4.5 Article

First measurement of large area jet transverse momentum spectra in heavy-ion collisions

Journal

JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 5, Pages -

Publisher

SPRINGER
DOI: 10.1007/JHEP05(2021)284

Keywords

Hadron-Hadron scattering (experiments); Heavy-ion collision; Jets

Funding

  1. BMBWF (Austria)
  2. FWF (Austria)
  3. FNRS (Belgium)
  4. FWO (Belgium)
  5. CNPq (Brazil)
  6. CAPES (Brazil)
  7. FAPERJ (Brazil)
  8. FAPERGS (Brazil)
  9. FAPESP (Brazil)
  10. MES (Bulgaria)
  11. CERN
  12. CAS (China)
  13. MoST (China)
  14. NSFC (China)
  15. COLCIENCIAS (Colombia)
  16. MSES (Croatia)
  17. CSF (Croatia)
  18. RIF (Cyprus)
  19. SENESCYT (Ecuador)
  20. MoER (Estonia)
  21. ERC PUT (Estonia)
  22. ERDF (Estonia)
  23. Academy of Finland (Finland)
  24. MEC (Finland)
  25. HIP (Finland)
  26. CEA (France)
  27. CNRS/IN2P3 (France)
  28. BMBF (Germany)
  29. DFG (Germany)
  30. HGF (Germany)
  31. GSRT (Greece)
  32. NKFIA (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. MES (Latvia)
  41. LAS (Lithuania)
  42. MOE (Malaysia)
  43. UM (Malaysia)
  44. BUAP (Mexico)
  45. CINVESTAV (Mexico)
  46. CONACYT (Mexico)
  47. LNS (Mexico)
  48. SEP (Mexico)
  49. UASLP-FAI (Mexico)
  50. MOS (Montenegro)
  51. MBIE (New Zealand)
  52. PAEC (Pakistan)
  53. MSHE (Poland)
  54. NSC (Poland)
  55. FCT (Portugal)
  56. JINR (Dubna)
  57. MON (Russia)
  58. RosAtom (Russia)
  59. RAS (Russia)
  60. RFBR (Russia)
  61. NRC KI (Russia)
  62. MESTD (Serbia)
  63. SEIDI (Spain)
  64. CPAN (Spain)
  65. PCTI (Spain)
  66. FEDER (Spain)
  67. MOSTR (Sri Lanka)
  68. Swiss Funding Agencies (Switzerland)
  69. MST (Taipei)
  70. ThEPCenter (Thailand)
  71. IPST (Thailand)
  72. STAR (Thailand)
  73. NSTDA (Thailand)
  74. TUBITAK (Turkey)
  75. TAEK (Turkey)
  76. NASU (Ukraine)
  77. STFC (United Kingdom)
  78. DOE (U.S.A.)
  79. NSF (U.S.A.)
  80. Marie-Curie program (European Union) [675440, 724704, 752730, 765710]
  81. European Research Council (European Union) [675440, 724704, 752730, 765710]
  82. Horizon 2020 Grant (European Union) [675440, 724704, 752730, 765710]
  83. Leventis Foundation
  84. Alfred P. Sloan Foundation
  85. Alexander von Humboldt Foundation
  86. Belgian Federal Science Policy Office
  87. Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
  88. Agentschap voor Innovatie doorWetenschap en Technologie (IWT-Belgium)
  89. F.R.S.-FNRS (Belgium) [30820817]
  90. FWO (Belgium) [30820817]
  91. Beijing Municipal Science AMP
  92. Technology Commission [Z191100007219010]
  93. Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
  94. Deutsche Forschungsgemeinschaft (DFG), under Germany's Excellence Strategy [EXC 2121, 390833306, 400140256 GRK2497]
  95. Lendulet (Momentum) Program of the Hungarian Academy of Sciences (Hungary)
  96. Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences (Hungary)
  97. New National Excellence Program UNKP (Hungary)
  98. NKFIA (Hungary) [123842, 123959, 124845, 124850, 125105, 128713, 128786, 129058]
  99. Council of Science and Industrial Research, India
  100. Ministry of Science and Higher Education (Poland) [2014/15/B/ST2/03998, 2015/19/B/ST2/02861]
  101. National Science Center (Poland) [2014/15/B/ST2/03998, 2015/19/B/ST2/02861]
  102. National Priorities Research Program by Qatar National Research Fund
  103. Ministry of Science and Higher Education (Russia) [0723-2020-0041]
  104. Programa Estatal de Fomento de la Investigacion Cientifica y Tecnica de Excelencia Maria de Maeztu [MDM-20150509]
  105. Programa Severo Ochoa del Principado de Asturias
  106. Thalis program - EU-ESF
  107. Aristeia program - EU-ESF
  108. Greek NSRF
  109. Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand)
  110. Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)
  111. Kavli Foundation
  112. Nvidia Corporation
  113. SuperMicro Corporation
  114. Welch Foundation [C-1845]
  115. Weston Havens Foundation (U.S.A.)

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The production of jets in PbPb and pp collisions at a center-of-mass energy of 5.02TeV was studied using the CMS detector at the LHC. The study revealed a strong suppression of high-p(T) jets in the most central collisions, with the jet nuclear modification factors extracted from properly normalized spectra. Various modern event generators and analytic calculations were compared to the data, however, none fully reproduced the observed results.
Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to integrated luminosities of 404 mu b(-1) and 27.4 pb(-1), respectively. Jets with different areas are reconstructed using the anti-k(T) algorithm by varying the distance parameter R. The measurements are performed using jets with transverse momenta (p(T)) greater than 200 GeV and in a pseudorapidity range of vertical bar eta vertical bar < 2. To reveal the medium modification of the jet spectra in PbPb collisions, the properly normalized ratio of spectra from PbPb and pp data is used to extract jet nuclear modification factors as functions of the PbPb collision centrality, p(T) and, for the first time, as a function of R up to 1.0. For the most central collisions, a strong suppression is observed for high-p(T) jets reconstructed with all distance parameters, implying that a significant amount of jet energy is scattered to large angles. The dependence of jet suppression on R is expected to be sensitive to both the jet energy loss mechanism and the medium response, and so the data are compared to several modern event generators and analytic calculations. The models considered do not fully reproduce the data.

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