Measurement of the Higgs boson mass from the H → ZZ∗ → 4l and H → γγ channels with the ATLAS detector at the LHC

This document presents an updated measurement of the Higgs boson mass with the combined fit of two decay channels $H\rightarrow ZZ^* \rightarrow4\ell$ and $H\rightarrow \gamma \gamma$. The analyses are based on $4.5$\,fb$^{-1}$ and $20.3$\,fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 7$\,TeV and $\sqrt{s} = 8$\,TeV respectively, recorded with the ATLAS detector at the LHC. This result includes improved energy-scale calibrations for photons, electrons, and muons, as well as other analysis improvements.