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Measurement of jet fragmentation in Pb+Pb and pp collisions at [Formula omitted] TeV with the ATLAS detector at the LHC

Aaboud, M ; Aad, G ; Abbott, B ; Abdallah, J ; Abdinov, O ; Abeloos, B ; Abidi, S. H

The European physical journal. C, Particles and fields, 2017-06, Vol.77 (6) [Peer Reviewed Journal]

Springer

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  • Title:
    Measurement of jet fragmentation in Pb+Pb and pp collisions at [Formula omitted] TeV with the ATLAS detector at the LHC
  • Author: Aaboud, M ; Aad, G ; Abbott, B ; Abdallah, J ; Abdinov, O ; Abeloos, B ; Abidi, S. H
  • Subjects: Detectors ; Measurement
  • Is Part Of: The European physical journal. C, Particles and fields, 2017-06, Vol.77 (6)
  • Description: 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 [Formula omitted] of Pb+Pb data and 4.0 pb [Formula omitted] 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 [Formula omitted] 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.
  • Publisher: Springer
  • Language: English
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