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Compact Muon Solenoid
LHC, CERN

CMS-PAS-HIG-23-006
Constraints on the Higgs boson self-coupling with combination of single and double Higgs boson production
Abstract: A combination of Higgs boson (H) measurements and searches for the production of Higgs boson pairs (HH) is presented, aiming to constrain the H trilinear self-coupling λ3, using the proton-proton collision data collected by the CMS experiment at s= 13 TeV. The cross section of the main H production modes and the branching ratios of the principal decay channels depend on λ3 because of next-to-leading-order electroweak corrections. On the other hand, the cross section of the HH production via gluon fusion and via vector boson fusion depend on λ3 as well as on the H couplings to the top quark, and to vector bosons, respectively. The combination of event categories enriched in single-H and HH events allows the extraction of constraints on κλ, defined as the value of λ3 normalized to its standard model prediction, with fewer assumptions on the H couplings to the fermions and vector bosons. Values of κλ outside the interval 1.2<κλ< 7.5 are excluded at 95% confidence level, which is compatible with the expected range of 2.0<κλ< 7.7 under the assumption that all the other H couplings are at the standard model predicted values.
CMS Publications
Compact Muon Solenoid
LHC, CERN