Half-time PhD seminar: search for pairs of Higgs bosons in the b b tau tau decay channel with the ATLAS detector

Abstract:

After the discovery of the Higgs boson, the ultimate test of the electroweak symmetry breaking is to establish Higgs self-coupling by searching for the pair production of Higgs bosons. A search for non-resonant and resonant Higgs boson
pair production in the b b τ τ  channel is presented for 36.1 fb −1 of √s = 13 TeV data recorded at the ATLAS experiment at the Large Hadron Collider (LHC).

In addition to the pair of b-tagged jets, the analysis considers semi-leptonic and fully hadronic di-tau-lepton final states. These results are extrapolated to a 14 TeV center-of-mass energy and 3000 fb−1 , which is the target integrated luminosity of the High Luminosity LHC to provide an estimation of the sensitivity to the Higgs self-coupling strength. Different trigger scenarios and possible reductions of the systematic uncertainties are discussed.

The b b τ τ results are combined with the results obtained from studying the
b b b b and b b γ γ decay channels and presented as well.