First results from the Muon g-2 experiment at Fermilab

At Fermi National Accelerator Laboratory, USA, the Muon g-2 collaboration is performing a new measurement of aμ aiming at a fourfold improvement compared to the predecessor experiment at Brookhaven National Laboratory, USA.
To extract the value of aμ clock comparison experiment is performed with spin-polarized muons confined in a superbly controlled electric and magnetic field environment. The deviation of the Larmor from the cyclotron frequency, the anomalous spin precession frequency, is determined while a high-precision measurement of the magnetic field environment is performed using nuclear magnetic resonance techniques. The first results from the
new muon g-2 experiment provide an independent determination of aμ to 460 ppb. The new world average value, with a decreased uncertainty of 350 ppb, exhibits a 4.2 sigma tension with the community approved Standard Model prediction.
I will discuss the first result of the Muon g-2 experiment at FNAL in the context of current
theoretical developments.

The Colloquium will take place online: Zoom (Password: Kolloquium)