The evolution of the electromagnetic coupling, $\alpha$, in the momentum-transfer range 1800 GeV$^2 < -Q^2 <$ 21600 GeV$^2$ is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies $\sqrt{s}=$ 189-209 GeV. The running of $\alpha$ is parametrised as: $\alpha(Q^2) = \frac{\alpha_0}{1-C\Delta\alpha(Q^2)}$, where $\alpha_0 \equiv \alpha(Q^2=0)$ is the fine-structure constant and C=1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e$^+$e$^- \to$ e$^+$e$^-$ process for scattering angles in the range $\vert\cos \theta\vert <0.9$ excludes the hypothesis of a constant value of $\alpha$, C=0, and validates the QED prediction with the result: $C=...
Small-angle Bhabha scattering data recorded at the Z resonance and large-angle Bhabha scattering dat...
Small-angle Bhabha scattering data recorded at the Z resonance and large-angleBhabha scattering data...
We present a study of the structure of hadronic events recorded by the L3 detector at LEP at the cen...
The evolution of the electromagnetic coupling, $\alpha$, in the momentum-transfer range 1800 GeV$^2 ...
The evolution of the electromagnetic coupling, alpha, in the momentum-transfer range 1800 GeV2 \u3c ...
AbstractThe evolution of the electromagnetic coupling, α, in the momentum-transfer range 1800 GeV2<−...
Using the OPAL detector at LEP, the running of the effective QED coupling alpha(t) is measured for s...
Using the OPAL detector at LEP, the running of the effective QED coupling alpha(t) is measured for s...
The results on strong coupling constant, alpha(s), in e(+)e(-) collision at LEP are reviewed, based ...
Small-angle Bhabha scattering data recorded at the Z resonance and large-angle Bhabha scattering dat...
Small-angle Bhabha scattering data recorded at the Z resonance and large-angleBhabha scattering data...
We present a study of the structure of hadronic events recorded by the L3 detector at LEP at the cen...
The evolution of the electromagnetic coupling, $\alpha$, in the momentum-transfer range 1800 GeV$^2 ...
The evolution of the electromagnetic coupling, alpha, in the momentum-transfer range 1800 GeV2 \u3c ...
AbstractThe evolution of the electromagnetic coupling, α, in the momentum-transfer range 1800 GeV2<−...
Using the OPAL detector at LEP, the running of the effective QED coupling alpha(t) is measured for s...
Using the OPAL detector at LEP, the running of the effective QED coupling alpha(t) is measured for s...
The results on strong coupling constant, alpha(s), in e(+)e(-) collision at LEP are reviewed, based ...
Small-angle Bhabha scattering data recorded at the Z resonance and large-angle Bhabha scattering dat...
Small-angle Bhabha scattering data recorded at the Z resonance and large-angleBhabha scattering data...
We present a study of the structure of hadronic events recorded by the L3 detector at LEP at the cen...