16.05.2022 / 13:00 / Zeuthen, Online

Lattice seminar

Lattice QCD calculation of the hadronic light-by-light contribution to the magnetic moment of the muon

Prof. Harvey Meyer (Johannes Gutenberg-Universität Mainz)

I present a recent calculation of the hadronic light-by-light scattering contribution to the muon g−2 directly using lattice QCD. I first describe the methodology based on coordinate-space methods and a pilot calculation at the SU(3)-flavour symmetric point with a pseudoscalar mass of about 420 MeV. The final result at physical quark masses, zero lattice spacing and infinite volume has a competitive precision and is well in line with one previous lattice calculation as well as with previous determinations based on either hadronic models or dispersive methods. Our result strengthens the conclusion that the hadronic light-by-light contribution cannot by itself explain the current tension between theory and experiment for the muon (g-2).

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