TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.1.054
TI  - Experimental input from $e^+e^-$ for $a_{\mu}$ light-by-light
PY  - 2019/05/09
UR  - https://scipost.org/SciPostPhysProc.1.054
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 1
SP  - 054
A1  - Guo, Yuping
AB  - 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.
ER  -

@Article{10.21468/SciPostPhysProc.1.054,
	title={{Experimental input from $e^+e^-$ for $a_{\mu}$ light-by-light}},
	author={Yuping Guo on behalf of BESIII Collaboration},
	journal={SciPost Phys. Proc.},
	pages={054},
	year={2019},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.1.054},
	url={https://scipost.org/10.21468/SciPostPhysProc.1.054},
}