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Nuclear Theory·nucl-th

Wednesday·November 2, 2016

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 06

    Tracing the pressure of the gluon plasma

    G. Jackson🇿🇦 · A. Peshier🇿🇦

    Being interested in how a strongly coupled system approaches asymptotic freedom, we re-examine existing precision lattice QCD results for thermodynamic properties of the gluon plasma in a large temperature range. We discuss and thoroughly test the applicability of perturbative results, on which grounds we then infer that the pressure and other bulk properties approach the free limit somewhat slower than previously thought. We also revise the value of the first non-perturbative coefficient in the weak-coupling expansion.

    ↳ hep-phhep-latnucl-thPRD(2017)·1 citation
  2. 07

    Efimov Physics: a review

    Pascal Naidon🇯🇵 · Shimpei Endo🇦🇺

    This article reviews theoretical and experimental advances in Efimov physics, an array of quantum few-body and many-body phenomena arising for particles interacting via short-range resonant interactions, that is based on the appearance of a scale-invariant three-body attraction theoretically discovered by Vitaly Efimov in 1970. This three-body effect was originally proposed to explain the binding of nuclei such as the triton and the Hoyle state of carbon-12, and later considered as a simple explanation for the existence of some halo nuclei. It was subsequently evidenced in trapped ultra-cold atomic clouds and in diffracted molecular beams of gaseous helium. These experiments revealed that the previously undetermined three-body parameter introduced in the Efimov theory to stabilise the three-body attraction typically scales with the range of atomic interactions. The few- and many-body consequences of the Efimov attraction have been since investigated theoretically, and are expected to be observed in a broader spectrum of physical systems.

    ↳ quant-phcond-mat.quant-gasnucl-thphysics.atom-phRept.Prog.Phys.(2017)·348 citations
  3. 08

    A chiral covariant approach to scattering

    D. Gülmez🇩🇪 · U.-G. Meißner🇩🇪 · J. A. Oller🇪🇸

    We analyze vector meson - vector meson scattering in a unitarized chiral theory based on a chiral covariant framework. We show that a pole assigned to the the scalar meson can be dynamically generated from the interaction, while this is not the case for the tensor meson as found in earlier works. We show that the generation of the tensor state is untenable due to an artefact of the extreme non-relativistic kinematics used before. We further consider the effects arising from the coupling of channels with different orbital angular momenta. We suggest to use the formalism outlined here to obtain more reliable results for the dynamical generation of resonances in the vector-vector interaction.

    ↳ hep-phhep-latnucl-thEPJC(2017)·64 citations
  4. 09

    Collectivity in small collision systems : an initial state perspective

    Sören Schlichting🇺🇸 · Prithwish Tribedy🇺🇸

    Measurements of multi-particle correlations in the collisions of small systems such as , show striking similarity to the observations in heavy ion collisions. A number of observables measured in the high multiplicity events of these systems resemble features that are attributed to collectivity driven by hydrodynamics. However alternative explanations based on initial state dynamics are able to describe many characteristic features of these measurements. In this brief review we highlight some of the recent developments and outstanding issues in this direction.

    ↳ hep-phnucl-exnucl-thAdv.High Energy Phys.(2016)·96 citations
  5. 10

    Axial-Current Matrix Elements in Light Nuclei from Lattice QCD

    Martin J. Savage🇺🇸 · Phiala E. Shanahan🇺🇸 · Brian C. Tiburzi🇺🇸 · Michael L. Wagman🇺🇸 · Frank Winter🇺🇸 · Silas R. Beane🇺🇸 · Emmanuel Chang🇺🇸 · Zohreh Davoudi🇺🇸 · William Detmold🇺🇸 · Kostas Orginos🇺🇸

    I present results from the first lattice QCD calculations of axial-current matrix elements in light nuclei, performed by the NPLQCD collaboration. Precision calculations of these matrix elements, and the subsequent extraction of multi-nucleon axial-current operators, are essential in refining theoretical predictions of the proton-proton fusion cross section, neutrino-nucleus cross sections and -decay rates of nuclei. In addition, they are expected to shed light on the phenomenological quenching of that is required in nuclear many-body calculations.

    ↳ hep-lathep-phnucl-thPoS(2016)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE