Quarkonium Working Group
- Sasa Prelovsek, Chengping Shen "Recent results and discussions on the charmoniumlike states (ISR and Lattice)"
- Antonello Polosa et al. "Belle II and XYZ hadrons"
- Feng-Kun Guo "Hadronic molecules from X to Z"
1. ISR e+e- -> pi+pi-J/psi(psi'), K+K-J/psi(psi'), pi+pi-hc(1P, 2P), omega/phi chi_cJ, pi+pi-X(3823), gamma X(3872), DD(*)pi, ... to search/study Zc, Zc'. Zcs, ... all possible Y states, new resonances and understand the line shapes. 2. Y(3S) decays including Y(1D), etab(1S,2S)->gamma gamma, chi_b(1P,2P), ... 3. Tow-photon processes: gamma gamma -> phi J/psi to confirm/deny X(4350) and search for Y(4140), study of eta_c(2S), gamma gamma ->omega J/psi, DD*, etac pi0, ... to study X(3915), search for X(3872)-like states, ... 4. Data at the Y(6S) peak: - study anomalous transitions from Y(6S) to lower bottomonia (nature of Y(6S)); - search for missing bottomonia in 1D,2D,1F multiplets; - search for molecular states Xb, Wb via radiative and pi+pi- transitions. High energy scan: - decomposition of Rb into BB,BB*,B*B*,BB*pi,.. (nature of Y(5S), Y(6S)); - scan of cross-sections e+e- -> bottomonium + light hadrons (search for new vector states); - investigate Lambda_b-Lambda_b-bar threshold region. 5. B decays to: - charmonium (eta_c, J/psi, h_c, chi_cJ, eta_c(2S), psi(2S)), light hadrons and kaon (search for the only missing narrow charmonium state eta_c2(1D), for new charmonium-like states and for new channels of known states); - open charm-anti-charm final states (DD, DD*, DD*pi, DsDs,..) and kaon (search for elastic channels of known states, search for new charmonium(-like) states).