Abstract: The 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 p s = 13TeV 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 u, defined as the ratio of the observed HH production rate in the HH -> ZZbb -> 4`bb 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.

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