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The azimuthal decorrelation angle between the leading jet and scatteredlepton in deep inelastic scattering is studied with the ZEUS detector at HERA.The data was taken in the HERA II data-taking period and corresponds to anintegrated luminosity of 330 $\rm{pb^{-1}}$. Azimuthal angular decorrelationhas been proposed to study the $Q^{2}$ dependence of the evolution of thetransverse momentum distributions (TMDs) and understand the small-$x$ region,providing unique insight to nucleon structure. Previous decorrelationmeasurements of two jets have been performed in proton-proton collisions atvery high transverse momentum; these measurements are well described byperturbative QCD at next-to-leading order. The azimuthal decorrelation angleobtained in these studies shows good agreement with predictions from MonteCarlo models including leading order matrix elements and parton showers.  New experimental data on charged particle multiplicity distributions arepresented, covering the kinematic ranges in momentum transfer $5<Q^{2}<100~\rmGeV^{2}$ and inelasticity $0.0375<y<0.6$. The data was recorded with the H1experiment at the HERA collider in positron-proton collisions at acentre-of-mass energy of 320 GeV. Charged particles are counted with transversemomenta larger than 150 MeV and pseudorapidity $-1.6<\eta_{\rm lab}<1.6$ in thelaboratory frame, corresponding to high acceptance in the current hemisphere ofthe hadronic centre-of-mass frame. Charged particle multiplicities are reportedon a two-dimensional grid of $Q^{2}$, $y$ and on a three-dimensional grid of$Q^{2}$, $y$ and $\eta$. The observable is the probability $P(N)$ to observe$N$ particles in the given $\eta$ region. The data are confronted withpredictions from Monte Carlo generators, and with a simplistic model based onquantum entanglement and strict parton-hadron duality.

HERA data on azimuthal decorrelation and charged particle multiplicity spectra probing QCD dynamics and quantum entanglement effects