CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PROC-2020-123
Title	Measurement of differential cross sections and the Higgs mass in Higgs boson decays to bosons using the ATLAS detector
Author(s)	Laudrain, Antoine (Institut fuer Physik, Universitaet Mainz)
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Publication	SISSA, 2021
Imprint	17 Dec 2020
Number of pages	6
In:	PoS ICHEP2020 (2021) 066
In:	40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.066
DOI	10.22323/1.390.0066
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Higgs ; H4l ; four-lepton ; Hgamgam ; di-photon ; fiducial cross sections ; differential cross sections ; mass measurement ; Higgs mass ; HIGGS
Abstract	Despite small branching fractions, the $H \to \gamma\gamma$ and $H \to ZZ^* \to 4\ell$ Higgs boson decays provide clean and well reconstructed final states, allowing for precise measurements of the Higgs boson properties. These proceedings present measurements of total and differential fiducial cross sections in the $H \to \gamma\gamma$ and $H \to ZZ^* \to 4\ell$ decay channels, and a mass measurement in the $H \to ZZ^* \to 4\ell$ decay channel. The total fiducial cross section is measured to be $\sigma^{\gamma\gamma}_{\text{fid}} = 65.2 \pm 7.1$ fb in the $H \to \gamma\gamma$ channel and $\sigma^{4\ell}_{\text{fid}} = 3.28 \pm 0.32$ fb in the $H \to ZZ^* \to 4\ell$ channel, in agreement with the Standard Model predictions. Differential cross-section measurements are reported for Higgs boson production- and decay-related observables. The Higgs boson transverse momentum differential cross-section distributions are used to constrain the charm Yukawa coupling modifier (95% confidence level interval on $\kappa_c$ of $[-12, 11]$ in the $H \to 4\ell$ analysis and of $[-19, 24]$ in the $H \to \gamma\gamma$ analysis). Other differential distributions allow constraints on pseudo-observables and effective field theory coefficients. The Higgs boson mass in the $H \to ZZ^* \to 4\ell$ decay channel is measured to be $m_H = 124.92 \pm 0.19 \, \text{(stat.)}^{+0.09}_{-0.06} \, \text{(sys.) }$ GeV. All the results are derived using 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collisions collected with the ATLAS detector during the Run 2 of the LHC.
Copyright/License	publication: © 2021-2025 The Author(s) (License: CC-BY-NC-ND-4.0)

Corresponding record in: Inspire