New Measurement of (g-2) of the Muon
gμ ≡2(1 + aμ) is needed for calculating a from the hyperfine splitting in muonium;
aμ verifies quantum electrodynamics (QED) at high q2 ~(20 GeV/c)2 making it very unlikely that the theory will be at fault in the low q2 region appropriate for other measurements of fundamental constants;
corrections to ae and aμ due to modifications of QED, or to couplings to new fields in most cases satisfy1) the rule △ae = (me/mμ) △aμ. So the verification of aμ to 25 ppm validates ae to a much higher accuracy, thus ensuring that ae gives a good measure of α.
KeywordsHyperfine Splitting Uniform Magnetic Field Fundamental Constant Muon Spin Pure Determination
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- 2.J. Bailey, K. Borer, F. Combley, H. Drumm, C. Eck, F. J. M. Farley, J. H. Field, W. Flegel, P. M. Hattersley, F. Krienen, F. Lange, G. Petrucci, E. Picasso, H. I. Pizer, O. Runolfsson, R. W. Williams and S. Wojcicki, Physics Letters 55B, 420 (1975).Google Scholar