Abstract

We discuss some highlights of the FCC-ee flavor physics program. It will help to explore various aspects of flavor physics: to test precision calculations, to probe nonperturbative QCD methods, and to increase the sensitivity to physics beyond the standard model. In some areas, FCC-ee will do much better than current and near-future experiments. We briefly discuss several probes that can be relevant for maximizing the gain from the FCC-ee flavor program.

Highlights

  • The goal of the FCC-ee program in its tera-Z phase is to produce about 5 × 1012 Z decays, which will greatly improve precision electroweak tests of the standard model (SM)

  • Collecting 108 W W pairs would yield a qualitatively new determination of |Vcb| from W → bcdecays, with 0.3–0.4% uncertainty [3,4]. Such a determination will be independent of |Vcb| measurements in B decays. (The statistical uncertainty of extracting |Vub| from W → buis estimated around 5% [4], and would need to improve to be competitive with anticipated prior results.) collecting 1.5 ab−1 data near the ttthreshold yields a clean sample of 106 ttevents [1]

  • There is a lot of effort at the LHC and Belle II to test the CKM picture of C P violation (CPV) to much higher precision. The drive for this program is the fact that some observables are theoretically extremely clean, and any experimental progress will improve the sensitivity to beyond standard model (BSM) physics

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Summary

Introduction

The goal of the FCC-ee program in its tera-Z phase is to produce about 5 × 1012 Z decays (per experiment), which will greatly improve precision electroweak tests of the standard model (SM) These decays will yield about 1012 bband ccpairs, as well as a large and clean sample of τ +τ − pairs. Using these data, the FCC-ee can shed light on open issues in flavor physics. This eliminates a systematic uncertainty at the LHC experiments, which may become important for some C P asymmetry measurements as their sensitivities approach the per mille level Another important difference between the FCC-ee compared to both Belle II and the LHC is that quarks from Z decays are highly polarized. These large values make studies that require polarization ideal for the FCC-ee

Specific probes
C P violation in hadronic b decays
Very rare decays
Polarized baryons and quarks
Exclusive hadronic Z decays
Charm physics
Conclusions
CEPC Study Group
Belle-II
HFLAV Collaboration
Full Text
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