Strange Quark, Tachyonic Gluon Masses and V_{us} from Hadronic Tau Decays

Details Strange Quark, Tachyonic Gluon Masses and V_{us} from Hadronic Tau Decays Strange Quark, Tachyonic Gluon Masses and V_{us} from Hadronic Tau Decays

2005-01-24

arxiv.org/abs/hep-ph/0501208v3

Phys.Lett.B626:101-110,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.08.085

We apply, to the new OPAL data on V+A strange spectral functions, a suitable combination of QCD spectral sum rules directly sensitive to the combination of strange quark (m_s) and tachyonic gluon (\lambda^2) masses . Using the mean value of \lambda^2 from a sum rule analysis of different channels, we deduce the invariant strange quark mass m_s= (106 +33 -37) MeV to order \alpha_s^3, which leads to the running mass m_s(2 GeV)= (93 +29 -32) MeV. We also obtain an interesting though less competitive estimate of the CKM angle: |V_{us}|=0.217\pm 0.019.

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