Examinando por Autor "Vega, Alfredo"

Mostrando 1 - 3 de 3
  • Miniatura
    Ítem
    Heavy quarkonia spectroscopy at zero and finite temperature in bottom-up AdS/QCD
    (American Physical Society, 2021) Martin Contreras, Miguel Angel; Vega, Alfredo; Diles, Saulo
    S-wave states of charmonium and bottomonium are described using bottom-up AdS/QCD. We propose a holographic model that unifies the description of masses and decay constants, leading to a precise match with experimental data on heavy quarkonia. Finite temperature effects are considered by calculating the current-current spectral functions of heavy vector mesons. The identification of quasiparticle states as Breit-Wigner resonances in the holographic spectral function was made. We develop a prescription to subtract background contributions from the spectral function to isolate the Breit-Wigner peak. The quasi-particle holographic thermal evolution is described, allowing us to estimate the melting temperature for vector charmonia and bottomonia. Our holographic model predicts that J/Ψ melts at 415 MeV(∼2.92Tc) and Υ melts at 465 MeV (∼3.27Tc).
  • Miniatura
    Ítem
    Properties of protons in nuclear medium with AdS/QCD model with a quadratic modified dilaton
    (Springer, 2021) Vega, Alfredo; Martín Contreras, Miguel Angel
    A modified version of the usual AdS/QCD soft wall model with quadratic dilaton is presented to study proton properties inside the atomic nucleus. We suggest a dilaton that catches the variation of the proton mass inside nuclei, called nuclear dilaton, and with this, we calculated electromagnetic form factors and magnetic moments for protons inside the atomic nucleus.
  • Miniatura
    Ítem
    Proton and neutron form factors from deformed gravity/gauge duality
    (Elsevier, 2021) Martín Contreras, Miguel Angel; Folco Capossoli, Eduardo; Li, Danning; Vega, Alfredo; Boschi-Filho, Henrique
    In this work we study the electric and magnetic Sachs form factors for proton and neutron by using a deformed gravity/gauge model. We describe holographically baryons as well as gauge bosons which are ruled by the parameters and , associated with confinement and kinematical energy scales, respectively. Then, we construct the interaction action and calculate the electric and magnetic form factors for the proton and the neutron, and their electromagnetic sizes. The obtained results are compatible with those found in the literature from experimental and theoretical data.