OPE Constraints and the Leading Order Hadronic Contribution to (g-2)_mu

Details OPE Constraints and the Leading Order Hadronic Contribution to (g-2)_mu OPE Constraints and the Leading Order Hadronic Contribution to (g-2)_mu

2006-11-13

arxiv.org/abs/hep-ph/0611179v1

Nucl.Phys.Proc.Suppl.169:244-249,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 5 figures, prepared for the Proceedings of the 9th International Workshop on Tau Lepton Physics

Scientific paper

10.1016/j.nuclphysbps.2007.03.00

OPE constraints are studied as a means of distinguishing between the versions of the I=1 vector spectral function extracted from (i) inclusive I=1 hadronic electroproduction cross-sections and (ii) inclusive I=1 hadronic tau decay data, with the goal of clarifying expectations for the leading order hadronic contribution to a_mu = (g-2)_mu /2 in the Standard Model. The constraints are shown to, at present, favor the tau decay data, and hence a Standard Model prediction for a_mu compatible with the BNL E821 experimental result. The relative role of the 2pi and 4pi contributions to the discrepancy between the integrated electroproduction results and the corresponding OPE constraints is also investigated, and the significance, in this context, of forthcoming re-measurements of the e^+e^- --> pi^+ pi^- pi^0 pi^0 cross-sections pointed out.

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