A feasibility test run for the MUonE project

The 3.4 σ discrepancy between the experimental value of the muon anomalous magnetic moment g-2 and the Standard Model prediction is one of the most intriguing indications of physics beyond the Standard Model. The MUonE project plans to measure the leading hadronic corrections to the muon g-2 by scattering high energy ( ∼ 150 GeV) muons off the atomic electrons of a low-Z target through the elastic process μ +e → μ +e. The angles of the incoming muons and the outcoming muons and electrons have to be measured precisely, to exploit the kinematical correlation of the μ -e collision. To reach this goal a modular target is foreseen, consisting of 60 low-Z (Be or C) elements, 1 cm thick, each sandwiched in layers of Si-microstrip detectors, organized in XY, XU and VY planes ( ± 45 °, to disentangle double tracks). In 2018, a feasibility test at the CERN North Area is foreseen, running parasitically on the beamline behind COMPASS. The setup consist of 16 layers with an area of 9.5 × 9.5 cm2, 410 μ m thick, single side AGILE silicon detectors, which have a readout pitch of 242 μ m and a floating strip scheme, resulting in a position resolution of the order of 40 μ m . The DAQ rate is of the order of a few kHz. The contribution will describe the setup, the DAQ system and the first data collected during the commissioning phase in April/May.