  In this paper we show that QCD at high energies leads to the multiplicity
distribution $\frac{\sigma_n}{\sigma_{ \rm in}}\,\,=\,\,\frac{1}{N}\,\Lb
\frac{N\,-\,1}{N}\Rb^{n - 1}$, (where $N$ denotes the average number of
particles), and to entanglement entropy $S \,=\,\ln N$, confirming that the
partonic stat at high energy is maximally entangled. However, the value of $N$
depends on the kinematics of the parton cascade. In particular, for DIS$N =
xG(x,Q)$ , where $xG$ is the gluon structure function, whil for hadron-hadron
collisions, $N \propto Q^2_S(Y)$, where $Q_s$ denotes the saturation scale. We
checked that this multiplicity distribution describes the LHC data for low
multiplicities $n \,<\,(3 \div 5)\,N$, exceeding it for larger values of $n$.
We view this as a result of our assumption, that the system of partons in
hadron-hadron collisions atc.m. rapidity $Y=0$ is dilute. We show that the data
can be described at large multiplicities in the parton model, if we do not make
this assumption.

High Energy Physics - Phenomenology