Hadronic ligh-by-light contribution to the anomalous magnetic moment of the muon: The role of scalar resonances in a holographic model of QCD

Luigi Cappiello, G.E. Bruno, G. Chiodini, P. Colangelo, C. Corianò, D.M. Creanza, F. De Fazio, E. Nappi
2022 EPJ Web of Conferences  
We review the evaluation of scalar mesons contribution to the hadronic light-by-light piece of the muon anomalous magnetic moment, using a holographic model of QCD.We evaluate the contributions of the lightest, sub-GeV scalars σ(500), a0(980) and f0(980) and their associated towers of excited states. Our results point at a negative contribution, overwhelmingly dominated by the σ(500) meson, that we estimate at aμHLbL,S = -9(2)·10-11, in very good agreement with recent determinations from dispersive analyses.
doi:10.1051/epjconf/202227000029 fatcat:ihivxyq2nncvzogzpz4zpcbcfa