Combined measurement of the Higgs boson mass from the $H\to\gamma\gamma$ and $H\to ZZ^{*} \to 4\ell$ decay channels with the ATLAS detector using $\sqrt{s}$ = 7, 8 and 13 TeV $pp$ collision data

TL;DR

This paper reports a precise measurement of the Higgs boson mass by combining data from two decay channels using the ATLAS detector, achieving a 0.09% precision with 140 fb$^{-1}$ of collision data.

Contribution

It presents the first combined measurement of the Higgs boson mass from multiple decay channels with unprecedented precision using LHC Run 2 data.

Findings

Higgs boson mass measured as 125.11 ± 0.11 GeV

Achieved 0.09% measurement precision

Combines $H o ZZ^{*} o 4 ext{l}$ and $H o ext{γγ}$ channels

Abstract

A measurement of the mass of the Higgs boson combining the $H\to ZZ^{*} \to 4\ell$ and $H\to\gamma\gamma$ decay channels is presented. The result is based on 140 fb$^{-1}$ of proton-proton collision data collected by the ATLAS detector during LHC Run 2 at a centre-of-mass energy of 13 TeV combined with the Run 1 ATLAS mass measurement, yielding a Higgs boson mass of 125.11 $\pm$ 0.09 (stat.) $\pm$ 0.06 (syst.) = 125.11 $\pm$ 0.11 GeV. This corresponds to a 0.09 % precision achieved on this fundamental parameter of the Standard Model of particle physics.