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

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

1995-05-08

arxiv.org/abs/hep-ph/9505251v2

Phys.Rev.Lett.75:1447-1450,1995; Erratum-ibid.75:3781,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevLett.75.1447

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 $-(11\pm5) \cdot 10^{-10}$. This is between two and three sigmas the expected experimental uncertainty at the forthcoming BNL experiment.

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