The latest results on production of Higgs boson pairs at 13 TeV by the ATLAS experiment at LHC are reported, including a combination of six different decay modes. Results include b (b) over bar tau(-)tau(+), b (b) over barb (b) over bar, b (b) over bar WW, WWWW and WW gamma gamma final states, and they are interpreted both in terms of sensitivity to the SM and as limits on kappa(lambda), a scaling of the triple-Higgs interaction strength. The most stringent constraint on di-Higgs production cross-section is set at 6.9 times SM cross-section and kappa(lambda)is constrained in the range -5-12 at 95% confidence level. A new search dedicated to the Vector-Boson-Fusion production was performed in thebb over bar bb over bar
Heavy dark matter through the dilaton portal
JOURNAL OF HIGH ENERGY PHYSICS
Authors: Fuks, Benjamin; Goodsell, Mark D.; Kang, Dong Woo; Ko, Pyungwon; Lee, Seung J.; Utsch, Manuel
Abstract
We re-examine current and future constraints on a heavy dilaton coupled to a simple dark sector consisting of a Majorana fermion or a Stuckelberg vector field. We include three different treatments of dilaton-Higgs mixing, paying particular attention to a gauge-invariant formulation of the model. Moreover, we also invite readers to re-examine effective field theories of vector dark matter, which we show are missing important terms. Along with the latest Higgs coupling data, heavy scalar search results, and dark matter density/direct detection constraints, we study the LHC bounds on the model and estimate the prospects of dark matter production at the future HL-LHC and 100 TeV FCC colliders. We additionally compute novel perturbative unitarity constraints involving vector dark matter, dilaton and gluon scattering.