Speaker
Description
The ongoing Standard Model Effective Field Theory (EFT) program at the LHC and elsewhere aims at charting the parameter space allowed for deviations from the SM coming from heavy Beyond Standard Model (BSM) physics. Possible hints of New Physics could appear as subtle correlated deviations in several observables but parameterized by a single parameter. Hence, the community has invested great effort in producing global fits of the SMEFT that consider hundreds of experimental data points from LHC experiments and others.
The SMEFiT collaboration, which I am part of, has produced the most ambitious global fit yet with more than 400 experimental data points, mostly from LHC Run 2, cutting-edge Bayesian statistical techniques, inclusion of NLO corrections and quadratic dependence on the WCs, automated support for future colliders and for UV models matched onto SMEFT (see 2404.12809 and 2309.04523).
Here, I will present one of our latest updates: the inclusion of double Higgs measurements from LHC Run 2 and its HL-LHC projections. This allowed us to fit the dimension-6 operator $c_H$ that modifies the Higgs potential for the first time and claim that double Higgs production is enough to constrain this operator in a large global fit. I will discuss possible correlations with other operators, RGE running effects, how FCC-ee could improve on double Higgs via 1-loop corrections, and the impact of this measurement on exploring concrete BSM models. Overall, we can assess the global impact of double Higgs measurements in the SMEFT framework now and in the future.
These results will be part of an upcoming paper (to be published before the workshop).
