2025/11/04 by Wallner, S.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · doi:10.48550/arxiv.2511.02771
openalex publication_date 2025/11/04 · openalex created_date 2025/11/06 · openalex updated_date 2026/07/28
The Belle and Belle II experiments have collected a 1.6 ab-1 sample of e+e- collision data at center-of-mass energies near the Υ(nS) resonances. We conduct searches for transitions from the spin-singlet hb(1P,2P) states to the spin-triplet Υ(1S) and χbJ(1P) states. We do not find evidence for the hb(1P,2P)→ Υ(1S) π0 and hb(2P) → χbJ(1P)γ transitions. We find the first evidence for the hb(2P)→ Υ(1S)η transition. However, the measured branching fraction is lower than expected from related decays. Furthermore, we find evidence for Pc c s(4459)0 → J/ψΛ decays in inclusive Υ(1S,2S) decays. This is the first evidence for an exotic state produced in Υ(1S,2S) decays.