Thursday, March 28, 2019, 16:00
WHGA Auditorium
Graziano Venanzoni, INFN Pisa
Abstract:
The precision measurement of the anomalous magnetic moment of the muon
presently exhibits a 3.5 sigma discrepancy with the Standard Model (SM)
prediction. In the next few years this measurement will reach an even
higher precision at Fermilab and J-PARC. While the QED and electroweak
contributions to the muon g-2 can be determined very precisely, the
leading hadronic (HLO) correction is affected by a large uncertainty
which dominates the error of the SM prediction. A novel approach has
been proposed to determine the HLO contribution to the muon g-2 based on
the measurement of the effective electromagnetic coupling in the
space-like region at low-momentum transfer. We will discuss the
possibility of performing this measurement at CERN by the MUonE
experiment, which is part of the CERN PBC Study Group and aims at a very
precise determination of the muon-electron elastic differential
cross-section, exploiting the scattering of 150 GeV muons (currently
available at CERN's North area) on atomic electrons of a low-Z target.
Such a new and independent determination of the leading hadronic
corrections to the muon g-2 will allow a more stringent test of the
Standard Model when compared with the g-2 measurements expected at
Fermilab and J-PARC. I will review the status of this proposal.