Study of the threshold behavior of the $\eta$N scattering amplitude through the associated photoproduction of $\varphi$- and $\eta$-mesons

Madeleine Soyeur, Matthias F. M. Lutz

We suggest that the $\gamma p\to \varphi \eta p$ reaction cross section, in the kinematics where the $\eta p$ invariant mass in the final state lies between the threshold value (m${}_p$+m${}_{\eta }$) and the N…