Resolving combinatorial ambiguities in dilepton t t ¯ event topologies with constrained M 2 variables

Debnath, Dipsikha; Kim, Doojin; Kim, Jeong Han; Kong, Kyoungchul; Matchev, Konstantin T.

doi:10.1103/PhysRevD.96.076005

Title: Resolving combinatorial ambiguities in dilepton $t \bar{t}$ event topologies with constrained $M_{2}$ variables

Journal Article · Mon Oct 09 00:00:00 EDT 2017 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.96.076005· OSTI ID:1398745

Debnath, Dipsikha; Kim, Doojin; Kim, Jeong Han; Kong, Kyoungchul; Matchev, Konstantin T.

We advocate the use of on-shell constrained $${M}_{2}$$ variables in order to mitigate the combinatorial problem in supersymmetry-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 ansätze for the unmeasured invisible momenta and therefore can be usefully applied to discriminate combinatorial ambiguities. We illustrate our procedure with the example of dilepton $$t\overline{t}$$ 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.

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Research Organization:: Univ. of Kansas, Lawrence, KS (United States); Univ. of Florida, Gainesville, FL (United States); European Organization for Nuclear Research (CERN), Geneva (Switzerland)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0010296; FG02-12ER41809; SC0007863

OSTI ID:: 1398745

Alternate ID(s):: OSTI ID: 1498897

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 96 Journal Issue: 7; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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