Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.142004
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Funding
- CAPES
- CNPq
- FAPERJ
- FINEP (Brazil)
- MOST
- NSFC (China)
- CNRS/IN2P3 (France)
- BMBF, DFG
- MPG (Germany)
- NWO
- MNiSW
- NCN (Poland)
- MEN/IFA (Romania)
- MICINN (Spain)
- SNSF
- SER (Switzerland)
- NASU (Ukraine)
- NSF
- IN2P3 (France), KIT
- DESY (Germany)
- INFN (Italy)
- PIC (Spain)
- GridPP (United Kingdom)
- Yandex LLC (Russia)
- CSCS (Switzerland)
- IFIN-HH (Romania)
- CBPF (Brazil)
- PL-GRID (Poland)
- OSC (USA)
- AvH Foundation (Germany)
- EPLANET, Marie Sklodowska-Curie Actions
- ERC
- ANR
- Labex P2IO and OCEVU
- egion Auvergne-Rhone-Alpes (France)
- Key Research Program of Frontier Sciences of CAS
- Thousand Talents Program
- Program of Guangzhou (China)
- RFBR
- RSF
- GVA
- XuntaGal and GENCAT (Spain)
- Royal Society
- 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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