Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 100: Higgs-Boson 8 (BSM-Zerfälle)

T 100.5: Vortrag

Donnerstag, 30. März 2017, 17:50–18:05, JUR 3

Search for BSM H→ττ in the dihadronic decay channel with ATLAS — •Lino Gerlach, Michel Janus, and Stan Lai — II. Physikalisches Institut, Georg-August-Universität Göttingen

In 2012, a scalar boson was found at CERN that is consistent with the properties of the Higgs boson predicted by the Standard Model of particle physics. Some theories, in particular supersymmetric models, also predict the existence of additional heavier neutral Higgs bosons. The decays of these hypothetical particles to a pair of τ leptons can have higher branching ratios compared to decays to other leptons because of the high mass of the τ lepton and additional effects of two-Higgs-doublet models that can enhance the coupling to the third generation of leptons.

In this talk, some details of the search for H→ττ in the dihadronic channel will be presented. Data is taken at the ATLAS experiment with a centre-of-mass energy of √s=13 TeV. Special emphasis will be put on the mass reconstruction algorithms used and the calculation of so-called fake rates. These describe the probability of a jet to be falsely identified as a hadronically decaying τ lepton and are a crucial ingredient in estimating the background.