Measurement of the Running of the Fine-Structure Constant

Abstract

Bhabha scattering data recorded at \sqrt{s}=189 GeV by the L3 detector at LEP are used to measure the running of the effective fine-structure constant for spacelike momentum transfers. The results are alpha^-1(-2.1 GeV^2) - alpha^-1(-6.25 GeV^2) = 0.78 +/- 0.26 alpha^-1(-12.25 GeV^2) - alpha^-1(-3434 GeV^2) = 3.80 +/- 1.29, in agreement with theoretical predictions.

References in corpus (13)

• Hadronic contributions to $(g-2)$ of the leptons and to the effective fine structure constant $\alpha (M_Z^2)$
• BHWIDE 1.00: O(alpha) YFS Exponentiated Monte Carlo for Bhabha Scattering at Wide Angles for LEP1/SLC and LEP2
• Leptonic contribution to the effective electromagnetic coupling constant up to three loops
• Improved Determination of alpha_QED(M_Z^2) and the Anomalous Magnetic Moment of the Muon
• Improved Determination of $\alpha (M_{\mathrm{Z}}^2$) and the Anomalous Magnetic Moment of the Muon
• A theory driven analysis of the effective QED coupling at $M_Z$
• Calculation of the QED Coupling alpha (M_Z) in the Modified Minimal-Subtraction Scheme
• Testing non-perturbative strong interaction effects via the Adler function
• A determination of the QED coupling at the $Z$ pole
• Reevaluation of the Hadronic Contribution to $\alpha (M_Z^2)$ (revised)
• Reevaluation of the Hadronic Contribution to $\alpha (M_Z^2)$
• Improved Determination of the Hadronic Contribution to the Muon (g-2) and to alpha(M_Z**2) Using new Data from Hadronic Tau Decays
• New Results on the Theoretical Precision of the LEP/SLC Luminosity

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