The role of sigma(e+e- -> hadrons) in precision tests of the Standard Model

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F. Jegerlehner This is my paper · ORCID

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keywords beencontributionsdevelopmentsdiscussedhadronsinterestingmanymodel

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I present a summary of recent developments as they have been discussed in the many interesting contributions to the workshop SIGHAD03 at Pisa.

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Perturbative QCD fitting of KEDR and BESIII $e^+e^-$ data for R(s) and $\alpha_s$ determination
hep-ph 2026-03 unverdicted novelty 5.0 of 10

Fits of combined KEDR and truncated BESIII data yield α_s(M_Z)=0.1179 (NLO), 0.1221 (NNLO), 0.1313 (N3LO), with the rise attributed to π² analytic-continuation effects.