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Nuclear Theory·nucl-th

Monday·November 21, 2016

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    [Submitted on 18 Nov 2016]

    Two Photon Transition Form Factor of Quarkonia

    Jing Chen🇨🇳 · Minghui Ding🇨🇳 · Lei Chang🇨🇳 · Yu-xin Liu🇨🇳

    The two photon transition of quarkonia are studied within a covariant approach based on the consistent truncation scheme of the quantum chromodynamics Dyson-Schwinger equation for the quark propagator and the Bethe--Salpeter equation for the mesons. We find the decay widths of and in good agreement with experimental data. The obtained transition form factor of for a wide range of space-like photon momentum transfer squared is also in agreement with the experimental findings of the BABAR experiment. As a by-product, the decay widths of and the transition form factor of are predicted, which await for experimental test.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1611.05960 [pdf]
    PRD(2017)·43 citations
  2. 02

    [Submitted on 18 Nov 2016]

    Description of the LiLi transfer reaction using structure overlaps from a full three-body model

    J. Casal · M. Gómez-Ramos · A. M. Moro

    Recent data on the differential angular distribution for the transfer reaction Li(p,d)Li at MeV in inverse kinematics are analysed within the DWBA reaction framework, using the overlap functions calculated within a three-body model of Li. The weight of the different Li configurations in the system's ground state is obtained from the structure calculations unambiguously. The effect of the Li spin in the calculated observables is also investigated. We find that, although all the considered models succeed in reproducing the shape of the data, the magnitude is very sensitive to the content of wave in the Li ground-state wave function. Among the considered models, the best agreement with the data is obtained when the Li ground state contains a 31\% of wave in the -Li subsystem. Although this model takes into account explicitly the splitting of the and resonances due to the coupling of the wave to the spin of the core, a similar degree of agreement can be achieved with a model in which the Li spin is ignored, provided that it contains a similar p-wave content.

    Comments:
    8 pages, 3 figures. Final version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1611.06000 [pdf]
    PLB(2017)·25 citations
  3. 03

    [Submitted on 18 Nov 2016]

    Renormalization of the three-boson system with short-range interactions revisited

    E. Epelbaum🇩🇪 · J. Gegelia🇩🇪 · Ulf-G. Meißner🇩🇪 · De-Liang Yao🇩🇪

    We consider renormalization of the three-body scattering problem in low-energy effective field theory of self-interacting scalar particles by applying time-ordered perturbation theory to the manifestly Lorentz-invariant formulation. The obtained leading-order equation is perturbatively renormalizable and non-perturbatively finite and does not require a three-body counter term in contrast to its non-relativistic approximation.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1611.06040 [pdf]
    EPJA(2017)·19 citations
  4. 04

    [Submitted on 17 Nov 2016]

    In-Medium Pion Valence Distribution Amplitude

    K. Tsushima (Cruzeiro do Sul U.)🇧🇷 · J. P. B. C de Melo (Cruzeiro do Sul U.)🇧🇷

    After a brief review of the quark-based model for nuclear matter, and some pion properties in medium presented in our previous works, we report new results for the pion valence wave function as well as the valence distribution amplitude in medium, which are presented in our recent article. We find that both the in-medium pion valence distribution and the in-medium pion valence wave function, are substantially modified at normal nuclear matter density, due to the reduction in the pion decay constant.

    Comments:
    9 pages, 10 figures, one paragraph added, typos corrected, to be published in the proceedings of "Light Cone 2016", September 5-8, 2016, Lisbon, Portugal
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1611.06124 [pdf]
    Few Body Syst.(2017)·3 citations
  5. 05

    [Submitted on 18 Nov 2016]

    Two-photon exchange correction to - splitting in muonic helium-3 ions

    Carl E. Carlson🇺🇸 · Mikhail Gorchtein🇩🇪 · Marc Vanderhaeghen🇩🇪

    We calculate the two-photon exchange correction to the Lamb shift in muonic helium-3 ions within the dispersion relations framework. Part of the effort entailed making analytic fits to the electron-He quasielastic scattering data set, for purposes of doing the dispersion integrals. Our result is that the energy of the 2 state is shifted downwards by two-photon exchange effects by 15.14(49) meV, in good accord with the result obtained from a potential model and effective field theory calculation.

    Comments:
    10 pages, 4 figures, 2 tables; version submitted to Phys. Rev. A
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1611.06192 [pdf]
    PRA(2017)·37 citations

Affiliations

first authorsco-authorsvia INSPIRE