The /VA sum rules and the operator product expansion in complex q^{2}plane from /τdecay data
Abstract
The operator product expansion (OPE) for the difference of vector and axial current correlators is analyzed for complex values of momentum q ^{2}. The vector and axial spectral functions, taken from hadronic τdecay data, are treated with the help of Borel, gaussian and spectral moments sum rules. The range of applicability, advantages and disadvantages of each type are discussed. The general features of OPE are confirmed by the data. The vacuum expectation values of dimension6 and 8 operators are found to be O _{6}=(6.8±2.1)×10 ^{3} GeV^{6}, O _{8}=(7±4)×10 ^{3} GeV^{8}.
 Publication:

Nuclear Physics A
 Pub Date:
 May 2001
 DOI:
 10.1016/S03759474(00)005789
 arXiv:
 arXiv:hepph/0010089
 Bibcode:
 2001NuPhA.687..437I
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 1 latex + 10 eps files, 14 pages