Titolo: The new muon g-2 puzzle


Speaker:  Prof. Paride Paradisi (Dip. di Fisica, Univ. di Padova e INFN - Padova)


Abstract: The recent measurement of the muon g-2 at Fermilab confirms the previous Brookhaven result. The leading hadronic vacuum polarization (HVP) contribution to the muon g-2 represents a crucial ingredient to establish whether the Standard Model prediction differs from the experimental value. A recent lattice QCD result by the BMW collaboration shows a tension with the low-energy e+e- --> hadrons data which are currently used to determine the HVP contribution. We refer to this tension as the new muon g-2 puzzle.

In this colloquium, we analyse whether new physics contributions can be invoked to solve the new muon g-2 puzzle.