CMS-PAS-HIG-19-018

CMS-PAS-HIG-19-018
Search for nonresonant Higgs boson pair production in final states with two bottom quarks and two photons in pp collisions at $\sqrt{s}=$ 13 TeV
CMS Collaboration
October 2020

Abstract: A search for nonresonant production of Higgs boson pairs via gluon-gluon fusion and vector boson fusion in final states with two bottom quarks and two photons is presented. This search uses data from proton-proton collisions at a center-of-mass energy of $\sqrt{s}=$ 13 TeV recorded by the CMS detector at the LHC from 2016 to 2018, corresponding to an integrated luminosity of 137 fb$^{-1}$. No signal is observed, and a 95% confidence level upper limit is set on the product of the inclusive Higgs boson pair production cross section and branching fraction into $\gamma\gamma\mathrm{b\bar{b}}$. The observed (expected) upper limit is determined to be 0.67 (0.45) fb, which corresponds to 7.7 (5.2) times the standard model prediction. Assuming all other Higgs boson couplings are equal to their values in the standard model, the coupling modifiers of the trilinear self-coupling $\kappa_{\lambda}$ and the coupling between a pair of Higgs bosons and a pair of vector bosons $c_{2V}$ are constrained within the ranges $-3.3 < \kappa_{\lambda} < 8.5$ and $-1.3 < c_{2V} < 3.5$ at 95% confidence level. Constraints on $\kappa_{\lambda}$ are also set by combining this analysis with a search for single Higgs bosons produced in association with top quark-antiquark pairs, and by performing a simultaneous fit of $\kappa_{\lambda}$ and the top Yukawa coupling modifier $\kappa_{\mathrm{t}}$.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, JHEP 03 (2021) 257. The superseded preliminary plots can be found here.

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