Muon g-2: a showdown?
The muon anomalous magnetic moment (the muon “g-2”) is one of the best determined observables in nature. Its measurement at Brookhaven (USA) in the early 2000s, which reached the astonishing experimental precision of 0.5 parts per million, shows an intriguing discrepancy with the similarly precise theoretical prediction of the “Standard Model”, the theory that describes all known particles and their interactions through electromagnetic, weak, and strong forces. This is, at present, a discrepancy of 3.7 standard deviations. Wednesday April 7th, the “Muon g-2” collaboration at Fermilab (USA) will present their highly anticipated new measurement of the muon anomalous magnetic moment. If Fermilab confirms Brookhaven’s measurement, this could be clear evidence of “new physics” beyond the Standard Model.
As an introducion to the Fermilab announcement INFN Padova and the Dipartiment of Physics and Astronomy of Padova University will hold a Zoom seminar on
wednesday April 7th, from 14.30 to 16.00
Speakers: Massimo Passera, Stefano Laporta, Pierpaolo Mastrolia, Paride Paradisi
Zoom link https://unipd.zoom.us/j/89508138799?pwd=UkppN3dGOXZPZEJ4UUF6MFFxVS9ldz09
In anticipation of Fermilab’s result, Massimo will review the present status of the muon g-2 SM prediction (and why we should trust it), Stefano will tell us how he managed to compute the electron and muon g-2 at four-loop in QED, and Pierpaolo will review the theory progress for MUonE, a recent proposal for a new experiment at CERN to provide a new direct determination of the leading hadronic contribution to the muon g-2. Finally, Paride will review new physics interpretations of the present muon g-2 discrepancy (of course, this might be his last talk on this topic).