Tumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Damanakis, K.Dragicevic, M.2024-06-132024-06-1320231029-847910.1007/JHEP06(2023)1302-s2.0-85168333803https://doi.org/10.1007/JHEP06(2023)130https://hdl.handle.net/11501/931The first search for nonresonant production of Higgs boson pairs (HH) with one H decaying into four leptons and the other into a pair of b quarks is presented, using proton-proton collisions recorded at a center-of-mass energy of s = 13 TeV by the CMS experiment. The analyzed data correspond to an integrated luminosity of 138 fb?1. A 95% confidence level upper limit of 32.4 is set on the signal strength modifier ?, defined as the ratio of the observed HH production rate in the HH? ZZ?b b ¯ ? 4 ?b b ¯ decay channel to the standard model (SM) expectation. Possible modifications of the H trilinear coupling ? HHH with respect to the SM value are investigated. The coupling modifier ??, defined as ? HHH divided by its SM prediction, is constrained to be within the observed (expected) range ?8.8 (?9.8) < ?? < 13.4 (15.0) at 95% confidence level. [Figure not available: see fulltext.]. © 2023, The Author(s).eninfo:eu-repo/semantics/openAccessHadron-Hadron ScatteringHiggs PhysicsArticle6Q22023