Theory of the Hadronic Light-by-Light Contribution to Muon g-2

TL;DR

This paper reviews the theoretical understanding and recent calculations of the hadronic light-by-light contribution to muon g-2, providing an updated estimate of its value based on collaborative work.

Contribution

It presents a new combined theoretical estimate of the hadronic light-by-light contribution to muon g-2, updating previous calculations with recent advances.

Findings

a^{HLbL} = (10.5 +- 2.6) x 10^{-10}

Updated theoretical estimate of the hadronic light-by-light contribution

Summary of recent progress in the field

Abstract

I report on the theory, recent calculations and present status of the hadronic light-by-light contribution to muon g-2. In particular, I report on work done together with Eduardo de Rafael and Arkady Vainshtein where we get a^{HLbL} = (10.5 +- 2.6) x 10^{-10} as our present result for this quantity.