Speaker
Description
Electron-positron collisions at the leptonic mode of the Future Circular Collider (FCC-ee) will offer an unprecedented opportunity to study electroweak interactions with extreme precision through measurements at the $Z$ pole. In this context, forward–backward asymmetries of charm, strange, and bottom quarks constitute powerful observables for probing the vector and axial-vector nature of couplings of the $Z$ boson to fermions at its extremes. Owing to the enormous $Z$ boson statistics expected, these asymmetries can be measured with orders-of-magnitude improvement over previous experiments. We discuss the prospects for determining the forward–backward asymmetries of $c$, $s$, and $b$ quarks, emphasizing the dependence of their precision on flavor tagging and charge reconstruction techniques tailored to FCC-ee conditions, and on control of systematic uncertainties. Precise measurements of these observables enable stringent tests of the Standard Model, improved determinations of the effective weak mixing angle, and enhanced sensitivity to physics beyond the Standard Model through deviations in electroweak couplings. In particular, the strange-quark asymmetry, historically limited by experimental challenges, becomes accessible with competitive precision. These measurements at the FCC-ee will play a central role in a global electroweak fit, providing complementary constraints to other precision observables and significantly extending the legacy of LEP, SLC and LHC.
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