Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-17
Phys.Rev.D77:053012,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
54 pages, 5 figures. A new experimental result is added
Scientific paper
10.1103/PhysRevD.77.053012
We have carried out a new evaluation of the eighth-order contribution to the electron g-2 using FORTRAN codes generated by an automatic code generator gencodeN. Comparison of the "new" result with the "old" one has revealed an inconsistency in the treatment of the infrared divergences in the latter. With this error corrected we now have two independent determinations of the eighth-order term. This leads to the revised value 1 159 652 182.79 (7.71) x 10^{-12} of the electron g-2, where the uncertainty comes mostly from that of the best non-QED value of the fine structure constant alpha. The new value of alpha derived from the revised theory and the latest experiment is alpha^{-1} = 137.035 999 084 (51) [0.37 ppb], which is about 4.7 ppb smaller than the previous alpha^{-1}.
Aoyama Takahiro
Hayakawa Masahiko
Kinoshita Takahiro
Nio Makiko
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