Crystal ball evidence for new states

Abstract

Evidence for three new particles observed in the Crystal Ball detector is presented. The first particle, at 3592 MeV, is seen inclusively in γ transitions from ψ’, and is thus a candidate for η'c. The other two, at 1440 and 1640 MeV, are best seen in exclusive decays of ψ involving a prompt γ, and are thus candidates for bound states of two gluons. Detailed reasons are presented to support the contention that these states are distinct from previously observed candidates such as E(1420). Alternative hypotheses are discussed.