11
  • M. Schioppa
    • 4
  • U. Schneekloth
    • 9
  • T. Schörner-Sadenius
    • 9
  • L. M. Shcheglova
    • 18
    • 46
  • O. Shkola
    • 16
  • Yu. Shyrma
    • 15
  • I. O. Skillicorn
    • 11
  • W. Slominski
    • 8
  • A. Solano
    • 26
  • L. Stanco
    • 21
  • N. Stefaniuk
    • 9
  • A. Stern
    • 24
  • P. Stopa
    • 6
  • J. Sztuk-Dambietz
    • 12
    • 43
  • E. Tassi
    • 4
  • K. Tokushuku
    • 13
  • J. Tomaszewska
    • 29
    • 50
  • T. Tsurugai
    • 17
  • M. Turcato
    • 12
    • 43
  • O. Turkot
    • 9
  • T. Tymieniecka
    • 30
  • A. Verbytskyi
    • 19
  • W. A. T. Wan Abdullah
    • 5
  • K. Wichmann
    • 9
  • M. Wing
    • 28
    Email author
  • S. Yamada
    • 13
  • Y. Yamazaki
    • 13
    • 44
  • A. F. Żarnecki
    • 29
  • L. Zawiejski
    • 6
  • O. Zenaiev
    • 9
  • B. O. Zhautykov
    • 14
  1. 1.INFN BolognaBolognaItaly
  2. 2.Physikalisches Institut der Universität BonnBonnGermany
  3. 3.Panjab University, Department of PhysicsChandigarhIndia
  4. 4.Calabria University, Physics Department and INFNCosenzaItaly
  5. 5.National Centre for Particle PhysicsUniversiti MalayaKuala LumpurMalaysia
  6. 6.The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of SciencesKrakowPoland
  7. 7.AGH University of Science and Technology, Faculty of Physics and Applied Computer ScienceKrakowPoland
  8. 8.Department of PhysicsJagellonian UniversityKrakowPoland
  9. 9.Deutsches Elektronen-Synchrotron DESYHamburgGermany
  10. 10.Deutsches Elektronen-Synchrotron DESYZeuthenGermany
  11. 11.School of Physics and AstronomyUniversity of GlasgowGlasgowUnited Kingdom
  12. 12.Hamburg University, Institute of Experimental PhysicsHamburgGermany
  13. 13.Institute of Particle and Nuclear Studies, KEKTsukubaJapan
  14. 14.Institute of Physics and Technology of Ministry of Education and Science of KazakhstanAlmatyKazakhstan
  15. 15.Institute for Nuclear Research, National Academy of SciencesKyivUkraine
  16. 16.Department of Nuclear PhysicsNational Taras Shevchenko University of KyivKyivUkraine
  17. 17.Meiji Gakuin University, Faculty of General EducationYokohamaJapan
  18. 18.Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear PhysicsMoscowRussia
  19. 19.Max-Planck-Institut für PhysikMünchenGermany
  20. 20.Department of PhysicsUniversity of OxfordOxfordUnited Kingdom
  21. 21.INFN PadovaPadovaItaly
  22. 22.Dipartimento di Fisica e Astronomia dell’ Università and INFNPadovaItaly
  23. 23.Polytechnic UniversityTokyoJapan
  24. 24.Raymond and Beverly Sackler Faculty of Exact Sciences, School of PhysicsTel Aviv UniversityTel AvivIsrael
  25. 25.Department of PhysicsTokyo Institute of TechnologyTokyoJapan
  26. 26.Università di Torino and INFNTorinoItaly
  27. 27.Università del Piemonte Orientale, Novara, and INFNTorinoItaly
  28. 28.Physics and Astronomy DepartmentUniversity College LondonLondonUnited Kingdom
  29. 29.Faculty of PhysicsUniversity of WarsawWarsawPoland
  30. 30.National Centre for Nuclear ResearchWarsawPoland
  31. 31.Department of Particle Physics and AstrophysicsWeizmann InstituteRehovotIsrael
  32. 32.Department of PhysicsYork UniversityTorontoCanada
  33. 33.INFN RomaRomaItaly
  34. 34.DST-Inspire FacultyPune UniversityPuneIndia
  35. 35.Sant Longowal Institute of Engineering and Technology, LongowalPunjabIndia
  36. 36.Agensi Nuklear MalaysiaKajangMalaysia
  37. 37.Rockefeller UniversityNew YorkUSA
  38. 38.University of LiverpoolLiverpoolUnited Kingdom
  39. 39.Tel Aviv UniversityTel AvivIsrael
  40. 40.Physikalisches InstitutUniversität HeidelbergHeidelbergGermany
  41. 41.DESY and University of OxfordHamburgGermany
  42. 42.DESYHamburgGermany
  43. 43.European X-ray Free-Electron Laser facility GmbHHamburgGermany
  44. 44.Kobe UniversityKobeJapan
  45. 45.RWTH AachenAachenGermany
  46. 46.University of BristolBristolUnited Kingdom
  47. 47.Max Planck Institute for PhysicsMunichGermany
  48. 48.University of BathBathUnited Kingdom
  49. 49.Lódz UniversityLódzPoland
  50. 50.Polish Air Force Academy in DeblinDeblinPoland

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