Duality violation in QCD Sum Rules with the LR correlator

✍ Scribed by Martín González-Alonso; Antonio Pich; Joaquim Prades

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 835 KB
• Volume: 207-208
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/j.nuclphysbps.2010.10.073

✦ Synopsis

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, 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 [1, 2].