Yes we can! We just need more and better! Passed three decades since the ψ(4S) has been found, unfortunately statistics is still rather poor! Nevertheless, evidence is mounting for ψ(3D), ψ(5S), ψ(4D), ψ(6S), and ψ(5D). Furthermore, upcoming evidence for ψ(7S), ψ(6D), and ψ(8S). |