Low energy hadronic contribution to the QED vacuum polarization

Details Low energy hadronic contribution to the QED vacuum polarization Low energy hadronic contribution to the QED vacuum polarization

2005-06-30

arxiv.org/abs/hep-ph/0506323v1

Phys.Rev. D72 (2005) 057501

Physics

High Energy Physics

High Energy Physics - Phenomenology

2 pages, 1 figure

Scientific paper

10.1103/PhysRevD.72.057501

Recent improvements in the low energy e+e- annihilation data and their
influence on the determination of the hadronic contribution to the running of
the QED fine structure constant at m_Z are discussed. Using CMD-2 and KLOE
measurements in the rho region we obtain Delta alpha(5)_had(s) = 0.02758 +/-
0.00035 at s = m_Z^2.

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