6533b82cfe1ef96bd128ed34
RESEARCH PRODUCT
Violation of quark-hadron duality and spectral chiral moments in QCD
Martín González-alonsoAntonio PichJoaquim Pradessubject
Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsParticle physicsHadronDimension (graph theory)Duality (optimization)FísicaFOS: Physical sciencesElementary particleCorrelation function (quantum field theory)Particle decayHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics::ExperimentOperator product expansiondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-01-13 |