Preprint

PUBDB-2025-02554

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A search for dark matter produced in association with a dark Higgs boson decaying into a Higgs boson pair in 3$b$ or 4$b$ final states using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS Collaboration (Collaboration author)DESY*

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-02554

Report No.: CERN-EP-2025-141; arXiv:2507.02175

Abstract: A search is performed for dark matter particles produced in association with a resonant pair of Higgs bosons using 140 fb$^{-1}$ of proton--proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. This signature is expected in some extensions of the Standard Model predicting the production of dark matter particles, and is interpreted in terms of a dark Higgs model containing a $Z'$ mediator in which the dark Higgs boson $s$ decays into a pair of Higgs bosons. The dark Higgs boson is reconstructed through final states with at least three $b$-tagged jets, produced by the pair of Higgs boson decays, in events with significant missing transverse momentum consistent with the presence of dark matter. The observed data are found to be in good agreement with Standard Model predictions, constraining scenarios with dark Higgs boson masses within the range of 250 to 400 GeV and $Z'$ mediators up to 2.3 TeV.

Note: All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HMBS-2024-13

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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)469666862 - Präzisionstests des Standardmodells unter der Verwendung von geboosteten W/Z-Bosonen am Large Hadron Collider (469666862) (469666862)
3. BARD - B-resonance Algorithm using Rare Decays (101116429) (101116429)
4. DITTO - Comprehensive search for new phenomena in the dilepton spectrum at the LHC (101089007) (101089007)
5. REALDARK - REAL-time discovery strategies for DARK matter and dark sector signals at the ATLAS detector with Run-3 LHC data (101002463) (101002463)
6. SMASH - Machine learning for Sciences and Humanities (101081355) (101081355)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2025

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