The scalar-isovector sector in the extended Linear Sigma Model

Understand

We study basic properties of scalar hadronic resonances within the so-called extended Linear Sigma Model (eLSM), which is an effective model of QCD based on chiral symmetry and dilatation invariance.

• In particular, we focus on the mass and decay width of the scalar isovector state $a_{0}(1450)$ and perform a numerical study of the propagator pole(s) on the unphysical Riemann sheets.
• In this work, this meson is understood as a seed state explicitly included in the eLSM.
• Our results show that the inclusion of hadronic loops does not modify much the previously obtained tree-level results.