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T: Fachverband Teilchenphysik
T 100: Higgs-Boson 8 (BSM-Zerfälle)
T 100.4: Vortrag
Donnerstag, 30. März 2017, 17:35–17:50, JUR 3
BDT based search for neutral MSSM Higgs bosons in the fully hadronic τ-pair final state with ATLAS — •Max Märker, Dirk Duschinger, Wolfgang Mader, Lorenz Hauswald, Arno Straessner, and Sebastian Wahrmund — IKTP TU Dresden, Dresden, Germany
The Minimal Supersymmetric Standard Model (MSSM) extends the Higgs sector with an additional doublet leading to the prediction of five Higgs bosons, two charged and three neural bosons. At tree level the Higgs sector is fully described by the mass of the CP-odd Higgs boson, mA, and the ratio of the vacuum expectation values of the two Higgs doublets, tanβ. At large values of tanβ the couplings to b quarks or τ leptons are significantly enhanced.
In this talk, a new multivariate analysis based on boosted decistion trees (BDT) in the search for heavy, neutral Higgs bosons in the fully hadronic H→τ+τ− channel is presented. The dominant background processes are QCD multi-jet, Drell-Yan and W+jets production. To separate the signal from these backgrounds, two independent event categories are introduced, and the description of the multi-jet background is taken directly from data. Using the BDT analysis, an improved expected signal significance is observed when compared to a traditional cut-based analysis.