Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 37: Neutrino physics without accelerators IV

T 37.3: Talk

Tuesday, March 31, 2020, 17:30–17:45, L-2.017

Latest advances in the development of a likelihood fit for the Double Chooz experiment — •Philipp Soldin, Christopher Wiebusch, and Achim Stahl — III. Physikalisches Institut B, RWTH Aachen University

Double Chooz is a reactor neutrino disappearance experiment that was operating between 2011 and the end of 2017. Its main purpose has been a precise measurement of the neutrino mixing angle θ₁₃. The experimental setup consisted of two identical liquid scintillator detectors at average baselines of about 400 m and 1 km to two reactor cores at the nuclear power plant in Chooz, France. The neutrinos were detected by the measurement of the inverse beta decay (IBD) signature, which consists of a prompt positron annihilation and a delayed neutron capture signal. The neutrino mixing angle θ₁₃ can be obtained by utilising the rate and spectral energy shape of IBD events and all relevant backgrounds in a multivariate likelihood fit. This fit can also be used to observe deviations from the nuclear reactor spectral shape predictions. The latest advancements and applications of such a fit and the development of a new unbinned likelihood fit method are discussed in this talk.