1. reconstruction in final state Jaewon Park University of Rochester MINERvA/Jupiter Group Meeting, June 13, 2007

2. 2 Enhance pi0 energy resolution using chi-squire minimization wit h pi0 mass constraint I used startpos variable in recon ntuple block but I haven’t check how it wa s calculated. While reco dir is calculated from reco proton vertex and center of gamma e nergy, center of gamma energy is calculated with true hit position.  Reco direction is calculated using too much true information.

3. 3 Angle between two gammas RMS function will be determi ned from single pi0 particle e vent with each energy (theta= 0deg) Kevin suggested RMS functio n of angle Longitudinal vertex resolution is bigger than transverse res  0.67cm, 0.31cm respectively

4. 4 2-dimensional chi-square fit : including angle true dir true dir + fit reco dir + fit 12 34 (1) True angle, no chi-square (2) True angle, chi-square(E) fit (3) Reco angle, chi-square(E) fit (4) Reco angle, chi-square(E, angle ) (3) is expected bigger than (2) (4) is not much different from (3)