Update Sept 5, 2008:  This is now obsolete, for current results see the post: 

http://drupal.star.bnl.gov/STAR/blog-entry/staszak/2008/sep/05/2005-inclusive-jet-pt-shifts-and-trigger-reconstruction-bias-take-2

Shown below is the Pythia jet pT(y-axis) vs. Geant jet pT(x-axis) for associated pythia-geant jets using 4 different trigger combinations.  The same figure is shown for the BBC-only Geant condition for comparison.  The simulation data is using y2004y geometry, including sets rcf1224-1230 and rcf1232-1233.  The number of events per pythia sample used is shown in this file as is the calculated partial cross sections used to weight the various sample relative to each other.

Jet/Event Cuts Used:

 - zVertex != 0

 - Geant ETA >0.2, <0.8

 - Geant jet pT >= 5.0

 - if (Geant jet pT < 6.15) neutral Energy Fraction <0.85

 - if (Geant jet pT > 6.15) neutral Energy Fraction <0.9

 - Murad's electron-like Jet Cut: http://cyclotron.tamu.edu/star/2005n06Jets/eJets/

 - Software Trigger Req't

 In order to determine the corrected location to plot each data jet pT bin, we numerically calculate the Pythia jet pT mean value for each Geant jet bin.  These are the black histogram values on the previous figure.  

To estimate the bias from our trigger and reconstruction we shift to these pythia mean pT values the reconstructed geant asymmetries.  For 2005 we have the ability to look at the 11 GRSV delta-G parameterizations and the 3 GS delta-G parameterizations.  The below figures show a comparison between three curves for each of these models: 1- Pythia A_LL values (blue point, lines), 2- Geant un-shifted A_LL values (black), and 3- Geant shifted A_LL values (red).  The high statistics trigger combination (HT2 || JP2) is the only one displayed here, but identical figures are attached at the bottom for the 3 other trigger combinations.

Note that the lowest bin and the two highest bins are not included in the final analysis.  Also, please see this drupal blog entry for a comparison of these means and asymmetry values with those calculated by Renee Fatemi used for PRL 100 (2008), 34910.

Attached here is a table listing the pythia mean pT values and asymmetry values for each parameterization and each Geant pT bin.