Combination of searches for nonresonant Higgs boson pair production in proton–proton collisions at; ; ; ; s; ; =; 13; ; ; TeV; ; ; Journal Article uri icon

Overview

abstract

  • Abstract; ; This paper presents a combination of searches for the nonresonant production of Higgs boson pairs (HH) in proton–proton collisions at a centre-of-mass energy of 13 TeV. The dataset was collected by the CMS experiment at the LHC from 2016 to 2018 and corresponds to a total integrated luminosity of 138 fb; ; ; ; ; ; ; ; ; ; −; 1; ; ; ; ; ; . The observed (expected) upper limit on the inclusive HH production cross-section relative to the standard model (SM) prediction is found to be 3.5 (2.5). Assuming all other Higgs boson couplings are equal to their SM values, the Higgs boson trilinear self-coupling modifier; ; ; ; ; ; ; ; ; κ; λ; ; ; =; ; λ; 3; ; ; /; ; ; λ; ; 3; ; SM; ; ; ; ; is constrained in the range; ; ; ; ; ; ; −; 1.35; ⩽; ; ; κ; λ; ; ; ⩽; 6.37; ; ; ; at 95% confidence level (CL). Similarly, for the coupling modifier; ; ; ; ; ; ; ; ; κ; ; 2; ; V; ; ; ; ; ; ; ; , which governs the interactions between two vector bosons and two Higgs bosons, we have excluded; ; ; ; ; ; ; ; ; κ; ; 2; ; V; ; ; ; ; =; 0; ; ; ; at more than five standard deviations for all values of; ; ; ; ; ; ; ; ; κ; λ; ; ; ; ; ; . At 95% CL, assuming that the other couplings are equal to their SM values,; ; ; ; ; ; ; ; ; κ; ; 2; ; V; ; ; ; ; ; ; ; is constrained in the range; ; ; ; ; ; ; 0.64; ⩽; ; ; κ; ; 2; ; V; ; ; ; ; ⩽; 1.40; ; ; ; . This work also investigates HH production in several new physics scenarios, using the Higgs effective field theory (HEFT) framework. The HEFT framework is further exploited to study various ultraviolet complete models with an extended Higgs sector and set constraints on specific parameters. An extrapolation of the results in the expected integrated luminosity following the high-luminosity upgrade of the LHC is also reported.;

publication date

  • September 1, 2026

Date in CU Experts

  • September 16, 2026 5:31 AM

author count

  • 0

Other Profiles

International Standard Serial Number (ISSN)

  • 0954-3899

Electronic International Standard Serial Number (EISSN)

  • 1361-6471

Additional Document Info

start page

  • 095001

end page

  • 095001

volume

  • 53

issue

  • 9