@article{oai:tsukuba.repo.nii.ac.jp:00007516, author = {Iwasaki, Yoichi and 岩崎, 洋一}, issue = {3}, journal = {Physical review D}, month = {Feb}, note = {It is argued that when a pair of a charmed quark and a charmed antiquark is produced via one photon, the mass of the charmed quark is to be light, i.e., roughly 500 MeV, quite contrary to the heavy mass usually assumed. It is thus proposed that we have to discriminate between, at least, two kinds of the mass of the charmed quark that are exhibited in different situations.}, pages = {765--767}, title = {Two kinds of the mass of the charmed quark}, volume = {17}, year = {1978} }