Selection of coincidence electron-proton events in nuclei interaction

The main goal of this analysis is to study momentum (or kinetic energy) distribution of the backward going protons using data from CLAS/eg2 experiment at Jefferson Lab. In this experiment scattering of a $5.014\ GeV$ electron beam off various nucleus targets, ranging from deuterium to lead, have been recorded. The analysis includes selection of events in the reaction $A(e, e^\prime, P_{back})X$, where $ P_{back}$ is a proton scattered above $90^\circ$ either in the lab coordinate frame or with respect to the direction of the interacting virtual photon, then perform required corrections and study the protons momentum distribution as a function of energy transfer. In this paper identification of electron-proton events is presented.