2012/05/31 by S. Chatrchyan, CMS Collaboration, V. Khachatryan +98 · 6 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #nucl-ex
paper · pdf · doi:10.1007/jhep10(2012)087
published as JHEP 10 (2012) 087 · Submitted to the Journal of High Energy Physics
openalex publication_date 2012/10/01 · arxiv created 2013/01/25 · arxiv updated 2013/01/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
A bstract Jet fragmentation in pp and PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair was studied using data collected with the CMS detector at the LHC. Fragmentation functions are constructed using charged-particle tracks with transverse momenta p T > 4 GeV/ c for dijet events with a leading jet of p T > 100 GeV/ c . The fragmentation functions in PbPb events are compared to those in pp data as a function of collision centrality, as well as dijet- p T imbalance. Special emphasis is placed on the most central PbPb events including dijets with unbalanced momentum, indicative of energy loss of the hard scattered parent partons. The fragmentation patterns for both the leading and subleading jets in PbPb collisions agree with those seen in pp data at 2.76 TeV. The results provide evidence that, despite the large parton energy loss observed in PbPb collisions, the partition of the remaining momentum within the jet cone into high- p T particles is not strongly modified in comparison to that observed for jets in vacuum.