  The 13 TeV run of the LHC has provided a unique opportunity to explore
multi-jet final states with unprecedented accuracy. An interesting region for
study is that of events where one jet is tagged in the forward direction and
another one in the backward direction and a plethora of low energy mini-jets
populate the possibly large rapidity span in between them. Since the number of
these events is very high, it is possible to introduce stringent constraints on
the transverse momentum of the two leading jets which can be kept in small
windows not very different from each other, defining what we call "twin jets".
The associated "crowd" of mini-jets can also have a restricted span in
transverse momentum. The study of these events for a fixed multiplicity is an
ideal playground to investigate different models of multi-particle production
in hadron-hadron collisions. We set up an exploratory analysis by using an
ancient model of Chew and Pignotti to describe the gross features one can
expect for the structure of single and double differential-in-rapidity cross
sections and for particle-particle rapidity correlations when the longitudinal
phase space completely decouples from the transverse degrees of freedom.
