We present an alternative method to extract the tt¯ cross-section from the muon plus jets channel in pp collisions at s = 7 TeV. In addition to a standard baseline selection, we also study the use of topological constraints to improve the measurement. Using the full 2010 dataset we obtain a result of 160.4 ± 15.0 stat+44.0 -42.0 (syst) ± 6.4(lumi) pb from our baseline analysis. By applying two different additional topological constraints this becomes 153.3 ± 17.3 stat+35.6 -30.7 (syst) ± 6.1(lumi) pb and 156.5 ± 23.7 stat+30.8 -30.5 (syst) ± 6.3(lumi) pb.
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