Cosmic Muon-Removal Technique For NO$\nu$A Experiment

The NO$\nu$A experiment is a $\nu_{e}$ appearance neutrino oscillation experiment at Fermilab. It identifies the $\nu_{e}$ signal by the electromagnetic (EM) showers induced by the electrons in the final state of neutrino interactions. Cosmic muon induced EM showers, dominated by bremsstrahlung, are abundant in NO$\nu$A far detector. We use the Cosmic Muon-Removal technique to get pure shower sample from cosmic data. The large Cosmic-EM sample can be used to characterize the EM signature and provides valuable checks of the MC simulation, reconstruction, PID algorithm, and calibration across the NO$\nu$A detector.