Probing exotic JPC resonances from deeply bound charmoniumlike molecules: Insights for identifying exotic hadrons

Abstract

We investigate the resonance phenomenon in deeply bound charmoniumlike states. By interpreting the Y(4220), Y(4360), and ψ(4415) states as deeply S-wave bound DD¯1, D*D¯1, and D*D¯2* molecules, respectively, we robustly predict the existence of 4 S-wave deeply bound C-parity partner states and 13 P-wave charmoniumlike molecular resonances. These states, formed by exchanging the light mesons and pinpointed through the complex scaling method, include 3 S-wave bound states with exotic quantum numbers I(JPC)=0(1−+) and 5 P-wave resonances with exotic 0(0−+) and 0(2+−). We expect future experiments to search for such exotic molecular resonances, which will not only enrich the ongoing construction of “Particle Zoo 2.0” but also help to scrutinize the hadronic molecular assignments of the Y- family particles including the Y(4220), Y(4360), and ψ(4415) states. Published by the American Physical Society 2024