62 articles – 636 Notices  [english version]
 HAL : in2p3-00024178, version 1
 arXiv : hep-ph/0501208
 Physics Letters B 626 (2005) 101-110
 Strange Quark, Tachyonic Gluon Masses and $V_{us}$ from Hadronic Tau Decays
 (2005)
 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.
 Thème(s) : Physique/Physique des Hautes Energies - Phénoménologie
 Lien vers le texte intégral : http://fr.arXiv.org/abs/hep-ph/0501208
 in2p3-00024178, version 1 http://hal.in2p3.fr/in2p3-00024178 oai:hal.in2p3.fr:in2p3-00024178 Contributeur : Dominique Girod <> Soumis le : Vendredi 27 Mai 2005, 11:42:34 Dernière modification le : Vendredi 5 Mai 2006, 14:57:25