Seminario #6 del Ciclo de Seminarios CIEMAT - Física de Partículas 2021

First results from the Muon g-2 experiment at Fermilab
por Martin Fertl (Johannes Gutenberg University Mainz)

The long-persisting discrepancy between the Standard Model prediction of the anomalous magnetic moment of the muon (a) and its latest measurement provides an intriguing hint to new physics. Over the years, the SM prediction was significantly improved without providing a resolution to the problem. At Fermi National Accelerator Laboratory, USA, the Muon g-2 collaboration is performing a new measurement of a aiming at an ultimately fourfold smaller uncertainty than achieved with the predecessor experiment at Brookhaven National Laboratory, USA. To extract the value of a, a 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.

свернуть