The mass of the Higgs boson is measured in the <math><mi>H</mi><mo>→</mo><mi>Z</mi><msup><mrow><mi>Z</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>→</mo><mn>4</mn><mi>ℓ</mi></math> and in the <math><mi>H</mi><mo>→</mo><mi>γ</mi><mi>γ</mi></math> 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 <math><mi>H</mi><mo>→</mo><mi>Z</mi><msup><mrow><mi>Z</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>→</mo><mn>4</mn><mi>ℓ</mi></math> channel is <math><msubsup><mrow><mi>m</mi></mrow><mrow><mi>H</mi></mrow><mrow><mi>Z</mi><msup><mrow><mi>Z</mi></mrow><mrow><mo>⁎</mo></mrow></msup></mrow></msubsup><mo>=</mo><mn>124.79</mn><mo>±</mo><mn>0.37</mn><mspace width="0.25em"></mspace><mtext>GeV</mtext></math>, while the measured value in the <math><mi>H</mi><mo>→</mo><mi>γ</mi><mi>γ</mi></math> channel is <math><msubsup><mrow><mi>m</mi></mrow><mrow><mi>H</mi></mrow><mrow><mi>γ</mi><mi>γ</mi></mrow></msubsup><mo>=</mo><mn>124.93</mn><mo>±</mo><mn>0.40</mn><mspace width="0.25em"></mspace><mtext>GeV</mtext></math>. Combining these results with the ATLAS measurement based on 7 and 8 TeV proton–proton collision data yields a Higgs boson mass of <math><msub><mrow><mi>m</mi></mrow><mrow><mi>H</mi></mrow></msub><mo>=</mo><mn>124.97</mn><mo>±</mo><mn>0.24</mn><mspace width="0.25em"></mspace><mtext>GeV</mtext></math>.

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Measurement of the Higgs boson mass in the → → 4 And → Channels With TeV collisions using the ATLAS detector