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Article Dans Une Revue Phys.Rev.C Année : 2020

Jet overlap in heavy ion collisions at energies available at the CERN Large Hadron Collider and its consequences for the jet shape

Résumé

Central lead-lead collisions at energies available at the CERN Large Hadron Collider (LHC) may pose a particular challenge for jet identification as multiple jets are produced per each collision event. We simulate the jet evolution in central PbPb events at sNN=2.76GeV collision energy with the epos3 initial state, which typically contains multiple hard scatterings in each event. Therefore the partons from different jets have a significant chance to overlap in momentum space. We find that 30% of the jets with p⊥>50GeV, identified by the standard anti-k⊥ jet finding algorithm with jet cone size R=0.3, contain “intruder” particles from overlapping generator-level jets. This fraction increases with increasing beam energy and increasing R. The reconstructed momentum of the jet differs from that of the modeled jet by the loss due to jet partons which are outside of the jet cone and by the gain due to intruder partons. The sum of both may be positive or negative. These intruder partons particularly affect the radial jet momentum distribution because they contribute mostly at large angles Δr with respect to the jet center. The study stresses the importance of the jet overlap effect emerging in central lead-lead collisions at LHC energies, while being negligible in peripheral PbPb or pPb/pp collisions.

Dates et versions

hal-02290750 , version 1 (17-09-2019)

Identifiants

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Iurii Karpenko, Joerg Aichelin, Pol-Bernard Gossiaux, Martin Rohrmoser, Klaus Werner. Jet overlap in heavy ion collisions at energies available at the CERN Large Hadron Collider and its consequences for the jet shape. Phys.Rev.C, 2020, 101 (1), pp.014905. ⟨10.1103/PhysRevC.101.014905⟩. ⟨hal-02290750⟩
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