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Experimental input from $e^+e^-$ for $a_{\mu}$ light-by-light

by Y. P. Guo for BESIII Collaboration

Submission summary

As Contributors: Yuping Guo
Preprint link: scipost_201811_00012v2
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 (Amsterdam, 2018-09)
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.

Published as SciPost Phys. Proc. 1, 054 (2019)



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Resubmission scipost_201811_00012v2 on 5 December 2018

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