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

Aad, Georges; Aakvaag, Erlend; Abbott, Braden Keim; Abdelhameed, Sara; Abeling, Kira; Abicht, Nils Julius; Abidi, Haider; Aboelela, Mohammed; Aboulhorma, Asmaa; Abramowicz, Halina

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

ATLAS

Collaboration

Dec 2, 2024

65 pages

e-Print:

2412.01548 [hep-ex]

Report number:

CERN-EP-2024-298

Experiments:

CERN-LHC-ATLAS

View in:

pdf

reference search3 citations

Citations per year

Abstract: (arXiv)

A measurement of off-shell Higgs boson production in the

H^*\to ZZ\to 4\ell

decay channel is presented. The measurement uses 140 fb

^{-1}

of proton-proton collisions at

\sqrt{s}=13

TeV collected by the ATLAS detector at the Large Hadron Collider and supersedes the previous result in this decay channel using the same dataset. The data analysis is performed using a neural simulation-based inference method, which builds per-event likelihood ratios using neural networks. The observed (expected) off-shell Higgs boson production signal strength in the

ZZ\to 4\ell

decay channel at 68% CL is

0.87^{+0.75}_{-0.54}

(

1.00^{+1.04}_{-0.95}

). The evidence for off-shell Higgs boson production using the

ZZ\to 4\ell

decay channel has an observed (expected) significance of

2.5\sigma

(

1.3\sigma

). The expected result represents a significant improvement relative to that of the previous analysis of the same dataset, which obtained an expected significance of

0.5\sigma

. When combined with the most recent ATLAS measurement in the

ZZ\to 2\ell 2\nu

decay channel, the evidence for off-shell Higgs boson production has an observed (expected) significance of

3.7\sigma

(

2.4\sigma

). The off-shell measurements are combined with the measurement of on-shell Higgs boson production to obtain constraints on the Higgs boson total width. The observed (expected) value of the Higgs boson width at 68% CL is

4.3^{+2.7}_{-1.9}

(

4.1^{+3.5}_{-3.4}

) MeV.

Note:

65 pages in total, author list starting page 48, 22 figures, 9 tables, submitted to Rep. Prog. Phys. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGP-2024-14

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

Citations per year

Evidence of off-shell Higgs boson production from 𝑍𝑍 leptonic decay channels and constraints on its total width with the ATLAS detector - Erratum

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