In search of the ηc

G. Eilam, B. Margolis, S. Rudaz

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We argue that the X(2.88) detected in π-p → γγ + n at 40 GeV/c cannot be the ηc. We discuss the possibility that a qq̄cc̄ state is produced there, probably the same state discovered in radiative decay of the J/ψ. Only at much higher energies is the ηc expected to dominate over qq̄cc̄ in the π-p interaction. We also discuss coherent photoproduction and find that four quark state production would dominate over ηc.

Original languageEnglish (US)
Pages (from-to)306-308
Number of pages3
JournalPhysics Letters B
Issue number3
StatePublished - Jan 1 1979


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