Duality violation in QCD Sum Rules with the LR correlator

We analyse the so-called violations of quark-hadron duality in Finite Energy Sum Rules (FESRs) with the LR correlator, through the study of the possible high-energy behavior of the LR spectral function, taking into account all known short-distance constraints and the experimental tau-decay data. In particular we show that the use of pinched weights (PWs) allows to determine with high accuracy the dimension six and eight contributions in the Operator-Product Expansion, O6=(−4.3−0.7+0.9)⋅10−3GeV6 and O8=(−7.2−5.3+4.2)⋅10−3GeV8 [M. González-Alonso, A. Pich, and J. Prades, Phys. Rev.D81 (2010) 074007, arXiv:1001.2269 [hep-ph]; M. González-Alonso, A. Pich, and J. Prades, Phys. Rev.D82 (2010) 014019, arXiv:1004.4987 [hep-ph]].