Finite energy chiral sum rules and tau spectral functions

Feb, 1998
20 pages
Published in:
  • Phys.Rev.D 58 (1998) 096014
e-Print:
Report number:
  • IPNO-TH-98-05,
  • LAL-98-05

Citations per year

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Abstract:
A combination of finite energy sum rule techniques and Chiral Perturbation Theory (ChPT) is used in order to exploit recent ALEPH data on the non-strange tau vector (V) and axial-vector (A) spectral functions with respect to an experimental determination of the ChPT quantity L_{10}. A constrained fit of R_{\tau,V-A}^(k,l) inverse moments (l<0) and positive spectral moments (l>=0) adjusts simultaneously L_{10} and the nonperturbative power terms of the Operator Product Expansion. We give explicit formulae for the first k=0,1 and l=-1,-2 strange and non-strange inverse moment chiral sum rules to one-loop order generalized ChPT. Our final result reads L^r_{10}(M_\rho)=-(5.13 +/- 0.19)x10^{-3}, where the error includes experimental and theoretical uncertainties.
  • perturbation theory: chiral
  • sum rule: finite energy
  • tau: semileptonic decay
  • model: weak interaction
  • mass spectrum
  • spectral representation: moment
  • operator product expansion
  • numerical calculations: interpretation of experiments