Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 28: Higgs-Zerfälle in Fermionen I
T 28.6: Vortrag
Dienstag, 26. März 2019, 17:20–17:35, H04
Constraints on the Higgs self-coupling from searches for Higgs boson pairs in the bbτ+τ− final state with the ATLAS detector and prospects at the High-Luminosity LHC — •Petar Bokan1,2, Stan Lai1, Arnaud Ferrari2, and Jason Veatch1 — 1University of Göttingen — 2Uppsala University
After the discovery of the Higgs boson, the ultimate test of the electroweak symmetry breaking is to establish Higgs self-coupling by searching for pairs of Higgs bosons.
A search for non-resonant Higgs boson pair production in the bbτ+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). The analysis considers the semi-leptonic and fully hadronic di-τ final states. The observed (expected) upper limit on the non-resonant Higgs boson pair production cross-section times branching ratio corresponds to 12.7 (14.8) times the predicted Standard Model cross-section. The ratio of the Higgs boson self-coupling to its Standard Model expectation, κλ, is observed (expected) to be constrained at 95% confidence level to −7.3<κλ<15.7 (−8.8<κλ<16.7).
Furthermore the sensitivity is extrapolated to a 14 TeV center-of-mass energy and 3000 fb−1, which is the target integrated luminosity of the High-Luminosity LHC. Various extrapolation assumptions are presented in this talk.