The experimental value a _μ^\rmexp for the muon magnetic anomaly measured at the Brookhaven National Laboratory (BNL), Upton, USA, and the latest theoretical value a _μ^\rmtheo based on a number of calculations and auxiliary experiments differ today by 3.3 standard deviations. Discrepancies between different independent approaches towards the theoretical value could recently be removed and had yielded a consistent value for a _μ^\rmtheo. At the Fermi National Laboratory (Fermilab), Batavia, USA, a new experiment ..