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The gluonic condensate from the hyperfine splitting in charmonium
The precision measurement of the hyperfine splitting MeV in the
Fermilab--E835 experiment allows to determine the gluonic condensate with
high accuracy if the gluonic correlation length is fixed. In our
calculations the negative value of MeV is
obtained only if the relatively small fm and
GeV are taken. These values correspond to the ``physical'' string tension
GeV). For fm the hyperfine splitting
is positive and grows for increasing . In particular for fm
and GeV the splitting MeV
is obtained, which is in accord with the recent CLEO result.Comment: 9 pages revtex 4, no figure