Hadronic vacuum polarization effects in alpha_em(M_Z)

2003/08/11 by F. Jegerlehner, Jegerlehner, F. · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0308117

16 pages, Latex, 3 figures, 2 tables

arxiv created 2003/08/11 · openalex publication_date 2003/08/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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

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