ET Correction Factor Study using Gaussian Fits

In this study of the correction factor, I use the same set up as in the previous two studies, throwing electrons, photons and pions at 1, 2, 5, 10, 15, 20, 30, 40, and 50GeV in Pt using the full 2006 geometry and the calorimeter only geometry. In addition to looking at the ET deposited in a 3X3 patch, I also look at the ET deposited in the full endcap. The method I use to calculate the correction factor has also changed slightly. Instead of dividing the thrown Pt by the mean of the detected ET spectrum, I fit a gaussian to the detected ET spectrum and divide the thrown Pt by the mean of the fit to get the correction factor.

The plots of the detected ET spectra fitted with gaussians using the full geometry can be found below. The spectra detected by a 3X3 patch and the spectra detected using the full end-cap are shown:

• Electrons:  3X3 Patch     Full End-Cap
• Photons:    3X3 Patch     Full End-Cap
• Pions:        3X3 Patch     Full End-Cap

Fig 1: This plot shows the correction factors for the full geometry using the ET detected in the 3X3 patch.

Fig 2: This plot shows the correction factors for the full geometry using the ET detected in the full endcap.

The plots of the detected ET spectra fitted with gaussians using the calorimeter only geometry can be found below. The spectra detected by a 3X3 patch and the spectra detected using the full end-cap are shown:

• Electrons:  3X3 Patch     Full End-Cap
• Photons:    3X3 Patch     Full End-Cap
• Pions:        3X3 Patch     Full End-Cap

Fig 3: This plot shows the correction factors for the calorimeter only geometry using the ET detected in the 3X3 patch.

Fig 4: This plot shows the correction factors for the calorimeter only geometry using the ET detected in the full endcap.

In addition to calculating the correction factor by taking the mean of the gaussian fit of the detected ET spectrum, I have also calculated the correction factor on an event by event basis by dividing the thrown Pt by the detected ET. I then plotted the correction factor for each event vs. eta and phi. The below plots used the ET detected by the full end-cap with the condition that the high tower not be in etabins 1 or 12. Similar plots using the 3X3 patch and without the etabin condition can be found in the pdf files at the end of the page.

Full Geometry:

• Electrons:  Vs Eta     Vs Phi
• Photons:    Vs Eta     Vs Phi
• Pions:              Vs Eta     Vs Phi

Calorimeter Only Geometry

• Electrons:  Vs Eta     Vs Phi
• Photons:    Vs Eta     Vs Phi
• Pions:        Vs Eta     Vs Phi

In addition to the above plots, I have generated plots showing the properties of the thrown particles as well as plots of the event by event correction factors vs eta and phi using different selection criteria. These plots can be found in the following PDF files.

Full Geometry: Electrons  Photons  Pions

Calorimeter Only Geometry: Electrons  Photons  Pions