2020/04/24 by Francesco Giacosa, Giacosa, Francesco
Physics and Astronomy · Chemistry · #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #Advanced NMR Techniques and Applications
paper · doi:10.48550/arxiv.2004.11567
The ground-state (lightest) hybrid nonet with exotic quantum numbers JPC=1-+ and the nonet of their chiral partners with JPC=1+- build a homochiral multiplet involving left- and right-handed currents, which under chiral transformation change just as (axial-)vector mesons. Masses and interactions of hybrids can be obtained in the context of the extended Linear Sigma Model. Here, we concentrate on the decays oh hybrids into two pseudoscalar mesons, such as ηπ and η′π modes. Indeed, π1(1400)→πη and π1(1600)→πη′ have been seen in experiments. Assuming that π1(1400) and π1(1600) correspond to the same state π1hyb, we show that these decays (and similar ones) follow from a chirally symmetric interaction term that breaks explicitly the axial anomaly. In this respect, these decays would be an additional manifestation of the axial (or chiral) anomaly in the mesonic sector.