Abstract
The final ATLAS Run 1 measurements of Higgs boson production and couplings in the decay channel <mml:math display="inline">H<mml:mo stretchy="false">→</mml:mo>ZZ*<mml:mo stretchy="false">→</mml:mo>ℓ+ℓ-ℓ′+ℓ′-</mml:math>, where <mml:math display="inline">ℓ</mml:math>, <mml:math display="inline">ℓ′=e</mml:math> or <mml:math display="inline">μ</mml:math>, are presented. These measurements were performed using <mml:math display="inline">pp</mml:math> collision data corresponding to integrated luminosities of 4.5 and <mml:math display="inline">20.3 fb-1</mml:math> at center-of-mass energies of 7 and 8TeV, respectively, recorded with the ATLAS detector at the LHC. The <mml:math display="inline">H<mml:mo stretchy="false">→</mml:mo>ZZ*<mml:mo stretchy="false">→</mml:mo>4ℓ</mml:math> signal is observed with a significance of 8.1 standard deviations, with an expectation of 6.2 standard deviations, at <mml:math display="inline">mH=125.36 GeV</mml:math>, the combined ATLAS measurement of the Higgs boson mass from the <mml:math display="inline">H<mml:mo stretchy="false">→</mml:mo>γγ</mml:math> and <mml:math display="inline">H<mml:mo