Abstract
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 language | English (US) |
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Pages (from-to) | 306-308 |
Number of pages | 3 |
Journal | Physics Letters B |
Volume | 80 |
Issue number | 3 |
DOIs | |
State | Published - Jan 1 1979 |