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T: Fachverband Teilchenphysik

T 48: BSM Higgs 2 (extended Higgs sectors)

T 48.3: Vortrag

Dienstag, 5. März 2024, 16:30–16:45, Geb. 30.41: HS 3

Non-prompt lepton background estimate in the split-boosted 1-lepton X → SH→ bbWW analysis at ATLAS — •Lena Schulz, Stan Lai, and Kira Abeling — II. Physikalisches Institut, Georg-August-Universität Göttingen

The known incompleteness of the Standard Model gives rise to many theories of physics beyond the Standard Model. Many of those theories predict the existence of additional particles, motivating the search for new signatures.
This talk will focus on the resonant production of a Higgs boson in conjunction with an additional scalar particle S in the X→ HS→ bbWW decay channel with one lepton in the final state. Depending on the masses of the resonance X and the particle S, multiple possible topologies arise for this decay channel. The split-boosted topology, which will be the focus of this talk, is characterized by a sufficiently large separation between the two W bosons, allowing for the resolution of the final-state lepton from the jet of the hadronically decaying W boson, whilst the hadronic decay products of the Higgs boson and the W boson are too collimated to be resolved.
In the one lepton final state, non-prompt leptons contribute to the background of the decay channel. A data driven approach is presented to model this non-prompt lepton background.

Keywords: Higgs; Searches; bbVV; Split-Boosted; Background Estimate