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Neutrino oscillations and systematic uncertainties

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Date and time Jan 08, 2018
from 01:10 PM to 02:00 PM
Location MP 912
Host Hiro Tanaka

Akira Konaka

TRIUMF

I will describe how it will be possible to control the systematic uncertainties in upcoming neutrino oscillation experiments

Neutrino oscillation studies enters the precision measurement era.  CP asymmetry in  electron neutrino and anti-neutrino appearances can be as large as 20% depending on the CP phase δcp, which is within reach of new projects aiming at statistical errors of ~3% such as HyperK and DUNE. In order to successfully observe CP asymmetry, controlling  the systematic uncertainty down to 2-3% (or less!) is required. The current  PDG summary of the atmospheric neutrino mixing is consistent with maximal  (sin^2(θ23)=0.51±0.04), possibly indicating μ-τ symmetry in lepton mixing is it persists. On the other hand, the 68% interval of sin^2(θ23) that this is supposed to be based are 0.382-0.434 for NOvA experiment and 0.464-0.538 for T2K, exhibiting slight tension. Systematic uncertainty is the major issue for both experiments,  in particular from nuclear/hadronic effects such as the final state interaction.  Systematic uncertainties, such as theoretical model dependence, do not necessarily  follow a Gaussian distribution, and it is not trivial to properly  estimate 3σ or 5σ sensitivity when the contributions from the systematic uncertainties  becomes significant in the measurements. In this seminar, I will describe essential challenges and opportunities in handling systematic uncertainties in precision neutrino physics measurements, and describe emerging efforts to handle them.

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