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Future Circular Lepton Collider FCC-ee: Overview and Status
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The worldwide High Energy Physics community widely agrees that the next collider should be a Higgs factory. Acknowledging this priority, in 2021 CERN has launched the international Future Circular Collider (FCC) Feasibility Study (FS). The FCC Integrated Project foresees, in a first stage, a high-luminosity high-energy electron-positron collider, serving as Higgs, top and electroweak factory, and, in a second stage, an energy frontier hadron collider, with a centre-of-mass energy of at least 100 TeV. In this paper, we address a few key elements of the FCC-ee accelerator design, its performance reach, and underlying technologies, as requested by the Snowmass process. The Conceptual Design Report for the FCC, published in 2019, serves as our primary reference. We also summarize a few recent changes and improvements.
Forward citations
Cited by 11 Pith papers
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Investigating vector-like leptons decaying into an electron and missing transverse energy in e$^{+}$ e$^{-}$ collisions with $\sqrt{s} = 500$ GeV at the ILC
Simulated ILC data at 500 GeV with 1000 fb^-1 would exclude vector-like leptons up to about 100-180 GeV for small mass splittings, and across the whole studied range for a 100 GeV splitting, at a Yukawa coupling of 0.1.
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Charged Higgs Search at Future Neutrino Telescope and Higgs Factory
Future lepton colliders can discover a charged Higgs below about half their energy, while multi-cubic-kilometer neutrino telescopes add complementary reach for heavier charged Higgs masses.
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The effects of a scalar singlet Leptoquark at the $Z$ factory
A scalar singlet leptoquark that explains B-meson anomalies produces a ~0.7% decrease in Z→τ+τ−, which future Z-factory measurements could detect, while Z→μ+μ− is essentially unchanged.
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Deep-learning jet flavor tagging for precision hadronic Higgs measurements at future $e^+e^-$ Higgs factories
The two-stage deep-learning tagger pipeline projects CEPC statistical precisions of 0.18% (bb), 1.07% (cc), 0.52% (gg) and 78% (ss) for sigma(ZH)xBr(H->X) at 20 ab^-1, improving cc/gg benchmarks by ~42%/26%.
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Double heavy quarkonia production with color-octet channels at Z factory and at the CEPC/FCC-ee
Color-octet channels are predicted to dominate many double heavy quarkonium production processes at future Z factories, with relativistic corrections suppressing charmonium rates by roughly a factor of two.
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Heavy Neutral Leptons without Prejudice
HL-LHC and FCC-ee can probe HNL Yukawa couplings down to y^2 near 10^-4 to 10^-6 depending on mass; at zero mixing, Higgs width precision is the strongest constraint and the two colliders have comparable reach.
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Searching for vector-like leptons decaying into an electron and missing transverse energy in e$^{+}$e$^{-}$ collisions with $\sqrt{s} = 240$ GeV at the FCC-ee
Monte Carlo projections for FCC-ee at 240 GeV set 95% CL exclusion limits on vector-like lepton mass and Yukawa coupling in a lepton-portal scalar dark-matter scenario if no signal appears.
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Searching for the Leptophilic Gauge Boson Z$_{l}$ at Future $e^{+}e^{-}$ Colliders
A parton-level projection shows FCC-ee and CEPC can discover a leptophilic Z' down to g_l about 10^-4, while ILC and CLIC extend the search to TeV-scale masses.
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Gamma-Rays and Gravitational Waves from Inelastic Higgs Portal Dark Matter
An inelastic complex-scalar Higgs portal dark matter model can evade direct detection, explain the Galactic Center gamma-ray excess, and produce a first-order electroweak phase transition with a gravitational wave sig...
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Optimal sensitivity of anomalous charged triple gauge couplings through $W$ boson helicity at the $e^+e^-$ colliders
SMEFT sensitivities to anomalous WWV couplings at a 3 TeV e+e- collider are improved by 1 to 2 orders of magnitude over LHC limits when using optimal observables and W helicity selection.
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Mass and Decay Properties of Toponium Using SUSY QM Factorization Method
SUSY QM factorization of the Cornell potential yields toponium 1S masses 344.114 and 344.141 GeV, a 2.57 MeV gg width, and radii of 0.015–0.025 fm.
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