Combination of searches for nonresonant Higgs boson pair production in proton-proton collisions at sqrt(s) = 13 TeV

CMS Physics Analysis Summaries
Report number	CMS-PAS-HIG-20-011
Title	Combination of searches for nonresonant Higgs boson pair production in proton-proton collisions at sqrt(s) = 13 TeV
Corporate author(s)	CMS Collaboration
Collaboration	CMS Collaboration
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	This note presents a comprehensive overview and statistical combination of searches for the nonresonant production of Higgs boson pairs (HH) using data from proton-proton collisions collected by the CMS experiment at the LHC from 2016 to 2018 at a centre-of-mass energy of $13~\mathrm{TeV}$, corresponding to a total integrated luminosity of $138~\mathrm{fb}^{-1}$. Upper limits at $95\%$ confidence level are set on the rate of the HH production. The observed (expected) upper limit on the inclusive production cross section relative to the standard model expectation is found to be 3.5 (2.5). Assuming all other Higgs boson couplings are equal to their values in the standard model, we exclude HH production at $95\%$ confidence level for values of the Higgs boson trilinear self-coupling modifier $\kappa_{\lambda}$ outside the range between $-1.39$ and 7.02. Similarly, for the coupling modifier $\kappa_{2\mathrm{V}}$ affecting the interaction between two vector bosons and two Higgs bosons, we exclude HH production for values outside the range between 0.62 and 1.42. This work also studies HH production in new physics scenarios, using the Higgs effective field theory parametrisation. An extrapolation of the results to the integrated luminosity expected after the high-luminosity upgrade of the LHC is also presented. $$\textit{This document has been revised with respect to the version dated November, 16, 2024.}$$
Related	superseded by: CERN-EP-2025-214
Email contact: cms-pag-conveners-higgs@cern.ch Fulltext in PDF Figure_014-a Figure_014-b Figure_013-b Figure_013-a Figure_012-b Figure_012-a Figure_008-b Figure_008-a Figure_009-c Figure_009-b Figure_009-a Figure_011-a Figure_011-b Figure_010 Figure_003-a Figure_003-c Figure_003-b Figure_004-b Figure_004-c Figure_004-a Figure_007-a Figure_007-b Figure_002-a Figure_002-b Figure_002-c Figure_006 Figure_005 Figure_001-b Figure_001-a Additional information for the analysis (restricted access)