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Therefore, the smaller of the two masses formed from the Higgs plus one of these two hardest jets should have an endpoint given by Equation 20-8. This distribution is shown in 840 20 Supersymmetty , ATLAS detector and physics performance Technical Design Report Volume II 25 May 1999 Figure 20-27 and indeed exhibits the expected endpoint. If the remaining masses in Equation 20-8 are known from other measurements, then the estimated error on the qL mass is +lO GeV for 30 fb-’ , dominated by the jet energy scale [20-261.

The most important effect of large tanp is that the splitting between the 2, and the other slep. tons IS mcreased. If m1,2 is small enough so that X,”+ Xyh and 220+ ji$Q are forbidden and m. large enough that ~20+ 1L, RI is also forbidden, then the only allowed two-body decays for the light gauginos can be jiz + ZT and xf + 2~~. 7 can be used. 20 Supersymmetry 649 Volume II 25 May 7999 ATLAS detector and physics petformance Technical Design Report SUGRA Point 6 in Table 20-3 is an example of such a point.

The Higgs signal comes from a mixture of gluino and squark production, but in most cases the two hardest jets come from the squark decays whether they are produced directly or in gluino decays. Therefore, the smaller of the two masses formed from the Higgs plus one of these two hardest jets should have an endpoint given by Equation 20-8. This distribution is shown in 840 20 Supersymmetty , ATLAS detector and physics performance Technical Design Report Volume II 25 May 1999 Figure 20-27 and indeed exhibits the expected endpoint.

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


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