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Pion–nucleus elastic scatterings incorporating medium effects within the Eikonal–Glauber model

  • Hyeon-dong Han,
  • Parada T. P. Hutauruk,
  • Seung-il Nam

摘要

In this present investigation, we explore the elastic scattering of pions with nuclei (πA), primarily influenced by the \(\Delta\) Δ (1232) resonance, within the Eikonal–Glauber model. The medium effects are incorporated by considering nuclear-density ( \(\rho _A\) ρ A ) dependent masses of baryons and strong coupling constants. These dependencies are computed and parameterized up to \(\mathcal {O}(\rho _A^2)\) O ( ρ A 2 ) based on the quark–meson coupling (QMC) model. The Wood–Saxon type density profile is utilized for the bound nucleons within finite nuclei. The element \(\pi ^+\) π + -N scattering cross-section for the Glauber approach is determined using the conventional effective Lagrangian method. Subsequently, we analyze the total cross-sections for elastic scattering with \(^4\) 4 He and \(^{12}\) 12 C targets. Our numerical results demonstrate a favorable agreement with JINR data for the \(^4\) 4 He target, accurately reproducing the total cross-section. However, when considering the \(^{12}\) 12 C target, deviations of approximately \(\lesssim 10\%\) 10 % . We also consider the multiple-scattering effects inside the nucleus approximately, using the single-channel meson-baryon Bethe–Salpeter equation, resulting in the effective width-broadening of the \(\Delta\) Δ resonance to reproduce the data better.