Investigating MPI, two-particle angular correlation in e − p photoproduction and assessing resolution and efficiency of the ePIC detector for EIC

Abstract

The majority of e − p interactions occur via the exchange of photons between them. This interaction manifests in two distinct regimes determined by the virtuality of the exchanged photon: deep inelastic scattering for high virtuality photons and photoproduction for low virtuality (or quasireal) photons. This thesis investigates multiple-partonic interactions (MPI) and two-particle correlations in e−p photoproduction across a range of center-of-mass energies from 30 to 318 GeV. Monte Carlo simulations based on the PYTHIA8 event generator are utilized to examine the presence of MPI in e − p photoproduction by comparing PYTHIA8 predictions under various MPI scenarios with experimental data obtained from the ZEUS experiment. In the analysis of two-particle !⌘ − !" correlations, the ridge structure in !⌘ −!" space is studied. In the away-side region of !" a ridge structure is present in the data and is replicated well by PYTHIA8, although there is no sign of a near-side ridge. Additionally, the variation of correlations with center of mass energy (ps) is studied. Furthermore, the resolution and efficiency of the ePIC detector for the Electron-Ion Collider (EIC) are assessed using charged hadrons.