Machine Learning-Assisted Measurement of Lepton-Jet Azimuthal Angular Asymmetries in Deep-Inelastic Scattering at HERA

HAL (Le Centre pour la Communication Scientifique Directe)

Abstract

In deep-inelastic positron-proton scattering, the lepton-jet azimuthal angular asymmetry is measured using data collected with the H1 detector at HERA. When the average transverse momentum of the lepton-jet system, $\lvert \vec{P}_\perp \rvert $, is much larger than the total transverse momentum of the system, $\lvert \vec{q}_\perp \rvert$, the asymmetry between parallel and antiparallel configurations, $\vec{P}_\perp$ and $\vec{q}_\perp$, is expected to be generated by initial and final state soft gluon radiation and can be predicted using perturbation theory. Quantifying the angular properties of the asymmetry therefore provides an additional test of the strong force. Studying the asymmetry is important for future measurements of intrinsic asymmetries generated by the proton's constituents through Transverse Momentum Dependent (TMD) Parton Distribution Functions (PDFs), where this asymmetry constitutes a dominant background. Moments of the azimuthal asymmetries are measured using a machine learning method for unfolding that does not require binning.

Authors 77

1. M. Arratia

   University of California, Riverside

   Affiliation as printed

   University of California, Riverside, CA 92521, USA

2. A. Baghdasaryan

   A. Alikhanyan National Laboratory

   Affiliation as printed

   Yerevan Physics Institute, Yerevan, Armenia

3. Austin Baty

   University of Illinois Chicago

   Affiliation as printed

   University of Illinois, Chicago, IL 60607, USA

4. K. Begzsuren

   Mongolian Academy of Sciences · Institute of Physics and Technology

   Affiliation as printed

   Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia

5. A. E. Bolz

   Deutsches Elektronen-Synchrotron DESY · Laboratoire Leprince-Ringuet

   Affiliation as printed

   Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

   LLR - Laboratoire Leprince-Ringuet (Route de Saclay, 91128 Palaiseau Cedex - France)

6. V. Boudry

   Centre National de la Recherche Scientifique · École Polytechnique · Institut National de Physique Nucléaire et de Physique des Particules

   Affiliation as printed

   LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France

7. G. Brandt

   University of Göttingen

   Affiliation as printed

   II. Physikalisches Institut, Universität Göttingen, Göttingen, Germany

8. D. Britzger
   Affiliation as printed

   Max-Planck-Institut für Physik, Garching, Germany

9. A. Buniatyan

   University of Birmingham

   Affiliation as printed

   School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom

10. L. Bystritskaya

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Affiliated with an institute covered by a current or former collaboration agreement with DESY

11. K. B. Cantún-Avila

    Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional

    Affiliation as printed

    Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, México

12. K. Černý

    Palacký University Olomouc

    Affiliation as printed

    Joint Laboratory of Optics, Palacký University, Olomouc, Czech Republic

13. Vladimir Chekelian
    Affiliation as printed

    Max-Planck-Institut für Physik, Garching, Germany

14. Z Chen

    Shandong University

    Affiliation as printed

    Shandong University, Shandong, P.R.China

15. J. Cvach

    Czech Academy of Sciences · FZU - Institute of Physics of the Czech Academy of Sciences

    Affiliation as printed

    Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic

16. K. Daum

    University of Wuppertal

    Affiliation as printed

    Fachbereich C, Universität Wuppertal, Wuppertal, Germany

17. Abhay Deshpande

    Brookhaven National Laboratory · Centre de physique des particules de Marseille · Stony Brook University

    Affiliation as printed

    Stony Brook University, Stony Brook, NY 11794, USA

    Brookhaven National Laboratory, Upton, NY 11973, USA

    CPPM - Centre de Physique des Particules de Marseille (163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09 - France)

18. CRISTINEL DIACONU

    Centre National de la Recherche Scientifique · Aix-Marseille Université · Centre de physique des particules de Marseille · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France

19. A. Drees

    Stony Brook University

    Affiliation as printed

    Stony Brook University, Stony Brook, NY 11794, USA

20. G. Eckerlin

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

21. S. Egli

    Paul Scherrer Institute

    Affiliation as printed

    Paul Scherrer Institut, Villigen, Switzerland

22. E. Elsen

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

23. L. Favart

    University of Antwerp · Interuniversity Institute for High Energies

    Affiliation as printed

    Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp, Belgium

24. A. Fedotov

    Commissariat à l'Énergie Atomique et aux Énergies Alternatives · CEA Paris-Saclay - Etablissement de Saclay · Deutsches Elektronen-Synchrotron DESY · CEA Paris-Saclay · Institut de Recherche sur les Lois Fondamentales de l'Univers

    Affiliation as printed

    Affiliated with an institute covered by a current or former collaboration agreement with DESY

    IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (CEA Saclay F-91191 Gif sur Yvette cedex - France)

25. J. Feltesse

    Commissariat à l'Énergie Atomique et aux Énergies Alternatives · Université Paris-Saclay · Institut de Recherche sur les Lois Fondamentales de l'Univers

    Affiliation as printed

    IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France

26. M. Fleischer

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

27. A. M. Fomenko

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Affiliated with an institute covered by a current or former collaboration agreement with DESY

28. C. Gal

    Stony Brook University

    Affiliation as printed

    Stony Brook University, Stony Brook, NY 11794, USA

29. J. Gayler

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

30. Lidia GOERLICH

    Institute of Nuclear Physics, Polish Academy of Sciences

    Affiliation as printed

    Institute of Nuclear Physics Polish Academy of Sciences, Krakow, Poland

31. N. Gogitidze

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

32. M. Gouzevitch

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Affiliated with an institute covered by a current or former collaboration agreement with DESY

33. Christoph Grab

    ETH Zurich

    Affiliation as printed

    Institut für Teilchenphysik, ETH, Zürich, Switzerland

34. T. Greenshaw

    University of Liverpool

    Affiliation as printed

    Department of Physics, University of Liverpool, Liverpool, United Kingdom

35. G. Grindhammer
    Affiliation as printed

    Max-Planck-Institut für Physik, Garching, Germany

36. D. Haidt

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

37. J. Hessler
    Affiliation as printed

    Max-Planck-Institut für Physik, Garching, Germany

38. J. Hladký

    Czech Academy of Sciences · Centre de physique des particules de Marseille · FZU - Institute of Physics of the Czech Academy of Sciences

    Affiliation as printed

    Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic

    CPPM - Centre de Physique des Particules de Marseille (163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09 - France)

39. Dirk Hoffmann

    Centre National de la Recherche Scientifique · Aix-Marseille Université · Centre de physique des particules de Marseille · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France

40. R. Horisberger

    Paul Scherrer Institute

    Affiliation as printed

    Paul Scherrer Institut, Villigen, Switzerland

41. T. Hreus

    University of Zurich

    Affiliation as printed

    Physik-Institut der Universität Zürich, Zürich, Switzerland

42. X. Janssen

    University of Antwerp · Interuniversity Institute for High Energies

    Affiliation as printed

    Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp, Belgium

43. Judith M. Katzy

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

44. C Kiesling
    Affiliation as printed

    Max-Planck-Institut für Physik, Garching, Germany

45. M. Klein

    University of Liverpool

    Affiliation as printed

    Department of Physics, University of Liverpool, Liverpool, United Kingdom

46. Claus Kleinwort

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

47. R. Kogler

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

48. Peter Kostka

    University of Liverpool

    Affiliation as printed

    Department of Physics, University of Liverpool, Liverpool, United Kingdom

49. J. Kretzschmar

    University of Liverpool

    Affiliation as printed

    Department of Physics, University of Liverpool, Liverpool, United Kingdom

50. Dirk Krücker

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

51. K. Krüger

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

52. W. Lange

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

53. Paul Laycock

    Brookhaven National Laboratory

    Affiliation as printed

    Brookhaven National Laboratory, Upton, NY 11973, USA

54. S. Levonian

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

55. J. Lin

    Rice University

    Affiliation as printed

    Rice University, Houston, TX 77005-1827, USA

56. K. Lipka

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

57. B. List

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

58. Jenny List

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

59. Bogdan Lobodzinski
    Affiliation as printed

    Max-Planck-Institut für Physik, Garching, Germany

60. E. Malinovski

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Affiliated with an institute covered by a current or former collaboration agreement with DESY

61. A. Mehta

    University of Liverpool

    Affiliation as printed

    Department of Physics, University of Liverpool, Liverpool, United Kingdom

62. Stanislaw Mikocki

    Institute of Nuclear Physics, Polish Academy of Sciences

    Affiliation as printed

    Institute of Nuclear Physics Polish Academy of Sciences, Krakow, Poland

63. V. M. Mikuni

    Lawrence Berkeley National Laboratory

    Affiliation as printed

    Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

64. K. Müller

    University of Zurich

    Affiliation as printed

    Physik-Institut der Universität Zürich, Zürich, Switzerland

65. Benjamin Philip Nachman

    Lawrence Berkeley National Laboratory

    Affiliation as printed

    Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

66. T. Naumann

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

67. C. Niebuhr

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

68. G. Nowak

    Institute of Nuclear Physics, Polish Academy of Sciences

    Affiliation as printed

    Institute of Nuclear Physics Polish Academy of Sciences, Krakow, Poland

69. Dmitry Ozerov

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Affiliated with an institute covered by a current or former collaboration agreement with DESY

70. S Park

    Laboratoire de Physique des 2 Infinis Irène Joliot-Curie · Stony Brook University

    Affiliation as printed

    Stony Brook University, Stony Brook, NY 11794, USA

    IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (Bât. 100 et 200, 15 rue Georges Clémenceau 91405 Orsay - France)

71. C. Pascaud

    Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut National de Physique Nucléaire et de Physique des Particules · Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

    Affiliation as printed

    IJCLab, Université Paris-Saclay, CNRS/IN2P3, Orsay, France

72. E Perez

    European Organization for Nuclear Research

    Affiliation as printed

    CERN, Geneva, Switzerland

73. Alexey Petrukhin

    University of Siegen

    Affiliation as printed

    Fakultät IV - Department für Physik, Universität Siegen, Siegen, Germany

74. Ivana Picuric

    University of Montenegro

    Affiliation as printed

    Faculty of Science, University of Montenegro, Podgorica, Montenegro

75. D. Pitzl

    Deutsches Elektronen-Synchrotron DESY

    Affiliation as printed

    Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany

76. Voica Ana Maria Radescu

    Heidelberg University

    Affiliation as printed

    Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany

77. Natasa Raicevic

    University of Montenegro

    Affiliation as printed

    Faculty of Science, University of Montenegro, Podgorica, Montenegro