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T: Fachverband Teilchenphysik

T 80: Neutrinophysik VIII

T 80.2: Vortrag

Donnerstag, 22. März 2018, 16:50–17:05, Z6 - HS 0.001

Tau-neutrino appearance with KM3NeT/ORCA — •Steffen Hallmann for the ANTARES-KM3NeT-Erlangen collaboration — Friedrich-Alexander-Universität Erlangen-Nürnberg, ECAP

The deep-sea neutrino detector KM3NeT/ORCA – currently under construction in the Mediterranean Sea – is optimised to study oscillations of atmospheric neutrinos in the few GeV energy range. Within its instrumented volume of more than 7 Mm³ of sea water, an unprecedented statistics of >3k neutrinos per year are detected which have oscillated from a purely ν_µ and ν_e initial flux into the ν_τ-channel along their passage through Earth. As the major contribution comes from ν_µ—→ν_τ conversion, the ν_τ flux can be determined as a statistical excess of shower-like event topologies.

The contribution will present the sensitivity of KM3NeT/ORCA to ν_τ-appearance. Recent improvements in the detector geometry, trigger and reconstruction algorithms with respect to the performance presented in the Letter of Intent for KM3NeT 2.0 are taken into account. KM3NeT/ORCA will confirm the exclusion of non-appearance within the first months of operation. In the longer run, a precise measurement of the ν_τ normalisation will allow to put stringent experimental constraints on the commonly presumed unitarity of the PMNS matrix describing 3-flavour neutrino mixing.