1. final state study Jaewon Park University of Rochester MINERvA/Jupiter Group Meeting, Oct 10, 2007

2. 2 Gamma and Electron track discrimination Only one of gammas makes a track in this event. It looks pretty similar to nu_ e CC interaction Distance between primary v ertex and start position of ga mma track can help to distin guish those events. gap Last 3 rd of track First 2/3’s of track

3. 3 Gamma track’s distance to primary vertex Using true primary vertex We can use minimum distance cut to distinguish gamma from other types of event. If the distance is too long, that’s also difficult to reconstruct th e event.