This page details my investigation into differences between the 12 point jet tree branch and the emc only jet tree branch.

The plots shown contain the first ~20 runs from Pibero's list of good runs used for spin 2010. Only events which fired the dijet or random portion of the L2JetHigh trigger are shown here. (The inclusion of JP1 triggered events will come soon). The analysis is divided into two catagories, the jet finder found an equal number of jets in the two branches and the jet finder found an unequal number of jets in the two branches. Each of these is then divided into jets which are associated with a jet patch which fired L2JetHigh and jets which are not associated. The plots are below:

Equal number of jets, jets associated with jet patch

Equal number of jets, jets not associated with jet patch

Unequal number of jets, jets associated with jet patch

Unequal number of jets, jets not associated with jet patch

I match jets between branches by finding the pair of jets which minimizes the quadrature sum of the phi difference and eta difference of the jets from the two branches. In addition, I require the eta difference between the jets from different branches to be <= 0.5 and the phi difference to be <= 1.0. The eta and phi differences as well as the quadrature sum can be seen on P3 of the pdf files.

After the matching between 12 point and emc jets are done, I look at the difference in pt, eta, and phi between the jets from the different branches. I also plot the quadrature sum of the eta and phi difference. These can be seen on P7 and P8 of the pdf files. P9 and P10 show the same things as P7 and P8, but now I compare only the tower component of the 12 point branch jet to the emc only jet.