  The fragmentation of deuterons into pions emitted forward in the kinematic
region forbidden for free nucleon-nucleon collisions is analyzed. It is shown
that the inclusion of the non-nucleon degrees of freedom in a deuteron allows
to describe the experimental data about inclusive pion spectrum rather
satisfactory and improves the description of data concerning the deuteron
analyzing power T_{20}. The experimental data show the positive sign and very
small values, less than 0.2, of T_{20} what can't be reproduced by the
calculations ignoring these degrees of freedom.
