SciPost Submission Page
Experimental input from $e^+e^-$ for $a_{\mu}$ light-by-light
by Y. P. Guo for BESIII Collaboration
This Submission thread is now published as
Submission summary
| Submission information |
| Preprint Link: |
scipost_201811_00012v2
(pdf)
|
| Date accepted: |
2019-05-02 |
| Date submitted: |
2018-12-05 01:00 |
| Submitted by: |
Guo, Yuping |
| Submitted to: |
SciPost Physics Proceedings |
| Proceedings issue: |
The 15th International Workshop on Tau Lepton Physics (TAU2018) |
| Ontological classification |
| Academic field: |
Physics |
| Specialties: |
- High-Energy Physics - Experiment
- Quantum Physics
|
| 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.
