TY  - JOUR
AU  - Gonzalez-Alonso, M.
AU  - Pich, A.
AU  - Prades, J.
PY  - 2010
DA  - 2010//
TI  - Violation of quark-hadron duality and spectral chiral moments in QCD
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 074007
EP  - 10pp
VL  - 81
IS  - 7
PB  - Amer Physical Soc
AB  - We analyze the spectral moments of the V – A two-point correlation function. Using all known short-distance constraints and the most recent experimental data from tau decays, we determine the lowest spectral moments, trying to assess the uncertainties associated with the so-called violations of quark-hadron duality. We have generated a large number of acceptable spectral functions, satisfying all conditions, and have used them to extract the wanted hadronic parameters through a careful statistical analysis. We obtain accurate values for the chi PT couplings L-10 and C-87, and a realistic determination of the dimension six and eight contributions in the operator product expansion, O-6 = (-5.4(-1.6)(+3.6)) . 10(-3) GeV6 and O-8 = d(-8.9-(12.6)(7.4+)) 10(-3) GeV8, showing that the duality-violation effects have been underestimated in previous literature.
SN  - 1550-7998
UR  - http://lanl.arxiv.org/abs/1001.2269
UR  - https://doi.org/10.1103/PhysRevD.81.074007
DO  - 10.1103/PhysRevD.81.074007
LA  - English
N1  - ISI:000277201900025
ID  - Gonzalez-Alonso_etal2010
ER  -