Abstract
Using the energy dependence of photoproduction data from Cornell, Fermilab, and SLAC, we calculate the phase of the forward elastic $\frac{J}{\ensuremath{\psi}}(3100)\ensuremath{-}N$ scattering amplitude by applying modulus dispersion relations. The total cross section thus obtained suggests that the $\frac{J}{\ensuremath{\psi}}(3100)$ is a hadron. A possible threshold due to production of a new quantum number is also discussed. Similar analysis is carried out for the $\ensuremath{\varphi}p$ forward elastic amplitude.
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