At IP2I Lyon (and LPTHE for Giacomo Cacciapaglia), we are interested in working on the fullsim study of the e+e- --->Z-->a + gamma—->3gamma ALP signature, with the IDEA dual readout crystal calorimeter. At the time of the FS and the ECFA report, we had started to work with Giacomo P. on estimations of the reducible background for the fastsim version, and would still want to advance a bit more on this as well. Perhaps there could be some synergy with the DESY group if they are working on the non-Z peak version of the study.
Also with Aldo Deandrea of our IP2I theory group and our student Christian Verollet