4.7 Article

Measurement of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section in pp collisions at √s=7 TeV and first determination of the strong coupling constant in the TeV range

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EUROPEAN PHYSICAL JOURNAL C
卷 73, 期 10, 页码 -

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SPRINGER
DOI: 10.1140/epjc/s10052-013-2604-6

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资金

  1. BMWF (Austria)
  2. FWF (Austria)
  3. FNRS (Belgium)
  4. FWO (Belgium)
  5. CNPq (Brazil)
  6. CAPES (Brazil)
  7. FAPERJ (Brazil)
  8. FAPESP (Brazil)
  9. MEYS (Bulgaria)
  10. CERN
  11. CAS (China)
  12. MoST (China)
  13. NSFC (China)
  14. COLCIENCIAS (Colombia)
  15. MSES (Croatia)
  16. RPF (Cyprus)
  17. MoER (Estonia) [SF0690030s09]
  18. ERDF (Estonia)
  19. Academy of Finland (Finland)
  20. MEC (Finland)
  21. HIP (Finland)
  22. CEA (France)
  23. CNRS/IN2P3 (France)
  24. BMBF (Germany)
  25. DFG (Germany)
  26. HGF (Germany)
  27. GSRT (Greece)
  28. OTKA (Hungary)
  29. NKTH (Hungary)
  30. DAE (India)
  31. DST (India)
  32. IPM (Iran)
  33. SFI (Ireland)
  34. INFN (Italy)
  35. NRF (Republic of Korea)
  36. WCU (Republic of Korea)
  37. LAS (Lithuania)
  38. CINVESTAV (Mexico)
  39. CONACYT (Mexico)
  40. SEP (Mexico)
  41. UASLP-FAI (Mexico)
  42. MSI (New Zealand)
  43. PAEC (Pakistan)
  44. MSHE (Poland)
  45. NSC (Poland)
  46. FCT (Portugal)
  47. JINR (Armenia)
  48. JINR (Belarus)
  49. JINR (Georgia)
  50. JINR (Ukraine)
  51. JINR (Uzbekistan)
  52. MON (Russia)
  53. RosAtom (Russia)
  54. RAS (Russia)
  55. RFBR (Russia)
  56. MSTD (Serbia)
  57. SEIDI (Spain)
  58. CPAN (Spain)
  59. Swiss Funding Agencies (Switzerland)
  60. NSC (Taipei)
  61. ThEPCenter (Thailand)
  62. IPST (Thailand)
  63. NSTDA (Thailand)
  64. TUBITAK (Turkey)
  65. TAEK (Turkey)
  66. NASU (Ukraine)
  67. STFC (United Kingdom)
  68. DOE (USA)
  69. NSF (USA)
  70. Marie-Curie programme (European Union)
  71. European Research Council (European Union)
  72. EPLANET (European Union)
  73. Leventis Foundation
  74. A.P. Sloan Foundation
  75. Alexander von Humboldt Foundation
  76. Belgian Federal Science Policy Office
  77. Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
  78. Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
  79. Ministry of Education, Youth and Sports (MEYS) of Czech Republic
  80. Council of Science and Industrial Research, India
  81. Compagnia di San Paolo (Torino)
  82. HOMING PLUS programme of Foundation for Polish Science
  83. EU, Regional Development Fund
  84. Thalis programme
  85. Aristeia programme
  86. EU-ESF
  87. Greek NSRF
  88. Science and Technology Facilities Council [ST/K001639/1, ST/F006748/1, ST/G502347/1, ST/F007434/1, ST/K003844/1 GRIDPP, GRIDPP, ST/I005912/1, ST/F007094/1, ST/K001604/1, ST/K003844/1, ST/J004901/1, ST/I505572/1, ST/I000410/1, ST/L00609X/1, ST/J005665/1, ST/K003542/1 GRID PP, ST/I005912/1 GRIDPP, ST/I505580/1, ST/I002200/1, ST/L00609X/1 GRIDPP, ST/K001256/1] Funding Source: researchfish
  89. STFC [ST/F007434/1, ST/I505572/1, ST/H00081X/2, ST/K001604/1, ST/K003844/1, ST/G502347/1, ST/L00609X/1, ST/K001639/1, ST/F006748/1, ST/I000410/1, ST/I005912/1, ST/I505580/1, ST/J005665/1, ST/F007094/1, ST/J004901/1, ST/I002200/1] Funding Source: UKRI
  90. Direct For Mathematical & Physical Scien
  91. Division Of Physics [1211067, 1205960, 0969555, 1151640] Funding Source: National Science Foundation
  92. Division Of Physics
  93. Direct For Mathematical & Physical Scien [1314131] Funding Source: National Science Foundation

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A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, < p(T1,2)>, of the two leading jets in the event. The data sample was collected during 2011 at a proton-proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 5.0 fb(-1). The strong coupling constant at the scale of the Z boson mass is determined to be alpha(S)(M-Z) = 0.1148 +/- 0.0014 (exp.) +/- 0.0018 (PDF) +/- 0.0050 (theory), by comparing the ratio in the range 0.42 < < p(T1,2)> < 1.39 TeV to the predictions of perturbative QCD at next-to-leading order. This is the first determination of alpha(S)(M-Z) from measurements at momentum scales beyond 0.6 TeV. The predicted ratio depends only indirectly on the evolution of the parton distribution functions of the proton such that this measurement also serves as a test of the evolution of the strong coupling constant. No deviation from the expected behaviour is observed.

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