Gamma–gamma tagging system for KLOE2 experiment

The gamma–gamma physics is a relevant part of the physics programme of KLOE2 project at DA Φ NE . In particular, there is a strong interest to measure the cross-section for the process γ γ → π 0 π 0 in the low energy region for its relevance in the context of the assessing the existence and nature of the sigma meson. In this talk we present the tagging system for the final leptons which we are developing. We will illustrate the characteristics and performance required for the detectors and the acquisition system. In particular, this system should be able to acquire data for each bunch crossing and therefore to a frequency of 368 MHz.