Excited scalar and pseudoscalar mesons in the extended linear sigma model
Abstract We present an in-depth study of masses and decays of excited scalar and pseudoscalar $${\bar{q}}q$$ 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 consequen...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2017-07-01
|
| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-017-4962-y |
| Summary: | Abstract We present an in-depth study of masses and decays of excited scalar and pseudoscalar $${\bar{q}}q$$ 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 $$f_0(1790)$$ 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 $$a_0(1950)$$ 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 $$f_0(1790)$$ f 0 ( 1790 ) / $$a_0(1950)$$ a 0 ( 1950 ) and pseudoscalar mesons $$\eta (1295)$$ η ( 1295 ) , $$\pi (1300)$$ π ( 1300 ) , $$\eta (1440)$$ η ( 1440 ) and K(1460) as excited $${\bar{q}}q$$ q ¯ q states. |
|---|---|
| ISSN: | 1434-6044 1434-6052 |