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T: Fachverband Teilchenphysik

T 55: Search for new particles III

T 55.2: Vortrag

Mittwoch, 1. April 2020, 16:45–17:00, H-HS XVI

Search for new Physics in Boosted HH → bbττ Decays — •David Kirchmeier, Wolfgang Mader, and Arno Straessner for the ATLAS collaboration — TU Dresden

The resonant and non-resonant production of two Higgs bosons play an important role in the investigation of the Higgs self-coupling and in searches for physics beyond the Standard Model. Due to the relatively high Higgs mass and its narrow width, decays into two Higgs bosons are ideal e.g. in searches for heavy Higgs bosons. Furthermore the HH → bbττ decay channel is promising as the Higgs decay into a pair of b quarks has the highest branching ratio, while the decay into ττ final states has still a moderately high branching ratio and allows good separation against multi-jet background.

In particular the regime of very high mass resonances above 1 TeV is experimentally challenging. The high boost of the two b quarks and the two τ leptons lead to signatures with close-by pairs of b jets and τ decays in the ATLAS detector and requires dedicated experimental techniques to tag those topologies. This talk presents how the search for new physics in the bbττ final state is extended to the regime of high mass resonances above 1 TeV. For that purpose the latest developments in the identification of highly boosted τ pairs in the fully hadronic decay channel are presented. It will be shown how these new techniques are applied in a search for new physics in the bbττ final state. The latest results using the full Run-2 dataset of 139 fb⁻¹ will be shown.