Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutron-skin effect in direct-photon and charged hadron-production in
  Pb+Pb collisions at the LHC   A well-established observation in nuclear physics is that in neutron-rich
spherical nuclei the distribution of neutrons extends farther than the
distribution of protons. In this work, we scrutinize the influence of this so
called neutron-skin effect on the centrality dependence of high-$p_{\rm T}$
direct-photon and charged-hadron production. We find that due to the estimated
spatial dependence of the nuclear parton distribution functions, it will be
demanding to unambiguously expose the neutron-skin effect with direct photons.
However, when taking a ratio between the cross sections for negatively and
positively charged high-$p_{\rm T}$ hadrons, even centrality-dependent
nuclear-PDF effects cancel, making this observable a better handle on the
neutron skin. Up to 20~\% effects can be expected for the most peripheral
collisions.

21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
18
The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph