Combination of searches for nonresonant Higgs boson pair production in proton–proton collisions at s = 13 TeV
- 1CERN, Geneva, Switzerland
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.
Related
- Search for the nonresonant production of a pair of additional Higgs bosons in the type-X two-Higgs-doublet model in proton-proton collisions at √s = 13 TeV
- Search for nonresonant triple Higgs boson production in the final state with six bottom quarks in proton-proton collisions at √s = 13 TeV
- Search for nonresonant production of strongly coupled dark matter in proton-proton collisions at √s = 13 TeV
- Search for resonant and nonresonant production of pairs of dijet resonances with b jets in the final state in proton-proton collisions at √s = 13 TeV
- Combination of vector boson scattering measurements in leptonic final states in proton-proton collisions at √s = 13 TeV
BibTeX
@article{collaboration2026combination,
title = {{Combination of searches for nonresonant Higgs boson pair production in proton–proton collisions at s = 13 TeV}},
author = {the CMS Collaboration},
journal = {Journal of Physics G Nuclear and Particle Physics},
year = {2026},
month = jul,
doi = {10.1088/1361-6471/ae8ff1},
url = {https://doi.org/10.1088/1361-6471/ae8ff1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Combination of searches for nonresonant Higgs boson pair production in proton–proton collisions at s = 13 TeV
AU - the CMS Collaboration
PY - 2026
DA - 2026/07/24
JO - Journal of Physics G Nuclear and Particle Physics
DO - 10.1088/1361-6471/ae8ff1
UR - https://doi.org/10.1088/1361-6471/ae8ff1
AB - 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.
SN - 0954-3899
SN - 1361-6471
ER -