%0 Journal Article
%T Strange Quark, Tachyonic Gluon Masses and $V_{us}$ from Hadronic Tau Decays
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Narison, S.
%Z Latex 2e file, 9 pages, 2 figures
%< avec comité de lecture
%Z PM/05-09
%@ 0370-2693
%J Physics Letters B
%I Elsevier
%V 626
%P 101-110
%8 2005
%D 2005
%Z hep-ph/0501208
%R 10.1016/j.physletb.2005.08.085
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]Journal articles
%X 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 $\hat{m}_s= (115.6\pm16.8)$ MeV to order $\alpha_s^3$, which leads to the running mass $\bar{m}_s$(2 GeV)= ($103.1\pm15.1$) MeV. The case $\lambda^2 = 0$ leads to a lower value $\bar{m}_s$(2 GeV)= ($70.1\pm18.4$) MeV, in the boarderline of the lower bound 90 MeV derived from different sum rules, and lower than most of the existing determinations of $m_s$. We also obtain an interesting though less competitive estimate of the CKM angle: $\left|V_{us}\right|=0.2185\pm0.036.
%G English
%L in2p3-00024178
%U https://hal.in2p3.fr/in2p3-00024178
%~ IN2P3
%~ LPTA
%~ CNRS
%~ UNIV-MONTP2
%~ UNIV-MONTPELLIER
%~ UM1-UM2