Hadronic vacuum polarization effects in alphaem(MZ)
Abstract
Recent evaluations of the hadronic vacuum polarization contributions to the effective fine-structure constant alphaem(MZ) are summarized and commented. A new update based on corrected CMD-2 data is presented. My new estimates are Delta alphahad(5)(MZ) = 0.027773 +/- 0.000354 (e+e- - data based) and Delta alphahad(5)(MZ) = 0.027664 +/- 0.000173 (via the Adler-function and extended use of pQCD). Prospects of further possible progress is discussed.
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