4.7 Article

Measurement of the Lambda(b) polarization and angular parameters in Lambda(b) -> J/psi Lambda decays from pp collisions at root s=7 and 8 TeV

Journal

PHYSICAL REVIEW D
Volume 97, Issue 7, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.97.072010

Keywords

-

Funding

  1. BMWFW (Austria)
  2. FWF (Austria)
  3. FNRS (Belgium)
  4. FWO (Belgium)
  5. CNPq (Brazil)
  6. CAPES (Brazil)
  7. FAPERJ (Brazil)
  8. FAPESP (Brazil)
  9. MES (Bulgaria)
  10. CERN
  11. CAS (China)
  12. MoST (China)
  13. NSFC (China)
  14. COLCIENCIAS (Colombia)
  15. MSES (Croatia)
  16. CSF (Croatia)
  17. RPF (Cyprus)
  18. SENESCYT (Ecuador)
  19. MoER (Estonia)
  20. ERC IUT (Estonia)
  21. ERDF (Estonia)
  22. Academy of Finland (Finland)
  23. MEC (Finland)
  24. HIP (Finland)
  25. CEA (France)
  26. CNRS/IN2P3 (France)
  27. BMBF (Germany)
  28. DFG (Germany)
  29. HGF (Germany)
  30. GSRT (Greece)
  31. OTKA (Hungary)
  32. NIH (Hungary)
  33. DAE (India)
  34. DST (India)
  35. IPM (Iran)
  36. SFI (Ireland)
  37. INFN (Italy)
  38. MSIP (Republic of Korea)
  39. NRF (Republic of Korea)
  40. LAS (Lithuania)
  41. MOE (Malaysia)
  42. UM (Malaysia)
  43. BUAP (Mexico)
  44. CINVESTAV (Mexico)
  45. CONACYT (Mexico)
  46. LNS (Mexico)
  47. SEP (Mexico)
  48. UASLP-FAI (Mexico)
  49. MBIE (New Zealand)
  50. PAEC (Pakistan)
  51. MSHE (Poland)
  52. NSC (Poland)
  53. FCT (Portugal)
  54. JINR (Dubna)
  55. MON (Russia)
  56. RosAtom (Russia)
  57. RAS (Russia)
  58. RFBR (Russia)
  59. RAEP (Russia)
  60. MESTD (Serbia)
  61. SEIDI (Spain)
  62. CPAN (Spain)
  63. PCTI (Spain)
  64. FEDER (Spain)
  65. Swiss Funding Agencies (Switzerland)
  66. MST (Taipei)
  67. ThEPCenter (Thailand)
  68. IPST (Thailand)
  69. STAR (Thailand)
  70. NSTDA (Thailand)
  71. TUBITAK (Turkey)
  72. TAEK (Turkey)
  73. NASU (Ukraine)
  74. SFFR (Ukraine)
  75. STFC (United Kingdom)
  76. DOE (USA)
  77. NSF (USA)
  78. MarieCurie program
  79. European Research Council
  80. European Union [675440]
  81. Leventis Foundation
  82. A. P. Sloan Foundation
  83. Alexander von Humboldt Foundation
  84. Belgian Federal Science Policy Office
  85. Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
  86. Agentschap voor Innovatie door Wetenschap en Technologie (IWTBelgium)
  87. Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
  88. Council of Science and Industrial Research, India
  89. HOMING PLUS program of the Foundation for Polish Science
  90. European Union, Regional Development Fund
  91. Mobility Plus program of the Ministry of Science and Higher Education
  92. National Science Center (Poland) [2014/14/M/ST2/00428, 2014/13/B/ST2/02543, 2014/15/B/ST2/03998, 2015/19/B/ST2/02861, 2012/07/E/ST2/01406]
  93. Qatar National Research Fund
  94. program Severo Ochoa del Principado de Asturias
  95. Thalis program
  96. Aristeia program
  97. EU-ESF
  98. Greek NSRF
  99. Rachadapisek Sompot Fund for Postdoctoral Fellowship
  100. Chulalongkorn University
  101. Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)
  102. Welch Foundation [C-1845]
  103. Weston Havens Foundation (USA)
  104. Direct For Mathematical & Physical Scien [1508869, 1506130] Funding Source: National Science Foundation
  105. Division Of Physics [1506168, 1151640, 1606321] Funding Source: National Science Foundation
  106. STFC [ST/N000242/1] Funding Source: UKRI

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An analysis of the bottom baryon decay Lambda(b) -> J/psi(-> mu(+)mu(-))Lambda( -> p pi(-)) is performed to measure the Lambda(b) polarization and three angular parameters in data from pp collisions at root s = 7 and 8 TeV, collected by the CMS experiment at the Large Hadron Collider. The Lambda(b) polarization is measured to be 0.00 +/- 0.06(stat) +/- 0.06(syst) and the parity-violating asymmetry parameter is determined to be 0.14 +/- 0.14(stat) +/- 0.10(syst). The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics.

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