Tera-Zooming in on light (composite) axion-like particles

Abstract

The Tera-Z phase of future $e^{+}{e}^{-}$ colliders, FCC-ee and CepC, is a goldmine for exploring $Z$ portal physics. We focus on axion-like particles (ALPs) that can be produced via $Z$ decays with a monochromatic photon. As a template model, we consider composite Higgs models with a light pseudo-scalar that couples through the Wess-Zumino-Witten term to the electroweak gauge bosons. For both photophilic and photophobic cases, we show that the Tera-Z can probe composite scales up to $100$s of TeV, well beyond the capability of the LHC and current precision physics. Our results also apply to generic ALPs and, in particular, severely constrain models that explain the muon $g-2$ anomaly.

6 pages, 3 Figures

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Cited by in corpus (7)

• Searches for Long-Lived Particles at the Future FCC-ee
• Prospects for detecting axion-like particles via the decay $Z\to af\bar{f}$ at future $Z$ factories
• Exploring extended Higgs sectors via pair production at the LHC
• The ALP explanation to muon $(g-2)$ and its test at future Tera-$Z$ and Higgs factories
• Exploring Axion-Like Particle Couplings through Single Top $tW$-Channel and Top Pair Production at the LHC
• A comprehensive study of ALPs from $B$-decays
• Sifting composite from elementary models at FCCee and CePC