Evaluating the Use of Muon g-2 Calorimeter Crystals in MUonE

MUonE is a proposed experiment at CERN that will measure the hadronic component of the running of the muon's electromagnetic coupling with energy scale, which could play an important role in understanding the hadronic contribution to the muon's anomalous magnetic moment. Previous experimental results for the muon's magnetic moment have had a significant discrepancy from data-driven Standard Model predictions, but the theoretical situation has become confused by new lattice calculations. The MUonE experiment may reuse lead fluoride crystals from the calorimeters of the Muon g-2 experiment at Fermilab, which measured the muon's anomalous magnetic moment. When high-energy particles pass through these crystals, they emit small amounts of light through Cherenkov radiation, which is detected by Silicon Photomultipliers. This presentation will show data from a test beam experiment at CERN where the crystals were tested with electron beam energies up to 100 GeV, which is significantly higher than the 3.1 GeV used at Fermilab, and comparable to the scale needed by MUonE.