Here I show the effect that increasing the energy the jet finder sees in the endcap has on the jet pt and eta spectra.

Studies with MIPs and pion reconstruction in the endcap seem to show that the detector gains have dropped about 7% since 2006. I am trying to determine what affect that gain drop has on my simulation / data comparisons. As a first stab at exploring this effect, I have recreated 20 data jet trees using a modified jet finder which artificially increases the amount of energy seen in the endcap by 10%.

Figure 1: This plot compares the jet L2 Pt spectra for the data sample with the normal endcap energy and the data sample with the endcap energy increased by 10%.

Figure 2: This plot compares the jet JP Pt spectra for the data sample with the normal endcap energy and the data sample with the endcap energy increased by 10%.

Figure 3: This plot compares the jet L2 Eta spectra for the data sample with the normal endcap energy and the data sample with the endcap energy increased by 10%.

Figure 4: This plot compares the jet JP Eta spectra for the data sample with the normal endcap energy and the data sample with the endcap energy increased by 10%.

Figure 5: The top two plots compare the L2 jet eta spectra from my simulation to the data with the normal endcap energy and the bottom two plots compare my simulation to the data with the increased endcap energy.

Figure 6: The top two plots compare the JP jet eta spectra from my simulation to the data with the normal endcap energy and the bottom two plots compare my simulation to the data with the increased endcap energy.

Figure 7: Same as figure 5 with the x axis rebinned.

Figure 8: Same as figure 6 with x axis rebinned.