scholarly journals Recent progress in hadronic light-by-light scattering

2022 ◽  
Vol 258 ◽  
pp. 06004
Author(s):  
Martin Hoferichter

In recent years, significant progress in the calculation of the HLbL contribution to the anomalous magnetic moment of the muon has been achieved both with data-driven methods and in lattice QCD. In these proceedings I will discuss current developments aimed at controlling HLbL scattering at the level of 10%, as required for the final precision of the Fermilab E989 experiment.

2019 ◽  
Vol 218 ◽  
pp. 01001
Author(s):  
Andreas Nyffeler

We briefly review the current status of the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon. Based on various model calculations in the literature, we obtain the estimate $ \mathop a\nolimits_\mu ^{HLbL} = (102 \pm 39) \times \mathop {10}\nolimits^{ - 11} $. Recent developments including more model-independent approaches using dispersion relations and lattice QCD, that could lead to a more reliable estimate, are also discussed.


Author(s):  
Nils Asmussen ◽  
Antoine Gerardin ◽  
Andreas Nyffeler ◽  
Harvey B. Meyer

Hadronic light-by-light scattering in the anomalous magnetic moment of the muon a_\muaμ is one of two hadronic effects limiting the precision of the Standard Model prediction for this precision observable, and hence the new-physics discovery potential of direct experimental determinations of a_\muaμ. In this contribution, I report on recent progress in the calculation of this effect achieved both via dispersive and lattice QCD methods.


Author(s):  
M. Cè ◽  
A. Gérardin ◽  
G. von Hippel ◽  
B. Hörz ◽  
H. B. Meyer ◽  
...  

Author(s):  
M. Cè ◽  
A. Gérardin ◽  
G. von Hippel ◽  
B. Hörz ◽  
R. J. Hudspith ◽  
...  

2019 ◽  
Vol 218 ◽  
pp. 03001
Author(s):  
Bastian Kubis

We discuss status and prospects of a dispersive analysis of the π0, η, and η ′ transition form factors. Particular focus is put on the various pieces of experimental information that serve as input to such a calculation. These can help improve on the precision of an evaluation of the light pseudoscalar pole contributions to hadronic light-by-light scattering in the anomalous magnetic moment of the muon.**


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