Pion Polarisability and Hadronic τ Decays
Abstract
Recent experimental data on τ decays are used to reconstruct the difference in hadronic spectral densities with vector and axialvector quantum numbers. The saturation of DasMathurOkubo and Weinberg sum rules is studied. Two methods of improving convergence and decreasing errors are applied, and good agreement with the predictions of current algebra and chiral perturbation theory is observed. The resulting value of the pion polarisability is α _{E} = (2.64 ± 0.36) 10 ^{4} fm ^{3}.
 Publication:

Nuclear Physics B Proceedings Supplements
 Pub Date:
 March 1997
 DOI:
 10.1016/S09205632(97)000601
 arXiv:
 arXiv:hepph/9609424
 Bibcode:
 1997NuPhS..54..309K
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 LaTeX, 11 pages, including 5 .eps figures. Presented at the "QCD Euroconference", Montpellier, France, July 1996