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New Physics at Tera-$Z$: Precision Renormalised
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abstract
We study the power of a Tera-$Z$ run at FCC-ee for indirectly detecting or constraining heavy new physics. Our main finding is that nearly every new particle which matches at tree level to dimension-six operators of the Standard Model Effective Field Theory (SMEFT) affects electroweak precision observables (EWPOs) at either tree level or via one loop renormalisation group (RG) running. This is true almost regardless of the structure of couplings to the Standard Model; just a handful of exceptions are identified which can produce zeroes in the EWPO RG equations. Under simple flavour assumptions, we perform fits of each state to projected FCC-ee $Z$ pole measurements, showing that all scenarios can be tested at the TeV scale or better, with many projected exclusions reaching tens of TeV. Tera-$Z$ is argued to provide an almost inescapable probe of heavy new physics.
Forward citations
Cited by 4 Pith papers
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The Dark Side of a Tera-Z Factory
Future Tera-Z runs at FCC-ee/CEPC could indirectly probe TeV-scale t-channel dark matter portals through one-loop and two-loop electroweak precision shifts, and in leptophilic models would be the only planned experime...
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Descoped and Upscoped FCC-ee Running Scenarios in the SMEFT
A descoped FCC-ee retains most of its SMEFT reach if a reduced-luminosity top-quark run is kept, while upscoped luminosity increases barely improve the global fit.
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Search for new physics effects in $\nu\bar{\nu}\gamma$ production at a Tera-Z factory
A cut-based analysis of e+e−→ννγ at a Tera-Z factory is projected to constrain BR(Z→ννγ) to about 2×10^-9 (3σ, no systematics), an order-3 improvement over LEP but above the SM value 7.2×10^-10.
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Cornering Natural SUSY at a Tera-$Z$ Factory
FCC-ee's Tera-Z electroweak precision program could probe natural supersymmetric particles up to multi-TeV masses, sometimes better than Higgs coupling measurements, assuming Standard Model theory uncertainties can be...
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