Speaker
runqiu ma
(Insititute of High Energy Physics, CAS)
Description
Based on a sample of 10 billion J⁄ψ events collected with the BESIII detector, a partial wave analysis of the decay J⁄ψ □(→) γηη' is performed. An isoscalar state with exotic J^PC=1^(-+) quantum numbers, denoted as η_1 (1855), has been observed for the first time with statistical significance larger than 19σ. Its mass is consistent with the predicted mass of 1^(-+) hybrid from Lattice QCD. This is an observation of a new category of hadronic matter, which opens a new direction to complete the picture of spin-exotics.
Primary authors
Beijiang Liu
(Institute of High Energy Physics)
runqiu ma
(Insititute of High Energy Physics, CAS)
Peer reviewing
Paper
Paper files:
