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- W2626549269 abstract "We advocate the use of on-shell constrained $M_2$ variables in order to mitigate the combinatorial problem in SUSY-like events with two invisible particles at the LHC. We show that in comparison to other approaches in the literature, the constrained $M_2$ variables provide superior ansatze for the unmeasured invisible momenta and therefore can be usefully applied to discriminate combinatorial ambiguities. We illustrate our procedure with the example of dilepton $tbar{t}$ events. We critically review the existing methods based on the Cambridge $M_{T2}$ variable and MAOS-reconstruction of invisible momenta, and show that their algorithm can be simplified without loss of sensitivity, due to a perfect correlation between events with complex solutions for the invisible momenta and events exhibiting a kinematic endpoint violation. Then we demonstrate that the efficiency for selecting the correct partition is further improved by utilizing the $M_2$ variables instead. Finally, we also consider the general case when the underlying mass spectrum is unknown, and no kinematic endpoint information is available." @default.
- W2626549269 created "2017-06-23" @default.
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- W2626549269 date "2017-10-09" @default.
- W2626549269 modified "2023-10-13" @default.
- W2626549269 title "Resolving combinatorial ambiguities in dilepton tt¯ event topologies with constrained M2 variables" @default.
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- W2626549269 doi "https://doi.org/10.1103/physrevd.96.076005" @default.
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