$\pi ^{0}$ and $\eta $ meson production in proton-proton collisions at $\sqrt{s}=8$ TeV
Eur.Phys.J. C78 (2018) 263, 2018.
The ALICE collaboration

Abstract (data abstract)
CERN-LHC. An invariant differential cross section measurement of inclusive $\pi^{0}$ and $\eta$ meson production at mid-rapidity in pp collisions at $\sqrt{s}=8$~TeV was carried out by the ALICE experiment at the LHC. The spectra of $\pi^{0}$ and $\eta$ mesons are measured in transverse momentum ranges of $0.3<p_{\rm T}<35$~GeV/$c$ and $0.5<p_{\rm T}<35$~GeV/$c$, respectively. Next-to-leading order perturbative QCD calculations using fragmentation functions DSS14 for the $\pi^{0}$ and AESSS for the $\eta$ overestimate the cross sections of both neutral mesons, although such calculations agree with the measured $\eta/\pi^{0}$ ratio within uncertainties. The results are also compared with PYTHIA~8.2 predictions for which the Monash~2013 tune yields the best agreement with the measured neutral meson spectra. The measurements confirm a universal behavior of the $\eta/\pi^{0}$ ratio seen for NA27, PHENIX and ALICE data for pp collisions from $\sqrt{s}=27.5$~GeV to $\sqrt{s}=8$~TeV within experimental uncertainties. A relation between the $\pi^{0}$ and $\eta$ production cross sections for pp collisions at $\sqrt{s}=8$~TeV is given by \mT scaling for $p_{\rm T}>3.5$~GeV/$c$. However, a deviation from this empirical scaling rule is observed for transverse momenta below $p_{\rm T}<3.5$~GeV/$c$ in the $\eta/\pi^{0}$ ratio with a significance of $6.2\sigma$.

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