reconstruction in final state

1
reconstruction in final state

• Jaewon Park
• University of Rochester

MINERvA/Jupiter Group Meeting, June 13, 2007
2
Enhance pi0 energy resolution using chi-squire
minimization with pi0 mass constraint

• I used startpos variable in recon ntuple block
  but I havent check how it was calculated.
• While reco dir is calculated from reco proton
  vertex and center of gamma energy, center of
  gamma energy is calculated with true hit
  position.
• Reco direction is calculated using too much true
  information.

3
Angle between two gammas

• RMS function will be determined from single pi0
  particle event with each energy (theta0deg)
• Kevin suggested RMS function of angle
• Longitudinal vertex resolution is bigger than
  transverse res
• 0.67cm, 0.31cm respectively

4
2-dimensional chi-square fit including angle

• (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)

1
2
true dir
true dir fit

• (3) is expected bigger than (2)
• (4) is not much different from (3)

3
4
reco dir fit
reco dir fit