This page compares track dca distributions between data and simulation for tracks with less than 12 hit points ...

Up to this point, all my analyses have used the 12 point branch of the jet trees. This means that all the tracks included in the jets must have more than 12 hit points in the TPC. The jet trees can also contain a 5 point branch in which all tracks must have more than 5 hit points in the TPC. The 5 point branch allows tracks to extend to more forward eta. I hope that by moving to the 5 point branch, the size of the jet pt corrections needed as the jets move farther into the endcap will be reduced.

Before I can use the 5 point branch in an analysis, I need to make sure the track quantities match between data and simulation. Here I look at the data simu comparisons for the DCA quantities as well as some track kinematic distributions.

Figure 1: This figure shows the track NHits distribution vs track eta for tracks which are found in 5 point branch jets passing the L2JetHigh trigger. The top pannel shows data and the bottom pannel shows simulation. Note that at the MuDst level, 5 point tracking is only implemented for eta > 0.5. Similar plots can be seen here for JP1 triggered jets, Untriggered jets, and inclusive jets (all jets, no trigger conditions).

Figure 2: This figure shows the track phi data/simu comparison for tracks within jets which fire the L2JetHigh trigger (Note that the title an axis labels are incorrect). The leftmost pannel shows tracks for all NHits values, the middle pannel shows tracks with NHits=6 and the right pannel shows tracks with NHits=7. I believe the two features around phi=-0.5 and phi=2.0 are due to dead RDO boards in sectors 4 and 11 as seen here.

I have produced plots of the pt, eta, and phi spectra for tracks from the jets which make up my dijet sample. I have also plotted the tracks from all jets which pass my fiducial volume cuts (ie no trigger requirements, can have more than two highest pt jets), this is the inclusive sample. For the tracks which came from jets satisfying my dijet conditions, I have divided the spectra into tracks from jets which fire the L2JetHigh trigger, the JP1 trigger, and the untriggered jets. For each quantity, I look at all tracks, and tracks which have 6, 7, 8, 9, and 10 hit points. The PDF with these plots can be found here.

Figure 3: This plot shows the data/simu comparison for track DcaD. The tracks are from jets which pass my dijet requirements and satisfy the L2JetHigh trigger. The left pannel shows all tracks, the middle pannel shows tracks with 6 hit points and the right pannels shows tracks with 7 hit points.

Figure 4: This figure has the same setup as figure 3 but it shows the DcaZ spectra.

Figure 5: This figure has the same format as figure 3 but shows the magnitude of the full DCA vector.

A PDF containing plots for the different trigger samples as well as plots for NHits = 8, 9, and 10 can be found here.