A search for the resonant production of a heavy scalar 𝑋 decaying into a lighter scalar 𝑆 and a Higgs boson, through the process 𝑋 → 𝑆(→ 𝑏̄ 𝑏)𝐻(→ 𝛾𝛾), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using integrated luminosities of 140 and 59 fb−1 of proton–proton collision data at centre-of-mass energies of 13 and 13.6 TeV, respectively, recorded with the ATLAS detector at the LHC. The search is performed over the mass ranges of 170 ≤ 𝑚𝑋 ≤ 1000 GeV and 15 ≤ 𝑚𝑆 ≤ 500 GeV. No significant excess over the Standard Model background predictions is observed and limits at 95% confidence level are set on the product of cross section and branching fraction for the process 𝑋 → 𝑆(→ 𝑏̄ 𝑏)𝐻(→ 𝛾𝛾) at 13 TeV, ranging from 9 fb to 0.06 fb.

Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., et al. (2026). Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb−1 of data collected at √ 𝑠=13 and 13.6 TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 877, 1-19 [10.1016/j.physletb.2026.140425].

Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb−1 of data collected at √ 𝑠=13 and 13.6 TeV with the ATLAS detector

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 the resonant production of a heavy scalar 𝑋 decaying into a lighter scalar 𝑆 and a Higgs boson, through the process 𝑋 → 𝑆(→ 𝑏̄ 𝑏)𝐻(→ 𝛾𝛾), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using integrated luminosities of 140 and 59 fb−1 of proton–proton collision data at centre-of-mass energies of 13 and 13.6 TeV, respectively, recorded with the ATLAS detector at the LHC. The search is performed over the mass ranges of 170 ≤ 𝑚𝑋 ≤ 1000 GeV and 15 ≤ 𝑚𝑆 ≤ 500 GeV. No significant excess over the Standard Model background predictions is observed and limits at 95% confidence level are set on the product of cross section and branching fraction for the process 𝑋 → 𝑆(→ 𝑏̄ 𝑏)𝐻(→ 𝛾𝛾) at 13 TeV, ranging from 9 fb to 0.06 fb.
2026
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., et al. (2026). Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb−1 of data collected at √ ��=13 and 13.6 TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 877, 1-19 [10.1016/j.physletb.2026.140425].
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/11585/1088557
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