Tau-lepton Physics at the FCC-ee circular e${}^{+}$e${}^{-}$ Collider

Abstract

The future FCC-ee collider is designed to deliver ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ collisions to study with ultimate precision the Z, W, and Higgs bosons, and the top quark. In a high-statistics scan around the Z pole, $1.3\times 10^{11}$ events $\mathrm{Z}\to \tau \tau$ will be produced, the largest sample of $\tau \tau$ events foreseen at any lepton collider. With their large boost, $\tau$ leptons from Z decays are particularly well suited for precision measurements. The focus of this report is on tests of lepton universality from precision measurement of $\mathbf{\tau }$ properties and on tests of charged lepton flavour violation in Z decays and in $\tau$ decays. In both of these areas, FCC-ee promises sensitivities well beyond present experimental limits.

arXiv comment15 pages, 5 figures, 5 tables. Proceedings for the 15th International Workshop in Tau Lepton Physics. Update: fix reference

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