1 / 4

reconstruction in final state

Investigating methods to improve pi0 energy resolution by minimizing chi-square with mass constraint in final state reconstruction. Analysis includes usage of start position variable, true hit position calculations, and comparison of directional information from true and reconstructed data.

bowley
Download Presentation

reconstruction in final state

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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 haven’t 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 (theta=0deg) • 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 • (3) is expected bigger than (2) • (4) is not much different from (3) true dir true dir + fit 3 4 reco dir + fit reco dir + fit

More Related