First observation of the $$ {\Lambda}_b^0 $$ → D+D−Λ decay

Journal of High Energy Physics, vol. 2024

Abstract

A bstract The $$ {\Lambda}_b^0 $$ Λ b 0 → D + D − Λ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5 . 3 fb − 1 . Using the B 0 → $$ {D}^{+}{D}^{-}{K}_S^0 $$ D + D − K S 0 decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be $$ \mathcal{R}=\frac{\sigma_{\Lambda_b^0}}{\sigma_{B^0}}=\frac{\mathcal{B}\left({\Lambda}_b^0\to {D}^{+}{D}^{-}\Lambda \right)}{\mathcal{B}\left({B}^0\to {D}^{+}{D}^{-}{K}_{\textrm{S}}^0\right)}=0.179\pm 0.022\pm 0.014, $$ R = σ Λ b 0 σ B 0 = B Λ b 0 → D + D − Λ B B 0 → D + D − K S 0 = 0.179 ± 0.022 ± 0.014 , where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, $$ \mathcal{B}\left({B}^0\to {D}^{+}{D}^{-}{K}_{\textrm{S}}^0\right) $$ B B 0 → D + D − K S 0 , and the cross-section ratio, $$ {\sigma}_{\Lambda_b^0}/{\sigma}_{B^0} $$ σ Λ b 0 / σ B 0 , previously measured by LHCb are used to derive the branching fraction of the $$ {\Lambda}_b^0 $$

Authors 99

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

   Affiliation as printed

   Uppsala University

10. C. Agapopoulou

    European Organization for Nuclear Research

    Affiliation as printed

    European Organization for Nuclear Research (CERN)

11. C. Aidala

    University of Michigan

    Affiliation as printed

    University of Michigan

12. Ziad 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

    LPC - Laboratoire de Physique de Clermont

13. S. Akar

    University of Cincinnati

    Affiliation as printed

    University of Cincinnati

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

    Technische Universität Dortmund

17. F. Alessio

    European Organization for Nuclear Research

    Affiliation as printed

    European Organization for Nuclear Research (CERN)

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

    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

    LPNHE (UMR_7585) - Laboratoire de Physique Nucléaire et de Hautes Énergies

22. S. Amato

    Universidade Federal do Rio de Janeiro

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    Universidade Federal do Rio de Janeiro (UFRJ)

23. J. L. Amey

    University of Bristol

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    University of Bristol

24. Y. Amhis

    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 · European Organization for Nuclear Research

    Affiliation as printed

    European Organization for Nuclear Research (CERN)

    Université Paris-Saclay, CNRS/IN2P3, IJCLab

    IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

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

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    Universität Zürich

28. A. Andreianov
29. P. Andreola

    University of Zurich

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    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

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    Syracuse University

32. Alessia Anelli

    Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca · University of Milano-Bicocca

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    INFN Sezione di Milano-Bicocca

    Università di Milano Bicocca

33. D. Ao

    University of Chinese Academy of Sciences

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    University of Chinese Academy of Sciences

34. F. Archilli

    University of Rome Tor Vergata · Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata

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    INFN Sezione di Roma Tor Vergata

    Università di Roma Tor Vergata

35. Matteo Argenton

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara

36. S. Arguedas Cuendis

    Consejo Nacional de Rectores

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    Consejo Nacional de Rectores (CONARE)

37. A. Artamonov
38. M. Artuso

    Syracuse University

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    Syracuse University

39. 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 Univ, CNRS/IN2P3, CPPM

    CPPM - Centre de Physique des Particules de Marseille

40. M. Atzeni

    Massachusetts Institute of Technology

    Affiliation as printed

    Massachusetts Institute of Technology

41. B. Audurier

    Centre National de la Recherche Scientifique · École Polytechnique · Institut National de Physique Nucléaire et de Physique des Particules · Institut Polytechnique de Paris · Laboratoire Leprince-Ringuet

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    Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris

    LLR - Laboratoire Leprince-Ringuet

42. D. Bacher

    University of Oxford

    Affiliation as printed

    University of Oxford

43. I. Bachiller

    Centre National de la Recherche Scientifique · Laboratoire d’Annecy de Physique des Particules · Institut National de Physique Nucléaire et de Physique des Particules · Université Savoie Mont Blanc

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    Université Savoie Mont Blanc, CNRS, IN2P3-LAPP

    LAPP - Laboratoire d'Annecy de Physique des Particules

44. S. Bachmann

    Heidelberg University

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    Ruprecht-Karls-Universität Heidelberg

45. Marie Bachmayer

    École Polytechnique Fédérale de Lausanne

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

46. John J Back

    University of Warwick

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    University of Warwick

47. P. Baladrón Rodríguez

    Universidade de Santiago de Compostela

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    Universidade de Santiago de Compostela

48. V. Balagura

    Centre National de la Recherche Scientifique · École Polytechnique · Institut National de Physique Nucléaire et de Physique des Particules · Institut Polytechnique de Paris · Laboratoire Leprince-Ringuet

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    Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris

    LLR - Laboratoire Leprince-Ringuet

49. W. Baldini

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara

50. J. Baptista de Souza Leite

    University of Liverpool

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    University of Liverpool

51. M. Barbetti

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze · University of Florence

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    INFN Sezione di Firenze

    Università di Firenze

52. I. R. Barbosa

    Pontifícia Universidade Católica do Rio de Janeiro

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

53. Roger John Barlow

    University of Manchester

    Affiliation as printed

    University of Manchester

54. S. Barsuk

    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

    Université Paris-Saclay, CNRS/IN2P3, IJCLab

    IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

55. W. Barter

    University of Edinburgh

    Affiliation as printed

    University of Edinburgh

56. M. Bartolini

    University of Cambridge

    Affiliation as printed

    University of Cambridge

57. Justin Bartz

    Syracuse University

    Affiliation as printed

    Syracuse University

58. F. Baryshnikov
59. J. M. Basels Aachen

    RWTH Aachen University

    Affiliation as printed

    RWTH Aachen University

60. G. Bassi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

    Affiliation as printed

    INFN Sezione di Pisa

61. B. Batsukh

    Institute for High Energy Physics · Institute of High Energy Physics

    Affiliation as printed

    Institute Of High Energy Physics (IHEP)

62. A. Battig

    TU Dortmund University

    Affiliation as printed

    Technische Universität Dortmund

63. A. Bay

    École Polytechnique Fédérale de Lausanne

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

64. A. Beck

    University of Warwick

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    University of Warwick

65. M. Becker

    TU Dortmund University

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    Technische Universität Dortmund

66. F. Bedeschi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

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    INFN Sezione di Pisa

67. I. Bediaga

    Centro Brasileiro de Pesquisas Físicas

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    Centro Brasileiro de Pesquisas Físicas (CBPF)

68. A. Beiter

    Syracuse University

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    Syracuse University

69. S. Belin

    Universidade de Santiago de Compostela

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    Universidade de Santiago de Compostela

70. V. Bellée

    University of Zurich

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    Universität Zürich

71. K. Belous
72. I. Belov

    Istituto Nazionale di Fisica Nucleare, Sezione di Genova

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    INFN Sezione di Genova

73. I. Belyaev

    Istituto Nazionale di Fisica Nucleare, Sezione di Roma I

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    INFN Sezione di Roma La Sapienza

74. G. Benane

    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 Univ, CNRS/IN2P3, CPPM

    CPPM - Centre de Physique des Particules de Marseille

75. G. Bencivenni

    Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

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    INFN Laboratori Nazionali di Frascati

76. 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

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

    LPNHE (UMR_7585) - Laboratoire de Physique Nucléaire et de Hautes Énergies

77. Alexander Berezhnoy
78. R. Bernet

    University of Zurich

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    Universität Zürich

79. Sergi Bernet Andrés

    Universitat Ramon Llull

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    DS4DS, La Salle, Universitat Ramon Llull

80. C. Bertella

    University of Manchester

    Affiliation as printed

    University of Manchester

81. A. Bertolin

    University of Padua · Istituto Nazionale di Fisica Nucleare, Sezione di Padova

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    Università degli Studi di Padova, Università e INFN, Padova

82. C. Betancourt

    University of Zurich

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    Universität Zürich

83. F. Betti

    University of Edinburgh

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    University of Edinburgh

84. J. Bex

    University of Cambridge

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    University of Cambridge

85. Ia. Bezshyiko

    University of Zurich

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    Universität Zürich

86. J. Bhom

    Institute of Nuclear Physics, Polish Academy of Sciences

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    Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences

87. M. S. Bieker

    TU Dortmund University

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    Technische Universität Dortmund

88. N. V. Biesuz

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara

89. 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

    LPNHE (UMR_7585) - Laboratoire de Physique Nucléaire et de Hautes Énergies

90. Alice Biolchini

    National Institute for Subatomic Physics

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    Nikhef National Institute for Subatomic Physics

91. M. Birch

    Imperial College London

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    Imperial College London

92. F. C. R. Bishop

    Centre National de la Recherche Scientifique · Laboratoire d’Annecy de Physique des Particules · Institut National de Physique Nucléaire et de Physique des Particules · Université Savoie Mont Blanc

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    Université Savoie Mont Blanc, CNRS, IN2P3-LAPP

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93. A. Bitadze

    University of Manchester

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    University of Manchester

94. A. Bizzeti
95. Thomas Blake

    University of Warwick

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    University of Warwick

96. F. Blanc

    École Polytechnique Fédérale de Lausanne

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

97. J. E. Blank

    TU Dortmund University

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    Technische Universität Dortmund

98. Steven Roy Blusk

    Syracuse University

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    Syracuse University

99. Vladimir Bocharnikov