Year: 2017
Type: article
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 $$\eta (1295)$$ , $$\pi (1300)$$ , $$\eta (1440)$$ and K(1460) as excited $${\bar{q}}q$$ states.
Source: The European Physical Journal C
Authors: Denis Parganlija, Francesco Giacosa
Institutions: TU Wien, Goethe University Frankfurt, Jan Kochanowski University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2563491950