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A study of prompt charm-hadron pair production in proton-lead collisions at$\sqrt{s_\mathrm{NN}}= 8.16$ TeV is performed using data corresponding to anintegrated luminosity of about 30 nb${}^{-1}$, collected with the LHCbexperiment. Production cross-sections for different pairs of charm hadrons aremeasured and kinematic correlations between the two charm hadrons areinvestigated. This is the first measurement of associated production of twocharm hadrons in proton-lead collisions. The results confirm the predictedenhancement of double parton scattering production in proton-lead collisionscompared to the single parton scattering production.

Observation of enhanced double parton scattering in proton-lead collisions at $\sqrt{s_\mathrm{NN}}=8.16$ TeV