2023/10/13 by P. Haas, Haas, Philipp
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Particle physics theoretical and experimental studies #High-Energy Particle Collisions Research
paper · pdf · doi:10.48550/arxiv.2310.09148
Lattice-QCD predicts the exotic meson π1(1600) to dominantly decay to b1π. The b1π decay channel is accessible via the ωπ-π0 final state. COMPASS recorded the so far largest data set of this final state. A partial-wave analysis allows to determine the resonant content in this final state including possible contributions from π1(1600). Decomposing the measured intensity into amplitudes of partial waves gives a first qualitative insight into contributing intermediate states. We observe signals in agreement with well-established states like the π(1800) and a4(1970). Smaller resonance-like signals are visible in the JPC sectors 3++ and 6++, where possible states were claimed but none are established. For JPC=1-+ a signal at 1.65 GeV/c2 in b1(1235)π partial waves is consistent with the expected π1(1600).