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Short range nucleon-nucleon correlations in nuclei (NN SRC) carry importantinformation on nuclear structure and dynamics. NN SRC have been extensivelyprobed through two-nucleon knock- out reactions in both pion and electronscattering experiments. We report here on the detection of two-nucleonknock-out events from neutrino interactions and discuss their topologicalfeatures as possibly involving NN SRC content in the target argon nuclei. TheArgoNeuT detector in the Main Injector neutrino beam at Fermilab has recorded asample of 30 fully reconstructed charged current events where the leading muonis accompanied by a pair of protons at the interaction vertex, 19 of which haveboth protons above the Fermi momentum of the Ar nucleus. Out of these 19events, four are found with the two protons in a strictly back-to-back highmomenta configuration directly observed in the final state and can beassociated to nucleon Resonance pionless mechanisms involving a pre-existingshort range correlated np pair in the nucleus. Another fraction (four events)of the remaining 15 events have a reconstructed back-to-back configuration of anp pair in the initial state, a signature compatible with one-body QuasiElastic interaction on a neutron in a SRC pair. The detection of these twosubsamples of the collected (mu- + 2p) events suggests that mechanisms directlyinvolving nucleon-nucleon SRC pairs in the nucleus are active and can beefficiently explored in neutrino-argon interactions with the LAr TPCtechnology.

The detection of back-to-back proton pairs in Charged-Current neutrino interactions with the ArgoNeuT detector in the NuMI low energy beam line