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Nuclear Theory·nucl-th

Friday·December 14, 2018

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 12 Dec 2018]

    Distribution Amplitudes of Heavy-Light Mesons

    Daniele Binosi🇮🇹 · Lei Chang🇨🇳 · Minghui Ding🇮🇹 · Fei Gao🇪🇸 · Joannis Papavassiliou🇪🇸 · Craig D. Roberts🇺🇸

    A symmetry-preserving approach to the continuum bound-state problem in quantum field theory is used to calculate the masses, leptonic decay constants and light-front distribution amplitudes of empirically accessible heavy-light mesons. The inverse moment of the -meson distribution is particularly important in treatments of exclusive -decays using effective field theory and the factorisation formalism; and its value is therefore computed: GeV. As an example and in anticipation of precision measurements at new-generation -factories, the branching fraction for the rare radiative decay is also calculated, retaining and corrections to the differential decay width, with the result on GeV.

    Comments:
    6 pages, 6 figure, 5 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1812.05112 [pdf]
    PLB(2019)·52 citations
  2. 02

    [Submitted on 12 Dec 2018]

    Suppression of light nuclei production in collisions of small systems at the Large Hadron Collider

    Kai-Jia Sun🇺🇸 · Che Ming Ko🇺🇸 · Benjamin Dönigus🇩🇪

    We show that the recently observed suppression of the yield ratio of deuteron to proton and of helium-3 to proton in p+p collisions compared to those in p+Pb or Pb+Pb collisions by the ALICE Collaboration at the Large Hadron Collider (LHC) can be explained if light nuclei are produced from the coalescence of nucleons at the kinetic freeze-out of these collisions. This suppression is attributed to the non-negligible sizes of deuteron and helium-3 compared to the size of the nucleon emission source in collisions of small systems, which reduces the overlap of their internal wave functions with those of nucleons. The same model is also used to study the production of triton and hypertriton in heavy-ion collisions at the LHC. Compared to helium-3 in events of low charged particle multiplicity, the triton is less suppressed due to its smaller size and the hypertriton is even more suppressed as a result of its much larger size.

    Comments:
    6 pages and 2 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1812.05175 [pdf]
    PLB(2019)·129 citations
  3. 03

    [Submitted on 12 Dec 2018]

    Two-neutron transfer reactions and shape phase transitions in the microscopically-formulated interacting boson model

    K. Nomura · Y. Zhang

    Two-neutron transfer reactions are studied within the interacting boson model based on the nuclear energy density functional theory. Constrained self-consistent mean-field calculations with the Skyrme energy density functional are performed to provide microscopic input to completely determine the Hamiltonian of the IBM. Spectroscopic properties are calculated only from the nucleonic degrees of freedom. This method is applied to study the and transfer reactions in the assorted set of rare-earth nuclei Sm, Gd, and Dy, where spherical-to-axially-deformed shape phase transition is suggested to occur at the neutron number . The results are compared with those from the purely phenomenological IBM calculations, as well as with the available experimental data. The calculated and transfer reaction intensities, from both the microscopic and phenomenological IBM frameworks, signal the rapid nuclear structural change at particular nucleon numbers.

    Comments:
    12 pages, 12 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1812.05197 [pdf]
    PRC(2019)·16 citations
  4. 04

    [Submitted on 13 Dec 2018]

    The unitarity expansion for light nuclei

    Sebastian König

    I is argued here that (at least light) nuclei may reside in a sweet spot: bound weakly enough to be insensitive to the details of the interaction, but dense enough to be insensitive to the exact values of the large two-body scattering lengths as well. In this scenario, a systematic expansion of nuclear observables around the unitarity limit converges. In particular, in this scheme the nuclear force is constructed such that the gross features of states in the nuclear chart are determined by a very simple leading-order interaction, whereas---much like the fine structure of atomic spectra---observables are moved to their physical values by small perturbative corrections. Explicit evidence in favor of this conjecture is shown for the binding energies of three and four nucleons.

    Comments:
    10 pages, 3 figures. Contribution to proceedings of the XXII International Conference on Few-Body Problems in Physics (FB22) in Caen, France, July 2018
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.05327 [pdf]
    Springer Proc.Phys.(2020)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE