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Neutron-skin effect in direct-photon and charged-hadron production in Pb+Pb collisions at the LHC. | LitMetric

Neutron-skin effect in direct-photon and charged-hadron production in Pb+Pb collisions at the LHC.

Eur Phys J C Part Fields

University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 University of Jyvaskyla, Finland.

Published: March 2017

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-[Formula: see text] 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-[Formula: see text] hadrons, even centrality-dependent nuclear-PDF effects cancel, making this observable a better handle on the neutron skin. Up to 10% effects can be expected for the most peripheral collisions in the measurable region.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5347519PMC
http://dx.doi.org/10.1140/epjc/s10052-017-4709-9DOI Listing

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