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Neutral pion and $\eta$ meson production at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

The ALICE collaboration
Phys.Rev., 2018

Abstract (data abstract)
CERN-LHC. Neutral pion and $\eta$ meson production in the transverse momentum range 1 $< p_{\rm T} <$ 20 GeV/$c$ have been measured at midrapidity by the ALICE experiment at the Large Hadron Collider (LHC) in central and semi-central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. These results extend the $p_{\rm T}$ reach of the previous ALICE PI0 measurements from 12 GeV/$c$ to 20 GeV/$c$ and present the first measurement of the ETA meson in heavy-ion collisions at the LHC. The $\eta$ to $\pi^{0}$ ratio is similar for the two centralities and reaches a plateau value of 0.457 $\pm$ 0.013$^{stat}$ $\pm$ 0.018$^{syst}$. A suppression of the same magnitude for $\pi^{0}$ and $\eta$ meson production is observed in Pb-Pb collisions with respect to their production in pp collisions scaled by the number of binary nucleon-nucleon collisions. For both mesons, the nuclear modification factor $R_{\rm AA}$ reaches a minimum at $p_{\rm T} \approx $ 7 GeV/$c$ and then increases with transverse momentum. The measurements show a stronger suppression with respect to what was observed at lower center-of-mass energies in the $p_{\rm T}$ range 6 $< p_{\rm T} <$ 10 GeV/$c$. The results are compared with statistical hadronization models at low-$p_{\rm T}$ and with NLO pQCD jet quenching predictions at high-$p_{\rm T}$.

  • Table 1

    Data from Figure 2 and 6

    10.17182/hepdata.83964.v1/t1

    Invariant yields of the $\pi^{0}$ meson in the centrality class 0-10% in Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at...

  • Table 2

    Data from Figure 2 and 6

    10.17182/hepdata.83964.v1/t2

    Invariant yields of the $\pi^{0}$ meson in the centrality class 20-50% in Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at...

  • Table 3

    Data from Figure 2 and 6

    10.17182/hepdata.83964.v1/t3

    Invariant yields of the $\eta$ meson in the centrality class 0-10% in Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at...

  • Table 4

    Data from Figure 2 and 6

    10.17182/hepdata.83964.v1/t4

    Invariant yields of the $\eta$ meson in the centrality class 20-50% in Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at...

  • Table 5

    Data from Figure 4, 5 and 8

    10.17182/hepdata.83964.v1/t5

    Nuclear modification factor R_AA of $\pi^{0}$ produced in 0-10% central Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at mid-rapidity, T_AA...

  • Table 6

    Data from Figure 4 and 8

    10.17182/hepdata.83964.v1/t6

    Nuclear modification factor R_AA of $\pi^{0}$ produced in 20-50% central Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at mid-rapidity, T_AA...

  • Table 7

    Data from Figure 4, 5 and 8

    10.17182/hepdata.83964.v1/t7

    Nuclear modification factor R_AA of $\eta$ produced in 0-10% central Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at mid-rapidity, T_AA...

  • Table 8

    Data from Figure 4 and 8

    10.17182/hepdata.83964.v1/t8

    Nuclear modification factor R_AA of $\eta$ produced in 20-50% central Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at mid-rapidity, T_AA...

  • Table 9

    Data from Figure 3 and 7

    10.17182/hepdata.83964.v1/t9

    Ratio of the $\eta$ to $\pi^{0}$ invariant yields in 0-10% central Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at mid-rapidity.

  • Table 10

    Data from Figure 3 and 7

    10.17182/hepdata.83964.v1/t10

    Ratio of the $\eta$ to $\pi^{0}$ invariant yields in 20-50% central Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV at mid-rapidity.

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