Hadronic contributions for this quantity of the muon have been a major source of theoretical uncertainty in understanding the Brookhaven experimental result.  
Hadronic contributions for this quantity of the muon have been a major source of theoretical uncertainty in understanding the Brookhaven experimental result.  The Dirac equation provides the relationship between this quantity and spin, as summarized in the quantity g.  The deviation of g from its leading behavior is calculated in QED, determining the "anomalous" value of this quantity.  For a current loop in a magnetic field, the torque is the cross product of this with the field.  FTP, name this quantity, whose value is  proportional to the current and the area of the loop.
Hadronic contributions for this quantity of the muon have been a major source of theoretical uncertainty in understanding the Brookhaven experimental result.  
magnetic moment (accept anomalous magnetic moment until the phrase "current loop")