2017/09/07 by Denis Parganlija, Parganlija, Denis, Francesco Giacosa +1
Physics and Astronomy · #Particle physics theoretical and experimental studies #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.1709.02181
7 pages, 1 table. Presented at "Excited QCD 2017", Sintra, Portugal, May 7-13, 2017
arxiv created 2017/09/07 · arxiv updated 2017/09/08
A decade ago, BES Collaboration reported the discovery of a new scalar isosinglet resonance denoted as f0(1790). The finding was subsequently confirmed by LHCb. Recently, the existence of the corresponding isotriplet state -- the a0(1950) resonance -- has been claimed by BABAR. We investigate whether these resonances can be described as excited qq states. To this end, a comprehensive Lagrangian containing ground-state qq mesons as well as their first excitations is constructed in accordance with symmetries of the strong interaction. Both f0(1790) and a0(1950) emerge as compatible with qq excitations; however, tension appears to arise between the simultaneous interpretation of f0(1790)/a0(1950) and pseudoscalar mesons η(1295), π(1300), η(1440) and K(1460) as excited qq states.