Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 4: Higgs Physics I

T 4.6: Talk

Monday, March 16, 2026, 17:30–17:45, KH 00.016

Studies towards a search for HHH production in the 4b2W channel in dilepton final states with CMS — •Parth Patil, Johannes Haller, Lara Markus, Mathias Frahm, Matteo Bonanomi, and Matthias Schröder — Institut für Experimentalphyisk, Universität Hamburg

The quartic coupling of the Higgs boson is an important parameter of the Standard Model (SM) Higgs sector and is related to the shape of the Higgs potential. Triple Higgs boson (HHH) production offers a direct probe of the quartic coupling. In the SM, HHH production is an extremely rare process evading current experimental sensitivity; however, the HHH production cross section can become large for non-SM scenarios, motivating a search for this process.

In this talk, studies towards a search for HHH production are presented, targeting events in which two Higgs bosons decay into bottom quark-antiquark pairs and one Higgs boson decays into a pair of W bosons, both of which decay leptonically. The analysis uses simulated data of the CMS experiment, corresponding to data-taking conditions at a center-of-mass energy of 13.6 TeV. Events are categorised based on the dilepton mass and b-tagged jet multiplicities, and deep neural networks are employed to discriminate the small signal from SM background processes.

Finally, a maximum likelihood fit is performed to establish expected exclusion limits on the HHH production cross section and constrain the quartic Higgs coupling.

Keywords: Higgs self coupling; Multi Higgs search; 4b2W(DL)