A search for Higgs boson pair production in the 𝑏𝑏𝛾𝛾 ̄ 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 = 13 TeV and 168 fb−1 at √𝑠 = 13.6 TeV, 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 +1.4 −1.1 (𝜇𝐻𝐻 = 1+1.3−1.0 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).

Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., et al. (2026). Study of Higgs boson pair production in the 𝐻𝐻 → 𝑏𝑏𝛾𝛾 final state with 308 fb−1 of data collected at √𝑠 = 13 TeV and 13.6 TeV by the ATLAS experiment. PHYSICS LETTERS. SECTION B, 876, 1-21 [10.1016/j.physletb.2026.140280].

Study of Higgs boson pair production in the 𝐻𝐻 → 𝑏𝑏𝛾𝛾 final state with 308 fb−1 of data collected at √𝑠 = 13 TeV and 13.6 TeV by the ATLAS experiment

Alberghi, G. L.;Alfonsi, F.;Ballabene, E.;Bellagamba, L.;Bianco, G.;Boscherini, D.;Bruni, A.;Carratta, G.;Cremonini, D.;De Castro, S.;Fabbri, F.;Fabbri, L.;Franchini, M.;Gabrielli, A.;Giacobbe, B.;Lasagni Manghi, F.;Levrini, G.;Nechaeva, S.;Polini, A.;Rinaldi, L.;Romano, M.;Sanzani, E.;Sbarra, C.;Sbrizzi, A.;Semprini-Cesari, N.;Sioli, M.;Todome, K.;Valentinetti, S.;Villa, M.;Vittori, C.;Vivarelli, I.;Zoccoli, A.;
2026

Abstract

A search for Higgs boson pair production in the 𝑏𝑏𝛾𝛾 ̄ 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 = 13 TeV and 168 fb−1 at √𝑠 = 13.6 TeV, 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 +1.4 −1.1 (𝜇𝐻𝐻 = 1+1.3−1.0 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).
2026
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., et al. (2026). Study of Higgs boson pair production in the ���� → �������� final state with 308 fb−1 of data collected at √�� = 13 TeV and 13.6 TeV by the ATLAS experiment. PHYSICS LETTERS. SECTION B, 876, 1-21 [10.1016/j.physletb.2026.140280].
Aad, G.; Aakvaag, E.; Abbott, B.; Abdelhameed, S.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboelela, M.; Aboulhorma, A.; Abramowicz, H.; Abulaiti, Y...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1086210
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