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Neutron-skin effect and centrality dependence of high-pT observables in nuclear collisions

Helenius, Ilkka LU ; Paukkunen, Hannu and Eskola, Kari J. (2016) In Proceedings of Science 11-15-April-2016.
Abstract

We report on our studies of the neutron-skin effects in high-pT observables at the LHC. We study the impact of the neutron-skin effect on the centrality dependence of inclusive direct photon, highpT hadron and W± production in nuclear collisions at the LHC. The neutron-skin effect refers to the observation that in spherical heavy nuclei, the tail of the neutron distribution extends farther than the distribution of protons, which can affect observables sensitive to electroweak phenomena in very peripheral collisions. We quantify this effect for direct photons, charged hadrons and W bosons as a function of the collision centrality. In the case of direct photons we find that it will be difficult to resolve the neutron-skin effect, given... (More)

We report on our studies of the neutron-skin effects in high-pT observables at the LHC. We study the impact of the neutron-skin effect on the centrality dependence of inclusive direct photon, highpT hadron and W± production in nuclear collisions at the LHC. The neutron-skin effect refers to the observation that in spherical heavy nuclei, the tail of the neutron distribution extends farther than the distribution of protons, which can affect observables sensitive to electroweak phenomena in very peripheral collisions. We quantify this effect for direct photons, charged hadrons and W bosons as a function of the collision centrality. In the case of direct photons we find that it will be difficult to resolve the neutron-skin effect, given the uncertainties in the nuclear PDFs and their spatial dependence. With charged hadrons and W's, however, up to 20 % unambiguous effects are expected for most peripheral collisions.

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Contribution to journal
publication status
published
subject
in
Proceedings of Science
volume
11-15-April-2016
publisher
Sissa Medialab srl
external identifiers
  • scopus:85006856350
ISSN
1824-8039
language
English
LU publication?
yes
id
928aa1ec-6f1b-4357-96ca-875d88095423
alternative location
http://hdl.handle.net/10138/174156
date added to LUP
2017-02-21 14:20:18
date last changed
2024-01-13 15:04:25
@article{928aa1ec-6f1b-4357-96ca-875d88095423,
  abstract     = {{<p>We report on our studies of the neutron-skin effects in high-pT observables at the LHC. We study the impact of the neutron-skin effect on the centrality dependence of inclusive direct photon, highpT hadron and W± production in nuclear collisions at the LHC. The neutron-skin effect refers to the observation that in spherical heavy nuclei, the tail of the neutron distribution extends farther than the distribution of protons, which can affect observables sensitive to electroweak phenomena in very peripheral collisions. We quantify this effect for direct photons, charged hadrons and W bosons as a function of the collision centrality. In the case of direct photons we find that it will be difficult to resolve the neutron-skin effect, given the uncertainties in the nuclear PDFs and their spatial dependence. With charged hadrons and W's, however, up to 20 % unambiguous effects are expected for most peripheral collisions.</p>}},
  author       = {{Helenius, Ilkka and Paukkunen, Hannu and Eskola, Kari J.}},
  issn         = {{1824-8039}},
  language     = {{eng}},
  publisher    = {{Sissa Medialab srl}},
  series       = {{Proceedings of Science}},
  title        = {{Neutron-skin effect and centrality dependence of high-pT observables in nuclear collisions}},
  url          = {{http://hdl.handle.net/10138/174156}},
  volume       = {{11-15-April-2016}},
  year         = {{2016}},
}