# Excited scalar and pseudoscalar mesons in the extended linear sigma model

The European Physical Journal C, Jul 2017

We present an in-depth study of masses and decays of excited scalar and pseudoscalar ${\bar{q}}q$ states in the Extended Linear Sigma Model (eLSM). The model also contains ground-state scalar, pseudoscalar, vector and axial-vector mesons. The main objective is to study the consequences of the hypothesis that the $f_0(1790)$ resonance, observed a decade ago by the BES Collaboration and recently by LHCb, represents an excited scalar quarkonium. In addition we also analyse the possibility that the new $a_0(1950)$ resonance, observed recently by BABAR, may also be an excited scalar state. Both hypotheses receive justification in our approach although there appears to be some tension between the simultaneous interpretation of $f_0(1790)$/$a_0(1950)$ and pseudoscalar mesons $\eta (1295)$, $\pi (1300)$, $\eta (1440)$ and K(1460) as excited ${\bar{q}}q$ states.

This is a preview of a remote PDF: https://link.springer.com/content/pdf/10.1140%2Fepjc%2Fs10052-017-4962-y.pdf

Denis Parganlija, Francesco Giacosa. Excited scalar and pseudoscalar mesons in the extended linear sigma model, The European Physical Journal C, 2017, 450, DOI: 10.1140/epjc/s10052-017-4962-y