Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 89: Higgs Boson: Decay in Fermions 2
T 89.4: Vortrag
Donnerstag, 24. März 2022, 17:00–17:15, T-H20
Effective Field Theory interpretations in Higgs boson pair production studies and constraints on the Higgs boson self-coupling — •Christina Dimitriadi1,2, Jochen Dingfelder1, Arnaud Ferrari2, Tatjana Lenz1, and Serhat Ördek2 — 1Physikalisches Institut Universität Bonn, Germany — 2Uppsala University, Sweden
After the discovery of the Higgs boson in 2012, an important test of electroweak symmetry breaking would be to establish evidence of the Higgs boson self-coupling (λHHH), which can be achieved through a measurement of Higgs boson pair production. In the Standard Model (SM), di-Higgs events are dominantly produced in gluon-gluon fusion processes, e.g. involving the Yukawa coupling to top quarks (top quark loops) or via the Higgs boson self-coupling. These two production mechanisms interfere destructively, which leads to a very small di-Higgs production cross-section. However, deviations in couplings of the Higgs boson from the SM expectation could lead to a significant enhancement of the di-Higgs production rate.
A re-interpretation of the search for non-resonant Higgs boson pair production in the bbττ channel, which is one of the most sensitive for probing the Higgs self-coupling, is presented. A scan of the self-coupling modifier, κλ= λHHH/λHHHSM, is performed and limits on κλ are set. Projected sensitivity results at the High-Luminosity LHC are also discussed. Finally, preliminary studies for Higgs Effective Field Theory interpretations of the existing analysis are shown.