Enhancing Photon-Gluon Fusion Process in $e$ + $p$ and $e$ + A Two-Particle Correlations. *

Two-Particle correlations have been a very useful probe to study the gluon dynamics in hadronic collisions. It is expected to be an important probe of the saturation for low-energy gluons. Therefore, as the new Electron-Ion Collider (EIC) will be built at Brookhaven Laboratory, studies of di-hadron correlations in electron-proton and electron-ion collisions are essential. In deep inelastic scattering at high $Q^{2}$, the gluon wavefunction can be probed by measuring the Photon-Gluon Fusion process. By separating out the Photon-Gluon Fusion of $e$ + $p$ and $e$ + A events, a cleaner signature of gluon saturation and gluon distribution function is possible. In this poster, we show the results of a DJANGOH study to separate the Photon-Gluon Fusion from other processes that contribute to Two-Particle Correlations.