The Higgs legacy of the LHC Run I

Abstract

Based on Run I data we present a comprehensive analysis of Higgs couplings. For the first time this SFitter analysis includes independent tests of the Higgs-gluon and top Yukawa couplings, Higgs decays to invisible particles, and off-shell Higgs measurements. The observed Higgs boson is fully consistent with the Standard Model, both in terms of coupling modifications and effective field theory. Based only on Higgs total rates the results using both approaches are essentially equivalent, with the exception of strong correlations in the parameter space induced by effective operators. These correlations can be controlled through additional experimental input, namely kinematic distributions. Including kinematic distributions the typical Run I reach for weakly interacting new physics now reaches 300 to 500 GeV.

The gauge-Higgs legacy of the LHC Run I

“…This is due to both operators contributing to the decay rate Hγγ. Without kinematic information the wide pattern in the upper left part simply extends to the lower right part [6,7]. The improvement in the region of large In the lower panels of figure 3 we depict the same two-dimensional profile likelihoods once we include the di-boson TGV measurements from LHC Run I; although LEP limits hardly have any numerical effect, they are included as well.…”

“…Their contributions to the several Higgs vertices, including non-SM Lorentz structures, are described in refs. [6,7]. Some of the operators in eq.…”

“…[6,7,[74][75][76]. We first construct Markov chains in the three-dimensional model space of f W , f B and f W W W .…”

“…For the sake of comparison we start with a brief summary of the global analysis of the LHC Run I Higgs data presented in refs. [6,7], where constraints on the dimension-six Wilson coefficients in eq. (2.3) are derived from Higgs measurements alone.…”

“…Already the LHC Run I allowed ATLAS and CMS to perform a large number of tests of the nature of the observed resonance, but no significant deviations from the Standard Model properties were observed for example in the Higgs production and decay rates [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. On the other hand, it is important to remind ourselves that the current constraints are still at a precision level for which no significant deviations would be expected in weakly interacting models of new physics [24].…”