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.
First Direct Measurement of the Parity-Violating Coupling of the Z^0 to the s-Quark
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abstract
We have made the first direct measurement of the parity-violating coupling of the Z^0 boson to the strange quark, A_s, using ~550,000 e^+e^- ->Z^0->hadrons events produced with a polarized electron beam and recorded by the SLD experiment. Z^0 -> s-sbar events were tagged by the absence of B or D hadrons and the presence in each hemisphere of a high-momentum K^+- or K^0_s. From the polar angle distributions of the strangeness-signed thrust axis, we obtained A_s=0.895+-0.066(stat.)+-0.062(syst.). The analyzing power and u-ubar plus d-dbar background were constrained using the data.
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Probing New Physics with the Electron Yukawa coupling
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.