By M. Mulleitner
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The significance of the 2-jet signal topology can therefore be spoiled by the radiatively corrected background process if partons are collinear or one of the partons is rather soft thus faking a 2-jet final state. This background has to be suppressed by applying stringent cuts. The two-jet configuration due to soft or collinear partons involves large double logarithms [49–52]. In order to properly take into account higher order corrections the logarithms have to be resummed leading to the well-known Sudakov form factor  denoted by Fg which corresponds to the emission of soft real and the exchange of soft virtual gluons and a non-Sudakov form factor Fq related to soft virtual quark contributions [51, 52].
Above MA ≈ 230 GeV, the threshold for the χ˜01 χ ˜02 production is reached and the neutralino channel opens. It does not acquire any LO background and interference contributions due to neutralinos. The kinks and peaks in the signal curve correspond to the various chargino thresholds and the tt¯ threshold. The neutralino branching fraction drops when the chargino channels open up. On the other hand the γγA form factor peaks when the χ ˜+ ˜− ˜+ ˜− 1χ 1 and χ 2χ 2 thresholds are reached. The signal cross section amounts up to a few fb.
The τ ± charge is unity so that the background is large. Since the τ mass is rather small 42 CHAPTER 3. 14: Full lines: The signal cross sections of the processes γγ → tt¯ (tan β = 7) and γγ → τ + τ − (tan β = 7, 30) for µ = M2 = 200 GeV. Dashed lines: Background processes only. 7]. a cut in cos θ is worthwhile. 7. Nevertheless for moderate values of tan β = 7 the signal is too small compared to the background cross section to reach significances above 5. The situation changes for larger values of tan β since the branching fraction of A → τ + τ − increases with tan β as can be inferred from Fig.