Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at s = 13 TeV

Physics Letters B, vol. 819, pp. 136446

Abstract

A search for leptoquarks produced singly and in pairs in proton-proton collisions is presented. We consider the leptoquark (LQ) to be a scalar particle of charge −1/3 e coupling to a top quark plus a tau lepton ( t τ ) or a bottom quark plus a neutrino ( b ν ), or a vector particle of charge +2/3 e , coupling to t ν or b τ . These choices are motivated by models that can explain a series of anomalies observed in the measurement of B meson decays. In this analysis the signatures t τ ν b and t τ ν are probed, using data recorded by the CMS experiment at the CERN LHC at s = 13 TeV and that correspond to an integrated luminosity of 137 fb −1 . These signatures have not been previously explored in a dedicated search. The data are found to be in agreement with the standard model prediction. Lower limits at 95% confidence level are set on the LQ mass in the range 0.98–1.73 TeV, depending on the LQ spin and its coupling λ to a lepton and a quark, and assuming equal couplings for the two LQ decay modes considered. These are the most stringent constraints to date on the existence of leptoquarks in this scenario.

Authors 100

1. A. M. Sirunyan

   A. Alikhanyan National Laboratory

   Affiliation as printed

   Yerevan Physics Institute, Yerevan, Armenia

2. A. Tumasyan

   A. Alikhanyan National Laboratory

   Affiliation as printed

   Yerevan Physics Institute, Yerevan, Armenia

3. W. Adam

   Institute of High Energy Physics

   Affiliation as printed

   Institut für Hochenergiephysik, Wien, Austria

4. T. Bergauer

   Institute of High Energy Physics

   Affiliation as printed

   Institut für Hochenergiephysik, Wien, Austria

5. M. Dragicevic

   Institute of High Energy Physics

   Affiliation as printed

   Institut für Hochenergiephysik, Wien, Austria

6. J. Erö

   Institute of High Energy Physics

   Affiliation as printed

   Institut für Hochenergiephysik, Wien, Austria

7. A. Escalante Del Valle

   Institute of High Energy Physics

   Affiliation as printed

   Institut für Hochenergiephysik, Wien, Austria

8. Rudolf Konrad Fruhwirth

   Institute of High Energy Physics

   Affiliation as printed

   Institut für Hochenergiephysik, Wien, Austria

9. M. Jeitler

   Institute of High Energy Physics

   Affiliation as printed

   Institut für Hochenergiephysik, Wien, Austria

10. Natascha Krammer

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

11. L. Lechner

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

12. D. Liko

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

13. I. Mikulec

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

14. F. M. Pitters

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

15. Navid K. Rad

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

16. J. Schieck

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

17. R. Schöfbeck

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

18. M. Spanring

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

19. S. Templ

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

20. W. Waltenberger

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik, Wien, Austria

21. C.-E. Wulz

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik , Wien , Austria

    Institut für Hochenergiephysik, Wien, Austria

22. M. Zarucki

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik , Wien , Austria

    Institut für Hochenergiephysik, Wien, Austria

23. V. Chekhovsky

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik , Wien , Austria

    Institute for Nuclear Problems, Minsk, Belarus

24. A. Litomin

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik , Wien , Austria

25. В. Макаренко

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik , Wien , Austria

    Institute for Nuclear Problems, Minsk, Belarus

26. J. Suarez Gonzalez

    Institute of High Energy Physics

    Affiliation as printed

    Institut für Hochenergiephysik , Wien , Austria

    Institute for Nuclear Problems, Minsk, Belarus

27. M. R. Darwish

    University of Antwerp

    Affiliation as printed

    Institute for Nuclear Problems , Minsk , Belarus

    Universiteit Antwerpen, Antwerpen, Belgium

28. E. A. De Wolf

    University of Antwerp

    Affiliation as printed

    Institute for Nuclear Problems , Minsk , Belarus

    Universiteit Antwerpen, Antwerpen, Belgium

29. D. Di Croce

    University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen, Antwerpen, Belgium

30. X. Janssen

    University of Antwerp

    Affiliation as printed

    Institute for Nuclear Problems , Minsk , Belarus

    Universiteit Antwerpen, Antwerpen, Belgium

31. T. Kello

    University of Antwerp · Fudan University

    Affiliation as printed

    Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University , Shanghai , China

    Universiteit Antwerpen, Antwerpen, Belgium

32. A. Lelek

    University of Antwerp

    Affiliation as printed

    Institute for Nuclear Problems , Minsk , Belarus

    Universiteit Antwerpen, Antwerpen, Belgium

33. M. Pieters

    University of Antwerp

    Affiliation as printed

    Institute for Nuclear Problems , Minsk , Belarus

    Universiteit Antwerpen, Antwerpen, Belgium

34. H. Rejeb Sfar

    University of Antwerp

    Affiliation as printed

    Institute for Nuclear Problems , Minsk , Belarus

    Universiteit Antwerpen, Antwerpen, Belgium

35. H. Van Haevermaet

    University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Universiteit Antwerpen, Antwerpen, Belgium

36. P. Van Mechelen

    University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Universiteit Antwerpen, Antwerpen, Belgium

37. Senne Van Putte

    University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Universiteit Antwerpen, Antwerpen, Belgium

38. N. Van Remortel

    University of Antwerp

    Affiliation as printed

    Institute for Nuclear Problems , Minsk , Belarus

    Universiteit Antwerpen, Antwerpen, Belgium

39. F. Blekman

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

40. E. S. Bols

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

41. S. S. Chhibra

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

42. J. D’Hondt

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

43. J. De Clercq

    University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Universiteit Antwerpen, Antwerpen, Belgium

44. D. Lontkovskyi

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

45. S. Lowette

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

46. I. Marchesini

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

47. S. Moortgat

    Vrije Universiteit Brussel

    Affiliation as printed

    Vrije Universiteit Brussel , Brussel , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

48. A. Morton

    Vrije Universiteit Brussel

    Affiliation as printed

    Vrije Universiteit Brussel , Brussel , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

49. D. Müller

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

50. Q. Python

    University of Antwerp · Beihang University

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Beihang University, Beijing, China

51. S. Tavernier

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

52. W. Van Doninck

    Vrije Universiteit Brussel · University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen , Antwerpen , Belgium

    Vrije Universiteit Brussel, Brussel, Belgium

53. P. Van Mulders

    University of Antwerp

    Affiliation as printed

    Universiteit Antwerpen, Antwerpen, Belgium

54. D. Beghin

    Université Libre de Bruxelles · Vrije Universiteit Brussel

    Affiliation as printed

    Vrije Universiteit Brussel , Brussel , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

55. B. Bilin

    Université Libre de Bruxelles · Vrije Universiteit Brussel

    Affiliation as printed

    Vrije Universiteit Brussel , Brussel , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

56. B. Clerbaux

    Université Libre de Bruxelles · Vrije Universiteit Brussel

    Affiliation as printed

    Vrije Universiteit Brussel , Brussel , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

57. G. De Lentdecker

    Université Libre de Bruxelles · Vrije Universiteit Brussel

    Affiliation as printed

    Vrije Universiteit Brussel , Brussel , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

58. B. Dorney

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

59. L. Favart

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

60. A. Grebenyuk

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

61. A. K. Kalsi

    Université Libre de Bruxelles · UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

62. Inna Makarenko

    Université Libre de Bruxelles · Vrije Universiteit Brussel

    Affiliation as printed

    Vrije Universiteit Brussel , Brussel , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

63. L. Moureaux

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

64. L. Pétré

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

65. A. Popov

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

66. N. Postiau

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

67. Elizabeth Rose Starling

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

68. Laurent Thomas

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

69. Catherine Vander Velde

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles, Bruxelles, Belgium

70. Pascal Vanlaer

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

71. David Vannerom

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

72. Liam Wezenbeek

    Université Libre de Bruxelles

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

73. T. Cornelis

    Ghent University

    Affiliation as printed

    Ghent University , Ghent , Belgium

    Ghent University, Ghent, Belgium

74. D. Dobur

    Université Libre de Bruxelles · Ghent University

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Ghent University, Ghent, Belgium

75. M. Gruchala

    Université Libre de Bruxelles · Ghent University

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Ghent University, Ghent, Belgium

76. I. Khvastunov

    Université Libre de Bruxelles · Ghent University

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Ghent University, Ghent, Belgium

77. M. Niedziela

    Ghent University · UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Ghent University, Ghent, Belgium

78. C. Roskas

    Ghent University · UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Ghent University, Ghent, Belgium

79. K. Skovpen

    Ghent University · UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Ghent University, Ghent, Belgium

80. M. Tytgat

    Ghent University · UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Ghent University, Ghent, Belgium

81. W. Verbeke

    Université Libre de Bruxelles · Ghent University

    Affiliation as printed

    Ghent University , Ghent , Belgium

    Université Libre de Bruxelles, Bruxelles, Belgium

82. B. Vermassen

    Université Libre de Bruxelles · Ghent University

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Ghent University, Ghent, Belgium

83. M. Vit

    Université Libre de Bruxelles · Ghent University

    Affiliation as printed

    Université Libre de Bruxelles , Bruxelles , Belgium

    Ghent University, Ghent, Belgium

84. G. Bruno

    Ghent University · UCLouvain

    Affiliation as printed

    Ghent University , Ghent , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

85. F. Bury

    Ghent University · UCLouvain

    Affiliation as printed

    Ghent University , Ghent , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

86. C. Caputo

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

87. P. David

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

88. Christophe Delaere

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

89. M. Delcourt

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

90. I. S. Donertas

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

91. ANDREA GIAMMANCO

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

92. V. Lemaitre

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

93. Krishnapada Mondal

    Ghent University · UCLouvain

    Affiliation as printed

    Ghent University , Ghent , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

94. J. Prisciandaro

    Ghent University · UCLouvain

    Affiliation as printed

    Ghent University , Ghent , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

95. Angela Taliercio

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

96. M. Teklishyn

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

97. P. Vischia

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

98. S. Wertz

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

99. S. Wuyckens

    UCLouvain

    Affiliation as printed

    Université Catholique de Louvain , Louvain-la-Neuve , Belgium

    Université Catholique de Louvain, Louvain-la-Neuve, Belgium

100. Gilvan Augusto Alves

     Ghent University · Centro Brasileiro de Pesquisas Físicas

     Affiliation as printed

     Ghent University , Ghent , Belgium

     Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil