Higgs boson self-coupling constraints from single Higgs, double Higgs and electroweak measurements

• Main Authors: Giuseppe Degrassi, Biagio Di Micco, Pier Paolo Giardino, Eleonora Rossi
• Format: Article
• Language: English
• Published: Elsevier 2021-06-01
• Series: Physics Letters B
• Subjects: Higgs boson self-coupling; Electroweak observables; Single-Higgs measurements; Double-Higgs measurements
• Online Access: http://www.sciencedirect.com/science/article/pii/S0370269321002471

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.