Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-03
Nucl.Phys.Proc.Suppl. 96 (2001) 364-374
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages including 1 table. Talk given at the QCD00 International Euroconference (6-13th July 2000, Montpellier-France)
Scientific paper
10.1016/S0920-5632(01)01154-9
Recent ALEPH/OPAL data on the V-A spectral functions from hadronic tau decays are used for fixing the QCD continuum threshold at which the first and second Weinberg sum rules should be satisfied in the chiral limit, and for predicting the values of the low-energy constants f_\pi,~m_{\pi^+}-m_{\pi^0} and {L}_{10}. Some DMO-like sum rules and the $\tau$-total hadronic widths R_{\tau,V-A} are also used for extracting the values of the D=6,~8 QCD vacuum condensates and the corresponding (in the chiral limit) electroweak kaon penguin matrix elements Q^{3/2}_{8,7}\ra_{2\pi},, where a deviation from the vacuum saturation estimate has been obtained. Combining these results with the one of the QCD penguin matrix element Q^{1/2}_{6}\ra_{2\pi} obtained from a (maximal) \bar qq-gluonium mixing scheme from the scalar meson sum rules, we deduce, in the Electroweak Standard Model (ESM), the conservative upper bound for the CP-violating ratio: \epsilon'/\epsilon \leq (22\pm 9) 10^{-4}, in agreement with the present measurements.
No associations
LandOfFree
V-A hadronic tau decays : a QCD laboratory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with V-A hadronic tau decays : a QCD laboratory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and V-A hadronic tau decays : a QCD laboratory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-308822