| ATLAS Slides | |
| Report number | ATL-PHYS-SLIDE-2024-575 |
| Title | Measurement of off-shell Higgs boson production in the $H^*\to ZZ\to 4\ell$ decay channel |
| Author(s) | Sandesara, Jay Ajitbhai (University of Massachusetts (US)) |
| Corporate author(s) | The ATLAS collaboration |
| Collaboration | ATLAS Collaboration |
| Submitted to | Higgs 2024, Uppsala, Se, 4 - 8 Nov 2024 |
| Submitted by | jay.ajitbhai.sandesara@cern.ch on 12 Nov 2024 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ATLAS |
| Free keywords | Higgs ; Off-shell Higgs ; H to ZZ ; Neural Simulation Based Inference ; NSBI ; HIGGS |
| Abstract | A measurement of off-shell Higgs boson production in the $H^*\to ZZ\to 4\ell$ decay channel is presented. The measurement uses the 140~fb$^{-1}$ of integrated luminosity collected by the ATLAS detector during the Run 2 proton-proton collisions of the Large Hadron Collider at $\sqrt{s}=13$~TeV and supersedes our previous result in this decay channel using the same data set. The data analysis is performed using a neural simulation based-inference method, which builds per-event likelihood ratios using neural networks. The significance of the evidence for off-shell Higgs boson production is increased by 50\% when compared to our previous result. When combined with our most recent measurement in $ZZ\to 2\ell 2\nu$ decay channel, the evidence for off-shell Higgs boson production has an observed (expected) significance of $3.8\sigma$ ($2.4\sigma$). |
Record created 2024-11-12, last modified 2024-11-12