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From oscillation dip to oscillation valley in atmospheric neutrino experiments

Not scheduled


Mr Anil Kumar (Insitute of Physics, Bhubaneswar. Homi Bhabha National Institute, Mumbai)


Atmospheric neutrino experiments can show the “oscillation dip” feature in data, due to their sensitivity over a large $L/E$ range. In experiments that can distinguish between neutrinos and antineutrinos, like INO, oscillation dips can be observed in both these channels separately. We present a data-driven approach -- that uses the asymmetry in the up and down events, binned in the reconstructed $L/E$ of muons – to demonstrate the dip, thereby confirming the oscillation hypothesis. We further propose, for the first time, the identification of an “oscillation valley” in the ($E_{\mu} - \cos\theta_{\mu}$) plane, feasible for detectors like INO having excellent muon energy and direction resolutions. We illustrate how this two-dimensional valley offers a clear visual representation and test of the $L/E$ dependence, the alignment of the valley quantifying the atmospheric mass-squared difference.


Reconstructing oscillation dip and two-dimensional valley using up-down asymmetry of muons at INO

Experiment/Collaboration India-based Neutrino Observatory (INO)

Primary author

Mr Anil Kumar (Insitute of Physics, Bhubaneswar. Homi Bhabha National Institute, Mumbai)


Amina Khatun (Comenius University, Bratislava, Slovakia) Mr Sanjib Kumar Agarwalla (Institute of Physics, Bhubaneswar, Homi Bhabha National Institute, and International Centre for Theoretical Physics) Prof. Amol Dighe (Tata Institute of Fundamental Research, Mumbai)

Presentation materials