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Abstract
A search for the resonant production of a heavy scalar X decaying into a Higgs
boson and a new lighter scalar S, through the process X → S(→b¯b)H(→γγ), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using an integrated luminosity of 140 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The search is performed over the mass range 170 ≤ mX ≤ 1000 GeV and 15 ≤ mS ≤ 500 GeV. Parameterised neural networks are used to enhance the signal purity and to achieve continuous sensitivity in a domain of the (mX , mS ) plane. No significant excess above the expected background is found and 95% CL upper limits are set on the cross section times branching ratio, ranging from 39 fb to 0.09 fb. The largest deviation from the background-only expectation occurs for (mX , mS ) = (575, 200) GeV with a local (global) significance of 3.5 (2.0) standard deviations.
boson and a new lighter scalar S, through the process X → S(→b¯b)H(→γγ), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using an integrated luminosity of 140 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The search is performed over the mass range 170 ≤ mX ≤ 1000 GeV and 15 ≤ mS ≤ 500 GeV. Parameterised neural networks are used to enhance the signal purity and to achieve continuous sensitivity in a domain of the (mX , mS ) plane. No significant excess above the expected background is found and 95% CL upper limits are set on the cross section times branching ratio, ranging from 39 fb to 0.09 fb. The largest deviation from the background-only expectation occurs for (mX , mS ) = (575, 200) GeV with a local (global) significance of 3.5 (2.0) standard deviations.
Original language | English |
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Article number | 047 |
Pages (from-to) | 1-46 |
Number of pages | 46 |
Journal | Journal of High Energy Physics |
Volume | 2024 |
Issue number | 11 |
DOIs | |
Publication status | Published - 7 Nov 2024 |
Keywords / Materials (for Non-textual outputs)
- Hadron-Hadron Scattering
- Beyond Standard Model
- Higgs Physics
- Hadron-Hadron scattering
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Dive into the research topics of 'Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons in proton–proton collisions at √s = 13 TeV with the ATLAS detector'. Together they form a unique fingerprint.-
Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/27
Project: Research
-
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/26
Project: Research
-
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 31/03/26
Project: Research