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description: GSI Helmholtzzentrum für Schwerionenforschung
items: EMC cluster energy correction
items: Re: EMC cluster energy correction

EMC cluster energy correction
type: item
description: Dear colleagues, I have committed an updated on emc cluster energy correction. To start from the beginning, emc cluster energy correction should correct for the energy leakage in dead material and via rear side of crystals. The energy leakage is dependent on energy and polar angle. Up to now energy correction with parametrization was available via PndEmcCluster::GetEnergyCorrected() and it was based on the study performed in Babar framework. Later Ola Biegun implemented energy-angle correction from 2-dimensional histogram, but that correction was not integrated in full pandaroot reconstruction chain. After that I tried to merge two approaches via one class PndEmcClusterHistCalibrator(Int_t method, Int_t version) where first input parameter: method=1 - correction from the interpolation on 2-dimensional histogram method=2 - correction from parametrization. Second parameter "version" should take into account different versions of correction based for example on different geometries, including dead material or Geant3 vs Geant4. At the the moment only one version is provided based on Geant3 simulation. Till now it didn't provide reliable results. But I made several correction in the code and calculated corrections on above 1 million events statistics. Data to calculate correction are produced with /macro/emc/dedicated/EnergyPosCorrection/emc_correction_data_production. C. Then to calculate correction from histogram in emc_correction_hist.C energy and theta range is divided into intervals, and for each interval a histogram with MonteCarlo energy divided by Reconstructed energy is filled Mean value of histogram for given interval is calculated. Finally there are four histograms for barrel emc, forward, backward endcaps and shashlyk. To obtain correction with parametrization in emc_correction_parametrization.C at the beginning similar histograms are calculated but in addition for barrel low and high energies are separated. Histograms are fitted and parameters are stored in …
creator: Dima Melnychuk
date: 2012-02-15T12:53:29-00:00

Re: EMC cluster energy correction
type: item
description: This looks very good, especially the pi0 mass plots are very convincing.
creator: Ronald Kunne
date: 2012-02-15T14:44:08-00:00