Tumasyan, A.Adam, W.Andrejkovic, J. W.Bergauer, T.Chatterjee, S.Damanakis, K.Dragicevic, M.2024-06-132024-06-1320230031-90071079-711410.1103/PhysRevLett.131.0418032-s2.0-85167760550https://doi.org/10.1103/PhysRevLett.131.041803https://hdl.handle.net/11501/1275A search for nonresonant Higgs boson (H) pair production via gluon and vector boson (V) fusion is performed in the four-bottom-quark final state, using proton-proton collision data at 13 TeV corresponding to 138 fb-1 collected by the CMS experiment at the LHC. The analysis targets Lorentz-boosted H pairs identified using a graph neural network. It constrains the strengths relative to the standard model of the H self-coupling and the quartic VVHH couplings, & kappa;2V, excluding & kappa;2V 1/4 0 for the first time, with a significance of 6.3 standard deviations when other H couplings are fixed to their standard model values.eninfo:eu-repo/semantics/openAccessArticle437566864Q1131WOS:001062108700002Q1