SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 74: Poster

HK 74.40: Poster

Donnerstag, 23. März 2023, 17:30–19:00, HSZ EG

Physics Performance Studies of K_s⁰ with the CBM Experiment — •Felix Fidorra for the CBM collaboration — Institut für Kernphysik WWU Münster, Münster, Germany

The Compressed Baryonic Matter (CBM) is a fixed target heavy-ion experiment which is currently under construction at FAIR in Darmstadt. It will explore the QCD phase diagram at high net-baryon densities (µ B > 500 MeV). A key element for the investigation of the dense baryonic matter are the measurements of the strange hadron yields, the most often produced K_s⁰ and Λ as well as rare (multi-)strange hyperons and their antiparticles. To reconstruct the decays of these particles, a particle finder, based on the Kalman Filter, is used. A boosted decision tree machine learning model has been trained to distinguish between signal and background. Simulations using two different event generators, UrQMD and DCM-QGSM-SMM, are used for this study. Since K_s⁰ decay with the highest probability symmetrically into two soft pions of opposite charge, their reconstruction gives insights into the performance of the CBM detector. This poster will be about the status of K_s⁰ analysis. The aim is to maximize the signal significance of the K_s⁰ decay candidates selection using the machine learning algorithms and validate the multi-step and multi-differential fitting routine for K_s⁰ yield extraction.