Speaker
Description
The measurement of the muon anomalous magnetic moment (g−2) exhibits a significant discrepancy with the Standard Model. The dominant theoretical uncertainty arises from the leading-order hadronic contribution a_µ^HLO, evaluated using data-driven approaches based on e+e− to hadron cross-section data, or recent lattice QCD results. However, tensions within these methods complicate the comparison between theory and experiment, underlining the importance of an independent validation. The MUonE experiment, conducted at CERN, aims to resolve this through an innovative method by measuring the running of the electromagnetic coupling constant , directly sensitive to a_µ^HLO, through muon-electron elastic scattering in the space-like region. This is achieved by directing a 160 GeV muon beam onto a low-Z target.
The phase 1 of MUonE, will deploy all key-components planned for the final experiment after the Long Shutdown 3, including high-precision silicon trackers, a spectrometer to measure the beam momentum, an electromagnetic calorimeter, a muon filter, and an advanced data acquisition system. The goals of this first run are to validate the full detector setup under operational conditions, optimize data acquisition and reconstruction techniques, perform comprehensive studies of systematic uncertainties and background processes. Additionally, Phase 1 will provide a direct measurement of the hadronic contribution to the running of alpha with ~20% statistical accuracy and similar systematics. The setup and the status of the experiment in preparation of the 2025 run will be presented.
