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

Abstract

We set constraints on the trilinear Higgs boson self-coupling, ${\lambda }_3$, 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 $\gamma \gamma ,Z{Z}^{\ast },W{W}^{\ast },{\tau }^{+}{\tau }^{-}$ and $\bar{b}b$ decay channels and the double Higgs boson analyses in the $b\bar{b}b\bar{b},b\bar{b}b{\tau }^{+}{\tau }^{-}$ and $b\bar{b}b\gamma \gamma$ decay channels, performed by the ATLAS collaboration. With the assumption that the new physics affects only the Higgs potential, values outside the interval $-1.8{\lambda }_3^{\mathrm{SM}}<{\lambda }_3<9.2{\lambda }_3^{\mathrm{SM}}$ 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 ${\lambda }_3$.

Comments: 13 pages, 4 figures, to be submitted to Phys. Lett. B