This is my first look at various dijet kinematic quantities using the 2009 200GeV dataset.

I looked at the first 20 runs from Pibero's Spin 2010 list.

For some of the kinematic quantities, I have ploted the distributions for the six jet topologies: East Barrel - East Barrel, West Barrel - West Barrel, East Barrel - West Barrel, East Barrel - Endcap, West Barrel - Endcap, and Endcap - Endcap. I define the east barrel as -1.0 < eta < 0.0, the west barrel as 0.0 <= eta < 1.0 and the endcap as 1.0 <= eta. I use the detector eta of the jets when determining the jet topology.

I define the invariant mass as: M = Sqrt[2*P_T3*P_T4*(Cosh(eta₃-eta₄)-Cos(phi₃-phi₄))]

I define x1 as: x₁ = (M/Sqrt[s])*Exp[0.5*(eta₃-eta₄)]

I define x2 as: x₂ = (M/Sqrt[s])*Exp[-0.5(eta₃-eta₄)]

Figure 1: This figure shows the pt, eta and phi distributions of the two jets in each dijet event.

Fig 2: This plot shows the eta-phi distributions of the two jets in each dijet event.

Figure 3: This figure shows the pt-pt, eta-eta, and phi-phi correlations between the two jets in each dijet event.

Figure 4: This figure shows the eta-eta distribution of two jets. The top pannel is for the entire acceptance. The bottom pannel shows the quantity for 6 different jet position combinations in the detector. Top row left to right: east barrel - east barrel, west barrel - west barrel, and east barrel - west barrel. Bottom row left to right: east barrel - endcap, west barrel - endcap, endcap - endcap.

Figure 5: This figure has the same setup as figure 4, but is displaying the reconstructed value of cos(theta*). This distribution looks odd to me.

Figure 6: This figure has the same setup as figs 4 and 5 but is showing the dijet invariant mass.

Figure 7: This figure has the same setup as those above and shows the ratio of reconstructed x1 over reconstructed x2.

Figure 8: This figure has the same setup as those above and shows the reconstructed x1 and x2 values.

Figure 9: This figure has the same format as those above and shows reconstructed x1 vs reconstructed x2.