Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 74: Higgs: Erweiterte Modelle II / Suchen

T 74.7: Vortrag

Donnerstag, 22. März 2018, 18:00–18:15, Philo-HS2

Search for new Physics in Boosted hh→ bbττ Decays at ATLAS. — •David Kirchmeier, Arno Straessner, and Wolfgang Mader — IKTP, TU Dresden, Germany

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 like they are predicted by supersymmetric theories or heavy Kaluza-Klein Gravitons. Furthermore the hh→ bbττ decay channel is promising as the Higgs decay into bb has the highest branching ratio, while the decay into ττ final states has still a moderately high branching ratio and allows good separation against QCD background.

In particular the regime of very high mass resonances above 1 TeV is experimentally challenging. The high boost of the b- and τ-pair systems lead to signatures with close-by pairs of b-jets and tau decays in the ATLAS detector and requires dedicated experimental techniques to tag those topologies. This talk presents a search for new physics in the highly boosted bbττ final state while also going into some of the latest developments in the identification of boosted hadronic τ pair decays in ATLAS.