Seminarios y conferencias

Exploring tau neutrino appearance measurements in KM3NeT/ORCA

by Chiara Lastoria (Aix Marseille Univ, CNRS/IN2P3, CPPM)

Sala María de Maeztu (Edificio 2)

Sala María de Maeztu (Edificio 2)


Among the main physics goals of next-generation neutrino experiments, there will be high precision measurements of the neutrino oscillation parameters as well as clarifying whether or not CP violation is present in the leptonic sector; in addition to them, testing the validity of the three-flavor paradigm remains one of the most stimulating because it allows for exploring new physics scenarios, beyond the Standard Model. The KM3NeT/ORCA is a water Cherenkov neutrino telescope currently under construction in the Mediterranean Sea. By studying the oscillations of the atmospheric neutrino flux passing through the Earth, KM3NeT/ORCA's primary physics goal is an early measurement of the neutrino mass ordering; additionally, thanks to the accessible unprecedented statistics, it will have high sensitivity for the direct observation of tau neutrino appearance as a test of the standard three-neutrino flavors paradigm. Due to the KM3NeT detector's modular structure, neutrino oscillation analyses are possible also with a partially instrumented volume, the main one has been performed by exploiting data collected with 6 Detection Units (KM3NeT/ORCA6 - equivalent to 5% of the final geometry). Given that the neutrino flux composition is dominated by muon neutrinos producing a track-like topology in the detector, the tau neutrino appearance can be measured on a statistical basis and observed as an excess into the shower-like topology sample. In this seminar, the first measurement of the tau neutrino appearance performed on KM3NeT/ORCA 6 data will be presented; a particular focus will be dedicated to describing the event reconstruction and selection methods developed to distinguish between the two event topologies.

Seminario CFP, hibrido: Edificio 2, Sala María de Maeztu / Zoom

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