单词	charmonium
释义	charmonium /tʃɑːˈməʊnɪəm / noun (plural charmonia) Physics A combination of a charmed quark and antiquark.The measurement of the production rate of the J / and other charmonium mesons was a key indicator of possible new phenomena in the pioneering CERN experiments.... The hadron is represented by an external color field and the charmonium is represented by a small color dipole. Using the ingredients from those calculations we calculate also exclusive electroproduction of charmonia off nuclei. Origin 1970s: from charm (sense 4 of the noun).
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