Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 24: Detector systems II

T 24.5: Talk

Tuesday, March 31, 2020, 18:05–18:20, H-HS II

Electron Identification Studies of Belle II — •Justin Skorupa for the Belle II collaboration — Max Planck Institute for Physics, Muenchen, Bayern

The Belle II experiment at the SuperKEKB e+ e- accelerator in Tsukuba, Japan, aims to precisly measure parameters of the Standard Model (SM) and to discover physics beyond the SM via high precision measurements of rare processes. Physics procceses studied by the experiment are for example B-Mesons or tau decays. Many of those decays contain leptons in the final state. The experiment is therefore required to provide a reliable lepton identification method, and the performance of this method must be precisely determined. A study of the electron Identification (eID) and detector performance, using non-radiative Bhabha events as a control channel, is presented. Bhabha-like candidates are selected and a tag and probe approach is then used to asses the performance of the eID. This study shows that the Belle II eID provides a significant reduction of mis-identified tracks, while retaining electrons with a very high efficiency.