Results and perspectives on hadron physics at KLOE/KLOE-2

Abstract

The KLOE-2 data-taking at the + − DAΦNE collider in Frascati has been completed by achieving an integrated luminosity of more than 5 fb −1 at the peak. KLOE-2 is an updated version of the KLOE experiment with new detectors and an extended physics program, including light mesons investigations at unprecedented statistics. The KLOE/KLOE-2 data sample corresponds to more than 3 × 10 8 eta-meson events. The huge available statistics has been used to search for the P, CP violating → + − , obtaining the most stringent upper limit for this decay by using 1.7 fb −1 of KLOE data. The status of the → 0 decay will be reported and also the progress on the investigation on the B boson, a postulated leptophobic mediator of dark forces, which uses the same five photon final state. Among the aims of the KLOE-2 experiment there is the study of the reaction + − → + − → + − by tagging the final state of the leptons. Data stability studies, based on very low angle Bhabha cross section measurement, and updates on → 0 analysis will be presented.