# Measurement of internal structure of jets in Pb+Pb collisions at $\sqrt{s_\mathrm{NN}} = 2.76$ TeV with the ATLAS detector at the LHC

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 $p_{\mathrm{T}}$ 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.
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Journal articles
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http://hal.in2p3.fr/in2p3-01454730
Contributor : Danielle Cristofol <>
Submitted on : Friday, February 3, 2017 - 8:29:42 AM
Last modification on : Monday, October 22, 2018 - 9:42:01 AM

### Citation

M. Aaboud, G. Aad, M. Alstaty, M. Barbero, A. Calandri, et al.. Measurement of internal structure of jets in Pb+Pb collisions at $\sqrt{s_\mathrm{NN}} = 2.76$ TeV with the ATLAS detector at the LHC. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2017, 77, pp.379. ⟨10.1140/epjc/s10052-017-4915-5⟩. ⟨in2p3-01454730⟩

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