  A class of purely-nonperturbative (PNP) composite operators is defined in
Quantum Chromodynamics, which is perturbative scheme and scale independent and
are useful to describe the internal structure of a strong interacting system.
The operator product expansion in terms of the new operators cleanly separates
the perturbative and nonperturbative physics without introducing any
factorization scale. A number of PNP observables of the nucleon is briefly
discussed including the PNP parton distributions. In particular, the fraction
of the nucleon momentum carried by the purely-nonperturbative gluons is found
to be around 16%.
