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LHC Seminar

Higgs total width at the ATLAS experiment

by Rafael Coelho Lopes De Sa (University of Massachusetts (US))

500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium


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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.
Organized by

Michelangelo Mangano, Jan Fiete Grosse-Oetringhaus and Pedro Silva.....Refreshments will be served at 10h30

LHC seminar - 15 november - ATLAS
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