4.7 Article

Measurement of the CP-violating phase φs in Bs0 → J/ψφ decays in ATLAS at 13 TeV

Journal

EUROPEAN PHYSICAL JOURNAL C
Volume 81, Issue 4, Pages -

Publisher

SPRINGER
DOI: 10.1140/epjc/s10052-021-09011-0

Keywords

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Funding

  1. ANPCyT, Argentina
  2. YerPhI, Armenia
  3. ARC, Australia
  4. BMWFW, Austria
  5. FWF, Austria
  6. ANAS, Azerbaijan
  7. SSTC, Belarus
  8. CNPq, Brazil
  9. FAPESP, Brazil
  10. NSERC, Canada
  11. NRC, Canada
  12. CFI, Canada
  13. CERN
  14. ANID, Chile
  15. CAS, China
  16. MOST, China
  17. NSFC, China
  18. COLCIENCIAS, Colombia
  19. MSMT CR, Czech Republic
  20. MPO CR, Czech Republic
  21. VSC CR, Czech Republic
  22. DNRF, Denmark
  23. DNSRC, Denmark
  24. IN2P3-CNRS, France
  25. CEA-DRF/IRFU, France
  26. SRNSFG, Georgia
  27. BMBF, Germany
  28. HGF, Germany
  29. MPG, Germany
  30. GSRT, Greece
  31. RGC, China
  32. Hong Kong SAR, China
  33. ISF, Israel
  34. Benoziyo Center, Israel
  35. INFN, Italy
  36. MEXT, Japan
  37. JSPS, Japan
  38. CNRST, Morocco
  39. NWO, Netherlands
  40. RCN, Norway
  41. MNiSW, Poland
  42. NCN, Poland
  43. FCT, Portugal
  44. MNE/IFA, Romania
  45. JINR
  46. MES of Russia, Russian Federation
  47. NRC KI, Russian Federation
  48. MESTD, Serbia
  49. MSSR, Slovakia
  50. ARRS, Slovenia
  51. MIZS, Slovenia
  52. DST/NRF, South Africa
  53. MICINN, Spain
  54. SRC, Sweden
  55. Wallenberg Foundation, Sweden
  56. SERI, Switzerland
  57. SNSF, Switzerland
  58. Canton of Bern, Switzerland
  59. Canton of Geneva, Switzerland
  60. MOST, Taiwan
  61. TAEK, Turkey
  62. STFC, United Kingdom
  63. DOE, United States of America
  64. NSF, United States of America
  65. BCKDF, Canada
  66. CANARIE, Canada
  67. Compute Canada, Canada
  68. CRC, Canada
  69. IVADO, Canada
  70. Beijing Municipal ScienceAMP
  71. Technology Commission, China
  72. COST, European Union
  73. ERC, European Union
  74. ERDF, European Union
  75. Horizon 2020, European Union
  76. Investissements d'Avenir Labex, France
  77. Investissements d'Avenir Idex, France
  78. ANR, France
  79. DFG, Germany
  80. AvH Foundation, Germany
  81. Thales programme - EU-ESF, Greece
  82. Aristeia programme - EU-ESF, Greece
  83. Greek NSRF, Greece
  84. BSFNSF, Israel
  85. GIF, Israel
  86. La Caixa Banking Foundation, Spain
  87. CERCA Programme Generalitat de Catalunya, Spain
  88. GenT Programme Generalitat Valenciana, Spain
  89. Goran Gustafssons Stiftelse, Sweden
  90. Royal Society, United Kingdom
  91. Leverhulme Trust, United Kingdom
  92. PROMETEO Programme Generalitat Valenciana, Spain
  93. Herakleitos programme - EU-ESF, Greece
  94. Marie Sklodowska-Curie Actions, European Union
  95. Science and Technology Facilities Council [ST/S000879/1] Funding Source: researchfish

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This study presents the measurement of B-0(s) -> J/psi phi decay parameters using 80.5 fb(-1) of integrated luminosity collected at the LHC, showing results in agreement with the Standard Model predictions.
A measurement of the B-0(s) -> J/psi phi decay parameters using 80.5 fb(-1) of integrated luminosity collected with the ATLAS detector from 13 TeV proton-proton collisions at the LHC is presented. The measured parameters include the CP-violating phase phi(s), the width difference Delta Gamma(s) between the B-s(0) meson mass eigenstates and the average decay width Gamma(s). The values measured for the physical parameters are combined with those from 19.2 fb(-1) of 7 and 8 TeV data, leading to the following: phi(s) = -0.087 +/- 0.036 (stat.) +/- 0.021 (syst.) rad Delta Gamma(s) = 0.0657 +/- 0.0043 (stat.) +/- 0.0037 (syst.) ps(-1) Gamma(s) = 0.6703 +/- 0.0014 (stat.) +/- 0.0018 (syst.) ps(-1) Results for phi(s) and Delta Gamma(s) are also presented as 68% confidence level contours in the phi(s)-Delta Gamma(s) plane. Furthermore the transversity amplitudes and corresponding strong phases are measured. phi(s) and Delta Gamma(s) measurements are in agreement with the Standard Model predictions.

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