0000000000177589
AUTHOR
Yuping Guo
showing 2 related works from this author
Space-like transition form factors from BESIII
2018
Abstract The anomalous magnetic momentum of muon, a μ , has been measured in experiment and calculated in theory with a precision up to ∼0.5 ppm. But there is a long standing 3 to 4 standard deviations between these two accurate values. The dominant contribution to the uncertainty in the theoretical calculation comes from the hadroninc contribution, including contributions from the hadronic vacuum polarization and the hadronic light-by-light. The meson transition form factors measured in two photon process at BESIII can be used as input or constrain for the calculation of the hadronic light-by-light contribution to a μ . Recent experimental activities, including the measurements of the tran…
Experimental input from $e^+e^-$ for $a_{\mu}$ light-by-light
2019
The anomalous magnetic momentum of the muon, a_{\mu}aμ, has been measured and calculated with a precision up to ~0.50.5 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}π0, \etaη, and \eta^{\prime}η′ and the cross-section of \gamma\gamma^*\to\pi^+\pi^-γγ*→π+π− from e^{+}e^{-}e+e− collider are prese…