• experiment
• g-2
• muon
• hadronic contribution
• muone
• running
• anomaly
• alpha

The muon magnetic anomaly aμ is one of the most precisely measured quantities in high energy physics and it constitutes a stringent test of the theory.
Recently, the E989 experiment at Fermilab National Laboratory has published an important result from their first set of data which, combined with the previous Brookhaven measurement, enhances the discrepancy with the Standard Model to 4.2σ.
The dominant uncertainty in the theoretical prediction is the hadronic contribution to the vacuum polarization. The MUonE experiment has been recently proposed, with the aim to measure aμHLO with a completely innovative method based on the determination of the hadronic contribution to the running of the electromagnetic coupling constant (∆αhad) in the space-like region, by means of μ+e−→μ+e− elastic scattering using the 150GeV CERN muon beam. A statistical uncertainty of ∼0.3% on aμHLO can be reached in 3 years of data taking.
After introducing the aμ prediction and the experimental measurements in Chapter 1, Chapter 2 describes the MUonE proposal submitted to CERN. I then report, in Chapters 3 to 5, my contribution to the preparation of the 2022 Test Run with a setup corresponding to ~10% of the complete detector. In particular, I worked on the construction of the first prototype and on a study of the electron single hit resolution. Finally, a study of the systematic uncertainty due to longitudinal alignment on aμHLO is discussed.