Assuming the gluon field is well approximated by instanton configurations we
derive a light quarks determinant and calculate its contribution to the
specific heavy quarks correlators -- namely, the heavy quark propagator and
heavy quark-aniquark correlator, receiving the instanton generated light-heavy
quarks interaction terms contributions. With these knowledge we calculate the
light quark contribution to the interaction between heavy quarks, which might
be essential for the properties of a few heavy quarks systems.Comment: Talk given at the workshop "Hadron Nuclear Physics 2011", APCTP,
Pohang, Republic of Korea, Feb. 21-24, 2011. The workshop proceedings will be
published at the EPJ web of conferences (http://www.epj-conferences.org/
