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Quark flavor violation and axion-like particles from top-quark decays at the LHC

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arxiv 2404.06126 v2 pith:RYH7LIU5 submitted 2024-04-09 hep-ph hep-ex

Kingman Cheung , Fei-Tung Chung , Giovanna Cottin , Zeren Simon Wang This is my paper · ORCID
classification hep-phhep-ex
keywords alpscouplingsaxion-likedecaysjetslong-livedparticlesquarks
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We study axion-like particles (ALPs) with quark-flavor-violating couplings at the LHC. Specifically, we focus on the theoretical scenario with ALP-top-up and ALP-top-charm interactions, in addition to the more common quark-flavor-diagonal couplings. The ALPs can thus originate from decays of top quarks which are pair produced in large numbers at the LHC, and then decay to jets. If these couplings to the quarks are tiny and the ALPs have $\mathcal{O}(10)$ GeV masses, they are long-lived, leading to signatures of displaced vertex plus multiple jets, which have the advantage of suppression of background events at the LHC. We recast a recent ATLAS search for the same signature and reinterpret the results in terms of bounds on the long-lived ALP in our theoretical scenario. We find that the LHC with the full Run 2 dataset can place stringent limits, while at the future high-luminosity LHC with 3 ab$^{-1}$ integrated luminosity stronger sensitivities are expected.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Heavy neutral leptons and top quarks in effective field theory

    hep-ph 2025-01 conditional novelty 6.0 of 10

    Long-lived heavy neutral leptons produced via top-quark effective operators could be probed at the HL-LHC up to new-physics scales around 12 TeV at ATLAS and 4.5 TeV at MATHUSLA or ANUBIS.

  2. Reheating the FCC: Probing Early Matter Domination with Long-Lived Particles

    hep-ph 2026-07 conditional novelty 5.0 of 10

    FCC-hh displaced-vertex searches could probe Higgs-portal scalars whose decays ended an early matter-dominated era at temperatures from ~1 GeV to the electroweak scale.

  3. Long-lived sterile neutrinos from axionlike particles at the Super Tau-Charm Facility

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

    STCF can reach |V_eN|^2 values one to two orders of magnitude below current bounds for heavy neutral leptons via displaced-vertex searches from ALP decays in D-meson production.

  4. Axions and Axion-like particles: collider searches

    hep-ph 2025-08 accept

    A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.

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