Duality violation in QCD Sum Rules with the LR correlator

Details Duality violation in QCD Sum Rules with the LR correlator Duality violation in QCD Sum Rules with the LR correlator

2010-10-06

arxiv.org/abs/1010.1219v1

Nucl.Phys.Proc.Suppl.207-208:285-289,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the 15th International QCD Conference (Montpellier, 28th June - 3rd July 2010) and the Internation Light Cone 20

Scientific paper

10.1016/j.nuclphysbps.2010.10.07

We analyse the so-called violations of quark-hadron duality in Finite Energy Sum Rules 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 allows to determine with high accuracy the dimension six and eight contributions in the Operator-Product Expansion, O_6 = (-4.3^{+0.9}_{-0.7}) 10^{-3} GeV^6 and O_8 = (-7.2^{+4.2}_{-5.3}) 10^{-3} GeV^8.

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