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Nuclear Theory·nucl-th

Monday·March 2, 2015

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    [Submitted on 26 Feb 2015]

    The reaction in coupled channel chiral models up to next-to-leading order

    A. Feijoo🇪🇸 · V. K. Magas🇪🇸 · A. Ramos🇪🇸

    The meson-baryon interaction in s-wave in the strangeness S=-1 sector has been studied, employing a chiral SU(3) Lagrangian up to next-to-leading order (NLO) and implementing unitarization in coupled channels. The parameters of the Lagrangian have been fitted to a large set of experimental data in different two-body channels, paying special attention to the reaction, which is particularly sensitive to the NLO terms. With the aim of improving the model in the production channels, effects of the high spin hyperon resonances and have been taken into account phenomenologically.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1502.07956 [pdf]
    PRC(2015)·45 citations
  2. 02

    [Submitted on 27 Feb 2015]

    Pion Production in High-Energy Neutrino Reactions with Nuclei

    Ulrich Mosel🇩🇪

    [Background] A quantitative understanding of neutrino interactions with nuclei is needed for precision era neutrino long baseline experiments (MINOS, NOvA, DUNE) which all use nuclear targets. Pion production is the dominant reaction channel at the energies of these experiments. [Purpose] Investigate the influence of nuclear effects on neutrino-induced pion production cross sections and compare predictions for pion-production with available data. [Method] The Giessen Boltzmann--Uehling--Uhlenbeck (GiBUU) model is used for the description of all incohrent channels in neutrino-nucleus reactions. [Results] Differential cross sections for charged and neutral pion production for the MINERA neutrino and antineutrino flux are calculated. An estimate for the coherent cross section is obtained from a comparison of data with theoretical results. The invariant mass () distribution of the resonances produced is analyzed. [Conclusions] Final state interactions affect the pion kinetic energy spectra significantly. The data for charged pion production at MINERA are compatible with the results of calculations using elementary data taken from an old Argonne National Laboratory experiment. Remaining differences can be attributed to coherent production; the data for antineutrino induced neutral pion production, where no coherent contribution is present, are reproduced quite well. In contrast, the MiniBooNE data, taken at a lower energy, are consistently higher than the theoretical description. The analysis of -distributions shows that experimental cuts on this quantity lead to shape distortions for nuclear targets.

    Comments:
    Version accepted for publication in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1502.08032 [pdf]
    PRC(2015)·26 citations

Affiliations

first authorsco-authorsvia INSPIRE