Suppression of charged particle production at large transverse momentum in central Pb–Pb collisions at sNN=2.76 TeV

2010/12/15 by K. Aamodt, ALICE Collaboration, A. Abrahantes Quintana +97 · 19 citations
Physics and Astronomy · #Atomic physics #Charged particle #Hadron #High-Energy Particle Collisions Research #Impact parameter #Ion #Large Hadron Collider #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Spectral line #nucl-ex

paper · pdf · doi:10.1016/j.physletb.2010.12.020

published as Phys. Lett. B 696 (2011) 30-39 · 15 pages, 5 captioned figures, 3 tables, authors from page 10, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/989

openalex publication_date 2010/12/15 · openalex created_date 2016/06/24 · arxiv created 2017/09/28 · arxiv updated 2017/10/02 · openalex updated_date 2026/08/06

Abstract

Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at sNN=2.76TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0–5% and 70–80% of the hadronic Pb–Pb cross section. The measured charged particle spectra in |η|<0.8 and 0.3<pT<20GeV/c are compared to the expectation in pp collisions at the same sNN, scaled by the number of underlying nucleon–nucleon collisions. The comparison is expressed in terms of the nuclear modification factor RAA. The result indicates only weak medium effects (RAA≈0.7) in peripheral collisions. In central collisions, RAA reaches a minimum of about 0.14 at pT=6–7GeV/c and increases significantly at larger pT. The measured suppression of high-pT particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb–Pb collisions at the LHC.

Citations

• Deciphering the properties of the medium produced in heavy ion collisions at RHIC by a pQCD analysis of quenched largep⊥π0spectra
• Saturation and universality in QCD at small x
• Transverse momentum spectra of charged particles in proton–proton collisions at s=900 GeV with ALICE at the LHC
• Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions

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