The hadronic vacuum polarization contribution to the muon (g-2) from below 1 GeV

por Gilberto Colangelo (Univ. Bern)

lunes 12 mar. 2007 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

The hadronic vacuum polarization contribution to the (g-2) is the source of the largest uncertainty in the Standard Model calculation. Its evaluation is based on data on $e^+ e^- \to$ hadrons (or $\tau$ hadronic decays). I will discuss a method to evaluate the dominant contribution of two pions below 1 GeV which relies on data, but uses also theoretical input, namely, chiral symmetry, analyticity and unitarity. It will be shown, in particular, that the bound on the inelastic contributions discussed by Eidelman and Lukaszuk plays an important role.