The MUonE experiment: Measuring the leading hadronic contribution to the Muon g-2 via $\mu e$ elastic scattering.

Pilato R.N. per la Collaborazione MUonE

I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala Ipogea - Giovedì 26 h 09:00 - 12:30
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The measurement of the muon g-2 presently exhibits a $\sim 3.5\sigma$ discrepancy from the Standard Model prediction and in the next years it will be measured at Fermilab and J-PARC with even higher precision. Therefore, it is extremely important to reduce the uncertainty on the theoretical prediction, dominated by the hadronic contribution $a_{\mu}^{HLO}$. We propose a novel approach to determine $a_{\mu}^{HLO}$ by measuring the running of the electromagnetic coupling constant in the space-like region, via $\mu e$ elastic scattering. The challenge of the MUonE experiment is to achieve a statistical uncertainty of 0.3% and a comparable systematic on the hadronic contribution. Such a measurement will allow an alternative determination of $a_{\mu}^{HLO}$ which is competitive with the present results obtained with the dispersive approach using time-like data.

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