Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 61: Higgs Boson: Decay in Bosons

T 61.4: Talk

Wednesday, March 23, 2022, 17:00–17:15, T-H20

Search for Di-Higgs production in the bbγγ final state with the ATLAS detector — •Florian Beisiegel, Jochen Dingfelder, and Tatjana Lenz — Physikalisches Institut, Uni 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 predicts Higgs self-coupling. The triple-Higgs self-coupling can be measured in di-Higgs (non-resonant) production. Di-Higgs analyses also facilitate the search for new heavy particles that decay to two Higgs bosons (resonant production).

This talk presents a search for di-Higgs production in the bbγγ final state using 139 fb⁻¹ of proton-proton collisions at 13 TeV recorded with the ATLAS detector. The analysis aims to measure the non-resonant SM di-Higgs production cross section and the Higgs self-coupling as well as search for resonant di-Higgs production. The focus is put on studies to improve the limits on the non-resonant production cross-section using a 2D fit in m_γγ and m_bb.