Abstract
A key motivation for the two-photon physics program of the BESIII collaboration is the need of high precision data on electromagnetic transition form factors as input to the calculations of the contribution of hadronic Light-by-light scattering to the anomalous magnetic moment of the muon. The data collected with the BESIII detector allow to study the momentum dependence of the form factors at small momentum transfers, which is of special relevance for αμ. In this presentation the ongoing measurements of the transition form factors of π0,η and η' mesons, as well as pion pairs, are discussed, and the potential for first double-tagged measurements at BESIII are pointed out.
Highlights
The production and investigation of hadrons at electron-positron colliders mostly relies on the annihilation of the beam particles
A key motivation for the two-photon physics program of the BESIII collaboration is the need of high precision data on electromagnetic transition form factors as input to the calculations of the contribution of hadronic Light-by-light scattering to the anomalous magnetic moment of the muon
The data collected with the BESIII detector allow to study the momentum dependence of the form factors at small momentum transfers, which is of special relevance for aμ
Summary
The production and investigation of hadrons at electron-positron colliders mostly relies on the annihilation of the beam particles. Γγ physics provides access to structural information of the produced hadronic states This presentation focuses on the measurement of the TFF of light mesons at the BESIII experiment, which is motivated by the ongoing efforts in theory and experiment to determine the anomalous magnetic moment of the muon, aμ. Various laboratories world wide have measured σ(e+e− → hadrons) in scan experiments and exploiting the technique of Initial State Radiation (ISR) These results can be used to significantly reduce the uncertainty of aμ related to hadronic vacuum polarization in the near future. In order to reduce the model dependency of the prediction of ahμLbL, data driven approaches are being developed Their goal is to provide a more reliable estimate of the uncertainty of ahμLbL by describing the dominating processes based on dispersive analyses [11, 12] and experimental information. The BESIII experiment can contribute in the region of low momentum transfer and can provide data on the TFF dependence with high statistical accuracy
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