Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 9: Higgs: Erweiterte Modelle

T 9.4: Vortrag

Montag, 25. März 2019, 16:45–17:00, S07

Combination of di-Higgs searches using 13 TeV data collected by the ATLAS detector — •Florian Beisiegel, Alessandra Betti, Jochen Dingfelder, Tatjana Lenz, Alexander Melzer, and Norbert Wermes — University of Bonn

The discovery of the Higgs boson in 2012 was a great success of modern particle physics since it served as a proof of the Higgs mechanism introduced in 1964. One focus of the current particle physics experiments at the LHC is the measurement of the Higgs properties, such as its coupling strengths to fundamental particles. In addition to the coupling of the Higgs boson to fermions and gauge bosons, the Higgs mechanism also predicts a Higgs self-coupling. The triple-Higgs self-coupling can be measured in the di-Higgs production channel (non-resonant production).

Di-Higgs analyses also facilitate the search for new heavy particles that decay to two Higgs bosons (resonant production).

By combining di-Higgs searches with different final states the upper limits on the di-Higgs production cross section can be further improved. This talk presents a combination of six different di-Higgs final states (HH → 4b, bbττ, bbγγ, bbWW, WWγγ, 4W) using 36.1 fb⁻¹ of data collected at √s = 13 TeV with the ATLAS detector. In addition to results on the resonant and non-resonant production modes, constraints on the Higgs self-coupling and interpretations in different BSM models will be shown.