Muon g-2 theory: The hadronic part

I present a status report of the hadronic vacuum polarization effects for the muon g-2, to be considered as an update of [1]. The update concerns recent new inclusive R measurements from KEDR in the energy range 1.84 to 3.72 GeV. For the leading order contributions I find a(mu)(had(1)) = (688.07 +/- 4.14)[688.77 +/- 3.38] x10(-10) based on e(+)e(-) data [incl. tau data], 4a(mu)(had(2)) = (-9.93 +/- 0.07) x 10(-10) (NLO) and a(mu)(had(3)) = (1.22 +/- 0.01) x 10(-10) (NNLO). Collecting recent progress in the hadronic light-by-light scattering I adopt pi, eta, eta' [95 +/- 12] + axial-vector [8 +/- 3] + scalar [-6 +/- 1] + pi, K loops [-20 +/- 5] + quark loops [22 +/- 4] + tensor [1 +/- 0] + NLO [3 +/- 2] which yields a(mu)((6))(lbl, had) = (103 +/- 29) x 10(-11). With these updates I find a(mu)(exP) - a(mu)(the) = (31.3 +/- 7.7) x 10(-10) a 4.1 sigma deviation. Recent lattice QCD results and future prospects to improve hadronic contributions are discussed.