Heavy new physics four-fermion operators can bias small-angle Bhabha luminosity calibration at future e+e- colliders at the level of the design precision, and luminosity-independent Bhabha asymmetries can constrain the operators and remove the bias.
First Measurement of Leptonic Coupling Asymmetries with Polarized Z bosons
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abstract
We present direct measurements of the $Z^0$-lepton coupling asymmetry parameters, $A_e$, $A_\mu$, and $A_\tau$, based on a data sample of 12,063 leptonic $Z^0$ decays collected by the SLD detector. The $Z$ bosons are produced in collisions of beams of polarized $e^-$ with unpolarized $e^+$ at the SLAC Linear Collider. The couplings are extracted from the measurement of the left-right and forward-backward asymmetries for each lepton species. The results are: $A_e=0.152 \pm 0.012 {(stat)} \pm 0.001 {(syst)}$, $A_\mu=0.102 \pm 0.034 \pm 0.002$, and $A_\tau=0.195 \pm 0.034 \pm 0.003$.
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New Physics contamination to precision luminosity measurements at future $e^+e^-$ colliders
Heavy new physics four-fermion operators can bias small-angle Bhabha luminosity calibration at future e+e- colliders at the level of the design precision, and luminosity-independent Bhabha asymmetries can constrain the operators and remove the bias.