Charmonium production in pNe collisions at $$\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5$$ GeV

The European Physical Journal C, vol. 83

Abstract

Abstract The measurement of charmonium states produced in proton-neon ( $$p\text {Ne}$$ p Ne ) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ and $$\psi {(2S)}$$ ψ ( 2 S ) mesons is studied with a beam of 2.5 $$\mathrm{\,Te\hspace{-1.00006pt}V}$$ Te V protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy $$\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5\mathrm{\,Ge\hspace{-1.00006pt}V} $$ s NN = 68.5 Ge V . The data sample corresponds to an integrated luminosity of $$21.7\pm 1.4 $$ 21.7 ± 1.4 nb $$^{-1}$$ - 1 . The $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ and $$\psi {(2S)}$$ ψ ( 2 S ) hadrons are reconstructed in $$\mu ^+$$ μ + $$\mu ^-$$ μ - final states. The $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ production cross-section per target nucleon in the centre-of-mass rapidity range $$y^\star \in [-2.29, 0]$$ y ⋆ ∈ [ - 2.29 , 0 ] is found to be $$506 \pm 8 \pm 46 \text { nb/nucleon}$$ 506 ± 8 ± 46 nb/nucleon . The ratio of $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ and $$D^0$$ D 0 cross-sections is evaluated to $$(1.06 \pm 0.02 \pm 0.09)\%$$ ( 1.06 ± 0.02 ± 0.09 ) % . The $$\psi {(2S)}$$ ψ ( 2 S ) to $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$

Authors 99

1. R. Aaij

   National Institute for Subatomic Physics

   Affiliation as printed

   Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands

2. A. S. W. Abdelmotteleb

   University of Warwick

   Affiliation as printed

   Department of Physics, University of Warwick, Coventry, UK

3. C. 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. 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

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

9. C. Aidala

   University of Michigan

   Affiliation as printed

   University of Michigan, Ann Arbor, MI, USA

10. S. Aiola

    Istituto Nazionale di Fisica Nucleare, Sezione di Milano · Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca

    Affiliation as printed

    INFN Sezione di Milano, Milan, Italy

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

    Affiliation as printed

    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, The Netherlands

14. J. Albrecht

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

15. F. Alessio

    European Organization for Nuclear Research

    Affiliation as printed

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

16. Michael Thomas Alexander

    University of Glasgow

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

17. A. Alfonso Albero

    Institut de Ciències del Cosmos · Universitat de Barcelona

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    ICCUB, Universitat de Barcelona, Barcelona, Spain

18. Zakariya Aliouche

    University of Manchester

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

19. P. Álvarez Cartelle

    University of Cambridge

    Affiliation as printed

    Cavendish Laboratory, University of Cambridge, Cambridge, UK

20. 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

    Affiliation as printed

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

21. S. Amato

    Universidade Federal do Rio de Janeiro

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

22. J. L. Amey

    University of Bristol

    Affiliation as printed

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

23. 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

    Affiliation as printed

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

24. Liupan An

    Tsinghua University

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    Center for High Energy Physics, Tsinghua University, Beijing, China

25. L. Anderlini

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

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    INFN Sezione di Firenze, Firenze, Italy

26. M. Andersson

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

27. A. Andreianov

    European Organization for Nuclear Research

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

28. M. Andreotti

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

29. D. Andreou

    Syracuse University

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    Syracuse University, Syracuse, NY, USA

30. D. Ao

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

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

    University of Chinese Academy of Sciences, Beijing, China

31. F. Archilli

    Heidelberg University

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

32. A. Artamonov

    European Organization for Nuclear Research

    Affiliation as printed

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

33. M. Artuso

    Syracuse University

    Affiliation as printed

    Syracuse University, Syracuse, NY, USA

34. 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

35. M. Atzeni

    University of Zurich

    Affiliation as printed

    Physik-Institut, Universität Zürich, Zurich, Switzerland

36. 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

37. S. Bachmann

    Heidelberg University

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

38. Marie Bachmayer

    École Polytechnique Fédérale de Lausanne

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

39. John J Back

    University of Warwick

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    Department of Physics, University of Warwick, Coventry, UK

40. A. Bailly-reyre

    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

41. 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

42. 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

43. W. Baldini

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

44. J. Baptista de Souza Leite

    Centro Brasileiro de Pesquisas Físicas

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

45. M. Barbetti

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    Affiliation as printed

    INFN Sezione di Firenze, Firenze, Italy

46. Roger John Barlow

    University of Manchester

    Affiliation as printed

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

47. 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

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

48. W. Barter

    Imperial College London

    Affiliation as printed

    Imperial College London, London, UK

49. M. Bartolini

    University of Cambridge

    Affiliation as printed

    Cavendish Laboratory, University of Cambridge, Cambridge, UK

50. F. Baryshnikov

    European Organization for Nuclear Research

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

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

    RWTH Aachen University

    Affiliation as printed

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

52. G. Bassi

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

    Affiliation as printed

    INFN Sezione di Pisa, Pisa, Italy

    Scuola Normale Superiore, Pisa, Italy

53. B. Batsukh

    Institute of High Energy Physics

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

54. A. Battig

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

55. A. Bay

    European Organization for Nuclear Research

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

56. A. Beck

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

57. M. Becker

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

58. F. Bedeschi

    Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

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    INFN Sezione di Pisa, Pisa, Italy

59. I. Bediaga

    Centro Brasileiro de Pesquisas Físicas

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

60. A. Beiter

    Syracuse University

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    Syracuse University, Syracuse, NY, USA

61. V. Belavin

    European Organization for Nuclear Research

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

62. 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

63. V. Bellée

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

64. K. Belous

    European Organization for Nuclear Research

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

65. I. Belov

    European Organization for Nuclear Research

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

66. I. Belyaev

    European Organization for Nuclear Research

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

67. 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

68. 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

69. 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

70. Alexander Berezhnoy

    European Organization for Nuclear Research

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

71. R. Bernet

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

72. D. Berninghoff

    Heidelberg University

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

73. H. C. Bernstein

    Syracuse University

    Affiliation as printed

    Syracuse University, Syracuse, NY, USA

74. C. Bertella

    University of Manchester

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

75. 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

76. C. Betancourt

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

77. F. Betti

    European Organization for Nuclear Research

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

78. Ia. Bezshyiko

    University of Zurich

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    Physik-Institut, Universität Zürich, Zurich, Switzerland

79. S. Bhasin

    University of Bristol

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

80. 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

81. L. Bian

    Wuhan University

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    School of Physics and Technology, Wuhan University, Wuhan, China

82. M. S. Bieker

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

83. N. V. Biesuz

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

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    INFN Sezione di Ferrara, Ferrara, Italy

84. S. Bifani

    University of Birmingham

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    University of Birmingham, Birmingham, UK

85. 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

86. Alice Biolchini

    National Institute for Subatomic Physics

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    Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands

87. M. Birch

    Imperial College London

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    Imperial College London, London, UK

88. F. C. R. Bishop

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, UK

89. A. Bitadze

    University of Manchester

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

90. A. Bizzeti
91. Michele Piero Blago

    University of Cambridge

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    Cavendish Laboratory, University of Cambridge, Cambridge, UK

92. Thomas Blake

    University of Warwick

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    Department of Physics, University of Warwick, Coventry, UK

93. F. Blanc

    École Polytechnique Fédérale de Lausanne

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

94. Steven Roy Blusk

    Syracuse University

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    Syracuse University, Syracuse, NY, USA

95. D. Bobulska

    University of Glasgow

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

96. J. A. Boelhauve

    TU Dortmund University

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    Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany

97. O. Boente García

    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

98. T. Boettcher

    University of Cincinnati

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    University of Cincinnati, Cincinnati, OH, USA

99. A. S. Boldyrev

    European Organization for Nuclear Research

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