Search for di-Higgs production to the b¯bτ +τ − final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in pp collisions at √s = 13TeV
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This thesis presents a search for resonant and standard model non-resonant
di-Higgs production in theb¯bτ +τ− decay channel, with the semi-leptonic ditau
state. The search uses data collected by the ATLAS experiment at the
LHC of pp-collisions at √s=13 TeV during 2015 and 2016, corresponding
to an instantaneous luminosity of 36:1fb-1. No deviation from the Standard
Model prediction is observed. For the non-resonant standard model di-Higgs
production an upper limit is set on the cross-section compared to the Standard
Model prediction,σ/σSM< 24:44 @ 95%CL. Upper limits are set on the cross-section
times branching ratio for the resonant searches, where the results are
interpreted in terms of constraints on a 2HDM heavy scalar Higgs model and
a Randall-Sundrum Kaluza-Klein graviton model. The use of Support Vector
Machines is investigated and benchmarked against the nominal results of the
Boosted Decision Tree multivariate analysis, in pursuit of potential future
improvements.
Authors
Stevenson, Thomas JamesCollections
- Theses [4209]