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We present the first measurement of the exclusive reaction $\gamma p\rightarrow a_2(1320)^0 \, p$ in the photon energy range $3.5$-$5.5$ GeV andfour-momentum transfer squared $0.2<-t<2.0$ GeV$^2$. Data were collected withthe CEBAF Large Acceptance Spectrometer at the Thomas Jefferson NationalAccelerator Facility. The neutral $a_2$ resonance was detected by measuring thereaction $\gamma p \rightarrow \pi^0 \eta p$ and reconstructing the $\pi^0\eta$ invariant mass. The differential cross section $d\sigma/dt$ was extractedat different beam energies in each $-t$ bin. The most prominent feature of thedifferential cross section is a dip at $-t\simeq 0.55$ GeV$^2$. This can bewell described in the framework of Regge phenomenology, where the exchangedegeneracy hypothesis predicts a zero in the reaction amplitude for this valueof the four-momentum transfer.

First measurement of direct photoproduction of the $a_2(1320)^0$ meson on the proton