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Measurement of nuclear modification factor $R_\mathrm{AA}$ in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$TeV with the ATLAS detector at the LHC ATLAS-CONF-2017-012 6 February 2017 | |
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| Abstract | |
| Measurements of charged hadron spectra and the nuclear modification factor in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$TeV with the ATLAS detector at the LHC are presented. The measurements are performed using data with an integrated luminosity of 0.49nb${}^{-1}$ in Pb+Pb collisions and 25pb${}^{-1}$ in pp collisions, obtained in the 2015 LHC physics run. Charged hadron Pb+Pb spectra measured in several centrality intervals are divided by pp spectrum to form the nuclear modification factor, $R_\mathrm{AA}$, which provides insight into the effects of jet quenching in nuclear collisions. The behavior of $R_\mathrm{AA}$ is studied as a function of transverse momentum up to 300GeV in different centralities. The values of $R_\mathrm{AA}$ measured at $\sqrt{s_{NN}}=5.02$TeV are found to be consistent with the previous measurements at $\sqrt{s_{NN}}=2.76$TeV published by the ATLAS experiment. | |
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Figure 1: Charged hadron production cross sections as a function of pT measured in Pb+Pb collisions at √s=5.02TeV for five centrality intervals: 0-5%, 10-20%, 30-40%, 50-60% and 60-80%. Cross section measured in pp collisions is shown as well. The statistical uncertainties are smaller than the marker size, and the boxes represent systematic uncertainties. Curves are scaled down by constant factors for clarity of the plot. png (219kB), pdf (28kB) |
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Figure 2: Nuclear modification factor RAA as a function of pT for charged hadrons measured in Pb+Pb collisions at √s=5.02TeV for five centrality intervals: 0-5%, 10-20%, 30-40%, 50-60% and 60-80%. The statistical uncertainties are shown with the bars and the brackets represent systematic uncertainties. png (127kB), pdf (28kB) |
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Figure 3: Nuclear modification factor RAA for charged hadrons measured in Pb+Pb collisions at √s=5.02TeV as a function of <Npart> for four transverse momentum ranges mentioned in the text. The statistical uncertainties are smaller than the marker size, and the brackets represent systematic uncertainties. png (45kB), pdf (16kB) |
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