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arXiv · 1612.09218

Excited Scalar and Pseudoscalar Mesons in the Extended Linear Sigma Model

Denis Parganlija·Francesco Giacosa
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Abstract

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 $η(1295)$, $π(1300)$, $η(1440)$ and $K(1460)$ as excited $\bar{q}q$ states.

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Denis Parganlija, Francesco Giacosa. 2017-06-28. Excited Scalar and Pseudoscalar Mesons in the Extended Linear Sigma Model. https://doi.org/10.1140/epjc%2Fs10052-017-4962-y

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