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The resulting masses [20-291 are shown as scatter plots in Figures 20-30 and 20-31. Clearly the allowed masses are highly correlated. The width of the distributions of the difference between true and reconstructed mass is about +3% for the squark mass, shown in Figure 20-32, +6% for the jig mass, +9% for the slepton mass, and +12% for the jip mass, shown in Figure 20-33. The widths of these distributions are mainly controlled by the error on the 1+1-q threshold. If this constraint were not included, the gp mass would be essentially undetermined.

This subsection contains a number of examples for the five LHCC points listed in Table 20-3. In some cases masses have been extracted by using the shapes of distributions and not just kinematic endpoints. 1 qR + jifq signature at Point 1 At Points 1 and 2 the branching ratio for qR + Xpq is near unity, so production of GR pairs gives rise to events with two hard jets, no other jets except those from QCQ radiation, and large missing transverse energy The following cuts were made [20-231 to extract the signal and reject Standard Model backgrounds: 644 l EFiss > 400 GeV; l two hard central jets with pT > 200 GeV and IqI < 2; l pT,1 +pT,2>500 l AR > 1 between the two jets; 20 GeV; Supersymmetry ATLAS detector and physics performance Technical Design Report 0 500 Volume II 25 May 7999 1000 1500 0 500 4 ,max (GeV) 200 1 1000 1500 P~,+~ (GeV) 250 r c n 200 iL i 150: c 100 1 50 F /o II 0 500 1000 1500 2000 MU (GeV) 0 ,,I 200 400 600 800 1000 P~,~ (GeV) Figure 20-35 Distributions for the signal plus background (curves) and background (shaded) of the pT of the hardest jet and the hardest two jets, the dijet mass, and the dijet pT’ for the iR production signal at Point 1.

0. For the dilepton sample the cuts are l EFiss > 300 GeV ; l at least two jets not tagged as b’s with pT > 100 GeV; l two opposite-sign, same flavour leptons with pT > 10 GeV . 20 Supersymmetry 839 Volume II 25 May 1999 ATLAS detector and physics performance Technical Design Report III, IIII IIII 800 - IIll_ signal - 100 .. SM backg _ 1 SUSY backg _ --_ 600 2 CLl % E 400 ? W 200 1 -I 800 Figure 20-26 Corrected mass distribution for two b - jets for Point 5 Higgs SUSY signal (solid), SUSY background (dashed) (dotted).

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ATLAS Detector, Physics Performance Tech Rpt - CH 20 [Supersymmetry]


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