cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.160597.v1/t64
title: "Table 64" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: Slope parameter (n) of a power-law fit ($f(p_{\rm T}) = \alpha p_{\rm T}^{-n}$) for $5 &lt; p_{\rm T} &lt; 15$ GeV/$c$ as a function the charged-particle multiplicity density in units of the average normalized multiplicity density for the INEL&gt;0 event class for the neutral pion.
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t65
title: "Table 65" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: Slope parameter (k) of an exponential fit ($f(p_{\rm T}) = \alpha e^{-p_{\rm T}/k}$) for $0.4 &lt; p_{\rm T} &lt; 2$ GeV/$c$ as a function the charged-particle multiplicity density in units of the average normalized multiplicity density for the INEL&gt;0 event class for the neutral pion.
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t66
title: "Table 66" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: Slope parameter (n) of a power-law fit ($f(p_{\rm T}) = \alpha p_{\rm T}^{-n}$) for $5 &lt; p_{\rm T} &lt; 15$ GeV/$c$ as a function the charged-particle multiplicity density in units of the average normalized multiplicity density for the INEL&gt;0 event class for the eta meson.
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t67
title: "Table 67" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: Slope parameter (k) of an exponential fit ($f(p_{\rm T}) = \alpha e^{-p_{\rm T}/k}$) for $1.5 &lt; p_{\rm T} &lt; 4$ GeV/$c$ as a function the charged-particle multiplicity density in units of the average normalized multiplicity density for the INEL&gt;0 event class for the eta meson.
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t68
title: "Table 68" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: $\eta/\pi^{0}$ ratio as a function of $p_{\rm T}$ for pp collisions at $\sqrt{s}$ = 13 TeV in INEL&gt;0 collisions in the V0M multiplicity class 0-100%.
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t69
title: "Table 69" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: $\eta/\pi^{0}$ ratio as a function of $p_{\rm T}$ for pp collisions at $\sqrt{s}$ = 13 TeV in INEL&gt;0 collisions in the V0M multiplicity class 70-100% (data points not shown in figure 13).
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t70
title: "Table 70" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: $\eta/\pi^{0}$ ratio as a function of $p_{\rm T}$ for pp collisions at $\sqrt{s}$ = 13 TeV in INEL&gt;0 collisions in the V0M multiplicity class 50-70%.
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t71
title: "Table 71" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: $\eta/\pi^{0}$ ratio as a function of $p_{\rm T}$ for pp collisions at $\sqrt{s}$ = 13 TeV in INEL&gt;0 collisions in the V0M multiplicity class 30-50% (data points not shown in figure 13).
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t72
title: "Table 72" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: $\eta/\pi^{0}$ ratio as a function of $p_{\rm T}$ for pp collisions at $\sqrt{s}$ = 13 TeV in INEL&gt;0 collisions in the V0M multiplicity class 20-30% (data points not shown in figure 13).
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t73
title: "Table 73" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: $\eta/\pi^{0}$ ratio as a function of $p_{\rm T}$ for pp collisions at $\sqrt{s}$ = 13 TeV in INEL&gt;0 collisions in the V0M multiplicity class 10-20% (data points not shown in figure 13).
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.
DOI: 10.17182/hepdata.160597.v1/t74
title: "Table 74" of "Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV"

description: $\eta/\pi^{0}$ ratio as a function of $p_{\rm T}$ for pp collisions at $\sqrt{s}$ = 13 TeV in INEL&gt;0 collisions in the V0M multiplicity class 5-10% (data points not shown in figure 13).
description: The momentum-differential invariant cross sections of $\pi^{0}$ and $\eta$ mesons are reported for pp collisions at $\sqrt{s}$ = 13 TeV at midrapidity ($|y|$ $&lt;$ 0.8). The measurement is performed in a broad transverse-momentum range of 0.2 $&lt; p_{\rm T} &lt;$ 200 GeV/$c$ and 0.4 $&lt; p_{\rm T} &lt;$ 60 GeV/$c$ for the $\pi^{0}$ and $\eta$, respectively, extending the $\eta$ coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken $x$ ($\eta$) scaling of the $\pi^{0}$ cross sections at LHC energies is fulfilled with a power-law exponent of $n$ = 5.01$\pm$0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the $\pi^{0}$ spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the $\pi^{0}$ and are not able to describe the shape and magnitude of the $\eta$ spectrum. The charged-particle multiplicity dependent $\pi^{0}$ and $\eta$ $p_{\rm T}$ spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the $\eta/\pi^{0}$ ratio shows a dependence on the charged-particle multiplicity for $p_{\rm T}$ $&lt;$ 4 GeV/$c$, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the $\pi^{0}$ spectrum.