Study of the B−→Λc+Λ¯c−K− decay

Physical review. D/Physical review. D., vol. 108

Abstract

The decay ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}{K}^{\ensuremath{-}}$ is studied in proton-proton collisions at a center-of-mass energy of $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$ using data corresponding to an integrated luminosity of $5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by the LHCb experiment. In the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{K}^{\ensuremath{-}}$ system, the ${\mathrm{\ensuremath{\Xi}}}_{c}(2930{)}^{0}$ state observed at the BABAR and Belle experiments is resolved into two narrower states, ${\mathrm{\ensuremath{\Xi}}}_{c}(2923{)}^{0}$ and ${\mathrm{\ensuremath{\Xi}}}_{c}(2939{)}^{0}$, whose masses and widths are measured to be $m({\mathrm{\ensuremath{\Xi}}}_{c}(2923{)}^{0})=2924.5\ifmmode\pm\else\textpm\fi{}0.4\ifmmode\pm\else\textpm\fi{}1.1\text{ }\text{ }\mathrm{MeV}$, $m({\mathrm{\ensuremath{\Xi}}}_{c}(2939{)}^{0})=2938.5\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}2.3\text{ }\text{ }\mathrm{MeV}$, $\mathrm{\ensuremath{\Gamma}}({\mathrm{\ensuremath{\Xi}}}_{c}(2923{)}^{0})=\phantom{\rule{0ex}{0ex}}4.8\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}1.5\text{ }\text{ }\mathrm{MeV}$, $\mathrm{\ensuremath{\Gamma}}({\mathrm{\ensuremath{\Xi}}}_{c}(2939{)}^{0})=11.0\ifmmode\pm\else\textpm\fi{}1.9\ifmmode\pm\else\textpm\fi{}7.5\text{ }\text{ }\mathrm{MeV}$, where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{K}^{\ensuremath{-}}$ sample. Evidence of a new ${\mathrm{\ensuremath{\Xi}}}_{c}(2880{)}^{0}$ state is found with a local significance of $3.8\ensuremath{\sigma}$, whose mass and width are measured to be $2881.8\ifmmode\pm\else\textpm\fi{}3.1\ifmmode\pm\else\textpm\fi{}8.5\text{ }\text{ }\mathrm{MeV}$ and $12.4\ifmmode\pm\else\textpm\fi{}5.3\ifmmode\pm\else\textpm\fi{}5.8\text{ }\text{ }\mathrm{MeV}$, respectively. In addition, evidence of a new decay mode ${\mathrm{\ensuremath{\Xi}}}_{c}(2790{)}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{K}^{\ensuremath{-}}$ is found with a significance of $3.7\ensuremath{\sigma}$. The relative branching fraction of ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}{K}^{\ensuremath{-}}$ with respect to the ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{+}{D}^{\ensuremath{-}}{K}^{\ensuremath{-}}$ decay is measured to be $2.36\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.22\ifmmode\pm\else\textpm\fi{}0.25$, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.

Authors 99

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, United Kingdom

3. C. Abellán Beteta

   University of Zurich

   Affiliation as printed

   Physik-Institut, Universität Zürich, Zürich, Switzerland

4. F. Abudinén

   University of Warwick

   Affiliation as printed

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

5. T. Ackernley

   University of Liverpool

   Affiliation as printed

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

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, United Kingdom

8. P. Adlarson

   Uppsala University · University of Glasgow

   Affiliation as printed

   Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)

9. C. Agapopoulou

   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. 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)

11. S. Aiola

    Istituto Nazionale di Fisica Nucleare, Sezione di Milano

    Affiliation as printed

    INFN Sezione di Milano, Milano, Italy

12. 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

13. S. Akar

    University of Cincinnati

    Affiliation as printed

    University of Cincinnati, Cincinnati, Ohio, USA

14. K. Carvalho Akiba

    National Institute for Subatomic Physics

    Affiliation as printed

    Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

15. J. Albrecht

    TU Dortmund University

    Affiliation as printed

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

16. F. Alessio

    European Organization for Nuclear Research

    Affiliation as printed

    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, United Kingdom

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, United Kingdom

20. P. Álvarez Cartelle

    University of Cambridge

    Affiliation as printed

    Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

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, Paris, France

22. S. Amato

    Universidade Federal do Rio de Janeiro

    Affiliation as printed

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

23. J. L. Amey

    University of Bristol

    Affiliation as printed

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

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), Geneva, Switzerland

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

25. Liupan An

    TU Dortmund University · European Organization for Nuclear Research

    Affiliation as printed

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

    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

26. L. Anderlini

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    Affiliation as printed

    INFN Sezione di Firenze, Firenze, Italy

27. M. Andersson

    University of Zurich

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    Physik-Institut, Universität Zürich, Zürich, Switzerland

28. A. Andreianov
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    Affiliated with an institute covered by a cooperation agreement with CERN

29. M. Andreotti

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

30. D. Andreou

    Syracuse University

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    Syracuse University, Syracuse, New York, USA

31. D. Ao

    University of Chinese Academy of Sciences

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    University of Chinese Academy of Sciences, Beijing, China

32. F. Archilli

    Heidelberg University

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

33. A. Artamonov
    Affiliation as printed

    Affiliated with an institute covered by a cooperation agreement with CERN

34. M. Artuso

    Syracuse University

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    Syracuse University, Syracuse, New York, USA

35. 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

36. M. Atzeni

    University of Zurich

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    Physik-Institut, Universität Zürich, Zürich, Switzerland

37. 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

38. S. Bachmann

    Heidelberg University

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

39. Marie Bachmayer

    École Polytechnique Fédérale de Lausanne

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

40. John J Back

    University of Warwick

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

41. A. Bailly-reyre

    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

42. 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

43. 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

44. W. Baldini

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara, Ferrara, Italy

45. J. Baptista de Souza Leite

    Centro Brasileiro de Pesquisas Físicas

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

46. M. Barbetti

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

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    INFN Sezione di Firenze, Firenze, Italy

47. Roger John Barlow

    University of Manchester

    Affiliation as printed

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

48. 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, Orsay, France

49. W. Barter

    Imperial College London

    Affiliation as printed

    Imperial College London, London, United Kingdom

50. M. Bartolini

    University of Cambridge

    Affiliation as printed

    Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

51. F. Baryshnikov
    Affiliation as printed

    Affiliated with an institute covered by a cooperation agreement with CERN

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

    RWTH Aachen University

    Affiliation as printed

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

53. G. Bassi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

    Affiliation as printed

    INFN Sezione di Pisa, Pisa, Italy

54. B. Batsukh

    Institute of High Energy Physics

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

55. A. Battig

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

56. A. Bay

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

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

57. A. Beck

    University of Warwick

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

58. M. Becker

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

59. F. Bedeschi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

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    INFN Sezione di Pisa, Pisa, Italy

60. I. Bediaga

    Centro Brasileiro de Pesquisas Físicas

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

61. A. Beiter

    Syracuse University

    Affiliation as printed

    Syracuse University, Syracuse, New York, USA

62. V. Belavin
    Affiliation as printed

    Affiliated with an institute covered by a cooperation agreement with CERN

63. S. Belin

    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

64. V. Bellée

    University of Zurich

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    Physik-Institut, Universität Zürich, Zürich, Switzerland

65. K. Belous
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    Affiliated with an institute covered by a cooperation agreement with CERN

66. I. Belov
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    Affiliated with an institute covered by a cooperation agreement with CERN

67. I. Belyaev
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    Affiliated with an institute covered by a cooperation agreement with CERN

68. 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 Université, CNRS/IN2P3, CPPM, Marseille, France

69. 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

70. 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

71. Alexander Berezhnoy
    Affiliation as printed

    Affiliated with an institute covered by a cooperation agreement with CERN

72. R. Bernet

    University of Zurich

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    Physik-Institut, Universität Zürich, Zürich, Switzerland

73. Sergi Bernet Andrés

    Universitat Ramon Llull · Universitat de Barcelona

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    DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain (associated with ICCUB, Universitat de Barcelona, Barcelona, Spain)

74. D. Berninghoff

    Heidelberg University

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

75. H. C. Bernstein

    Syracuse University

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    Syracuse University, Syracuse, New York, USA

76. C. Bertella

    University of Manchester

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

77. 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, Padova, Italy

78. C. Betancourt

    University of Zurich

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    Physik-Institut, Universität Zürich, Zürich, Switzerland

79. F. Betti

    European Organization for Nuclear Research

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

80. Ia. Bezshyiko

    University of Zurich

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    Physik-Institut, Universität Zürich, Zürich, Switzerland

81. S. Bhasin

    University of Bristol

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

82. 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

83. L. Bian

    Wuhan University · Tsinghua University

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    School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)

84. M. S. Bieker

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

85. N. V. Biesuz

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

86. S. Bifani

    University of Birmingham

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    University of Birmingham, Birmingham, United Kingdom

87. 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

88. Alice Biolchini

    National Institute for Subatomic Physics

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    Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

89. M. Birch

    Imperial College London

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    Imperial College London, London, United Kingdom

90. F. C. R. Bishop

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

91. A. Bitadze

    University of Manchester

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

92. A. Bizzeti

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

93. Michele Piero Blago

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

94. Thomas Blake

    University of Warwick

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

95. F. Blanc

    École Polytechnique Fédérale de Lausanne

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

96. J. E. Blank

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

97. Steven Roy Blusk

    Syracuse University

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    Syracuse University, Syracuse, New York, USA

98. D. Bobulska

    University of Glasgow

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

99. J. A. Boelhauve

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany