https://doi.org/10.1140/epjc/s10052-017-4962-y
Regular Article - Theoretical Physics
Excited scalar and pseudoscalar mesons in the extended linear sigma model
1
Institut für Theoretische Physik, Technische Universität Wien, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria
2
Institute of Physics, Jan Kochanowski University, ul. Swietokrzyska 15, 25-406, Kielce, Poland
3
Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, 60438, Frankfurt am Main, Germany
* e-mail: denisp@hep.itp.tuwien.ac.at
Received:
12
January
2017
Accepted:
31
May
2017
Published online:
6
July
2017
We present an in-depth study of masses and decays of excited scalar and pseudoscalar 
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 
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 
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 / and pseudoscalar mesons 
, 
, 
and K(1460) as excited states.
© The Author(s), 2017
