Possible duality violations in tau decay and their impact on the determination of alpha_s

Details Possible duality violations in tau decay and their impact on the determination of alpha_s Possible duality violations in tau decay and their impact on the determination of alpha_s

2008-12-12

arxiv.org/abs/0812.2285v2

Phys.Rev.D79:053002,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 4 figures. Minor fixes in the Appendix

Scientific paper

10.1103/PhysRevD.79.053002

We discuss the issue of duality violations in hadronic tau decay. After introducing a physically motivated ansatz for duality violations, we estimate their possible size by fitting this ansatz to the tau experimental data provided by the ALEPH collaboration. Our conclusion is that these data do not exclude significant duality violations in tau decay. This may imply an additional systematic error in the value of alpha_s(m_tau), extracted from tau decay, as large as \delta alpha_s(m_tau) \sim 0.003-0.010 .

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