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Charged-particle nuclear modification factors in XeXe collisions at $ \sqrt{s_{\mathrm{NN}}} = 5.44 $ TeV

The CMS collaboration
JHEP 1810 (2018) 138, 2018

Abstract
The differential yields of charged particles having pseudorapidity within |η| < 1 are measured using xenon-xenon (XeXe) collisions at $ \sqrt{s_{\mathrm{NN}}} = 5.44 $ TeV. The data, corresponding to an integrated luminosity of 3.42 μb$^{−1}$, were collected in 2017 by the CMS experiment at the LHC. The yields are reported as functions of collision centrality and transverse momentum, p$_{T}$, from 0.5 to 100 GeV. A previously reported p$_{T}$ spectrum from proton-proton collisions at $ \sqrt{s}=5.02 $ TeV is used for comparison after correcting for the difference in center-of-mass energy. The nuclear modification factors using this reference, R$_{AA}^{*}$ , are constructed and compared to previous measurements and theoretical predictions. In head-on collisions, the R$_{AA}^{*}$ has a value of 0.17 in the p$_{T}$ range of 6–8 GeV, but increases to approximately 0.7 at 100 GeV. Above ≈6 GeV, the XeXe data show a notably smaller suppression than previous results for lead-lead (PbPb) collisions at $ \sqrt{s_{\mathrm{NN}}}=5.02 $ TeV when compared at the same centrality (i.e., the same fraction of total cross section). However, the XeXe suppression is slightly greater than that for PbPb in events having a similar number of participating nucleons.

  • Table 1

    Fig 3

    10.17182/hepdata.85626.v1/t1

    The per-event differential invariant yield of charged particles having |eta|<1 in XeXe collisions at sqrt(s_NN)=5.44 TeV. The first systematic uncertainty...

  • Table 2

    Fig 3, black crosses

    10.17182/hepdata.85626.v1/t2

    The per-event differential invariant yield of charged particles having |eta|<1 in pp collisions at sqrt(s)=5.44 TeV, after extrpolation from 5.02...

  • Table 3

    Fig 4

    10.17182/hepdata.85626.v1/t3

    The nuclear modification factor of charged particles having |eta|<1 in XeXe collisions at sqrt(s_NN)=5.44 TeV. The first systematic uncertainty describes...

  • Table 4

    Fig 8, 0-10%

    10.17182/hepdata.85626.v1/t4

    The nuclear modification factor of charged particles having |eta|<1 in XeXe collisions at sqrt(s_NN)=5.44 TeV. The first systematic uncertainty describes...

  • Table 5

    Supplementary Figure 1, 0-80%

    10.17182/hepdata.85626.v1/t5

    The nuclear modification factor of charged particles having |eta|<1 in XeXe collisions at sqrt(s_NN)=5.44 TeV. The first systematic uncertainty describes...

  • Table 6

    Figure 5

    10.17182/hepdata.85626.v1/t6

    The RXePb of charged particles having |eta|<1 in XeXe collisions at sqrt(s_NN)=5.44 TeV and PbPb collisions at sqrt(s_NN)=5.02 TeV. The...

  • Table 7

    Figure 7, 0-5%/10-30%

    10.17182/hepdata.85626.v1/t7

    The RXePb of charged particles having |eta|<1 in XeXe collisions at sqrt(s_NN)=5.44 TeV and PbPb collisions at sqrt(s_NN)=5.02 TeV. The...

  • Table 8

    Figure 7, 70-80%/70-90%

    10.17182/hepdata.85626.v1/t8

    The RXePb of charged particles having |eta|<1 in XeXe collisions at sqrt(s_NN)=5.44 TeV and PbPb collisions at sqrt(s_NN)=5.02 TeV. The...

  • Table 9

    Supplementary Figure 3, 5-10%/10-30%

    10.17182/hepdata.85626.v1/t9

    The RXePb of charged particles having |eta|<1 in XeXe collisions at sqrt(s_NN)=5.44 TeV and PbPb collisions at sqrt(s_NN)=5.02 TeV. The...

  • Table 10

    Table 1

    10.17182/hepdata.85626.v1/t10

    The average N_part, N_coll, and TAA for various centrality classes of XeXe collisions at 5.44 TeV.

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