Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 52: Higgs-Zerfälle in Fermionen II

T 52.10: Vortrag

Mittwoch, 27. März 2019, 18:15–18:30, H04

Study Towards Analysing the Higgs Self-Coupling in the gg → hh → 4τ Channel at the ATLAS Detector — •Henrik Junkerkalefeld, Klaus Desch, Christian Grefe, and Philip Bechtle — Physikalisches Institut, Bonn, Germany

The Higgs boson discovery at the LHC in 2012 completes the predicted particle content of the Standard Model (SM) leaving not much space for BSM physics in the accessibly TeV scale. This heralds the precision measurement era of SM parameters of which the Higgs self-coupling is one of the last unmeasured ones. Its high sensitivity to new physics scenarios further increases its relevance. Due to the very small cross sections, the power of the LHC to measure the self-coupling is estimated to be limited, which motivates the investigation of this process in as many channels as possible.

Apart of more intensively studied decay channels, the hh→4τ channel shapes up as a very promising additional decay because a very limited amount of other processes is expected to produce four truth taus. However, a large background containing several sources of QCD jets can fake hadronically decaying tau leptons and has to be fought.

This work studies the conspicuity of dihiggs production within multi-tau events. To that effort, a novel method to increase the efficiency of detecting events with many truth taus and separating them from fake taus is developed. Moreover, the dominating background is studied and first attempts to separate the very similar process ZZ→4τ from the background are made.