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Cuts Summary
Updated on Thu, 2008-09-04 14:45. Originally created by kocolosk on 2008-08-22 03:35.This page summarizes the effect of each major cut in the 2006 jet+charged pion analysis. Each plot is obtained by applying all other applicable analysis cuts except the one being illustrated.
Figure 1: Black is TPC z-vertex for all BJP1-triggered events, Green is the TPC z-vertex distribution for events in BBC timebins 6-9, and Red is the TPC z-vertex distributions for all charged pion tracks (inclusive, no trigger jet requirement).
It appears at first that the vz distribution of good tracks is broader than the BBC 6-9 distribution, but that’s not actually the case. Here’s the ratio of the red and green histograms from the above plot:
Figure 1b
The following histograms use positively charged pions from any spin state. Black lines are inclusive π+ passing all cuts except the one being shown, green lines are leading π+ opposite a trigger jet, and the filled green histogram shows the π+ accepted for the asymmetry analysis.
Figure 2: |η| < 1.0
Figure 3: |dcaG| < 1.0
Figure 4: nHitsFit > 25
Figure 5: nσ(π). It’s not possible to read off the efficiency from this histo because I actually use a time-dependent cut window based on the results of fill-by-fill fits to the nσ(π) distributions. Ideal world cut shown is nσ(π) [-1,2]
Here’s the ratio of the green and black histograms from that plot. The away-side spectrum has a relative lack of electrons but an increase in the p/K contamination:
Figure 5b
I should also add some more plots here documenting the cuts on jet pT, detector η, and N.E.F.
SSA vs. z
Updated on Fri, 2008-08-22 02:44. Originally created by kocolosk on 2008-08-22 02:41.Asymmetries are defined as (Y,B):
SSA vs. Fill
Updated on Fri, 2008-08-22 02:40. Originally created by kocolosk on 2008-08-22 02:37.Asymmetries are defined as (Y,B):
List of Jobs for run 9 as of 8/21/08
Updated on Thu, 2008-08-21 11:28. Originally created by sowinski on 2008-08-21 11:28.Attached is a list of jobs for run 9 with names of those volunteering to handle tasks.
Spin asymmetry statistical errors, part 2
Updated on Wed, 2008-08-20 18:32. Originally created by kurnadi on 2008-08-20 18:14.Updated the dE/dx cut. Previous asymmetry calculations was using +/- 3σ in dE/dx. The following has a tighter cut on the lower end, varies with momentum bins.
Isolation cut, rejection and efficiency versus cut value
Updated on Tue, 2008-08-19 15:13. Originally created by jwebb on 2008-08-19 15:13.1.0 MC Event Sample
- Pythia event sample (pibero's gamma trees) w/ proper weighting for partonic pT bins
- No offline trigger simulation
- full EEMC acceptance
2.0 Definition of Isolation Cut
- 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.
- See You do not have access to view this node for data vs MC comparison, including trigger simulation.
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.
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.
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
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.