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Nuclear Theory·nucl-th

Friday·August 23, 2019

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 05

    Optimal Control for the Quantum Simulation of Nuclear Dynamics

    Eric T. Holland🇺🇸 · Kyle A. Wendt🇺🇸 · Konstantinos Kravvaris🇺🇸 · Xian Wu🇺🇸 · W. Erich Ormand🇺🇸 · Jonathan L DuBois🇺🇸 · Sofia Quaglioni🇺🇸 · Francesco Pederiva🇮🇹

    We propose a method for enacting the unitary time propagation of two interacting neutrons at leading order of chiral effective field theory by efficiently encoding the nuclear dynamics into a single multi-level quantum device. The emulated output of the quantum simulation shows that, by applying a single gate that draws on the underlying characteristics of the device, it is possible to observe multiple cycles of the nucleons' dynamics before the onset of decoherence. Owing to the signal's longevity, we can then extract spectroscopic properties of the simulated nuclear system. This allows us to validate the encoding of the nuclear Hamiltonian and the robustness of the simulation in the presence of quantum-hardware noise by comparing the extracted spectroscopic information to exact calculations. This work paves the way for transformative calculations of dynamical properties of nuclei on near-term quantum devices.

    ↳ quant-phnucl-thPRA(2020)·52 citations
  2. 06

    Intrinsic three-body nuclear interaction from a constituent quark model

    Aaron Park🇰🇷 · Su Houng Lee🇰🇷

    We study the short distance part of the intrinsic three-nucleon interaction in a constituent quark model with color-spin interaction. For that purpose we first calculate the transformation coefficient between the tribaryon configuration and their corresponding three baryon basis. Using a formula for the intrinsic three-body interaction in terms of a tribaryon configuration, we find that after subtracting the corresponding two-baryon contributions, the intrinsic three-body interaction vanishes in flavor SU(3) symmetric limit for all quantum numbers for the three nucleon states. We further find that the intrinsic three-body interaction also vanishes for flavor-spin type of quark interaction.

    ↳ hep-phnucl-thPRC(2019)·6 citations
  3. 07

    Renormalization group improved pressure for cold and dense QCD

    Jean-Loïc Kneur🇫🇷 · Marcus Benghi Pinto🇧🇷 · Tulio Eduardo Restrepo🇧🇷

    We apply the renormalization group optimized perturbation theory (RGOPT)to evaluate the QCD (matter) pressure at the two-loop level considering three flavors of massless quarks in a dense and cold medium. Already at leading order (), which builds on the simple one loop (RG resummed) term, our technique provides a non-trivial non-perturbative approximation which is completely renormalization group invariant. At the next-to-leading order the comparison between the RGOPT and the pQCD predictions shows that the former method provides results which are in better agreement with the state-of-the-art perturbative results, which include a contribution of order . At the same time one also observes that the RGOPT predictions are less sensitive to variations of the arbitrary renormalization scale than those obtained with pQCD. These results indicate that the RGOPT provides an efficient resummation scheme which may be considered as an alternative to lattice simulations at high baryonic densities.

    ↳ hep-phhep-thnucl-thPRD(2019)·20 citations
  4. 08

    Thermal Broadening of Bottomonia: Lattice Non-Relativistic QCD with Extended Operators

    Rasmus Larsen🇺🇸 · Stefan Meinel🇺🇸 · Swagato Mukherjee🇺🇸 · Peter Petreczky🇺🇸

    We present lattice non-relativistic QCD calculations of bottomonium correlation functions at temperatures MeV. The correlation functions were computed using extended bottomonium operators, and on background gauge-field configurations for 2+1-flavor QCD having physical kaon and nearly-physical pion masses. We analyzed these correlation functions based on simple theoretically-motivated parameterizations of the corresponding spectral functions. The results of our analyses are compatible with significant in-medium thermal broadening of the ground state S- and P-wave bottomonia.

    ↳ hep-lathep-phnucl-thPRD(2019)·69 citations
  5. 09

    Nucleon-antinucleon annihilation at LEAR

    Claude Amsler🇦🇹

    This report is a historical review of the salient results in low energy antiproton-proton and antineutron-proton annihilation obtained at the Low Energy Antiproton Ring (LEAR), which was operated at CERN between 1983 and 1996. The intention is to provide guidelines for future experiments at the CERN AD/ELENA complex and elsewhere. In the spirit of this workshop, hadron spectroscopy - one of the cornerstones at LEAR - is briefly mentioned, while emphasis is put on the annihilation mechanism on one and two nucleons, the final state multiplicity distributions and the contributions from quarks, in particular in annihilation channels involving strangeness.

    ↳ hep-phnucl-exnucl-th17 citations

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first authorsco-authorsvia INSPIRE