Search for A ′ → μ + μ − Decays

Physical Review Letters, vol. 124, pp. 041801

Abstract

Searches are performed for both promptlike and long-lived dark photons, ${A}^{\ensuremath{'}}$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for ${A}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decays using a data sample corresponding to an integrated luminosity of $5.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the LHCb detector. Neither search finds evidence for a signal, and 90% confidence-level exclusion limits are placed on the $\ensuremath{\gamma}--{A}^{\ensuremath{'}}$ kinetic mixing strength. The promptlike ${A}^{\ensuremath{'}}$ search explores the mass region from near the dimuon threshold up to 70 GeV and places the most stringent constraints to date on dark photons with $214<m({A}^{\ensuremath{'}})\ensuremath{\lesssim}740\text{ }\text{ }\mathrm{MeV}$ and $10.6

Authors 98

1. R. Aaij

   National Institute for Subatomic Physics

   Affiliation as printed

   Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

2. Carlos Abellán Beteta

   University of Zurich

   Affiliation as printed

   Physik-Institut, Universität Zürich, Zürich, Switzerland

3. T. Ackernley

   University of Liverpool

   Affiliation as printed

   Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom

4. B. Adeva

   Universidade de Santiago de Compostela

   Affiliation as printed

   Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain

5. M. Adinolfi

   University of Bristol

   Affiliation as printed

   H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom

6. H. Afsharnia

   Centre National de la Recherche Scientifique · Université Clermont Auvergne · Laboratoire de Physique de Clermont Auvergne · Institut National de Physique Nucléaire et de Physique des Particules

   Affiliation as printed

   Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France

7. C. Aidala

   University of Michigan · Syracuse University

   Affiliation as printed

   University of Michigan, Ann Arbor, Michigan, USA [associated with Syracuse University, Syracuse, New York, USA]

   University of Michigan, Ann Arbor, Michigan, USA [associated with Syracuse University, Syracuse, New York, USA]*

8. S. Aiola

   Istituto Nazionale di Fisica Nucleare, Sezione di Milano

   Affiliation as printed

   INFN Sezione di Milano, Milano, Italy

9. Z. Ajaltouni

   Centre National de la Recherche Scientifique · Université Clermont Auvergne · Laboratoire de Physique de Clermont Auvergne · Institut National de Physique Nucléaire et de Physique des Particules

   Affiliation as printed

   Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France

10. S. Akar

    University of Cincinnati

    Affiliation as printed

    University of Cincinnati, Cincinnati, Ohio, USA

11. P. Albicocco

    Istituto Nazionale di Fisica Nucleare · Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

    Affiliation as printed

    INFN Laboratori Nazionali di Frascati, Frascati, Italy

12. J. Albrecht

    TU Dortmund University

    Affiliation as printed

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

13. F. Alessio

    European Organization for Nuclear Research

    Affiliation as printed

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

14. Michael Thomas Alexander

    University of Glasgow

    Affiliation as printed

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

15. A. Alfonso Albero

    Institut de Ciències del Cosmos · Universitat de Barcelona

    Affiliation as printed

    ICCUB, Universitat de Barcelona, Barcelona, Spain

16. G. Alkhazov

    Kurchatov Institute · Petersburg Nuclear Physics Institute

    Affiliation as printed

    Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia

17. P. Álvarez Cartelle

    Imperial College London

    Affiliation as printed

    Imperial College London, London, United Kingdom

18. Antonio Augusto Alves Junior

    Universidade de Santiago de Compostela

    Affiliation as printed

    Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain

19. S. Amato

    Universidade Federal do Rio de Janeiro

    Affiliation as printed

    Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil

20. Y. Amhis

    Université Paris-Sud · Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France

21. Lingling An

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    Affiliation as printed

    INFN Sezione di Firenze, Firenze, Italy

22. L Anderlini

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    Affiliation as printed

    INFN Sezione di Firenze, Firenze, Italy

23. G. Andreassi

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

24. M. Andreotti

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara, Ferrara, Italy

25. F. Archilli

    Heidelberg University

    Affiliation as printed

    Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

26. J. Arnau Romeu

    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 Université, CNRS/IN2P3, CPPM, Marseille, France

27. A. Artamonov

    Kurchatov Institute · Institute for High Energy Physics

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    Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia

28. M. Artuso

    Syracuse University

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    Syracuse University, Syracuse, New York, USA

29. Kenenbek Arzymatov

    Yandex School of Data Analysis · Yandex (Russia)

    Affiliation as printed

    Yandex School of Data Analysis, Moscow, Russia

30. E. Aslanides

    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

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

31. M. Atzeni

    University of Zurich

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    Physik-Institut, Universität Zürich, Zürich, Switzerland

32. B. Audurier

    Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari

    Affiliation as printed

    INFN Sezione di Cagliari, Monserrato, Italy

33. S. Bachmann

    Heidelberg University

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    Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

34. S. Baker

    Imperial College London

    Affiliation as printed

    Imperial College London, London, United Kingdom

35. V. Balagura

    Université Paris-Sud · Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France

36. W. Baldini

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

    Affiliation as printed

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

    INFN Sezione di Ferrara, Ferrara, Italy

37. A. Baranov

    Yandex School of Data Analysis · Yandex (Russia)

    Affiliation as printed

    Yandex School of Data Analysis, Moscow, Russia

38. Roger John Barlow

    University of Manchester

    Affiliation as printed

    Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom

39. S. Barsuk

    Université Paris-Sud · Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut National de Physique Nucléaire et de Physique des Particules

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    LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France

40. W. Barter

    Imperial College London

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    Imperial College London, London, United Kingdom

41. M. Bartolini

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

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

    INFN Sezione di Genova, Genova, Italy

42. F. Baryshnikov

    National University of Science and Technology · Kurchatov Institute · Institute for Theoretical and Experimental Physics

    Affiliation as printed

    National University of Science and Technology "MISIS," Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia]

43. G. Bassi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

    Affiliation as printed

    INFN Sezione di Pisa, Pisa, Italy

44. V. Batozskaya

    National Centre for Nuclear Research

    Affiliation as printed

    National Center for Nuclear Research (NCBJ), Warsaw, Poland

45. B. Batsukh

    Syracuse University

    Affiliation as printed

    Syracuse University, Syracuse, New York, USA

46. A. Battig

    TU Dortmund University

    Affiliation as printed

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

47. V. Battista

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

48. A. Bay

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

49. F. Bedeschi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

    Affiliation as printed

    INFN Sezione di Pisa, Pisa, Italy

50. I. Bediaga

    Centro Brasileiro de Pesquisas Físicas

    Affiliation as printed

    Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil

51. A. Beiter

    Syracuse University

    Affiliation as printed

    Syracuse University, Syracuse, New York, USA

52. L. J. Bel

    National Institute for Subatomic Physics

    Affiliation as printed

    Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

53. V. Belavin

    Yandex School of Data Analysis · Yandex (Russia)

    Affiliation as printed

    Yandex School of Data Analysis, Moscow, Russia

54. S. Belin

    Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari

    Affiliation as printed

    INFN Sezione di Cagliari, Monserrato, Italy

55. N. Beliy

    University of Chinese Academy of Sciences

    Affiliation as printed

    University of Chinese Academy of Sciences, Beijing, China

56. V. Bellée

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

57. K. Belous

    Kurchatov Institute · Institute for High Energy Physics

    Affiliation as printed

    Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia

58. I. Belyaev

    Kurchatov Institute · Institute for Theoretical and Experimental Physics

    Affiliation as printed

    Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia

59. G. Bencivenni

    Istituto Nazionale di Fisica Nucleare · Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

    Affiliation as printed

    INFN Laboratori Nazionali di Frascati, Frascati, Italy

60. E. Ben-Haim

    Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France

61. S. Benson

    National Institute for Subatomic Physics

    Affiliation as printed

    Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

62. S. Beranek Aachen I. Physikalisches Institut

    RWTH Aachen University

    Affiliation as printed

    I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany

63. Alexander Berezhnoy

    Lomonosov Moscow State University

    Affiliation as printed

    Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia

64. R. Bernet

    University of Zurich

    Affiliation as printed

    Physik-Institut, Universität Zürich, Zürich, Switzerland

65. D. Berninghoff

    Heidelberg University

    Affiliation as printed

    Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

66. H. C. Bernstein

    Syracuse University

    Affiliation as printed

    Syracuse University, Syracuse, New York, USA

67. E. Bertholet

    Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France

68. A. Bertolin

    Istituto Nazionale di Fisica Nucleare, Sezione di Padova

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    INFN Sezione di Padova, Padova, Italy

69. C. Betancourt

    University of Zurich

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    Physik-Institut, Universität Zürich, Zürich, Switzerland

70. F. Betti

    Istituto Nazionale di Fisica Nucleare, Sezione di Bologna

    Affiliation as printed

    INFN Sezione di Bologna, Bologna, Italy

71. M. O. Bettler

    University of Cambridge

    Affiliation as printed

    Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

72. Ia. Bezshyiko

    University of Zurich

    Affiliation as printed

    Physik-Institut, Universität Zürich, Zürich, Switzerland

73. S. Bhasin

    University of Bristol

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    H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom

74. J. Bhom

    Institute of Nuclear Physics, Polish Academy of Sciences

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    Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland

75. M. S. Bieker

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

76. S. Bifani

    University of Birmingham

    Affiliation as printed

    University of Birmingham, Birmingham, United Kingdom

77. P. Billoir

    Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules

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    LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France

78. A. Bizzeti

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

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    INFN Sezione di Firenze, Firenze, Italy

79. M. Bjørn

    University of Oxford

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    Department of Physics, University of Oxford, Oxford, United Kingdom

80. Michele Piero Blago

    European Organization for Nuclear Research

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

81. Thomas Blake

    University of Warwick

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    Department of Physics, University of Warwick, Coventry, United Kingdom

82. F. Blanc

    École Polytechnique Fédérale de Lausanne

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    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

83. Steven Roy Blusk

    Syracuse University

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    Syracuse University, Syracuse, New York, USA

84. D. Bobulska

    University of Glasgow

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

85. V. Bocci

    Istituto Nazionale di Fisica Nucleare, Sezione di Roma I

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    INFN Sezione di Roma La Sapienza, Roma, Italy

86. O. Boente García

    Universidade de Santiago de Compostela

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    Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain

87. T. Boettcher

    Massachusetts Institute of Technology

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    Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

88. A Boldyrev

    National Research University Higher School of Economics · Yandex School of Data Analysis

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    National Research University Higher School of Economics, Moscow, Russia (associated with Yandex School of Data Analysis, Moscow, Russia)

89. A. Bondar

    Siberian Branch of the Russian Academy of Sciences · Budker Institute of Nuclear Physics

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    Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia

90. N. Bondar

    Kurchatov Institute · Petersburg Nuclear Physics Institute

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    Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia

91. S. Borghi

    University of Manchester · European Organization for Nuclear Research

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    Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom

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

92. M. Borisyak

    Yandex School of Data Analysis · Yandex (Russia)

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    Yandex School of Data Analysis, Moscow, Russia

93. M. Borsato

    Heidelberg University

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    Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

94. J. T. Borsuk

    Institute of Nuclear Physics, Polish Academy of Sciences

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    Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland

95. T. J. V. Bowcock

    University of Liverpool

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    Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom

96. C. Bozzi

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

97. S. Braun

    Heidelberg University

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    Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

98. A. Brea Rodríguez

    Universidade de Santiago de Compostela

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    Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain