A determination of QCD condensates from e+e− annihilation

Abstract Results of a new determination of QCD condensates from e + e − → I = 1 hadrons data are given. Using a new method to analyse these data, we show that the range of values for the gluon condensate α s π GG and for the four quarks condensates, compatible with these data, is even larger than what could be expected from the already large dispersion of previous determinations. The ‘standard’ value .01 GeV 4 is in the allowed range, but values as large as .30 GeV 4 are not completely excluded for the gluon condensate. Its value is however strongly correlated with the value of the four quarks condensates. We also find evidences that the dimension 8 condensates should be rather large.