Search for D 0 meson decays to π + π − e + e − and K + K − e + e − final states

Physical review. D/Physical review. D., vol. 111

Abstract

A search for D 0 meson decays to the π + π − e + e − and K + K − e + e − final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb − 1 . The decay D 0 → π + π − e + e − is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a ϕ or ρ 0 / ω meson. The corresponding branching fractions are measured relative to the D 0 → K − π − [ e + e − ] ρ 0 / ω decay, where the two electrons are consistent with coming from the decay of a ρ 0 or ω meson. No evidence is found for the D 0 → K + K − e + e − decay and world-best limits are set on its branching fraction. The results are compared to, and found to be consistent with, the branching fractions of the D 0 → π + π − μ + μ − and D 0 → K + K − μ + μ − decays recently measured by LHCb and confirm lepton universality at the current precision.

Authors 100

1. R. Aaij

   National Institute for Subatomic Physics

   Affiliation as printed

   Nikhef National Institute for Subatomic Physics

2. A. S. W. Abdelmotteleb

   University of Warwick

   Affiliation as printed

   University of Warwick

3. Carlos Abellán Beteta

   University of Zurich

   Affiliation as printed

   Universität Zürich

4. F. Abudinén

   University of Warwick

   Affiliation as printed

   University of Warwick

5. T. Ackernley

   University of Liverpool

   Affiliation as printed

   University of Liverpool

6. A. A. Adefisoye

   Syracuse University

   Affiliation as printed

   Syracuse University

7. B. Adeva

   Universidade de Santiago de Compostela

   Affiliation as printed

   Universidade de Santiago de Compostela

8. M. Adinolfi

   University of Bristol

   Affiliation as printed

   University of Bristol

9. P. Adlarson

   Uppsala University · University of Glasgow

   Affiliation as printed

   University of Glasgow

   Uppsala University

10. C. Agapopoulou

    Université Paris-Saclay

    Affiliation as printed

    Université Paris-Saclay

11. C. Aidala

    University of Michigan · Syracuse University

    Affiliation as printed

    Syracuse University

    University of Michigan

12. Z. Ajaltouni

    Université Clermont Auvergne

    Affiliation as printed

    Université Clermont Auvergne

13. S. Akar

    Université Clermont Auvergne

    Affiliation as printed

    Université Clermont Auvergne

14. K. Carvalho Akiba

    National Institute for Subatomic Physics

    Affiliation as printed

    Nikhef National Institute for Subatomic Physics

15. P. Albicocco

    Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

    Affiliation as printed

    INFN Laboratori Nazionali di Frascati

16. J. Albrecht

    TU Dortmund University

    Affiliation as printed

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

17. F. Alessio

    European Organization for Nuclear Research

    Affiliation as printed

    European Organization for Nuclear Research (CERN), Geneva, Switzerland

18. Michael Thomas Alexander

    University of Glasgow

    Affiliation as printed

    University of Glasgow

19. Zakariya Aliouche

    University of Manchester

    Affiliation as printed

    University of Manchester

20. P. Álvarez Cartelle

    University of Cambridge

    Affiliation as printed

    University of Cambridge

21. R. Amalric

    Sorbonne Université

    Affiliation as printed

    Sorbonne Université

22. S. Amato

    Universidade Federal do Rio de Janeiro

    Affiliation as printed

    Universidade Federal do Rio de Janeiro (UFRJ)

23. J. L. Amey

    University of Bristol

    Affiliation as printed

    University of Bristol

24. Y. Amhis

    Université Paris-Saclay

    Affiliation as printed

    Université Paris-Saclay

25. Liupan An

    Peking University

    Affiliation as printed

    Peking University

26. L. Anderlini

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    Affiliation as printed

    INFN Sezione di Firenze

27. M. Andersson

    University of Zurich

    Affiliation as printed

    Universität Zürich

28. A. Andreianov

    European Organization for Nuclear Research

    Affiliation as printed

    CERN

29. P. Andreola

    University of Zurich

    Affiliation as printed

    Universität Zürich

30. M. Andreotti

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara

31. D. Andreou

    Syracuse University

    Affiliation as printed

    Syracuse University

32. Alessia Anelli

    Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca · European Organization for Nuclear Research

    Affiliation as printed

    European Organization for Nuclear Research (CERN), Geneva, Switzerland

    INFN Sezione di Milano-Bicocca

33. D. Ao

    University of Chinese Academy of Sciences

    Affiliation as printed

    University of Chinese Academy of Sciences

34. F. Archilli

    Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata

    Affiliation as printed

    INFN Sezione di Roma Tor Vergata

35. Matteo Argenton

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara

36. S. Arguedas Cuendis

    Consejo Nacional de Rectores · European Organization for Nuclear Research

    Affiliation as printed

    Consejo Nacional de Rectores (CONARE)

    European Organization for Nuclear Research (CERN), Geneva, Switzerland

37. A. Artamonov

    European Organization for Nuclear Research

    Affiliation as printed

    CERN

38. M. Artuso

    Syracuse University

    Affiliation as printed

    Syracuse University

39. E. Aslanides

    Aix-Marseille Université

    Affiliation as printed

    Aix Marseille Univ

40. R. Ataíde Da Silva

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Ecole Polytechnique Fédérale de Lausanne (EPFL)

41. M. Atzeni

    Massachusetts Institute of Technology

    Affiliation as printed

    Massachusetts Institute of Technology

42. B. Audurier

    Université Paris-Saclay

    Affiliation as printed

    Université Paris-Saclay

43. D. Bacher

    University of Oxford

    Affiliation as printed

    University of Oxford

44. I. Bachiller

    Université Savoie Mont Blanc

    Affiliation as printed

    Université Savoie Mont Blanc

45. S. Bachmann

    Heidelberg University

    Affiliation as printed

    Ruprecht-Karls-Universität Heidelberg

46. Marie Bachmayer

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Ecole Polytechnique Fédérale de Lausanne (EPFL)

47. John J Back

    University of Warwick

    Affiliation as printed

    University of Warwick

48. P. Baladrón Rodríguez

    Universidade de Santiago de Compostela

    Affiliation as printed

    Universidade de Santiago de Compostela

49. V. Balagura

    Laboratoire Leprince-Ringuet

    Affiliation as printed

    Laboratoire Leprince-Ringuet

50. Alessandro Balboni

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara

51. W. Baldini

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara

52. Luca Balzani

    TU Dortmund University

    Affiliation as printed

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

53. H. Bao

    University of Chinese Academy of Sciences

    Affiliation as printed

    University of Chinese Academy of Sciences

54. J. Baptista de Souza Leite

    University of Liverpool

    Affiliation as printed

    University of Liverpool

55. C. Barbero Pretel

    Universidade de Santiago de Compostela · Université Paris-Saclay

    Affiliation as printed

    Universidade de Santiago de Compostela

    Université Paris-Saclay

56. M. Barbetti

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    Affiliation as printed

    INFN Sezione di Firenze

57. I. R. Barbosa

    Universidade Federal do Rio de Janeiro · Pontifícia Universidade Católica do Rio de Janeiro

    Affiliation as printed

    Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio)

    Universidade Federal do Rio de Janeiro (UFRJ)

58. Roger John Barlow

    University of Manchester

    Affiliation as printed

    University of Manchester

59. Mikhail Barnyakov

    Istituto Nazionale di Fisica Nucleare, Sezione di Bologna

    Affiliation as printed

    INFN Sezione di Bologna

60. S. Barsuk

    Université Paris-Saclay

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    Université Paris-Saclay

61. W. Barter

    University of Edinburgh

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    University of Edinburgh

62. Justin Bartz

    Syracuse University

    Affiliation as printed

    Syracuse University

63. J. M. Basels Aachen

    RWTH Aachen University

    Affiliation as printed

    RWTH Aachen University

64. Saliha Bashir

    AGH University of Krakow

    Affiliation as printed

    AGH—University of Krakow

65. G. Bassi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

    Affiliation as printed

    INFN Sezione di Pisa

66. B. Batsukh

    Institute of High Energy Physics

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    Institute of High Energy Physics (IHEP)

67. Piera Battista

    Université Paris-Saclay

    Affiliation as printed

    Université Paris-Saclay

68. A. Bay

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Ecole Polytechnique Fédérale de Lausanne (EPFL)

69. A. Beck

    Massachusetts Institute of Technology

    Affiliation as printed

    Massachusetts Institute of Technology

70. M. Becker

    TU Dortmund University

    Affiliation as printed

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

71. F. Bedeschi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

    Affiliation as printed

    INFN Sezione di Pisa

72. I. Bediaga

    Centro Brasileiro de Pesquisas Físicas

    Affiliation as printed

    Centro Brasileiro de Pesquisas Físicas (CBPF)

73. Noah Albin Behling

    TU Dortmund University

    Affiliation as printed

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

74. S. Belin

    Universidade de Santiago de Compostela

    Affiliation as printed

    Universidade de Santiago de Compostela

75. K. Belous

    European Organization for Nuclear Research

    Affiliation as printed

    CERN

76. I. Belov

    Istituto Nazionale di Fisica Nucleare, Sezione di Genova

    Affiliation as printed

    INFN Sezione di Genova

77. I. Belyaev

    Istituto Nazionale di Fisica Nucleare, Sezione di Roma I

    Affiliation as printed

    INFN Sezione di Roma La Sapienza

78. G. Benane

    Aix-Marseille Université

    Affiliation as printed

    Aix Marseille Univ

79. G. Bencivenni

    Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

    Affiliation as printed

    INFN Laboratori Nazionali di Frascati

80. E. Ben-Haim

    Sorbonne Université

    Affiliation as printed

    Sorbonne Université

81. Alexander Berezhnoy

    European Organization for Nuclear Research

    Affiliation as printed

    CERN

82. R. Bernet

    University of Zurich

    Affiliation as printed

    Universität Zürich

83. Sergi Bernet Andrés

    Universitat Ramon Llull

    Affiliation as printed

    Universitat Ramon Llull

84. A. Bertolin

    Istituto Nazionale di Fisica Nucleare, Sezione di Padova

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    INFN Sezione di Padova

85. C. Betancourt

    University of Zurich

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    Universität Zürich

86. F. Betti

    University of Edinburgh

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    University of Edinburgh

87. J. Bex

    University of Cambridge

    Affiliation as printed

    University of Cambridge

88. Ia. Bezshyiko

    University of Zurich

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    Universität Zürich

89. J. Bhom

    Institute of Nuclear Physics, Polish Academy of Sciences

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    Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences

90. M. S. Bieker

    TU Dortmund University

    Affiliation as printed

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

91. N. V. Biesuz

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara

92. P. Billoir

    Sorbonne Université

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    Sorbonne Université

93. Alice Biolchini

    National Institute for Subatomic Physics

    Affiliation as printed

    Nikhef National Institute for Subatomic Physics

94. M. Birch

    Imperial College London

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    Imperial College London

95. F. C. R. Bishop

    Université Savoie Mont Blanc

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    Université Savoie Mont Blanc

96. A. Bitadze

    University of Manchester

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    University of Manchester

97. A. Bizzeti
98. Thomas Blake

    University of Warwick

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    University of Warwick

99. F. Blanc

    École Polytechnique Fédérale de Lausanne

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    Ecole Polytechnique Fédérale de Lausanne (EPFL)

100. J. E. Blank

     TU Dortmund University

     Affiliation as printed

     Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany