2005 Inclusive Jet Trigger/Reconstruction Bias Comparison

 

The pT-shifts and trigger/reconstruction bias systematic calculations used in the 2005 inclusive jet PRL (100 2008, 34910) had to be redone for the combined 2005/2006 inclusive jet analysis.  They had to be redone to use the new trigger simulator StTriggerSimulator and to cut out electron-like jets following Murad's analysis (http://cyclotron.tamu.edu/star/2005n06Jets/eJets/).  Perfect agreement was not expected from the two analysis before cutting electron-like jets because: 1- different jet trees were generated for each result which could introduce slight changes in the number of events per pythia sample, 2- slightly different jet cuts were used, and 3- small changes to StEmcSimulatorMaker.  

The first figure shown here is comparison of the pythia mean values calculated by me (y-axis) and by Renee (x-axis).  The blue line is a slope=1 line that is meant only to guide the eye - it is not a fit.  Values are compared for the four main GRSV curves and four seperate trigger combinations.

 

There is some fluctuation but there is good overall agreement between the two analyses.  Removing the electron-like jets in my analysis causes the pT-Shifts to decrease.  See Murad's post referenced above for more details, but we are removing Geant jets with reconstructed energies much higher than their Pythia jet energies and therefore removing some of the most biased jets in our sample.  The plot below shows same figure after removing these jets (electron-like jets are only removed from HT triggers):

 Values and uncertainties on the Geant shifted asymmetries were also compared to Renee's calculations for consistency.  In the figures below my values are the red triangles and Renee's are the black points.  The electron-like jets cut has been applied to my points below.  The error bars agree well between the two analyses, and even though there is some difference between the values from the two analyses they are consistent and within expected fluctuations.