Noriaki Watanabe (Nagoya):
Electron g2
Abstract:
The fine structure constant is determined by several
methods using electromagnetic observables. The electron g2 is the best observable for determing it.
The uncertainty in the fine structure constant is 20 times smaller than for the next most precise
independent method. However, through a new experiment, it can be expected that the uncertainty of
the independent method could be almost the same as the best one. The values of the fine structure
constant determined by 2 independent methods should be consistent. Confirmation of this will be the
most stingent test of QED. We need to know QED contributions at 5 loop level completely to give
the test a precise meaning. In this talk, I will explain the status of the calculations.
