New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911566265319424 |
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| author | Drewes, Marco Klarić, Juraj Li, Yuan-Zhen |
| author_facet | Drewes, Marco Klarić, Juraj Li, Yuan-Zhen |
| contents | Several proposed future lepton colliders are capable of producing trillions of Z-bosons, including FCC-ee, CEPC, LEP3 and LEP-Z. Such Tera-Z factories can discover new elementary particles with couplings to the Z-boson that are orders of magnitude smaller than current bounds. For couplings near the currently excluded parameter regions they could produce sufficiently large samples to study the new particles' properties in detail, hence acting as a discovery and precision machine in one. Using simple analytic estimates, we quantify the dependence of the expected event yield in long-lived particle searches on the number of produced Z-bosons and on the detector dimensions. From this, we derive estimates for both the discovery reach and the measurement precision attainable at such facilities. While the precision of such estimates of course falls short of proper simulations, the analytic approach is suitable for a quick assessment of the sensitivity for a given design. We illustrate this with two examples, heavy neutral leptons and axion-like particles. Under optimistic assumptions, these could be produced in the millions and billions, respectively, effectively turning future lepton colliders into exotics factories.
We provide a code that quickly generates the sensitivity curves displayed in this work and can be extended to other models at https://github.com/liyuanzhen98/LLPatTeraZ. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_23461 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines Drewes, Marco Klarić, Juraj Li, Yuan-Zhen High Energy Physics - Phenomenology High Energy Physics - Experiment Several proposed future lepton colliders are capable of producing trillions of Z-bosons, including FCC-ee, CEPC, LEP3 and LEP-Z. Such Tera-Z factories can discover new elementary particles with couplings to the Z-boson that are orders of magnitude smaller than current bounds. For couplings near the currently excluded parameter regions they could produce sufficiently large samples to study the new particles' properties in detail, hence acting as a discovery and precision machine in one. Using simple analytic estimates, we quantify the dependence of the expected event yield in long-lived particle searches on the number of produced Z-bosons and on the detector dimensions. From this, we derive estimates for both the discovery reach and the measurement precision attainable at such facilities. While the precision of such estimates of course falls short of proper simulations, the analytic approach is suitable for a quick assessment of the sensitivity for a given design. We illustrate this with two examples, heavy neutral leptons and axion-like particles. Under optimistic assumptions, these could be produced in the millions and billions, respectively, effectively turning future lepton colliders into exotics factories. We provide a code that quickly generates the sensitivity curves displayed in this work and can be extended to other models at https://github.com/liyuanzhen98/LLPatTeraZ. |
| title | New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2511.23461 |