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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
  3. 03

    [Submitted on 27 Feb 2015] (cross-list from hep-ph)

    Chiral Thermodynamics with Charm

    Chihiro Sasaki🇩🇪

    Chiral thermodynamics of charmed mesons is formulated at finite temperature within a -flavored effective Lagrangian incorporating heavy quark symmetry. The chiral mass splittings are shown to be less sensitive to the light-quark flavors, attributed to the underlying heavy quark symmetry. Consequently, chiral symmetry restoration is more accelerated in the strange charmed-mesons than in the strange light mesons, and this is in striking contrast to the chiral SU(4) result. We also show the correlations between light and heavy flavors around the chiral crossover.

    Comments:
    5 pages, 2 figures, to appear in the proceedings for the international conference on "Critical Point and Onset of Deconfinement", Nov 17-21 2014, Bielefeld, Germany
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1502.07911 [pdf]
    PoS(2015)·0 citations
  4. 04

    [Submitted on 27 Feb 2015] (cross-list from hep-th)

    Linearly resummed hydrodynamics in a weakly curved spacetime

    Yanyan Bu🇮🇱 · Michael Lublinsky🇮🇱

    We extend our study of all-order linearly resummed hydrodynamics in a flat space~\cite{1406.7222,1409.3095} to fluids in weakly curved spaces. The underlying microscopic theory is a finite temperature super-Yang-Mills theory at strong coupling. The AdS/CFT correspondence relates black brane solutions of the Einstein gravity in asymptotically \emph{locally} geometry to relativistic conformal fluids in a weakly curved 4D background. To linear order in the amplitude of hydrodynamic variables and metric perturbations, the fluid's energy-momentum tensor is computed with derivatives of both the fluid velocity and background metric resummed to all orders. We extensively discuss the meaning of all order hydrodynamics by expressing it in terms of the memory function formalism, which is also suitable for practical simulations. In addition to two viscosity functions discussed at length in refs.~\cite{1406.7222,1409.3095}, we find four curvature induced structures coupled to the fluid via new transport coefficient functions. In ref.~\cite{0905.4069}, the latter were referred to as gravitational susceptibilities of the fluid. We analytically compute these coefficients in the hydrodynamic limit, and then numerically up to large values of momenta.

    Comments:
    24 pages + appendices, 1 table, 6 muti-figures
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1502.08044 [pdf]
    JHEP(2015)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE