Evaluating the possibility of detecting electron neutrino and measuring its cross-section using the FASER detector.

Measuring the flux of neutrino from the proton-proton collision at the Large Hadron Collider connects to further understanding of the QCD interaction at p-p collision. FASER experiment aims to measure the neutrino flux and already detected the neutrinos from p-p collision. In this report, we study a new way to detect electron neutrino using the FASER detector. Our new way aims to detect electron neutrino interactions in the electromagnetic calorimeter of the FASER detector. Using the Monte Carlo simulation, we evaluate the possibility of detecting electron neutrino by our method and the possibility of measuring its cross-section. The statistical analysis indicated that, while the current significance for detecting νe is not reached to 3σ, we will able to detect νe using this method by the end of Run-4. The significance becomes 5σ at about 450 fb^{−1} without the muon detector, at about 250 fb^{−1} with the muon detector behind the calorimeter with sufficient materials. The uncertainty of cross-section becomes under 70 % at 500 fb^{−1}. Additionally, the inclusion of the muon detector behind the calorimeter could reduce the uncertainty of measuring about 10 %.