Alpha_s(M_Z) from hadronic tau decays

Details Alpha_s(M_Z) from hadronic tau decays Alpha_s(M_Z) from hadronic tau decays

2008-07-03

arxiv.org/abs/0807.0650v2

Phys.Rev.D78:094020,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, 3 figures. Published version. Minor rearrangements and subdivision of longer sections into subsections for ease of r

Scientific paper

10.1103/PhysRevD.78.094020

We perform an extraction of alpha_s based on sum rules involving isovector hadronic tau decay data. The particular sum rules employed are constructed specifically to suppress contributions associated with poorly known higher dimension condensates, and hence reduce theoretical systematic uncertainties associated with the treatment of such contributions which are shown to be present in earlier related analyses. Running our results from the n_f=3 to n_f=5 regime we find alpha_s(M_Z^2)=0.1187(16), in excellent agreement with the recently updated global fit to electroweak data at the Z scale, 0.1191(27), and other high-scale direct determinations.

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