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The Photon Content of the Neutron
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abstract
In this work, we complete our CT18qed study with the neutron's photon parton distribution function (PDF), which is essential for the nucleus scattering phenomenology. Two methods, CT18lux and CT18qed, based on the LUXqed formalism and the DGLAP evolution, respectively, to determine the neutron's photon PDF have been presented. Various low-$Q^2$ non-perturbative variations have been carefully examined, which are treated as additional uncertainties on top of those induced by quark and gluon PDFs. The impacts of the momentum sum rule as well as isospin symmetry violation have been explored, and turn out to be negligible. A detailed comparison with other neutron's photon PDF sets has been performed, which shows a great improvement in the precision and a reasonable uncertainty estimation in our results. Finally, two phenomenological implications are demonstrated with photon-initiated processes: neutrino-nucleus $W$-boson production, which is important for the near-future TeV--PeV neutrino observations, and the axion-like particle production at a high-energy muon beam-dump experiment.
Forward citations
Cited by 2 Pith papers
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QED-enhanced PDF implications for the Higgs sector
Modern LUX-based photon PDFs in CT, MSHT and NNPDF produce consistent QED corrections to Higgs production, with a residual 3-4% spread dominated by baseline QCD PDF differences.
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A review of collider neutrino experiments, covering first FASERv and SND@LHC measurements, FPF prospects for neutrino cross sections, new physics searches, and astrophysics applications.
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