Continuing my investigations into the time variation of the cross section, focusing on the mass dependence ...

Figure 1: This figure shows the ratio of the dijet mass spectrum from a number of days to the mass spectrum from days 170 - 179. Each period has been normalized in a specific way: in the top figure, the periods are normalized by their integrated luminosity, in the middle figure they are normalized by VPDMB counts, and in the bottom figure they are normalized by the number of dijet events recorded for that period. Each figure contains three panels, the top left panel shows the results using full jet reconstruction, the top right panel shows the results using the EMC only reconstruction, and the bottom left panel shows the results using the TPC only reconstruction.

Figure 2: Same as figure 1 but now showing the jet pt spectra for the jets which make up the dijet. Here I only show the Luminosity and the total number of dijets normalizations.

Figure 3: Same as figure 2 but now showing the spectrum of individual track pTs for tracks making up the dijet.

Figure 4: Same as figure 2 but now showing the spectrum of individual tower eTs for towers making up the dijet.

Below are profile plots showing the average dijet mass and average jet pt as a function of run index. The dijet mass is fit with three pol0 functions, the first runs from the begining of the run to the RFF - FF transition at index 525, the second runs from index 526 to index 900 (here RDO board 6 in sector 18 died) and the final fit runs from 901 to the end. The jet pt is fit with three pol0 functions as well, but now the first fit extends to index 600, where RDO board 1 in sector 18 died.

Figure 5: Profile plot showing the average dijet mass as a function of run. The three panels are again: full jet reconstruction (upper left), EMC only reconstruction (upper right), and TPC only reconstruction (bottom left.

Figure 6: Same as figure 5 but now showing average jet pt for the jets which make up the dijet. Note the different fit ranges.

To get a better sense of when RDO boards went out, I look several track quantities which should be sensitive to these failures on a sector by sector basis.

Figure 7: The average NHitsFit for tracks which reside in sector 18.

Figure 8: The average NHitsPossible for tracks which reside in sector 18.

Figure 9: The average Chi2 for tracks which reside in sector 18.

Figure 10: The average DcaD for tracks which reside in sector 18.

Figure 11: The average DcaZ for tracks which reside in sector 18.

Figure 12: The average track pt for tracks which reside in sector 18.