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Experimental input from $e^+e^-$ for $a_{\mu}$ light-by-light
by Y. P. Guo for BESIII Collaboration
Submission summary
| Authors (as registered SciPost users): | Yuping Guo |
| Submission information | |
|---|---|
| Preprint Link: | scipost_201811_00012v2 (pdf) |
| Date accepted: | May 2, 2019 |
| Date submitted: | Dec. 5, 2018, 1 a.m. |
| Submitted by: | Yuping Guo |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | The 15th International Workshop on Tau Lepton Physics (TAU2018) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
The anomalous magnetic momentum of the muon, $a_{\mu}$, has been measured and calculated with a precision up to $~0.5$ ppm, but there is a 3 to 4 standard deviations between these two values. The uncertainty in the calculation is dominated by the hadronic part, including the hadronic vacuum polarization and the hadronic light-by-light. The meson transition form factors and the helicity amplitudes can be used as input or constraint to the calculation of the hadronic light-by-light contribution. Latest experimental studies of the transition form factors of $\pi^0$, $\eta$, and $\eta^{*}$ and the cross-section of $\gamma\gamma^*\to\pi^+\pi-$from $e^+e^-$ collider are presented.
Published as SciPost Phys. Proc. 1, 054 (2019)