Photoproduction of hidden charm pentaquark states P c + ( 4380 ) and P c + ( 4450 )

We propose to study the pentaquark candidates of P+c(4380) and P+c(4450) in J/ψ photoproduction and look for further experimental evidence for their nature. Since the photoproduction process does not satisfy the so-called “anomalous triangle singularity” condition their presence in J/ψ photoproduction would conclude that they should be genuine states and provide further evidence for their existence