Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-09-07
PoS LAT2005 (2005) 353
Physics
High Energy Physics
High Energy Physics - Lattice
6 pages, 1 figure, Talk presented at Lattice 2005 (weak matrix elements), Dublin, July 25-30, 2005, one reference added, text
Scientific paper
The hadronic light-by-light scattering contribution to the muon g-2 is the most troublesome component of its theoretical prediction; (1) it cannot be determined from the other measurable quantities, (2) the dimensional argument and the estimation based on hadronic models imply that the magnitude of this contribution may be comparable to the discrepancy between the standard model prediction and the experimental value. The direct approach to evaluate the hadronic light-by-light scattering contribution requires the evaluation of the correlation function of {\it four} hadronic electromagnetic currents, and the summation of it over two independent four-momenta of off-shell photons, which is far from the reach of direct lattice simulation. Here we propose an alternative method using combined (QCD + QED) lattice simulations to evaluate the hadronic light-by-light scattering contribution.
Blum Thomas
Hayakawa Masashi
Izubuchi Taku
Yamada Norikazu
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