Reconstruction, June 9, 2009
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Contents
Reconstruction To Do List
- Generation
- Use genr8 for a2 production
- Skim off (hd_filter) the wanted events by cutting on the total neutral energy (> 6 GeV) but record the total number of events before skimming. The resulting MC data set will be stored for general use.
- Use Pythia for background generation after removing a2 → η π0 from the MC data stream as well as events with total neutral energy <= 6GeV.
- Use a2 charge exchange production xsection vs pythia total xsection to estimate number of signal and noise events 124μb @ 9GeV ?
- Analysis
- After pruning the Pythia events, check the generated vs. reconstructed energy in a plot.
- Look at the a2 mass peak - adjust cuts on the eta and pi0 masses then look at the effect on the different angular distributions (i.e. Gottfried-Jackson angles, etc.)
- look at difference between reconstructed and generated z position for less than 65 cm
- look at single photon reconstruction efficiencies
- adjust the error matrix for the BCAL (look in PID/DPhoton_factory.cc)
- Gather all relevant DocDB documents and cross section publications at one spot on the Wiki.
Documents to Review
Tentative Agenda
- Review Reconstruction Plans in list above
- a2_1320
- bggen and Pythia
- HOW-TO:
- bggen: by default uses the photon beam spectra over 0.15 to 12 GeV. Cross-section??. This has to be modified in fort.15 to 9GeV for us to compare cross sections. This also now dramatically increases our background data set by a factor of 10 over the default beam energy. Why is there a limit on 2.2 million events?
- filter_HighE: Filter out events with total neutral energy less than 6GeV.
- hdgeant: run the background thrown data set through hdGeant.
- fCalTree: reconstruction of possible pi0s and etas. η's and π0's are not separate objects
- HOW-TO:
- Discussion on Analysis
a2(1320) analysis
Above:reconstructed energy ratio as a function generated energy
Above:Photon multiplicity
Above: invariant mass distribution selecting events with only 4 reconstructed photons
pythia background
Above: photon energy fraction as a function of Thrown energy. Full of Fail.
Above: Pythia photon multiplicity after neutral energy filtering and reconstruction.
Above: invariant mass distribution selecting events with only 4 reconstructed photons from Pythia background.