Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 53: Suche nach Neuen Teilchen III

T 53.8: Vortrag

Mittwoch, 27. März 2019, 17:45–18:00, H07

Search for Highly Ionizing Particles with the Pixel Detector in the Belle II Experiment — Soeren Lange, Klemens Lautenbach, Leonard Koch, Dennis Getzkow, Simon Reiter, and •Katharina Dort — Justus Liebig University Giessen, Giessen, Germany

The Belle II experiment, located at the SuperKEKB collider at the high-energy research facility KEK in Tsukuba, Japan, started operation in 2018. Compared to the predecessor experiment Belle, Belle II plans to increase the peak luminosity by a factor of 40, by employing nano-beam technology in the interaction region.

In particular the new, innermost sub-detector of Belle II - the Pixel Vertex Detector (PXD) - is in close proximity to the interaction point. This allows for the detection of particles, which do not leave a signal in the outer sub-detectors. Among these, Highly Ionizing Particles (HIPs) possess a characteristically severe energy loss limiting their penetration depth into the detector.

Magnetic monopoles, stable tetraquarks and anti-deuterons as possible HIPs are considered. Without a signal in the outer sub-detectors, no trigger is issued resulting in a loss of information about them. In this talk the possibility of identifying HIPs solely with information provided by the PXD is presented, by using neural network algorithms operating in a multi-dimensional parameter space of e.g. PXD cluster data. Most notably, the application of unsupervised learning in the form of Self-Organizing Maps (SOM) is presented.