  We postulate that non-perturbative QCD effects occurring during parton
fragmentation can result in collective effects of a multi-parton system,
reminiscent of those observed in high-energy hadronic or nuclear interactions
with large final-state particle multiplicity. Proton-proton collisions at the
Large Hadron Collider showed surprising signatures of a strongly interacting,
thermalized quark-gluon plasma, which was thought only to form in collisions of
large nuclear systems. Another puzzle observed earlier in $e^{+}e^{-}$
collisions is that production yields of various hadron species appear to follow
a thermal-like distribution with a common temperature. We propose searches for
thermal and collective properties resulting from parton fragmentation processes
using high multiplicity jets in high-energy elementary collisions. Several
novel observables are studied using the PYTHIA 8 Monte Carlo event generator.
Experimental observation of such collectivity will offer a new view of
non-perturbative QCD dynamics of multi-parton systems at the smallest scales.
Absence of any collective effects may offer new insights into the role of
quantum entanglement in the observed thermal behavior of particle production in
high energy collisions.
