Search for non-resonant Higgs boson pair production in the $2b+2\ell +E_{\mathrm{T}}^{\mathrm{miss}}$ final state in $pp$ collisions $\sqrt{s}=13\mathrm{TeV}$ with the ATLAS detector

Abstract

A search for non-resonant Higgs boson pair ($HH$) production is presented, in which one of the Higgs bosons decays to a b-quark pair ($b\bar{b}$) and the other decays to $W{W}^{\ast }$, $Z{Z}^{\ast }$, or ${\tau }^{+}{\tau }^{-}$, with in each case a final state with ${\ell }^{+}{\ell }^{-}+$ neutrinos ($\ell =e,\mu$). The analysis targets separately the gluon-gluon fusion and vector boson fusion production modes. Data recorded by the ATLAS detector in proton-proton collisions at a centre-of-mass energy of 13 TeV at the Large Hadron Collider, corresponding to an integrated luminosity of $140{\mathrm{fb}}^{-1}$, are used in this analysis. Events are selected to have exactly two $b$-tagged jets and two leptons with opposite electric charge and missing transverse momentum in the final state. These events are classified using multivariate analysis algorithms to separate the $HH$ events from other Standard Model processes. No evidence of the signal is found. The observed (expected) upper limit on the cross-section for non-resonant Higgs boson pair production is determined to be 9.7 (16.2) times the Standard Model prediction at 95% confidence level. The Higgs boson self-interaction coupling parameter ${\kappa }_{\lambda }$ and the quadrilinear coupling parameter ${\kappa }_{2V}$ are each separately constrained by this analysis to be within the ranges $[-6.2,13.3]$ and $[-0.17,2.4]$, respectively, at 95% confidence level, when all other parameters are fixed.

arXiv comment48 pages in total, author list starting page 31, 7 figures, 5 tables. All figures and tables including auxiliary figures and tables are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2019-02

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