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: Resonance Effective Theory versus Experiment

: Resonance Effective Theory versus Experiment. J. Portolés IFIC, Valencia. Summary. Short overview: Hadron  decays Axial-Vector form factors The Resonance Effective Theory of QCD Spectrum and structure functions Analysis of experimental data: ALEPH , CLEO-II and OPAL.

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: Resonance Effective Theory versus Experiment

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  1. : Resonance Effective Theory versus Experiment J. Portolés IFIC, Valencia

  2. Summary • Short overview: Hadron  decays • Axial-Vector form factors • The Resonance Effective Theory of QCD Spectrum and structure functions • Analysis of experimental data: ALEPH,CLEO-IIandOPAL

  3. Form factors in up to now • Models Gounaris & Sakurai (1968) Kühn & Santamaría (1990) • Quantity and Quality of data: ALEPH, CLEO-II, OPAL • Parameterization to analyse experimental data TAUOLA[Z. Was & collab.]

  4. About TAUOLA • Kühn & Santamaríamodel • Low-energyexpansionin

  5. : Axial-vector form factors

  6. in the Resonance Effective Theory [D. Gómez Dumm, A. Pich, J.P., hep-ph/0312183] • ResonanceChiralTheory (RcT) [Ecker et al. 1989] + ….. but • Oneoctetofresonancesonly • Off-shellwidthsfor(770) anda1(1260) • AsymptoticbehaviourruledbyQCD

  7. Resonance Chiral Theory + 1/NC   a1 LRT = L(2) + LV+ LA + LVAP 5unknown couplings

  8. Asymptotic behaviour of ImA [G. Floratos, S. Narison, E. de Rafael,1979] • QCD ruled asymptotic behaviour of form factors 3unknowncouplings • Feynman diagrams :1 ONLYunknown, 0 Four parameters a1(1260)

  9. Fit to the ALEPH spectrum

  10. Structure functions OPAL CLEO-II

  11. Outlook • Axial-vector form factors in Good description ofALEPH,CLEO-II andOPALexperimental data New determination of : Prediction of Structure Functions : main features already included tiny contributions from • Room for improvement : • Analysis of all   3P processes

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