1. Update on final state study Jaewon Park University of Rochester MINERvA/Jupiter Group Meeting, June 27, 2007

2. 2 Pi0 CAL New code (batch mode) doesn’t have high side tail in (recoE-trueE)/trueE plot.  Further event selection can be applied. Old analysis didn’t use n_hadron=2 condition. It’ll try to process “p pi0 pi-” even t. Old plot

3. 3 Number of reconstructed tracks If no proton track is foun d, it’s not easy to reconst ruct primary vertex. It’ll be useful to compar e gamma direction from track and gamma directi on from energy vector. Number of proton tracksNumber of gamma tracks Proton nTrk vs. KineticEGamma1 nTrk Gamma2 nTrk

4. 4 Reconstructed primary vertex Reconstructed primary vertex is calculated from proton track ’s start position. Assuming proton makes ioniza tion immediately, some of eve nts are out of expected error. If x or y coordinate is off, z co ordinate is also off. recoX-trueXrecoY-trueY recoZ-trueZ(recoX-trueX) vs. (recoZ-trueZ) Good event Strange event

5. 5 What’s going on? PAW > nt/scan 1 event=471 ! ! ! ntruth nptrue ntmoth vztrue +-------+--------+---------+--------+----------+ | Event | ntruth | nptrue | ntmoth | vztrue | +-------+--------+---------+--------+----------+ | 471 | 8 | | | | | * 1 | | 14 | 0 | -75.6783 | | * 2 | | 2212 | 0 | -75.6783 | | * 3 | | 111 | 0 | -75.6783 | | * 4 | | 22 | 3 | -75.6783 | | * 5 | | 22 | 3 | -75.6783 | | * 6 | | 2212 | 2 | -12.0367 | | * 7 | | 2212 | 2 | -12.0367 | | * 8 | | 2212 | 6 | 31.9961 | +-------+--------+---------+--------+----------+ Wrong startpos(nRecon) ntuple variable is found. PAW > nt/scan 1 event=471 ! ! ! nrecon iTrk ipTrk startpos(3,1) +-------+--------+------+-------+---------------+ | Event | nrecon | itrk | iptrk | startpos(3,i) | +-------+--------+------+-------+---------------+ | 471 | 4 | | | | | * 1 | | 2 | 2212 | -13.5231 | | * 2 | | 5 | 22 | 32.15 | | * 3 | | 6 | 2212 | -13.5231 | | * 4 | | 8 | 2212 | 32.15 | +-------+--------+------+-------+---------------+ Green star( ★ ) in aegis eve nt display means reconstru cted primary vertex Red circle( ☻ ) is true prima ry vertex Same value