Event Reconstruction in MUonE Experiment at the SPS Accelerator

The MUonE experiment planned to be operating at the SPS accelerator in 2021–2022 (pilot run) and 2023–2026 provides a great potential to search for new physics in the sector of the anomalous muon magnetic moment aμ. The discrepancy between the most accurate determination of aμ and the Standard Model predictions is about 4 standard deviations. Since the new experiments dedicated to highly precise measurements of the anomalous magnetic moment of the muon will allow for the measurement with an accuracy of about 0.05%, a serious limitation in increasing the significance of a possible discovery will be the theoretical error, dominated by uncertainties from hadronic contributions. The MUonE experiment will allow for a precise measurement of hadronic contribution to aμ employing the measurement of the differential cross section for the μe → μe elastic process. This would help to increase the significance of the observed discrepancy to the level of 7 standard deviations. The crucial issue in this kind of study is the development of the event reconstruction procedures, allowing to control the systematic effects and, at the same time, to achieve high angular resolution.