system is a good place for the lowest mass 0++ glueball.
Three enhancements corresponding to f2 (1270), a2 (1320),
f2 (1525) and f0 (1710) have been observed. The
large charm production cross section at HERA provides a means to
study excited charm and charm-strange mesons produced in ep
collisions. The results of such study are reported in this report.
Significant signals were identified for D1(2420)0,
D2*(2460)0 and Ds1(2536)+.
Key words: excited charm meson, heavy-quark spectroscopy, glueball,
system 
