Search for charged long-lived particles at the Future Circular Collider (FCC-ee)

Abstract

Long-lived particles (LLPs) have emerged as a compelling signature of physics beyond the standard model, offering unique discovery opportunities at current and future colliders. We present an analysis of charged LLPs leading to signatures with kinked tracks and displaced vertices. Using timing information the search is extended to detector-stable LLPs. We explore the discovery prospects of such particles at the Future Circular Collider~(FCC-ee), a proposed e⁺e⁻ collider. The clean collision environment of FCC-ee and excellent tracking performance of the IDEA detector enhance the sensitivity to kinked-track signatures, which are considerably more challenging to reconstruct in the high-occupancy environment of hadron colliders. The excellent timing resolution of the timing layer enables us to infer the mass of the detector stable particles. As a benchmark the stau pair production in the gauge mediated supersymmetry breaking (GMSB) within the minimal supersymmetric standard model scenario is considered. In this model the lightest supersymmetric particle is a gravitino and the next-to-lightest supersymmetric particle is the stau, the superpartner of the tau lepton. Discovery sensitivity up to the kinematic limit is obtained for the ZH and tt̅ runs of the planned FCC-ee operation. We demonstrate that a potential discovery would allow for a precise τ̃ mass measurement.

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Cite

BibTeX RIS

BibTeX

@misc{vashishtha2026search,
  title = {{Search for charged long-lived particles at the Future Circular Collider (FCC-ee)}},
  author = {Soumyaa Vashishtha and Mirindra Randriamanantena and Thomas Creuset and Maximilian Goblirsch-Kolb and Isabell Melzer-Pellmann},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2605.23793},
  eprint = {2605.23793},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.23793},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Search for charged long-lived particles at the Future Circular Collider (FCC-ee)
AU  - Soumyaa Vashishtha
AU  - Mirindra Randriamanantena
AU  - Thomas Creuset
AU  - Maximilian Goblirsch-Kolb
AU  - Isabell Melzer-Pellmann
PY  - 2026
DA  - 2026/10/15
PB  - arXiv
DO  - 10.48550/arxiv.2605.23793
UR  - https://arxiv.org/abs/2605.23793
AB  - Long-lived particles (LLPs) have emerged as a compelling signature of physics beyond the standard model, offering unique discovery opportunities at current and future colliders. We present an analysis of charged LLPs leading to signatures with kinked tracks and displaced vertices. Using timing information the search is extended to detector-stable LLPs. We explore the discovery prospects of such particles at the Future Circular Collider~(FCC-ee), a proposed e^+e^− collider. The clean collision environment of FCC-ee and excellent tracking performance of the IDEA detector enhance the sensitivity to kinked-track signatures, which are considerably more challenging to reconstruct in the high-occupancy environment of hadron colliders. The excellent timing resolution of the timing layer enables us to infer the mass of the detector stable particles. As a benchmark the stau pair production in the gauge mediated supersymmetry breaking (GMSB) within the minimal supersymmetric standard model scenario is considered. In this model the lightest supersymmetric particle is a gravitino and the next-to-lightest supersymmetric particle is the stau, the superpartner of the tau lepton. Discovery sensitivity up to the kinematic limit is obtained for the ZH and tt̅ runs of the planned FCC-ee operation. We demonstrate that a potential discovery would allow for a precise τ̃ mass measurement.
ER  -

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