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24 April 2024 |
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Resolving Combinatorial Ambiguities in Dilepton $tar t$ Event Topologies with Constrained $M_2$ Variables | | Dipsikha Debnath
; Doojin Kim
; Jeong Han Kim
; Kyoungchul Kong
; Konstantin T. Matchev
; | | Date: |
Thu, 15 Jun 2017 17:59:57 GMT (1863kb,D) | | 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 $tar{t}$ 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. | | Source: | arXiv, 1706.4995 | | Services: | Forum | Review | PDF | Favorites | |
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