Exclusive hadronic cross sections from BaBar

Measuring the inclusive hadronic cross section in e+e- is of major interest for the determination of the Standard Model prediction of the anomalous magnetic moment of the muon aμ. The hadronic contribution aμhad can be derived from measured total cross sections of exclusive hadronic reactions with the help of a dispersion relation. Decreasing the experimental uncertainties on these channels is of utmost importance to improve the Standard Model prediction. The reaction channel e+ e- → π+ π- has the biggest impact on the calculation. This talk presents exclusive hadronic cross sections measured with the technique of Initial State Radiation (ISR). A huge dataset was taken with the BaBar detector at the B-factory PEP-II at SLAC (Stanford, USA), an electron-positron storage ring with fixed CM-energy of 10.58 GeV. Using the ISR method we get access to the energy range from the threshold up to 4.5 GeV. The first preliminary measurement of the ππ-channel and other channels important for the the muon anomaly will be presented, as well as the measurement of time-like baryonic form factors.