Direct measurement of αQED(mZ2) at the FCC-ee
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- Janot, P. J. High Energ. Phys. (2016) 2016: 53. doi:10.1007/JHEP02(2016)053
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When the measurements from the FCC-ee become available, an improved determination of the standard-model “input” parameters will be needed to fully exploit the new precision data towards either constraining or fitting the parameters of beyond-the-standard-model theories. Among these input parameters is the electromagnetic coupling constant estimated at the Z mass scale, αQED(mZ2). The measurement of the muon forwardbackward asymmetry at the FCC-ee, just below and just above the Z pole, can be used to make a direct determination of αQED(mZ2) with an accuracy deemed adequate for an optimal use of the FCC-ee precision data.