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 √<i>s</i>=13 TeV with the ATLAS detector


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Aad G., Aakvaag E., Abbott B., Abeling K., Abicht N., Abidi S., ...More

JOURNAL OF HIGH ENERGY PHYSICS, vol.2024, no.11, 2024 (SCI-Expanded, Scopus) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 2024 Issue: 11
  • Publication Date: 2024
  • Doi Number: 10.1007/jhep11(2024)047
  • Journal Name: JOURNAL OF HIGH ENERGY PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, INSPEC, zbMATH, Directory of Open Access Journals, Nature Index
  • Keywords: Beyond Standard Model, Hadron-Hadron Scattering, Hadron-Hadron scattering, Higgs Physics
  • Open Archive Collection: AVESIS Open Access Collection
  • Ankara University Affiliated: Yes

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) over bar )H(->gamma gamma), 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 <= m(X) <= 1000 GeV and 15 <= m(S) <= 500 GeV. Parameterised neural networks are used to enhance the signal purity and to achieve continuous sensitivity in a domain of the (m(X), m(S)) 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 (m(X), m(S)) = (575, 200) GeV with a local (global) significance of 3.5 (2.0) standard deviations.