Search for non-resonant Higgs boson pair production in the $bb\ell \nu \ell \nu$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV

Abstract

A search for non-resonant Higgs boson pair production, as predicted by the Standard Model, is presented, where one of the Higgs bosons decays via the $H\to bb$ channel and the other via one of the $H\to W{W}^{\ast }/Z{Z}^{\ast }/\tau \tau$ channels. The analysis selection requires events to have at least two $b$-tagged jets and exactly two leptons (electrons or muons) with opposite electric charge in the final state. Candidate events consistent with Higgs boson pair production are selected using a multi-class neural network discriminant. The analysis uses 139 fb${}^{-1}$ of $pp$ collision data recorded at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. An observed (expected) upper limit of 1.2 ($0.9_{-0.3}^{+0.4}$) pb is set on the non-resonant Higgs boson pair production cross-section at 95% confidence level, which is equivalent to 40 ($29_{-9}^{+14}$) times the value predicted in the Standard Model.

38 pages in total, author list starting page 22, 3 figures, 5 tables, published in Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-33

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