1. Gamma track study update Jaewon Park University of Rochester MINERvA/Jupiter Group Meeting, Sep 5, 2007

2. 2 Tracker Filter Definition  View: X, U, or V  HitPlane: Plane that has hits Minimum number of HitPlanes  View that has largest number of hitPlanes > 3 hitPlanes  Sum of hitPlanes from the other two views > 3 hitPlanes Minimum number of hit in a view  Number of hits per view > 3

3. 3 Digit hit xview uview vview Low energy, large angle gamma2 has a few hits but it doesn’t look like that poo r track. Tracker didn’t fit gamma2 because it di dn’t meet the requirement Apply different loose requirement for s hort track?

4. 4 Number of hitPlane for gamma Two gamma e vent sample By looking ra w digit hits, si mply check hi tplane distribu tion. This is before applying Kal man Filter

5. 5 Gamma track efficiency as function of angle