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Search for Higgs boson pair production in association with a vector boson in pp collisions at √s=13TeV with the ATLAS detector

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jats:titleAbstract</jats:title>jats:pThis paper reports a search for Higgs boson pair (jats:italichh</jats:italic>) production in association with a vector boson (jats:inline-formulajats:alternativesjats:tex-math$$W; {\text {o}r}; Z$$</jats:tex-math><mml:math xmlns:mml=""> mml:mrow mml:miW</mml:mi> <mml:mspace /> mml:mrow mml:mtexto</mml:mtext> mml:mir</mml:mi> </mml:mrow> <mml:mspace /> mml:miZ</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>) using 139 fbjats:inline-formulajats:alternativesjats:tex-math$$^{-1}$$</jats:tex-math><mml:math xmlns:mml=""> mml:msup <mml:mrow /> mml:mrow mml:mo-</mml:mo> mml:mn1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> of proton–proton collision data at jats:inline-formulajats:alternativesjats:tex-math$$\sqrt{s}=13,\text {TeV}$$</jats:tex-math><mml:math xmlns:mml=""> mml:mrow mml:msqrt mml:mis</mml:mi> </mml:msqrt> mml:mo=</mml:mo> mml:mn13</mml:mn> <mml:mspace /> mml:mtextTeV</mml:mtext> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> recorded with the ATLAS detector at the Large Hadron Collider. The search is performed in final states in which the vector boson decays leptonically (jats:inline-formulajats:alternativesjats:tex-math$$W\rightarrow \ell \nu ,, Z\rightarrow \ell \ell ,\nu \nu $$</jats:tex-math><mml:math xmlns:mml=""> mml:mrow mml:miW</mml:mi> mml:mo→</mml:mo> mml:miℓ</mml:mi> mml:miν</mml:mi> mml:mo,</mml:mo> <mml:mspace /> mml:miZ</mml:mi> mml:mo→</mml:mo> mml:miℓ</mml:mi> mml:miℓ</mml:mi> mml:mo,</mml:mo> mml:miν</mml:mi> mml:miν</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> with jats:inline-formulajats:alternativesjats:tex-math$$\ell =e, \mu $$</jats:tex-math><mml:math xmlns:mml=""> mml:mrow mml:miℓ</mml:mi> mml:mo=</mml:mo> mml:mie</mml:mi> mml:mo,</mml:mo> mml:miμ</mml:mi> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>) and the Higgs bosons each decay into a pair of jats:italicb</jats:italic>-quarks. It targets jats:italicVhh</jats:italic> signals from both non-resonant jats:italichh</jats:italic> production, present in the Standard Model (SM), and resonant jats:italichh</jats:italic> production, as predicted in some SM extensions. A 95% confidence-level upper limit of 183 (87) times the SM cross-section is observed (expected) for non-resonant jats:italicVhh</jats:italic> production when assuming the kinematics are as expected in the SM. Constraints are also placed on Higgs boson coupling modifiers. For the resonant search, upper limits on the production cross-sections are derived for two specific models: one is the production of a vector boson along with a neutral heavy scalar resonance jats:italicH</jats:italic>, in the mass range 260–1000 GeV, that decays into jats:italichh</jats:italic>, and the other is the production of a heavier neutral pseudoscalar resonance jats:italicA</jats:italic> that decays into a jats:italicZ</jats:italic> boson and jats:italicH</jats:italic> boson, where the jats:italicA</jats:italic> boson mass is 360–800 GeV and the jats:italicH</jats:italic> boson mass is 260–400 GeV. Constraints are also derived in the parameter space of two-Higgs-doublet models.</jats:p>


Acknowledgements: We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRI, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DSI/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TENMAK, Türkiye; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; COST, ERC, ERDF, Horizon 2020 and Marie Skłodowska-Curie Actions, European Union; Investissements d’Avenir Labex, Investissements d’Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and MINERVA, Israel; Norwegian Financial Mechanism 2014–2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Göran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. [116].


5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences

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European Physical Journal C

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