I have rerun my QA, kinematic, false asymmetry, and dijet ALL statistics analysis originally seen here. I have made several changes between that analysis and this one. I have loosened the RT and sum track pt cuts and now use the full mass formula instead of the approximation where the individual jet masses are ignored. Studies focusing on these two changes can be found here and here.

I have run over 952 runs from Pibero's DIS inclusive jet list. The mapping between run index and run number can be seen here.

I impose a number of cuts to select good dijet events:

• valid spin4 value
• vertex rank > 0
• |Zvertex| < 90
• -0.7 <= detEta <= 1.7
• -0.8 <= eta <= 1.8
• jet RT <= 0.94 (only for barrel jets: det eta < 1.0)
  
• jet sum track pt >= 0.5 (only for barrel jets: det eta < 1.0)
  

The two highest pt jets meeting the above requirements become dijet candidates. To be counted as a dijet, one of these two jets must be geometrically matched to a jet patch which fired the L2JetHigh or JP1 triggers. In addition, the jets must be back to back in phi. The exact condition is: Cos(phi1-phi2)) <= -0.5 .

Figure 1 shows the statistical power of the dijet ALL measurments. I have divided the data into 9 invariant mass bins each 10 GeV wide. I have also split the data into four different topologies: Barrel - Barrel, East Barrel - Endcap, West Barrel - Endcap, and Endcap - Endcap. The uncertanty in on the ALL in each bin is given by the formula below:

 P_A and P_B are the polarizations of the beams, N++ is the number of dijets in that bin from events with the same helicity signs (N++ = N++ + N--), N+- is the number of dijets in a bin from events with the opposite helicity signs, R is the relative luminosity between helicity states, and the /Delta Ns are the square roots of the number of dijets of the given helicity configurations in that bin. The sum is over the number of runs. I use the relative luminosities without the bx cut as described in Joe's blog page.

Figure 1: Dijet ALL statistics for several dijet topologies. (Y-range selected to match projection plots).

Due to the difficulty in finding a scale which shows the size of all error bars clearly, I have attached a spreadsheet which gives the error and sqrt number of dijets in each bin in each topology.

Figures 2 - 4 below show various false asymmetry plots. A pdf which defines the false asymmetries and explains how I calculate the error can be found here.

Figure 2: This plot sumarizes the false asymmetries. The five pannels show the five different topologies: full acceptance, barrel - barrel, east barrel - endcap, west barrel - endcap, and endcap - endcap. Each pannel displays the four false asymmetries summed over all runs and all pt bins for that particular topology.

Figure 3: Dijet AL^Y false asymetries for the 5 dijet topologies summed over all runs and divided into pt bins.

Figure 4: Dijet AL^Y false asymetries for the 5 dijet topologies summed over all pt bins for each run seperately. The red line is the mean of the points and the green lines are +/- 3 sigma.

Figures 3 and 4 show two different measures of the yellow beam single spin false asymmetry. The analogous plots for the other 3 false asymmetries can be found in this pdf. In addition, I also have plots showing the size of the error bars of the false asymmetries as a function of run number. In figure 3, I show the yellow beam single spin false asymmetry summed over all runs as a function of invariant mass bin for the 5 different dijet topologies. Because of the scale, it can be hard to read off the asymmetry value and error bar size, so I have included this spreadsheet which lists the asymmetry value, number of entries, and error bar size for each bin in each topology for all four false asymmetries.

In addition to the asymmetry plots, I have generated some plots of dijet kinematic quantities. A pdf of all plots can be found here. Figures 5 and 6 below give two examples.

Figure 5: This figure shows the Pt, eta, and phi distributions of the two jets which make up dijet events.

Figure 6: This figure shows pt vs pt for the two jets which make up the dijet and also phi vs phi. The phi vs phi plot on the left is for dijets before the back to back condition and the plot on the right is for dijets after the back to back condition.

I have also made several QA plots. The plots show the average values of several event and dijet quantities as a function of runnumber. The red line gives the average value and the two green lines are the +/- 3sigma lines. A pdf of all QA plots can be found here.

Figure 7: Sample QA plot. The mean dijet mass, cosine center of momentum scattering angle, and jet pt balance are shown as a function of run index.