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Nuclear Theory·nucl-th

Monday·March 21, 2016

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 17 Mar 2016] (cross-list from hep-ph)

    General considerations on the nature of and from their pole positions

    Xian-Wei Kang🇪🇸 · Zhi-Hui Guo🇩🇪 · J. A. Oller🇪🇸

    The nature of the bottomonium-like states and is studied by calculating the compositeness () in those resonances. We first consider uncoupled isovector -wave scattering of within the framework of effective-range expansion (ERE). Expressions for the scattering length () and effective range () are derived exclusively in terms of the masses and widths of the two states. We then develop compositeness within ERE for the resonance case and deduce the expression , which is then applied to the systems of interest. Finally, the actual compositeness parameters are calculated in terms of resonance pole positions and their experimental branching ratios into by using the method of Ref.[1]. We find the values and for the and , respectively. We also compare the ERE with Breit-Wigner and Flatté parameterizations to discuss the applicability of the last two ones for near-threshold resonances with explicit examples.

    Comments:
    15 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:
    1603.05546 [pdf]
    PRD(2016)·73 citations
  2. 05

    [Submitted on 18 Mar 2016] (cross-list from physics.atom-ph)

    Enhanced violation of the Lorentz invariance and Einstein's equivalence principle in nuclei and atoms

    V.V. Flambaum🇦🇺

    Local Lorentz Invariance violating (LLIV) and Einstein equivalence principle violating (EEPV) effects in atomic experiments are discussed. The EEPV effects are strongly enhanced in the narrow 7.8 eV transition in 229Th nucleus. Nuclear LLIV momentum tensors describing anisotropy in the maximal attainable speed for massive particles (analog of Michelson-Morley experiment for light) are expressed in terms of the experimental values of nuclear quadrupole moments. Calculations for nuclei of experimental interest 133Cs, 85Rb, 87Rb, 201Hg, 131Xe and 21Ne have been performed. The results for 21Ne are used to improve the limits on the proton LLIV constants by 4 orders of magnitude.

    Comments:
    Added: proposal to measure quadrupole moments of the neutron distribution using parity violation in molecules arXiv admin note: text overlap with arXiv:1511.04848
    Subjects:
    Atomic Physics (physics.atom-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1603.05753 [pdf]
    PRL(2016)·55 citations
  3. 06

    [Submitted on 18 Mar 2016] (cross-list from astro-ph.SR)

    Strange quark matter and quark stars with the Dyson-Schwinger quark model

    H. Chen🇨🇳 · J.-B Wei🇨🇳 · H.-J. Schulze🇮🇹

    We calculate the equation of state of strange quark matter and the interior structure of strange quark stars in a Dyson-Schwinger quark model within rainbow or Ball-Chiu vertex approximation. We emphasize constraints on the parameter space of the model due to stability conditions of ordinary nuclear matter. Respecting these constraints, we find that the maximum mass of strange quark stars is about 1.9 solar masses, and typical radii are 9 --11 km. We obtain an energy release as large as from conversion of neutron stars into strange quark stars.

    Comments:
    9 pages, 9 figures
    Subjects:
    Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1603.05755 [pdf]
    EPJA(2016)·24 citations
  4. 07

    [Submitted on 18 Mar 2016] (cross-list from cond-mat.quant-gas)

    Matching universal behavior with potential models

    R. Álvarez-Rodríguez · A. Deltuva. M. Gattobigio · A. Kievsky

    Two-, three-, and four-boson systems are studied close to the unitary limit using potential models constructed to reproduce the minimal information given by the two-body scattering length and the two-body binding energy or virtual state energy . The particular path used to reach the unitary limit is given by varying the potential strength. In this way the energy spectrum in the three- and four-boson systems is computed. The lowest energy states show finite-range effects absorbed in the construction of level functions that can be used to study real systems. Higher energy levels are free from finite-range effects, therefore the corresponding level functions tend to the zero-range universal function. Using this property a zero-range equation for the four-boson system is proposed and the four-boson universal function is computed.

    Comments:
    8 pages, 4 figures
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    1603.05878 [pdf]
    PRA(2016)·21 citations

Affiliations

first authorsco-authorsvia INSPIRE