Measurement of the Higgs boson mass in the $H\rightarrow ZZ^* \rightarrow 4\ell$ and $H \rightarrow \gamma\gamma$ channels with $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector

TL;DR

This paper reports a precise measurement of the Higgs boson mass using decay channels $H ightarrow ZZ^* ightarrow 4 ext{leptons}$ and $H ightarrow ext{gamma gamma}$ with 13 TeV collision data from ATLAS, achieving a combined mass of approximately 125 GeV.

Contribution

The study provides the most precise Higgs boson mass measurement to date by combining multiple decay channels and collision energies using ATLAS data.

Findings

Higgs mass in $ZZ^*$ channel: 124.79 GeV

Higgs mass in $ ext{gamma gamma}$ channel: 124.93 GeV

Combined Higgs mass: 124.97 GeV

Abstract

The mass of the Higgs boson is measured in the $H\rightarrow ZZ^* \rightarrow 4\ell$ and in the $H\rightarrow \gamma\gamma$ decay channels with 36.1 fb$^{-1}$ of proton-proton collision data from the Large Hadron Collider at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector in 2015 and 2016. The measured value in the $H\rightarrow ZZ^* \rightarrow 4\ell$ channel is $m_{H}^{ZZ^{*}} = 124.79 \pm 0.37$ GeV, while the measured value in the $H\rightarrow \gamma\gamma$ channel is $m_{H}^{\gamma \gamma} = 124.93 \pm 0.40$ GeV. Combining these results with the ATLAS measurement based on 7 TeV and 8 TeV proton-proton collision data yields a Higgs boson mass of $m_H=124.97 \pm 0.24$ GeV.