4.8 Article

Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at √sNN =5 TeV

期刊

PHYSICAL REVIEW LETTERS
卷 128, 期 14, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.142004

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资金

  1. CAPES
  2. CNPq
  3. FAPERJ
  4. FINEP (Brazil)
  5. MOST
  6. NSFC (China)
  7. CNRS/IN2P3 (France)
  8. BMBF, DFG
  9. MPG (Germany)
  10. NWO
  11. MNiSW
  12. NCN (Poland)
  13. MEN/IFA (Romania)
  14. MICINN (Spain)
  15. SNSF
  16. SER (Switzerland)
  17. NASU (Ukraine)
  18. NSF
  19. IN2P3 (France), KIT
  20. DESY (Germany)
  21. INFN (Italy)
  22. PIC (Spain)
  23. GridPP (United Kingdom)
  24. Yandex LLC (Russia)
  25. CSCS (Switzerland)
  26. IFIN-HH (Romania)
  27. CBPF (Brazil)
  28. PL-GRID (Poland)
  29. OSC (USA)
  30. AvH Foundation (Germany)
  31. EPLANET, Marie Sklodowska-Curie Actions
  32. ERC
  33. ANR
  34. Labex P2IO and OCEVU
  35. egion Auvergne-Rhone-Alpes (France)
  36. Key Research Program of Frontier Sciences of CAS
  37. Thousand Talents Program
  38. Program of Guangzhou (China)
  39. RFBR
  40. RSF
  41. GVA
  42. XuntaGal and GENCAT (Spain)
  43. Royal Society
  44. Leverhulme Trust (United Kingdom)

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This study investigates the production of prompt charged particles in proton-lead collisions and proton-proton collisions at the LHCb. The results show a suppression of charged particle production in forward region of proton-lead collisions compared to proton-proton collisions, while an enhancement is observed in the backward region for higher transverse momentum.
The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy root s(NN) = 5 TeV is studied at LHCb as a function of pseudorapidity (eta) and transverse momentum (p(T) ) with respect to the proton beam direction. The nuclear modification factor for charged particles is determined as a function of eta between -4.8 < eta < -2.5 (backward region) and 2.0 < eta < 4.8 (forward region), and p(T) between 0.2 < p(T) < 8.0 GeV/c. The results show a suppression of charged particle production in proton-lead collisions relative to proton-proton collisions in the forward region and an enhancement in the backward region for p(T) larger than 1.5 GeV/c. This measurement constrains nuclear PDFs and saturation models at previously unexplored values of the parton momentum fraction down to 10(-6).

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