Hadronic Light-by-Light Contribution to the Muon g-2

الأصل · EN

Mistake in FORTRAN program corrected. The numerical results and conclusions are changed significantly: We present a calculation of the hadronic light-by-light contributions to the muon g-2 in the 1/Nc expansion. We have used an Extended NJL model and introduced an explicit cut-off for the high energy region. We have then critically studied the relative size of the high energy contributions. Although we find them large we can give a conservative estimate of the light-by-light contribution to aμ which is -(11±5) · 10⁻¹⁰. This is between two and three sigmas the expected experimental uncertainty at the forthcoming BNL experiment.