Orateur
Giovanni Grilli di Cortona
(INFN - Laboratori Nazionali di Frascati)
Description
The 4.2𝜎 discrepancy between the theoretical prediction for the muon g-2 and the experimental results is accompanied by other anomalies. Determinations of the hadronic cross section from KLOE and BaBar, a crucial input for the data-driven prediction, disagree by almost 3 𝜎. Furthermore, the data-driven result disagrees with the most precise lattice determination by 2.1 𝜎. In this talk I will discuss how all these discrepancies could be accounted for by a new boson produced resonantly around the KLOE centre of mass energy and decaying promptly in 𝑒+ 𝑒− or 𝜇+ 𝜇− pairs.
