Revisiting Combinatorial Ambiguities at Hadron Colliders with MT2
Abstract
We present a method to resolve combinatorial issues in multi-particle final states at hadron colliders. The use of kinematic variables such as MT2 and invariant mass significantly reduces combinatorial ambiguities in the signal, but at a cost of losing statistics. We illustrate this idea with gluino pair production leading to 4 jets + in the final state as well as tt production in the dilepton channel. Compared to results in recent studies, our method provides greater efficiency with similar purity
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