# Higgs total width at the ATLAS experiment

- Institution: CERN
- Department: LHC Seminar
- Speaker: Rafael Coelho Lopes De Sa
- Year: 2022
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3013525)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

With a value of about 4 MeV, the total width of the Higgs boson in the Standard Model is not accessible via direct measurements at the LHC as the experimental resolution is around 1 GeV.

Instead, a comparison of off-shell and on-shell Higgs boson production can reveal the value of the width under mild assumptions on the Higgs boson couplings. This seminar presents a new measurement of the Higgs boson off-shell production and its natural width based on the full Run 2 pp dataset collected at 13 TeV. The measurement exploits the gluon-fusion and vector-boson fusion production modes, and the decays channels into ZZ→4l and ZZ→2l2v. The background-only hypothesis is rejected with an observed (expected) significance of 3.2 (2.4) 𝜎, which marks the experimental evidence of off-shell Higgs production.

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## Lectures

1. [Higgs total width at the ATLAS experiment](https://invisiblenetwork.ai/learn/cern/3013525/cb12bdc9768c), 58 min (CERN's player)