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Dear all, Since Hypernews forum is delay due to the email problem, I post the message from Changzheng following what he have sent by email yesterday, Sorry for inconvenience
For the charmonium topic, I think the search for D-wave spin-singlet eta_c2 can be a mode to show the photon detection ability.
One decay chain for this search is e+e- --> pi+pi-h_c(2P) [not observed yet] h_c(2P)--> gamma eta_c2 eta_c2-->gamma h_c h_c-->gamma eta_c eta_c-->KsK+pi-+c.c., K_s --> pi+pi-
As the h_c(2P) mass is unknown, we may take the calculation by Ted Barnes (PRD 72, 054026 (2005)), M=3934 MeV, width ~ 90 MeV [another option is the mass is less than DD* threshold, and the width will be very narrow, seems to me less probable] the mass of the eta_c2 should be close to that of psi_2 state, namely the X(3823). We may assume M=3823 MeV, width ~ 1 MeV
I only listed one mode for eta_c decays, in princile we can add more.
We donot know where is the best energy point to take data, I think we can start at the peak of psi(4415).
A simpler mode for the eta_c2 search is
psi(4415)-->gamma eta_c2 eta_c2-->gamma h_c h_c-->gamma eta_c eta_c-->KsK+pi-+c.c., K_s --> pi+pi-
[This decay chain may start from other charmonium or charmoniumlike states, such as psi(4160), Y(4260), Y(4360), and so on.]
Maybe this is a bit easier to simulate and analyze. We may expect some results for the March workshop.