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Nuclear Theory·nucl-th

Monday·May 1, 2017

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 08

    [Submitted on 27 Apr 2017] (cross-list from hep-th)

    Fluid Dynamics far from Local Equilibrium

    Paul Romatschke🇺🇸

    Fluid dynamics is traditionally thought to apply only to systems near local equilibrium. In this case, the effective theory of fluid dynamics can be constructed as a gradient series. Recent applications of resurgence suggest that this gradient series diverges, but can be Borel-resummed, giving rise to a hydrodynamic attractor solution which is well defined even for large gradients. Arbitrary initial data quickly approaches this attractor via non-hydrodynamic mode decay. This suggests the existence of a new theory of far-from-equilibrium fluid dynamics. In this work, the framework of fluid dynamics far from local equilibrium for conformal system is introduced, and the hydrodynamic attractor solutions for rBRSSS, kinetic theory in the relaxation time approximation, and strongly-coupled N=4 SYM are identified for a system undergoing Bjorken flow.

    Comments:
    7 pages, 2 figures; v2: minor changes; v3: matches published version
    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Fluid Dynamics (physics.flu-dyn)
    arXiv:
    1704.08699 [pdf]
    PRL(2018)·264 citations
  2. 09

    [Submitted on 27 Apr 2017] (cross-list from hep-ph)

    Interpretation of as an isoscalar partner of from interaction

    Jun He🇨🇳 · Dian-Yong Chen🇨🇳

    Invoked by the recent observation of at BESIII, which is about 40 MeV below the threshold, we investigate possible bound and resonance states from the interaction with the one-boson-exchange model in a quasipotential Bethe-Salpeter equation approach. A bound state with quantum number is produced at 4384 MeV from the interaction, which can be related to experimentally observed . Another state with quantum number is also produced at MeV from this interaction. Different from the state, the state is a resonance state above the threshold. This resonance state can be related to the first observed charged charmonium-like state , which has a mass about 4475 MeV measured above the threshold as observed at Belle and LHCb. Our result suggests that is an isoscalar partner of the as a hadronic-molecular state from the interaction.

    Comments:
    5 pages, 1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1704.08776 [pdf]
    EPJC(2017)·19 citations
  3. 10

    [Submitted on 28 Apr 2017] (cross-list from hep-ph)

    Production and absorption of exotic bottomonium-like states in high energy heavy ion collisions

    L. M. Abreu🇧🇷 · K. P. Khemchandani🇧🇷 · A. Martínez Torres🇧🇷 · F. S. Navarra🇧🇷 · M. Nielsen🇧🇷 · A. L. Vasconcellos🇧🇷

    We investigate the production and absorption of and states in a hadronic medium, via the processes and the corresponding inverses reactions. We use effective field Lagrangians based on an -extension of the hidden gauge formalism to account for the couplings between light and heavy mesons, and a phenomenological Lagrangian involving the vertices. The absorption cross sections are found to be much larger than the production ones.

    Comments:
    8 pages; 13 figures; Version accepted for publication in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1704.08781 [pdf]
    PRD(2017)·11 citations
  4. 11

    [Submitted on 28 Apr 2017] (cross-list from physics.atom-ph)

    Effect of nuclear quadrupole moment on parity nonconservation in atoms

    V. V. Flambaum · V. A. Dzuba · C. Harabati

    Nuclei with spin have a weak quadrupole moment which leads to tensor contribution to the parity non-conserving interaction between nuclei and electrons. We calculate this contribution for Yb, Fr and Ra and found it to be small. In contrast, in many lanthanides (e.g., Nd, Gd, Dy, Ho, Er, Pr, Sm) and Ra close levels of opposite parity lead to strong enhancement of the effect making it sufficiently large to be measured. Another possibility is to measure the PNC transitions between the hyperfine components of the ground state of Bi. Since nuclear weak charge is dominated by neutrons this opens a way of measuring quadrupole moments of neutron distribution in nuclei.

    Comments:
    9 pages, 1 figure
    Subjects:
    Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th)
    arXiv:
    1704.08809 [pdf]
    PRA(2017)·15 citations
  5. 12

    [Submitted on 28 Apr 2017] (cross-list from hep-ph)

    Status and challenges of neutrino cross sections

    Marco Martini🇫🇷

    Neutrino oscillations physics entered in the precision era. In this context accelerator-based neutrino experiments need a reduction of systematic errors to the level of a few percent. Today one of the most important sources of systematic errors are the neutrino-nucleus cross sections. The status of our knowledge of these cross sections in the different open channels in the few-GeV region, i.e. the quasielastic, the pion production and the multinucleon emission, is reviewed. Special emphasis is devoted to the multinucleon emission channel, which attracted a lot of attention in the last few years. It is crucial to properly reconstruct the neutrino energy which enters the expression of the oscillation probability. This channel was not included in the generators used for the analyses of the neutrino cross sections and oscillations experiments.

    Comments:
    Talk presented at NuPhys2016 (London, 12-14 December 2016). 8 pages, LaTeX, 1 eps figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1704.08903 [pdf]
    0 citations

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first authorsco-authorsvia INSPIRE