Lattice calculation of the lowest-order hadronic contribution to the muon anomalous magnetic momen

Details Lattice calculation of the lowest-order hadronic contribution to the muon anomalous magnetic momen Lattice calculation of the lowest-order hadronic contribution to the muon anomalous magnetic momen

2004-11-02

arxiv.org/abs/hep-lat/0411002v1

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages. Contribution to the proceedings of Lattice 2004 (Fermilab)

Scientific paper

10.1016/j.nuclphysbps.2004.11.17

I present quenched domain wall fermion and 2+1 flavor improved Kogut-Susskind fermion calculations of the hadronic vacuum polarization which are used to calculate the ${\cal O}(\alpha^2)$ hadronic contribution to the anomalous magnetic moment of the muon. Together with previous quenched calcuations, the new results confirm that in the quenched theory the hadronic contribution is signifcantly smaller ($\sim 30%$) than the value obtained from the total cross section of $e^+e^-$ annhilation to hadrons. The 2+1 flavor results show an increasing contribution to $g-2$ as the quark mass is reduced.

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