PT Journal
AU Gonzalez-Alonso, M
   Pich, A
   Prades, J
TI Pinched weights and duality violation in QCD sum rules: A critical analysis
SO Physical Review D
JI Phys. Rev. D
PY 2010
BP 014019
EP 7pp
VL 82
IS 1
DI 10.1103/PhysRevD.82.014019
LA English
AB We analyze the so-called pinched weights, that are generally thought to reduce the violation of quarkhadron duality in finite-energy sum rules. After showing how this is not true in general, we explain how to address this question for the left-right correlator and any particular pinched weight, taking advantage of our previous work [1], where the possible high-energy behavior of the left-right spectral function was studied. 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(-0.7)(+0.9)) x 10(-3) GeV6 and O-8 = (-7.2(-5.3)(+4.2)) x 10(-3) GeV8.
ER