Observation of $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ decays

The European Physical Journal C, vol. 84

Abstract

Abstract The decays $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ Λ b 0 → Λ c + D ¯ ( ∗ ) 0 K - and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ Λ b 0 → Λ c + D s ∗ - are observed for the first time, in proton-proton collision data at $$\sqrt{s} =13\text {Te\hspace{-1.00006pt}V} $$ s = 13 Te V , corresponding to an integrated luminosity of 5.4 $$\text {fb} ^{-1}$$ fb - 1 collected with the LHCb detector. Their ratios of branching fractions with respect to the $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} $$ Λ b 0 → Λ c + D s - mode are measured to be $$\begin{aligned} \begin{aligned} \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^0} {{K} ^-} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 0.1908 {}_{-0.0034}^{+0.0036} {}_{-0.0018}^{+0.0016} \pm 0.0038,\\ \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{*0}} {{K} ^-} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 0.589 {}_{-0.017}^{+0.018} {}_{-0.018}^{+0.017} \pm 0.012,\\ \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 1.668 \pm 0.022 {}_{-0.055}^{+0.061}, \end{aligned} \end{aligned}$$ B Λ b 0 → Λ c + D ¯ 0 K - B

Authors 100

1. R. Aaij

   National Institute for Subatomic Physics

   Affiliation as printed

   Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

2. A. S. W. Abdelmotteleb

   University of Warwick

   Affiliation as printed

   Department of Physics, University of Warwick, Coventry, UK

3. Carlos Abellán Beteta

   University of Zurich

   Affiliation as printed

   Physik-Institut, Universität Zürich, Zurich, Switzerland

4. F. Abudinén

   University of Warwick

   Affiliation as printed

   Department of Physics, University of Warwick, Coventry, UK

5. T. Ackernley

   University of Liverpool

   Affiliation as printed

   Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK

6. 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

7. M. Adinolfi

   University of Bristol

   Affiliation as printed

   H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK

8. P. Adlarson

   Uppsala University

   Affiliation as printed

   Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden

9. C. Agapopoulou

   European Organization for Nuclear Research

   Affiliation as printed

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

10. C. Aidala

    University of Michigan

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    University of Michigan, Ann Arbor, MI, USA

11. 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

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

12. S. Akar

    University of Cincinnati

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    University of Cincinnati, Cincinnati, OH, USA

13. K. Carvalho Akiba

    National Institute for Subatomic Physics

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    Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

14. P. Albicocco

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

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    INFN Laboratori Nazionali di Frascati, Frascati, Italy

15. J. Albrecht

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

16. F. Alessio

    European Organization for Nuclear Research

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

17. Michael Thomas Alexander

    University of Glasgow

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    School of Physics and Astronomy, University of Glasgow, Glasgow, UK

18. A. Alfonso Albero

    Institut de Ciències del Cosmos · Universitat de Barcelona

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    ICCUB, Universitat de Barcelona, Barcelona, Spain

19. Zakariya Aliouche

    University of Manchester

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    Department of Physics and Astronomy, University of Manchester, Manchester, UK

20. P. Álvarez Cartelle

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, UK

21. R. Amalric

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

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

22. S. Amato

    Universidade Federal do Rio de Janeiro

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

23. J. L. Amey

    University of Bristol

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    H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK

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

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

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

25. Liupan An

    Universidade Federal do Rio de Janeiro · Peking University · State Key Laboratory of Nuclear Physics and Technology

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    School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China

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

26. L. Anderlini

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

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    INFN Sezione di Firenze, Firenze, Italy

27. M. Andersson

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

28. A. Andreianov

    European Organization for Nuclear Research

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    Affiliated with an Institute Covered by a Cooperation Agreement with CERN, Geneva, Switzerland

29. P. Andreola

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

30. M. Andreotti

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

31. D. Andreou

    Syracuse University

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    Syracuse University, Syracuse, NY, USA

32. Alessia Anelli

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

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    INFN Sezione di Milano-Bicocca, Milan, Italy

    Università di Milano Bicocca, Milan, Italy

    INFN Sezione di Genova, Genoa, Italy

    Università di Genova, Genoa, Italy

33. D. Ao

    Institute of High Energy Physics · University of Chinese Academy of Sciences

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    University of Chinese Academy of Sciences, Beijing, China

    Institute Of High Energy Physics (IHEP), Beijing, China

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, Rome, Italy

    Università di Roma Tor Vergata, Rome, Italy

35. Matteo Argenton

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

36. S. Arguedas Cuendis

    Consejo Nacional de Rectores

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    Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica

37. A. Artamonov

    European Organization for Nuclear Research

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    Affiliated with an Institute Covered by a Cooperation Agreement with CERN, Geneva, Switzerland

38. M. Artuso

    Syracuse University

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    Syracuse University, Syracuse, NY, USA

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

40. M. Atzeni

    Massachusetts Institute of Technology

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    Massachusetts Institute of Technology, Cambridge, MA, USA

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, Palaiseau, France

42. D. Bacher

    University of Oxford

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    Department of Physics, University of Oxford, Oxford, UK

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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    CNRS, IN2P3-LAPP, Université Savoie Mont Blanc, Annecy, France

44. S. Bachmann

    Heidelberg University

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

45. Marie Bachmayer

    École Polytechnique Fédérale de Lausanne

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

46. John J Back

    University of Warwick

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    Department of Physics, University of Warwick, Coventry, UK

47. P. Baladrón 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

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, Palaiseau, France

49. W. Baldini

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

50. J. Baptista de Souza Leite

    Centro Brasileiro de Pesquisas Físicas

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

51. M. Barbetti

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

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    INFN Sezione di Firenze, Firenze, Italy

    Università di Firenze, Firenze, Italy

52. I. R. Barbosa

    Pontifícia Universidade Católica do Rio de Janeiro

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

53. Roger John Barlow

    University of Manchester

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    Department of Physics and Astronomy, University of Manchester, Manchester, UK

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

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

55. W. Barter

    University of Edinburgh

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    School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK

56. M. Bartolini

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, UK

57. Justin Bartz

    Syracuse University

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    Syracuse University, Syracuse, NY, USA

58. F. Baryshnikov

    European Organization for Nuclear Research

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    Affiliated with an Institute Covered by a Cooperation Agreement with CERN, Geneva, Switzerland

59. J. M. Basels Aachen I. Physikalisches Institut

    RWTH Aachen University

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

60. G. Bassi

    Scuola Normale Superiore · Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

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    INFN Sezione di Pisa, Pisa, Italy

    Scuola Normale Superiore, Pisa, Italy

61. B. Batsukh

    Institute of High Energy Physics

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    Institute Of High Energy Physics (IHEP), Beijing, China

62. A. Battig

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

63. A. Bay

    École Polytechnique Fédérale de Lausanne

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

64. A. Beck

    TU Dortmund University · University of Warwick

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    Department of Physics, University of Warwick, Coventry, UK

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

65. M. Becker

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

66. F. Bedeschi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

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    INFN Sezione di Pisa, Pisa, Italy

67. I. Bediaga

    Centro Brasileiro de Pesquisas Físicas

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

68. A. Beiter

    Syracuse University

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    Syracuse University, Syracuse, NY, USA

69. S. Belin

    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

70. V. Bellée

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

71. K. Belous

    European Organization for Nuclear Research

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    Affiliated with an Institute Covered by a Cooperation Agreement with CERN, Geneva, Switzerland

72. I. Belov

    Istituto Nazionale di Fisica Nucleare, Sezione di Genova

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    INFN Sezione di Genova, Genoa, Italy

73. I. Belyaev

    European Organization for Nuclear Research

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    Affiliated with an Institute Covered by a Cooperation Agreement with CERN, Geneva, Switzerland

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

75. G. Bencivenni

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

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    INFN Laboratori Nazionali di Frascati, Frascati, Italy

76. E. Ben-Haim

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

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

77. Alexander Berezhnoy

    European Organization for Nuclear Research

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    Affiliated with an Institute Covered by a Cooperation Agreement with CERN, Geneva, Switzerland

78. R. Bernet

    University of Zurich · Universitat Ramon Llull

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

    DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain

79. Sergi Bernet Andrés

    Universitat Ramon Llull

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    DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain

80. H. C. Bernstein

    Syracuse University

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    Syracuse University, Syracuse, NY, USA

81. C. Bertella

    University of Manchester

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    Department of Physics and Astronomy, University of Manchester, Manchester, UK

82. 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, Padua, Italy

83. C. Betancourt

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

84. F. Betti

    University of Edinburgh

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    School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK

85. J. Bex

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, UK

86. Ia. Bezshyiko

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

87. 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

88. M. S. Bieker

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

89. N. V. Biesuz

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

90. P. Billoir

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

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

91. Alice Biolchini

    National Institute for Subatomic Physics

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    Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

92. M. Birch

    Imperial College London

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    Imperial College London, London, UK

93. 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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    CNRS, IN2P3-LAPP, Université Savoie Mont Blanc, Annecy, France

94. A. Bitadze

    University of Manchester

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    Department of Physics and Astronomy, University of Manchester, Manchester, UK

95. A. Bizzeti

    European Organization for Nuclear Research

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    CERN, 1211 Geneva 23, Switzerland

96. Michele Piero Blago

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, UK

97. Thomas Blake

    University of Warwick

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    Department of Physics, University of Warwick, Coventry, UK

98. F. Blanc

    École Polytechnique Fédérale de Lausanne

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

99. J. E. Blank

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

100. Steven Roy Blusk

     Syracuse University

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     Syracuse University, Syracuse, NY, USA