A search for Higgs boson pair production in the bb¯γγ final state is performed. The proton–proton collision dataset corresponds to an integrated luminosity of 308 fb−1, consisting of two samples, 140 fb−1 at a centre-of-mass energy of s=13TeV and 168 fb−1 at s=13.6TeV, recorded between 2015 and 2024 by the ATLAS detector at the CERN Large Hadron Collider. In addition to a larger dataset, this analysis improves upon the previous search in the same final state through several methodological and technical developments. The Higgs boson pair production cross section divided by the Standard Model prediction is found to be μHH=0.9−1.1+1.4 (μHH=1−1.0+1.3 expected), which translates into a 95% confidence-level upper limit of μHH ' 3.7. At the same confidence level the Higgs self-coupling modifier is constrained to be in the range −1.6'κλ'6.6 (−1.8'κλ'6.9 expected).

Study of Higgs boson pair production in the $HH\rightarrow b\bar{b} \gamma\gamma$ final state with 308 fb$^-1$ of data collected at $\sqrt{s} = $13 TeV and 13.6 TeV by the ATLAS experiment / G. Aad, E.A.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 876:(2026 May), pp. 140280.1-140280.21. [10.1016/j.physletb.2026.140280]

Study of Higgs boson pair production in the $HH\rightarrow b\bar{b} \gamma\gamma$ final state with 308 fb$^-1$ of data collected at $\sqrt{s} = $13 TeV and 13.6 TeV by the ATLAS experiment

A. Andreazza;A. Carbone;L. Carminati;B. Cervato;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;C. Meroni;L. Nasella;F. Ragusa;A. Sala;R. Zanzottera;
2026

Abstract

A search for Higgs boson pair production in the bb¯γγ final state is performed. The proton–proton collision dataset corresponds to an integrated luminosity of 308 fb−1, consisting of two samples, 140 fb−1 at a centre-of-mass energy of s=13TeV and 168 fb−1 at s=13.6TeV, recorded between 2015 and 2024 by the ATLAS detector at the CERN Large Hadron Collider. In addition to a larger dataset, this analysis improves upon the previous search in the same final state through several methodological and technical developments. The Higgs boson pair production cross section divided by the Standard Model prediction is found to be μHH=0.9−1.1+1.4 (μHH=1−1.0+1.3 expected), which translates into a 95% confidence-level upper limit of μHH ' 3.7. At the same confidence level the Higgs self-coupling modifier is constrained to be in the range −1.6'κλ'6.6 (−1.8'κλ'6.9 expected).
ATLAS; B-jets; Di-Higgs; Photons; Run 3; Self-interaction;
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Settore IMIS-01/B - Misure elettriche ed elettroniche
   REAL-time discovery strategies for DARK matter and dark sector signals at the ATLAS detector with Run-3 LHC data
   REALDARK
   European Commission
   Horizon 2020 Framework Programme - European Research Council - Consolidator Grant
   101002463

   B-resonance Algorithm using Rare Decays
   BARD
   European Commission
   Horizon Europe Framework Programme - European Research Council - HORIZON ERC Grants
   101116429

   Turning noise into data: a discovery strategy for new weakly-interacting physics
   DISCOVERHEP
   European Commission
   Horizon 2020 Framework Programme - European Research Council - Starting Grant
   948254

   Comprehensive search for new phenomena in the dilepton spectrum at the LHC
   DITTO
   European Commission
   Horizon Europe Framework Programme - European Research Council - HORIZON ERC Grants
   101089007

   Machine learning for Sciences and Humanities
   SMASH
   European Commission
   Horizon Europe Framework Programme - HORIZON TMA MSCA Cofund Postdoctoral programme
   101081355
mag-2026
17-apr-2026
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1249864
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