I discuss the nature of the new charm and charmonium like states observed in the last few years and measure- ments that can test these assignments. In particular it appears that the X(3943) is the ηc1 (31S0) which can be tested by looking for it in γγ→DD̄*, the Y (3943) is the χc1(23P1) which can be tested by looking for it in DD̄* and DD̄*, the Z(3930) is the χc2(23P2) which can be confirmed by looking for it in DD̄*. If the X(3872) is confirmed to have JPC = 1++ it is almost certainly a multiquark state while if its JPC is found to be 2-+ is is likely the 1 1D2 state. The Y (4260) appears to be an extra 1- which is most easily explained as a charmonium hybrid. This can be tested by looking the DD1 final state.

Additional Metadata
Conference 4th International Conference on Flavor Physics and CP Violation, FPCP 2006
Citation
Godfrey, S. (2006). The XYZ's of cc̄: Hints of exotic new mesons. Presented at the 4th International Conference on Flavor Physics and CP Violation, FPCP 2006.