Abstract
We set constraints on the trilinear Higgs boson self-coupling, λ3, by combining the information coming from the W mass and leptonic effective Weinberg angle, electroweak precision observables, with the single Higgs boson analyses targeting the γγ,ZZ⁎,WW⁎,τ+τ− and b¯b decay channels and the double Higgs boson analyses in the bb¯bb¯,bb¯τ+τ− and bb¯γγ decay channels, performed by the ATLAS collaboration. With the assumption that the new physics affects only the Higgs potential, values outside the interval −1.8λ3SM<λ3<9.2λ3SM are excluded at 95% confidence level. With respect to similar analyses that do not include the information coming from the electroweak precision observables our analysis shows a stronger constraint on both positive and negative values of λ3.
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