Emulsion data for neutrino-induced charmed hadron production studies

It contains 50 muon neutrino interactions with the lead target where a charmed hadron is reconstructed in the final state. Neutrino-induced charm production happens in the so-called charged-current (CC) interactions of a muon neutrino.</p><p>For this data sample, the Collaboration performed a dedicated analysis, searching for decay topologies.

Charmed hadrons have masses and lifetimes similar to those of the tau lepton and we can observe both its production and decay vertices. Given this feature, they constitute one of the main background sources for the tau neutrino observation, when the muon at the primary vertex is not detected. At the same time, they represent the most powerful tool for a data-driven test of the experiment capability of detecting tau decays, given the same topology.</p><p>Over a sample of 2925 muon neutrino CC events fully analysed, 50 charm decay candidates were observed while 54 ± 4 were expected.