Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 67: Detektorsysteme III

T 67.8: Talk

Wednesday, March 27, 2019, 17:45–18:00, S03

A Multivariate Track Quality Estimation for the Belle II Experiment — Florian Bernlochner, Nils Braun, •Michael Eliachevitch, and Felix Metzner for the Belle 2 collaboration — ETP, KIT, Karlsruhe

Starting from April 2018 The Belle II experiment at the SuperKEKb accelerator facility in Tsukuba, Japan, has successfully recorded first collisions data for calibration and testing purposes, to prepare the physics data taking in early 2019. Many analyses rely on the ability of the Belle II detector and software to correctly reconstruct all tracks originating from a BB decay event. Depending on their sensitivity to falsely reconstructed tracks and the rarity of their signal processes, different analyses can profit from a varying trade-off between the tracking efficiency and purity. In this talk, I present a method for a quality estimation of tracks in the Belle II Analysis Software Framework, which combines information from the different subdetectors and their respective tracking algorithms by employing multivariate analysis techniques. It provides a track quality indicator that can be used to choose and an optimal working point on the efficiency vs. purity receiver operating curve at analysis level.