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arXiv · 1908.11636

Charged-hadron suppression in Pb+Pb and Xe+Xe collisions measured with the ATLAS detector

Petr Balek
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Abstract

The ATLAS detector at the LHC recorded 0.49nb$^{-1}$ of Pb+Pb collisions and 25pb$^{-1}$ of $pp$ collisions, both at the center-of-mass energy 5.02TeV per nucleon pair. Recently, ATLAS also recorded 3$\mu$b$^{-1}$ of Xe+Xe collisions at the center-of-mass energy 5.44TeV, which provides a new opportunity to study the system-size dependence of the charged-hadron production in heavy-ion collisions. The large acceptance of the ATLAS detector allows to measure the spectra of charged hadrons in a wide range of pseudorapidity and transverse momentum. The nuclear modification factors $R_\mathrm{AA}$ are constructed as a ratio of the spectra measured in Pb+Pb or Xe+Xe collisions to that measured in $pp$ collisions. The $R_\mathrm{AA}$ obtained in the two systems are presented for different centrality intervals and the results are discussed.

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Petr Balek. 2019-08-30. Charged-hadron suppression in Pb+Pb and Xe+Xe collisions measured with the ATLAS detector. https://doi.org/10.1016/j.nuclphysa.2018.10.079

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