Abstract:The discrepancy between the FOPT and CIPT approaches for hadronic
\tauτ
spectral function moments constitutes the major theoretical uncertainty
for strong coupling determinations from tau decay data. We show the
discrepancy can be analytically understood since the Borel
representations – which have been assumed to be identical for both
approaches previously – differ in the presence of IR renormalons. This
implies that the OPE condensate corrections are different for both
approaches and that the discrepancy may… Show more
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