Decay Chain Reconstruction at Belle II

• Main Authors: Tenchini Francesco, Krohn Jo-Frederik
• Format: Article
• Language: English
• Published: EDP Sciences 2019-01-01
• Series: EPJ Web of Conferences
• Online Access: https://www.epj-conferences.org/articles/epjconf/pdf/2019/19/epjconf_chep2018_06023.pdf

The Belle II detector underwent commissioning in 2018. Featuring a state of the art vertex detector with innovative pixel sensors, it will record collisions of e+e- beams from the SuperKEKB accelerator which is slated to provide luminosities 40 times higher than KEKB. This will bring new opportunities and challenges for physicists seeking to perform precision measurements, as increasingly precise vertex position reconstruction and background rejection power is needed to take advantage of the unprecedented statistics provided. We discuss the vertex reconstruction techniques available that make such measurements possible and present an approach to particle decay reconstruction based on the global fit of the full decay chain, implemented using a Kalman Filter. This technique is especially well suited to the treatment of processes with neutral decays. It allows for improved background rejection, access to a larger number of decay modes and a flexible framework for consistent treatment of measurement uncertainties.