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Studies of new Higgs boson interactions through nonresonant HH production in the $$ b\overline{b}\gamma \gamma $$ final state in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

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Aad, G 
Abbott, B 
Abeling, K 
Abicht, NJ 
Abidi, SH 


jats:titleAjats:scbstract</jats:sc> </jats:title>jats:pA search for nonresonant Higgs boson pair production in the jats:inline-formulajats:alternativesjats:tex-math$$ b\overline{b}\gamma \gamma $$</jats:tex-math><mml:math xmlns:mml=""> mml:mib</mml:mi> mml:mover mml:mib</mml:mi> mml:mo¯</mml:mo> </mml:mover> mml:miγγ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> final state is performed using 140 fbjats:supjats:italic−</jats:italic>1</jats:sup> of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. This analysis supersedes and expands upon the previous nonresonant ATLAS results in this final state based on the same data sample. The analysis strategy is optimised to probe anomalous values not only of the Higgs (jats:italicH</jats:italic>) boson self-coupling modifier jats:italicκ</jats:italic>jats:subjats:italicλ</jats:italic></jats:sub> but also of the quartic jats:italicHHVV</jats:italic> (jats:italicV</jats:italic> = jats:italicW</jats:italic>, jats:italicZ</jats:italic>) coupling modifier jats:italicκ</jats:italic>jats:sub2jats:italicV</jats:italic></jats:sub>. No significant excess above the expected background from Standard Model processes is observed. An observed upper limit jats:italicμ</jats:italic>jats:subjats:italicHH</jats:italic></jats:sub> < 4.0 is set at 95% confidence level on the Higgs boson pair production cross-section normalised to its Standard Model prediction. The 95% confidence intervals for the coupling modifiers are jats:italic−</jats:italic>1.4 < jats:italicκ</jats:italic>jats:subjats:italicλ</jats:italic></jats:sub> < 6.9 and −0.5 < jats:italicκ</jats:italic>jats:sub2jats:italicV</jats:italic></jats:sub> < 2.7, assuming all other Higgs boson couplings except the one under study are fixed to the Standard Model predictions. The results are interpreted in the Standard Model effective field theory and Higgs effective field theory frameworks in terms of constraints on the couplings of anomalous Higgs boson (self-)interactions.</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, ICSC-NextGenerationEU 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 (U.K.) and BNL (U.S.A.), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in ref. [105].


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

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