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Nuclear Theory·nucl-th

Monday·November 14, 2016

12 papers—8 primary·4 cross-listed

All12Primary8Cross-lists4
  1. 09

    [Submitted on 11 Nov 2016] (cross-list from hep-lat)

    Gluon and Ghost Dynamics from Lattice QCD

    O. Oliveira🇵🇹 · A. G. Duarte🇵🇹 · D. Dudal🇧🇪 · P. J. Silva🇵🇹

    The two point gluon and ghost correlation functions and the three gluon vertex are investigated, in the Landau gauge, using lattice simulations. For the two point functions, we discuss the approach to the continuum limit looking at the dependence on the lattice spacing and volume. The analytical structure of the propagators is also investigated by computing the corresponding spectral functions using an implementation of the Tikhonov regularisation to solve the integral equation. For the three point function we report results when the momentum of one of the gluon lines is set to zero and discuss its implications.

    Comments:
    Proceedings of Light Cone 2016, held in Lisbon, September 2016. Minor changes in text. To appear in Few B Sys
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1611.03642 [pdf]
    Few Body Syst.(2017)·9 citations
  2. 10

    [Submitted on 11 Nov 2016] (cross-list from hep-ph)

    Chiral Thermodynamics in a finite box

    Ana Juričić🇦🇹 · Bernd-Jochen Schaefer🇩🇪

    Finite-volume modifications of the two-flavor chiral phase diagram are investigated within an effective quark-meson model in various mean-field approximations. The role of vacuum fluctuations and boundary conditions, their influence on higher cumulants and signatures of a possible pseudo-critical endpoint are amplified with smaller volumes.

    Comments:
    5 pages, 3 figures, Proceedings CPOD2016, Wroclaw, Poland
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1611.03653 [pdf]
    Acta Phys.Polon.Supp.(2017)·9 citations
  3. 11

    [Submitted on 11 Nov 2016] (cross-list from hep-ph)

    Holographic Heavy-Light Chiral Effective Action

    Yizhuang Liu🇺🇸 · Ismail Zahed🇺🇸

    We propose a variant of the - construction to describe the low energy effective theory of heavy-light mesons, interacting with the lowest lying pseudoscalar and vector mesons. The heavy degrees of freedom are identified with the - string low energy modes, and are approximated near the world volume of light branes, by fundamental vector field valued in . The effective action follows from the reduction of the bulk D-brane Born-Infeld (DBI) and Chern-Simons (CS) actions, and is shown to exhibit both chiral and heavy-quark symmetry. The action interpolates continuously between the case with massless mesons, and the case with heavy-light mesons. The heavy-light meson radial spectrum is Regge-like. The one-pion and two-pion couplings to the heavy-light multiplets are evaluated. The partial widths for the charged decays are shown to be comparable to the recently reported full widths for both the charm and bottom mesons.

    Comments:
    14 pages, 1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1611.03757 [pdf]
    PRD(2017)·31 citations
  4. 12

    [Submitted on 11 Nov 2016] (cross-list from hep-ph)

    Bound state structure and electromagnetic form factor beyond the ladder approximation

    V. Gigante🇧🇷 · J. H. Alvarenga Nogueira🇧🇷 · E. Ydrefors🇧🇷 · C. Gutierrez🇧🇷 · V.A. Karmanov🇷🇺 · T. Frederico🇧🇷

    We investigate the response of the bound state structure of a two-boson system, within a Yukawa model with a scalar boson exchange, to the inclusion of the cross-ladder contribution to the ladder kernel of the Bethe-Salpeter equation. The equation is solved by means of the Nakanishi integral representation and light-front projection. The valence light-front wave function and the elastic electromagnetic form factor beyond the impulse approximation, with the inclusion of the two-body current, generated by the cross-ladder kernel, are computed. The valence wave function and electromagnetic form factor, considering both ladder and ladder plus cross-ladder kernels, are studied in detail. Their asymptotic forms are found to be quite independent of the inclusion of the cross-ladder kernel, for a given binding energy. The asymptotic decrease of form factor agrees with the counting rules. This analysis can be generalized to fermionic systems, with a wide application in the study of the meson structure.

    Comments:
    19 pages, 6 figures, submitted to Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1611.03773 [pdf]
    PRD(2017)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE