Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 10: Higgs: Erweiterte Modelle I

T 10.5: Talk

Monday, March 19, 2018, 17:00–17:15, Z6 - HS 0.004

Search for Higgs boson pair production in the γγ WW^* final state with a boosted topology using ATLAS data — •Kira Abeling, Joshua Beirer, Jason Veatch, and Stan Lai — II. Physikalisches Institut, Georg-August-Universität Göttingen

Since the discovery of the Higgs boson in 2012, many studies have been performed to compare its properties with Standard Model (SM) predictions. In particular, a direct measurement of the Higgs self-coupling is important to characterise the Higgs potential.

Furthermore, it is known that there must be physics beyond the SM. One set of extensions, known as two Higgs doublet models (2HDMs), predicts five Higgs bosons in total, of which two are CP-even and neutrally charged differing by their mass. The heavy Higgs boson, H, can decay in two light Higgs bosons, h, which have the properties of the discovered Higgs boson. The mass of the heavy Higgs is a free parameter and can exist within a large range.

In this talk, a search for di-Higgs production in the γγ WW^* decay channel using √s=13 TeV pp collision data collected by the ATLAS experiment in 2015 and 2016 is discussed. This channel combines the clean signal of the di-photon system and the high branching ratio of h→ WW^*. Since only large resonant masses are considered, the jets from the W boson decay cannot be resolved completely. This yields a boosted topology and the W boson decay products are collected in a single large-R jet. This talk covers analyses in both the fully hadronic and the 1-lepton final states.