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Isolation cut, rejection and efficiency versus cut value

Updated on Tue, 2008-08-19 15:13. Originally created by jwebb on 2008-08-19 15:13.
Abstract:  We show what isolation cut is needed to obtain a given pi0 rejection power in each pT bin.
 

1.0 MC Event Sample

  1. Pythia event sample (pibero's gamma trees) w/ proper weighting for partonic pT bins
  2. No offline trigger simulation
  3. full EEMC acceptance

2.0 Definition of Isolation Cut

We use an isolation cut, which consists of correcting the ET of the tower which contains the photon candidate based on the position of the candidate within the tower, and dividing that corrected ET by the sum of all towers w/in R < 0.3.  The following links summarize the method.
  1. See You do not have access to view this node for definition of the 1-tower isolation cut and evaluation of rejection versus efficiency based on pythia events.
  2. See You do not have access to view this node for data vs MC comparison, including trigger simulation.
The links above show plots of rejection power vs. efficiency.  It is informative to plot rejection vs. applied cut, and efficiency vs. applied cut.  See figure 1 below.
 
Figure 1 -- Rejection power (red) or photon efficiency (black) vs. isolation cut.
 
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geometry used in Simulation (plain) vs. Embedding

Updated on Mon, 2008-08-18 15:28. Originally created by bouchet on 2008-08-18 12:55.

Geometry used in simulation/embedding for hits projection

For embedding with SSD, we project GEANT hits on real geometry.

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Final Data Plots

Updated on Mon, 2008-08-18 10:08. Originally created by gdwebb on 2008-08-18 10:08.

 The following plots are for data.

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Mid-rapidity Collins Asymmetry Calculation

Updated on Tue, 2008-09-02 08:19. Originally created by rfatemi on 2008-08-17 20:59.

In order to estimate the order magnitude of the single spin Collins asymmetry at midrapidity I calcuated the following partonic components from jet reconstruction using the STAR PYTHIA + GEANT simu

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Vertex splitting QA in the new Year 7 Au+Au production(P08ic w/Minuit3)

Updated on Wed, 2008-08-27 17:17. Originally created by melnimr on 2008-08-15 15:23.

I have looked at the new P08ic AuAu production that was done with Minuit3 VF to test Anthony's modified VF.

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Comparison of Different Calculations for z

Updated on Fri, 2008-08-15 10:34. Originally created by kocolosk on 2008-08-15 09:03.

WORK IN PROGRESS

 plus-z-log

 plus-z

minus-fit-2 minus-fit-3 minus-fit-4

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Data/MC comparison for 2006 Dijet Cross-section

Updated on Fri, 2008-08-15 14:10. Originally created by mattheww on 2008-08-14 15:05.

I started with the 2006 Simulation Jet Trees. Using the ConeJets12 and PythiaJet branches, I associated the detector jets to the nearest pythia jet by distance in eta-phi space.

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Spin asymmetry statistical errors

Updated on Wed, 2008-08-20 18:24. Originally created by kurnadi on 2008-08-11 22:06.

This study on statistical errors was prompted by the horrible linear fit to the fill-by-fill inclusive electron asymmetry, as shown at the June 2008 Collaboration Meeting at UC Davis.

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Cuts: Primary Vertex Z, Track Eta

Updated on Mon, 2008-08-11 21:08. Originally created by kurnadi on 2008-08-11 21:06.

Two of the cuts that significantly reduced the number of electrons available for this analysis is the event primary vertex-z and track-η cuts.

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ssd geometry tables : change

Updated on Fri, 2008-08-15 08:59. Originally created by bouchet on 2008-08-08 12:39.

 In continuation of bug #1255 (see previous blog entry) for ssd geometry tables used in simulation/real data, it has been decided to not use the 

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