Measurement of jet fragmentation in Pb+Pb and pp collisions at s NN = 2.76 TeV with the ATLAS detector at the LHC

The European Physical Journal. C, Particles and Fields
M AaboudATLAS Collaboration

Abstract

The distributions of transverse momentum and longitudinal momentum fraction of charged particles in jets are measured in Pb+Pb and pp collisions with the ATLAS detector at the LHC. The distributions are measured as a function of jet transverse momentum and rapidity. The analysis utilises an integrated luminosity of 0.14 nb - 1 of Pb+Pb data and 4.0 pb - 1 of pp data collected in 2011 and 2013, respectively, at the same centre-of-mass energy of 2.76 TeV per colliding nucleon pair. The distributions measured in pp collisions are used as a reference for those measured in Pb+Pb collisions in order to evaluate the impact on the internal structure of jets from the jet energy loss of fast partons propagating through the hot, dense medium created in heavy-ion collisions. Modest but significant centrality-dependent modifications of fragmentation functions in Pb+Pb collisions with respect to those in pp collisions are seen. No significant dependence of modifications on jet p T and rapidity selections is observed except for the fragments with the highest transverse momenta for which some reduction of yields is observed for more forward jets.

References

Jan 1, 2016·The European Physical Journal. C, Particles and Fields·G AadUNKNOWN ATLAS Collaboration

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Citations

Jan 1, 2018·The European Physical Journal. C, Particles and Fields·M AaboudUNKNOWN ATLAS Collaboration
May 6, 2019·Physical Review Letters·A M SirunyanUNKNOWN CMS Collaboration
Sep 22, 2020·Physical Review Letters·A M SirunyanUNKNOWN CMS Collaboration
Apr 26, 2018·Physical Review Letters·A M SirunyanUNKNOWN CMS Collaboration
Jan 21, 2021·Reports on Progress in Physics·Shanshan Cao, Xin-Nian Wang

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Software Mentioned

GEANT4
RooUnfold
PYTHIA
Sigma

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