Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 45: Higgs Physics V (HH and Trilinear Coupling)

T 45.3: Vortrag

Mittwoch, 2. April 2025, 16:45–17:00, ZHG104

Background estimation for the di-Higgs process HH → bbτ⁻τ⁺ with Run3 data from the CMS experiment — •Ana Andrade, Nathan Prouvost, Bogdan Wiederspan, Marcel Rieger, Philip Keicher, Anas Haddad, Tobias Kramer, and Peter Schleper — University of Hamburg, Hamburg, Germany

The shape of the Higgs potential plays a crucial role in our understanding of vacuum stability. The potential is directly dependent on the Higgs boson self-coupling which, despite continuous efforts, has yet to be experimentally observed. One way to probe its existence is through double Higgs boson production, where one Higgs boson directly couples to two final state Higgs bosons. The predicted cross-section of such a decay depends on the self-coupling strength and can therefore be probed with experimental data.

Since double Higgs boson production has a cross-section several orders of magnitude smaller than that of background processes, the efforts to observe the self-coupling are heavily limited by statistics. The channel HH → bbτ⁻τ⁺ is a promising target for such analyses as it offers a good compromise between sufficient statistics and reasonable background contamination. A major challenge in background estimation stems from multi-jet events, as these are notoriously difficult to simulate. In this talk, I will present techniques to model background processes in such analyses, with Run 3 data.

Keywords: di-higgs; bbtautau; CMS; LHC; Run3