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T: Fachverband Teilchenphysik
T 103: Neutrino Physics without Accelerators 8
T 103.2: Talk
Thursday, March 24, 2022, 16:30–16:45, T-H35
Optimization of selection cuts for the directional analysis of sub-MeV solar neutrinos in Borexino — •Antonia Weßel1,3, Alexandre Göttel2,3, Sindhujha Kumaran2,3, Livia Ludhova2,3, Luca Pelicci2,3, Ömer Penek2,3, and Apeksha Singhal2,3 — 1GSI Helmholtzcentre for Heavy Ion Research, Darmstadt, Germany — 2Forschungszentrum Jülich GmbH, Nuclear Physics Institute IKP-2, Jülich, Germany — 3III. Physikalisches Institut B, RWTH Aachen University, Aachen, Germany
Borexino, a liquid scintillator (LS) detector at the Gran Sasso National Laboratory in Italy, has measured all solar neutrinos thanks to its low energy threshold, high energy resolution, and unprecedented radio-purity. Although LS detectors generally cannot obtain any directional information as opposed to Water Cherenkov detectors, Borexino now achieved the first directional measurement of sub-MeV solar neutrinos. The method is based on the early Cherenkov photons which are emitted before the dominant scintillation light. The first photons of the events are then correlated to the Sun's direction. The resulting angles are summed up to form an angular distribution, which is used to measure the total number of solar neutrinos in the selected energy region of interest. For this analysis, high statistics and an excellent signal-to-background ratio are necessary. These criteria can only be met by optimizing the data selection cuts to find the best combination of the fiducial volume and the definition of the energy interval. This talk will describe the strategy for the selection cut optimization and present the resulting fiducial volume and energy region.