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A search for nonresonant Higgs boson pair production in the$b\bar{b}b\bar{b}$ final state is presented. The analysis uses 126 fb$^{-1}$ of$pp$ collision data at $\sqrt{s}={13}$ TeV collected with the ATLAS detector atthe Large Hadron Collider, and targets both the gluon-gluon fusion andvector-boson fusion production modes. No evidence of the signal is found andthe observed (expected) upper limit on the cross-section for nonresonant Higgsboson pair production is determined to be 5.4 (8.1) times the Standard Modelpredicted cross-section at 95% confidence level. Constraints are placed onmodifiers to the $HHH$ and $HHVV$ couplings. The observed (expected) $2\sigma$constraints on the $HHH$ coupling modifier, $\kappa_\lambda$, are determined tobe $[-3.5, 11.3]$ ($[-5.4, 11.4]$), while the corresponding constraints for the$HHVV$ coupling modifier, $\kappa_{2V}$, are $[-0.0, 2.1]$ ($[-0.1, 2.1]$). Inaddition, constraints on relevant coefficients are derived in the context ofthe Standard Model effective field theory and Higgs effective field theory, andupper limits on the $HH$ production cross-section are placed in seven Higgseffective field theory benchmark scenarios.

physical review. d/physical review. d.

Search for nonresonant pair production of Higgs bosons in the  $b\bar{b}b\bar{b}$ final state in $pp$ collisions at $\sqrt{s}= 13$ TeV with  the ATLAS detector