Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 48: Neutrino Physics without Accelerators 3

T 48.2: Vortrag

Dienstag, 22. März 2022, 16:30–16:45, T-H33

Likelihood based Sterile Neutrino Search with Double Chooz — •Lars Heuermann, Philipp Soldin, Achim Stahl, and Christopher Wiebusch — RWTH Aachen University - Physics Institute III B, Aachen, Germany

The Double Chooz experiment was a reactor electron anti-neutrino disappearance experiment with the purpose of measuring the neutrino oscillation angle θ₁₃. It used two nearly identical detectors at the respective distances of 400m and 1050m to the reactors of the nuclear power plant in Chooz, France, for this purpose.

Sterile neutrinos are hypothetical neutrino mass states, which do not participate in weak interactions, but still could participate in neutrino oscillations and thus would be measurable with Double Chooz. We present a search which focusses on a profile likelihood approach to test the data with respect to the parameters of a model with a single additional sterile neutrino state (3+1 model). A particular challenge thereby is that Wilks’ theorem is not fulfilled and computationally intensive parameter scans have to be used to estimate the test statistics. The talk explains the analysis method and presents the median sensitivity for the sterile mixing parameter θ₁₄ in dependence of Δ m₄₁², as well as an analysis of the available experimental dataset.