KLOE-2

The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati (LNF) is currently taking data at the upgraded $e^{+}e^{-}$ DAFNE collider. Present Run II follows a development phase to assess the feasibility of a long term acquisition program, Run I, which successfully ended in July 2015 with 1 fb$^{-1}$ integrated luminosity collected in less than eight months. For the first time the "crab-waist" concept – an interaction scheme, developed in Frascati, where the transverse dimensions of the beams and their crossing angle are tuned to maximize the machine luminosity – has been applied in presence of a high-field detector solenoid. Record performance in terms of 2 x 10$^{32}$ cm$^{-2}$s$^{-1}$ peak luminosity and 12 pb$^{-1}$ maximum daily integrated luminosity were achieved with this innovative scheme of beam collisions, which will be employed in the upgrade of the $B$-factory currently under construction at the KEK Laboratory, in Japan, and is also considered a valid option in several future projects.

KLOE-2 represents the continuation of KLOE with a new physics program mainly focused on the study of $K_s$, $\eta$ and $\eta′$ decays as well as on kaon interferometry, test of discrete symmetries, and search for physics beyond the Standard Model. The new data taking campaign aiming to collect more than 5 fb$^{-1}$ integrated luminosity in the next 2-3 years, will allow to perform CPT symmetry and quantum coherence tests using entangled neutral kaons with an unprecedented precision, high precision studies of $\gamma\gamma$-physics processes like $e^{+}e^{-}\to e^{+}e^{-} \pi^0 (\gamma\gamma \to \pi^0)$, and the search for signals of a hidden dark-matter sector, among the fields to be addressed. The general purpose KLOE detector, composed by one of the biggest Drift Chamber ever built surrounded by a lead-scintillating fiber Electromagnetic Calorimeter among the best ones for energy and timing performance at low energies, undergone several upgrades including State-of-The-art cylindrical GEM detector: the Inner Tracker. To improve its vertex reconstruction capabilities near the interaction region, KLOE-2 is the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea that was developed at LNF exploiting the kapton properties to build a transparent and compact tracking system. To study $\gamma\gamma$-physics the detector has been upgraded with two pairs of electron-positron taggers: the Low Energy Tagger (LET), inside the KLOE apparatus, and the High Energy Tagger (HET) along the beam lines outside the KLOE detector. An overview of the KLOE-2 experiment will be given including present status and achievements together with physics plans.