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Abstract
The KLOE-2 experiment represents the continuation of KLOE. It acquired 5.5 fb−1 data from November 2014 to March 2018 with the aim of collecting the largest sample of ϕ mesons at the DAΦNE e+e− collider at Frascati National Laboratory of INFN.A new tracking device, the Inner Tracker, was installed at the interaction region of KLOE-2 and it was operated together with the Drift Chamber to improve track and vertex reconstruction capabilities of the new experimental apparatus. The Inner Tracker is a four-layer cylindrical triple-GEM detector with each layer equipped with an X-V strips-pads stereo readout. Although GEM detectors have been extensively used in high energy physics experiments, the IT, with its fully-cylindrical geometry is a frontier detector and KLOE-2 is the first experiment which benefited of this novel detector technology operated at a collider.The operation of the Inner Tracker will be presented, together with the results of the alignment and calibration and tracking–vertexing performance of such a unique detector.
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