Running α (QED) Lab

Live μ slider with lepton thresholds, massless-e comparison, α(MZ) and Landau-pole readout.

About this tool

Running α (QED) Lab — drag the renormalization scale μ. Compare one-loop massless-electron running with a schematic stepped e/μ/τ threshold matching. Markers at m_e, m_μ, m_τ, M_Z. Educational; not a precision QED calculation.