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New Physics Through Flavor Tagging at FCC-ee

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arxiv 2411.02485 v2 pith:MKDP2GXN submitted 2024-11-04 hep-ph hep-ex

Admir Greljo , Hector Tiblom , Alessandro Valenti This is my paper · ORCID
classification hep-phhep-ex
keywords fcc-eeflavoranalysiscurrentflavorsinteractionsquarktagging
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Leveraging recent advancements in machine learning-based flavor tagging, we develop an optimal analysis for measuring the hadronic cross-section ratios $R_b$, $R_c$, and $R_s$ at the FCC-ee during its $WW$, $Zh$, and $t\bar{t}$ runs. Our results indicate up to a two-order-of-magnitude improvement in precision, providing an unprecedented test of the SM. Using these observables, along with $R_\ell$ and $R_t$, we project sensitivity to flavor non-universal four-fermion (4F) interactions within the SMEFT, contributing both at the tree level and through the renormalization group (RG). We highlight a subtle complementarity with RG-induced effects at the FCC-ee's $Z$-pole. Our analysis demonstrates significant improvements over the current LEP-II and LHC bounds in probing flavor-conserving 4F operators involving heavy quark flavors and all lepton flavors. As an application, we explore simplified models addressing current $B$-meson anomalies, demonstrating that FCC-ee can effectively probe the relevant parameter space. Finally, we design optimized search strategies for quark flavor-violating 4F interactions.

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Cited by 10 Pith papers

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  1. The Dark Side of a Tera-Z Factory

    hep-ph 2025-07 conditional novelty 7.0 of 10

    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...

  2. In Search of an Invisible $Z^\prime$

    hep-ph 2024-12 conditional novelty 7.0 of 10

    Anomaly cancellation forces every Z-pole-invisible, anomaly-free Z' to couple to valence quarks and at least two charged lepton flavours, ensuring LHC coverage.

  3. Electroweak precision observables at NLL order in the SMEFT

    hep-ph 2026-08 accept novelty 6.0 of 10

    SMEFT electroweak precision predictions can be upgraded to NLL accuracy using two-loop renormalization-group evolution plus one-loop matching, yielding complete 210-coefficient expressions and stronger indirect new-ph...

  4. Could electron-top interactions spoil the measurement of the Higgs trilinear? -A quantitative estimate at future lepton colliders-

    hep-ph 2025-12 conditional novelty 6.0 of 10

    Electron-top four-fermion operators are constrained by FCC-ee fermion-pair measurements strongly enough that they do not spoil the ~17% one-sigma extraction of the Higgs trilinear coupling.

  5. Probing New Physics with the Electron Yukawa coupling

    hep-ph 2025-01 conditional novelty 6.0 of 10

    Simplified models that can chirally enhance the electron Yukawa coupling are classified, and their reach at FCC-ee and via (g-2)_e is quantified, showing (g-2)_e is often competitive but not always.

  6. Toponium: the smallest bound state and simplest hadron in quantum mechanics

    hep-ph 2024-12 conditional novelty 6.0 of 10

    Using the b-quark production ratio at sqrt(s) near 341 GeV, a simulated CEPC experiment could discover toponium at over 5 sigma and measure the top 1S mass to about 33 MeV.

  7. Constraints on the malaphoric $B_3-L_2$ model from di-lepton resonance searches at the LHC

    hep-ph 2024-12 accept novelty 6.0 of 10

    New bounds from ATLAS 13 TeV di-lepton searches force the malaphoric B3-L2 Z' to exceed 2.8 TeV to preserve its b to s l+ l- fit, and the HL-LHC is expected to reach 4.2 TeV.

  8. Counting b-jets at the FCC-ee as a probe of top-quark flavor physics

    hep-ph 2026-07 accept novelty 5.5 of 10

    FCC-ee at 240 GeV can probe Λ_eff ∼ 7–13 TeV for scalar, vector and tensor eetu/eetc operators by counting b_P-odd single-b-jet multi-jet events.

  9. Accuracy complements energy: electroweak precision tests at Tera-Z

    hep-ph 2024-12 conditional novelty 5.0 of 10

    Z-pole precision at a Tera-Z factory gives projected sensitivities to Higgs and gauge SMEFT operators that are competitive with, and complementary to, higher-energy runs such as WW and ZH.

  10. Cornering Natural SUSY at a Tera-$Z$ Factory

    hep-ph 2025-07 conditional novelty 4.0 of 10

    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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