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We present the first detailed simulation study of tau neutrino-inducedcharged current (CC) events from atmospheric neutrino interactions in the IronCalorimeter (ICAL) detector at the proposed India-based Neutrino Observatory(INO) laboratory. Since the intrinsic atmospheric neutrino flux at few to 10sof GeV energy comprises only electron and muon neutrinos (and anti-neutrinos)with negligible tau neutrino component, any signature of atmospheric tauneutrinos is a signal for neutrino oscillations. We study the tau leptonsproduced through these CC interactions via their hadronic decay. These eventsappear as an excess over the neutral current (NC) background where hadrons arethe only observable component. We find that the presence of tau neutrinos inthe atmospheric neutrino flux can be demonstrated to nearly $4\sigma$confidence with 10 years data; in addition, these events are sensitive to theneutrino oscillation parameters, $\sin^2\theta_{23}$ and $\vert \Delta m_{31}^2\vert$ (or $\vert \Delta m_{32}^2 \vert$), in the 2--3 sector. Finally, we showthat combining these events with the standard muon analysis which is the coregoal of ICAL further improves the precision with which these parameters,especially the octant of $\theta_{23}$, can be measured.

A simulation study of tau neutrino events at the ICAL detector in INO