Preliminary studies for the MUonE experimental proposal.
Bonanomi M. per la Collaborazione MUonE
I - Fisica nucleare e subnucleare
Aula 32B-1 - Venerdì 21 h 10:15 - 12:00
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We will show the results of the analysis performed on test-beam data collected at CERN in 2017 to measure the effects of the bremsstrahlung and multiple scattering on high-energy electrons colliding on low Z targets of various thickness and materials, for the muONe experiment. There are not data presently available in the literature for this precision. With the muONe experiment we propose a novel approach to determine the hadronic contribution to the anomalous magnetic moment g-2 with space-like data, by means of precise measurement of the hadronic shift of the effective electromagnetic coupling, by exploiting the elastic scattering of 150 GeV muons (currently available at CERN North area) on atomic electrons of low-Z segmented target. The measurement of the anomalous magnetic moment of the muon presently exhibits a 3.5 deviation between theory and experiments. In the next few years the anomalous magnetic moment will be measured to higher precisions at Fermilab and J-PARC. The theoretical prediction can be improved by reducing the uncertainty on the leading hadronic correction aHLO to the g-2. The direct measurement of aHLO in the space-like region will provide a new independent determination competitive with the time-like dispersive approach, and will consolidate the theoretical prediction of the muon g-2 in the Standard Model. It will allow therefore a firmer interpretation of the measurements of the future muon g-2 experiments at Fermilab and J-PARC.