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Nuclear Theory·nucl-th

Monday·July 3, 2017

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 01

    [Submitted on 30 Jun 2017]

    Relativistic Three-Dimensional Lippmann-Schwinger Cross Sections for Space Radiation Applications

    C. M. Werneth · X. Xu · R. B. Norman · K. M. Maung

    Radiation transport codes require accurate nuclear cross sections to compute particle fluences inside shielding materials. The Tripathi semi-empirical reaction cross section, which includes over 60 parameters tuned to nucleon-nucleus (NA) and nucleus-nucleus (AA) data, has been used in many of the world's best-known transport codes. Although this parameterization fits well to reaction cross section data, the predictive capability of any parameterization is questionable when it is used beyond the range of the data to which it was tuned. Using uncertainty analysis, it is shown that a relativistic Three-Dimensional Lippmann-Schwinger (LS3D) equation model based on Multiple Scattering Theory (MST) that uses 5 parameterizations---3 fundamental parameterizations to nucleon-nucleon (NN) data and 2 nuclear charge density parameterizations---predicts NA and AA reaction cross sections as well as the Tripathi cross section parameterization for reactions in which the kinetic energy of the projectile in the laboratory frame () is greater than 220 MeV/n. The relativistic LS3D model has the additional advantage of being able to predict highly accurate total and elastic cross sections. Consequently, it is recommended that the relativistic LS3D model be used for space radiation applications in which 220 MeV/n.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1706.10232 [pdf]
    Nucl.Instrum.Meth.B(2017)·1 citation
  2. 02

    [Submitted on 15 Jun 2017] (cross-list from hep-ph)

    The ridge effect and three-particle correlations

    Miguel-Angel Sanchis-Lozano🇪🇸 · Edward Sarkisyan-Grinbaum🇨🇭

    Pseudorapidity and azimuthal three-particle correlations are studied based on a correlated-cluster model of multiparticle production. The model provides a common framework for correlations in proton-proton and heavy-ion collisions allowing easy comparison with the measurements. It is shown that azimuthal cluster correlations are definitely required in order to understand three-particle correlations in the near-side ridge effect. This is similar to the explanation of the ridge phenomenon found in our previous analysis of two-particle correlations and generalizes the model to higher-order correlations.

    Comments:
    16 pages, 7 figures. arXiv admin note: text overlap with arXiv:1610.06408
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1706.05231 [pdf]
    PRD(2017)·13 citations
  3. 03

    [Submitted on 30 Jun 2017] (cross-list from hep-th)

    Triviality of quantum electrodynamics revisited

    D. Djukanovic🇩🇪 · J. Gegelia🇩🇪 · Ulf-G. Meißner🇩🇪

    Quantum electrodynamics is considered to be a trivial theory. This is based on a number of evidences, both numerical and analytical. One of the strong indications for triviality of QED is the existence of the Landau pole for the running coupling. We show that by treating QED as the leading order approximation of an effective field theory and including the next-to-leading order corrections, the Landau pole is removed. Therefore, we conclude that the conjecture, that for reasons of self-consistency, QED needs to be trivial is a mere artefact of the leading order approximation to the corresponding effective field theory.

    Comments:
    3 pages, 2 figures
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1706.10039 [pdf]
    Commun.Theor.Phys.(2018)·15 citations
  4. 04

    [Submitted on 30 Jun 2017] (cross-list from hep-ph)

    A new method to study the number of colors in the final-state interactions of hadrons

    Ling-Yun Dai🇩🇪 · Ulf-G. Meißner🇩🇪

    We match the scattering amplitudes of Chiral Perturbation Theory with those from dispersion relations that respect analyticity and coupled channel unitarity, as well as accurately describing experiment. Their dependence on the number of colors () is obtained. By varying the trajectories of the poles and residues (the couplings to ) of light mesons, the , , and are investigated. Our results show that the method proposed is a reliable way to study the dependence in hadron-hadron scattering with final-state interactions.

    Comments:
    7 pages, 3 figures, improved behaviour
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1706.10123 [pdf]
    PLB(2018)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE