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Searches for Long-Lived Particles at the Future FCC-ee

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arxiv 2203.05502 v4 pith:V4YRP4X4 submitted 2022-03-10 hep-ex hep-phhep-th

J. Alimena , P. Azzi , M. Bauer , A. Blondel , M. Drewes , R. Gonzalez Suarez , J. Klaric , S. Kulkarni
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O. Mikulenko M. Neubert M. Ovchynnikov C. Rizzi R. Ruiz L. Rygaard A. Sfyrla T. Sharma A. Thamm C. B. Verhaaren
This is my paper · ORCID
classification hep-exhep-phhep-th
keywords fcc-eehiggsphysicssearchesbosonslong-livedparticlescircular
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The electron-positron stage of the Future Circular Collider, FCC-ee, is a frontier factory for Higgs, top, electroweak, and flavour physics. It is designed to operate in a 100 km circular tunnel built at CERN, and will serve as the first step towards $\geq$ 100 TeV proton-proton collisions. In addition to an essential and unique Higgs program, it offers powerful opportunities to discover direct or indirect evidence of physics beyond the Standard Model. Direct searches for long-lived particles at FCC-ee could be particularly fertile in the high-luminosity $Z$ run, where $5\times 10^{12}$ $Z$ bosons are anticipated to be produced for the configuration with two interaction points. The high statistics of Higgs bosons, $W$ bosons and top quarks in very clean experimental conditions could offer additional opportunities at other collision energies. Three physics cases producing long-lived signatures at FCC-ee are highlighted and studied in this paper: heavy neutral leptons (HNLs), axion-like particles (ALPs), and exotic decays of the Higgs boson. These searches motivate out-of-the-box optimization of experimental conditions and analysis techniques, that could lead to improvements in other physics searches.

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Cited by 2 Pith papers

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

  1. Prospects for probing light photophobic axion-like particles via displaced vertex signals at the CEPC

    hep-ph 2026-03 conditional novelty 6.0 of 10

    At the CEPC Z-pole (91.2 GeV, 100 ab^-1), displaced-vertex searches for photophobic ALPs via Z→aγ could probe g_aWW from about 10^-3 to 0.68 TeV^-1 for m_a=1-9 GeV.

  2. Neutrinoless double beta decay rates and the $3 + 2$ scenario

    hep-ph 2025-05 conditional novelty 2.0 of 10

    A proceedings review of the author's prior EFT calculation of neutrinoless double beta decay and of a two-sterile-neutrino model, containing no new derivation.

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