Regge Poles in QCD and Heavy-Ion Collisions

Kaǐdalov, A. B.

doi:10.1007/978-94-010-0267-7_5

Cited by 1 publication

(1 citation statement)

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“…This reduction is dependent on the nuclear mass, and has been successfully understood within the Vector Meson Dominance model (VMD), which describes the photon's wave function as a superposition of mesonic states (ρ, ω, ϕ) [48,49,59] that interact hadronically with the nucleus. At higher energies, where the photon can resolve the partons in the nucleus, the parton distribution function is predicted to be high enough that the nucleus becomes opaque to photons, leading to a theoretical limit similar to that of hadron-nucleus interactions α lim = 2/3 [50]. The mass scaling is typically parametrized in the literature as a power of the nuclear mass:…”

Section: Jcap11(2019)007mentioning

confidence: 99%

Improved photomeson model for interactions of cosmic ray nuclei

Morejón¹,

Fedynitch²,

Boncioli³

et al. 2019

J. Cosmol. Astropart. Phys.

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Photon-hadronic interactions are important for the sources and the transport of Ultra-High Energy Cosmic Rays (UHECRs). Current state-of-the-art cosmic ray transport simulations handle nuclear disintegration at energies of the Giant Dipole Resonance at a more sophisticated level, as well as the photohadronic interactions of nucleons in the high-energy regime above the pion production threshold. However, the interactions of nuclei above the pion production threshold are commonly modeled by treating the nucleus as a superposition of free nucleons -ignoring the effect of the nuclear medium. We construct an improved, inclusive model for the photomeson regime for nuclei with A ≤ 56 by employing more accurate, data-driven parametrizations of the interaction cross section, the fragmentation of the primary nucleus and the inclusive pion production cross section that directly affects the production of astrophysical neutrinos. We apply our results to two multi-messenger scenarios (Tidal Disruption Events and Gamma-Ray Bursts) in which photonuclear interactions in the photomeson regime are the dominant cooling process for the highest energy cosmic rays. While we find moderate changes to the mass composition of UHECRs, the astrophysical neutrino fluxes exhibit a significant (factor of a few) reduction compared to the naïve superposition of free nucleons for sources of UHECR nuclei with a populated cascade. The numerical code implementing the model has been made publicly available, which facilitates the integration of our results in similar frameworks.

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Section: Jcap11(2019)007mentioning

confidence: 99%