Results on conventional and exotic charmonium at BABAR

The B factories provide a unique playground for studying the properties of conventional and exotic charmonium states. We present recent results in initial state radiation and two-photon fusion, obtained using the full data set collected by the BABAR experiment. Amongst BABAR ’s harvest presented in this talk, the determination of the quantum numbers of the X(3915) resonance, a body of concording evidence pointing to JPC = 1++ for the X(3872), and updates on the family of the Y resonance to the full integrated luminosity. In this talk I have presented recent results obtained by the BaBar experiment on char-monium and charmonium-like resonances, using production mechanisms that select the quantum numbers. Angular momentum conservation, and for strong decays parity con-servation and charge conjugation invariance then imply that these quantum numbers also apply to the final state. In the case of two-photon fusion, charge conjugation is positive, and for non-tagged events, for which the initial electron and positron are unobserved, the event selection performed during the analysis is such that the two intermediate photons are quasi-real: allowed JPC are 0±+, 2±+, 4±+ · · · and 3++, 5++ · · ·. In the case of initial state radiation (ISR), for which a photon is emitted by either of the incoming leptons, JPC = 1−−. Results presented here are related to understanding the nature and the properties o