Constraining off-shell Higgs boson production and the Higgs boson total width using WW→ ℓνℓν final states with the ATLAS detector

2025/04/10 by ATLAS Collaboration
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2504.07710

Abstract

A measurement of off-shell Higgs boson production is performed in the H^* → WW channel. The measurement uses a proton-proton collision dataset with an integrated luminosity of 140 fb^-1 collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. Final states in which both W bosons decay leptonically are targeted, and events are categorised based on the flavour of the final-state leptons, the jet multiplicity, and the output of neural-network-based classifiers. The data are found to be compatible with the Standard Model expectation. An observed (expected) upper bound on the 95% symmetric confidence level interval is set on the rate of off-shell Higgs boson production at a value of 3.4 (4.4) times the Standard Model prediction. These results are combined with the results from the measurement of on-shell Higgs boson production in the same final states to obtain an observed (expected) upper bound at 95% confidence level on the Higgs boson total width of 13.1 (17.3) MeV.

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Related

• Measurement of off-shell Higgs boson production in the H^*→ ZZ→ 4ℓ decay channel using a neural simulation-based inference technique in 13 TeV pp collisions with the ATLAS detector
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