2020/04/21 by Piotrowska, Milena
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2004.09970
The main aim of our study is to understand the nature of some conventional and non-conventional mesonic states by applying effective QFT models. We start from the relativistic Lagrangians containing a unique qq seed state which is strongly coupled to the low-masses decay products of the original state. We find out that some states may appear as a dynamically generated companion poles of the heavier qq mesons. In particular we show that K^*0(700) is a companion pole of the well-known K^*0(1430) resonance, X(3872) emerges as a (virtual) companion pole of χc1(2P), and the puzzling Y(4008) is not a real state, but a spurious enhancement which appears when studying the state ψ(4040).