Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 67: Neutrinophysik / theoretische Astroteilchenphysik

T 67.8: Vortrag

Mittwoch, 21. März 2018, 18:20–18:35, Z6 - SR 2.011

Latest advances in the development of a poissonian based likelihood fit for the Double Chooz experiment — Denise Hellwig¹, Philipp Kampmann², Stefan Schoppmann³, •Philipp Soldin¹, Achim Stahl¹, and Christopher Wiebusch¹ — ¹III. Physikalisches Institut B, RWTH Aachen University — ²IKP Jülich — ³MPIK Heidelberg

Double Chooz is a reactor neutrino disappearance experiment with the purpose of a precise measurement of the neutrino mixing angle θ₁₃. The experimental setup consists of two identical liquid scintillator detectors at average baselines of about 400m and 1km to two reactor cores at the nuclear power plant in Chooz, France. The neutrinos are detected by measuring the signature of the inverse beta decay (IBD), which consists of a prompt positron signal and a delayed neutron capture signal. By performing a simultaneous poissonian based likelihood fit of both detector neutrino rates, energy spectral shapes and all relevant backgrounds, the neutrino mixing angle θ₁₃ can be obtained. The method, design and latest advances of such a likelihood fit are presented in this talk. Furthermore, a crosscheck for the latest final fit results is shown.