13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Energy and system dependence of nuclear modification factors of inclusive charged particles and identified light hadrons measured in p-Pb, Xe-Xe and Pb-Pb collisions with ALICE

15 May 2018, 09:00
Sala Perla, 1st Floor (Palazzo del Casinò)

Sala Perla, 1st Floor

Palazzo del Casinò

Parallel Talk Jet modifications and high-pT hadrons Jet modifications and high-pT hadrons


Daiki Sekihata (Hiroshima University (JP))


We report recent ALICE results on primary charged particle and neutral meson production in pp (2.76, 5.02, 7 and 8 TeV), p-Pb (5.02 TeV), Pb-Pb (2.76 and 5.02 TeV) and Xe-Xe (5.44 TeV) collisions. The transverse momentum ($p_{\rm T}$) spectra of charged hadrons used in the analysis were measured in the kinematic range of $0.15 < p_{\rm T} < 50$ GeV/$c$ and $ |\eta|< 0.8$. The charged hadron spectra from Pb-Pb and Xe-Xe collisions are divided in nine centrality intervals in the range of 0-80 %. As we achieved significantly smaller systematic uncertainties in the current analysis, the previously published results from p-Pb and Pb-Pb (2.76 TeV) collisions were reanalyzed.

Neutral mesons were reconstructed through their two-photons decays. The photons were measured via several complementary methods, using eighter the central tracking system identifying photons converted to $e^{+} e^{-}$ pairs in the material of the inner barrel detectors or the electromagnetic calorimeters. Thus we used the respective advantages of the detectors, i.e. the excellent momentum resolution of the conversion photons down to very low transverse momenta and the high reconstruction efficiency and triggering capability of calorimeters. This approach allowed to measure the neutral meson spectra in wide range of transverse momenta.

In this talk we will report a measurement of the nuclear modification factors of primary charged particles and of light neutral mesons in Pb--Pb (2.76 TeV and 5.02 TeV), in Xe-Xe (5.44 TeV) and in p-Pb (5.02 TeV) collisions with ALICE at the LHC. We compare the nuclear modification factors obtained for different collision systems as a function of transverse momentum, collision centrality as well as charged particle multiplicity (${\rm d}N_{{\rm ch}}/\rm{d}\eta$). We will present comparison to results from other experiments and to model calculations and review several scaling properties such as transverse mass scaling and $x_{\rm T}$ scaling in pp collisions.

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Collaboration ALICE

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