The photon content of the neutron

Xie, Keping; Zhou, Bei; Hobbs, T. J.

doi:10.1007/jhep04(2024)022

Title: The photon content of the neutron

Journal Article · 03 April 2024 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep04(2024)022 · OSTI ID:2476023

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Univ. of Pittsburgh, PA (United States); Michigan State Univ., East Lansing, MI (United States)
Johns Hopkins Univ., Baltimore, MD (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)

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-Q² 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 turned 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. 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); Simons Foundation; USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-06CH11357; SC0007914

OSTI ID:: 2476023

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 4 Vol. 2024; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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