Abstract
We study the production of Higgs bosons at high transverse momenta via vector-boson fusion (VBF) in the Standard Model Effective Field Theory (SMEFT). We find that contributions from four independent operator combinations dominate in this limit. These are the same ‘high energy primaries’ that control high energy diboson processes, including Higgs-strahlung. We perform detailed collider simulations for the diphoton decay mode of the Higgs boson as well as the three final states arising from the ditau channel. Using the quadratic growth of the SMEFT contributions relative to the Standard Model (SM) contribution, we project very stringent bounds on these operators that far surpass the corresponding bounds from the LEP experiment.
Highlights
Events ε [%] 369176.1 — 286704.2 77.66 274869.6 95.87 164813.0 59.96 161844.1 98.20 93105.4 57.53 20244.1 21.74 19876.9 98.19 8379.1 42.15 7896.7 94.24 2393.7 30.31Here ptruth refers to the vector of the truth values and ppred is the vector of prediction probabilities
We study the production of Higgs bosons at high transverse momenta via vector-boson fusion (VBF) in the Standard Model Effective Field Theory (SMEFT)
It was shown that by utilising the quadratic energy growth of the contributions of these operators with respect to the SM, the LHC sensitivity to probe these operators can far surpass LEP bounds. We show that these same high-energy primaries are sufficient to completely determine the SMEFT amplitude for Higgs production in the Vector Boson Fusion (VBF) channel if the transverse momentum of the Higgs boson is large
Summary
The vertices in the dimension-6 (D6) lagrangian that contribute to the VBF Higgs production are the following,. We will assume that these couplings are extended to all generations in a flavour universal way which is well justified if we assume Minimal Flavour Violation (MFV) [49] We show how these vertices give corrections to VBF Higgs production in figure 2. The qV → qh subprocess, is related to the Higgs-strahlung process, qq → V h, by crossing symmetry, as shown in figure 1 such that the expressions in eq (2.2) are identical to the corresponding ones for the qq → V h process if we interchange t → s This is very significant as it implies that VBF Higgs production at high transverse momentum probes the same set of EFT operators as qq → V h at high energies. In the last line of table 2, we connect these contact terms to the original definition of the high energy primaries in ref. [36]
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