A search for the dimuon decay of the Standard Model Higgs boson with the ATLAS detector

Top, Higgs, diboson and electroweak fit to the Standard Model effective field theory

“…In a model-independent SMEFT analysis, one allows all the EFT operators contribution for the 2-parameter model T B, and verify in a representative example (the T field) that it has a negligible effect on the single-parameter model constraints. 17 We do not provide limits on the two-parameter model Ξ1, which has a complex coupling g Ξ 1 , but note that it behaves similarly to models Ξ and S1. 18 In the case of the T (vector-like quark) model, the mass limit has been obtained using the relation…”

“…16 The numbers shown in the tables should each be multiplied by the appropriate squared coupling factors and divided by the square of the mass scale M . 17 We show in figure 14 the results from our global fit for all of the one-parameter singlefield extensions of the SM. In each of these models we constrain a positive quantity: |λ| 2 .…”

“…Previous to the LHC, the most precise tests of the SM were those provided by measurements at LEP, notably at the Z peak [1] and in W + W − diboson production [2][3][4][5], and at the Tevatron, notably in measurements of the W [6] and top quark [7]. The LHC has added new classes of precise measurements, notably those of Higgs production and decays [8][9][10][11][12][13][14][15][16][17] and the production of the top quark in various modes at Run 1 and , the W mass [65], and also triple-gauge coupling measurements in diboson production [66][67][68][69][70] and Zjj production [71]. The SM is a tight theoretical framework that connects all these measurements.…”

Light quark Yukawas in triboson final states

“…We currently have firm evidence [1,2] that the Higgs couples to the 3 rd generation fermions (top, bottom, tau) with the strength predicted by the SM, within O(10%) accuracy. There is also preliminary evidence for the Higgs decays to muons [3,4], which is the first experimental verification of the SM Higgs mechanism at the level of the 2 nd generation fermions.…”

Radiative muon mass models and (g − 2)μ

“…This relation, which does not hold in radiative mass generation models, is being directly tested by Higgs measurements at the LHC. Until recently, these measurements were restricted to the thirdfamily fermions; however, with the first evidence that the Higgs decays to muons [1,2], the mass generation mechanism of the second family is now being directly probed as well. For both families, the current data are consistent with the SM, but, as we shall see, also leave open the possibility of radiative mass generation.…”