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

Abstract

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 $1/N_c$ 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 $a_{\mu }$ which is $-(11\pm 5)\cdot 10^{-10}$. This is between two and three sigmas the expected experimental uncertainty at the forthcoming BNL experiment.

LaTeX, 9 pages, uses epsf.sty, two figures included Mistake in FORTRAN program corrected. The numerical results and conclusions are changed significantly

References in corpus (2)

• Chiral Lagrangians and Nambu-Jona-Lasinio like models
• Three-loop QED Vacuum Polarization and the Four--loop Muon Anomalous Magnetic Moment

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