Publication: MISSING MASS METHOD for SHORT-LIVED PARTICLE RECONSTRUCTION in the CBM and STAR EXPERIMENTS
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2021
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© 2021 CEUR-WS. All rights reserved.The search for short-lived particles is an important part of physics research in experiments with relativistic heavy ions. To find, select and study the properties of such short-lived particles in real time in the CBM experiment (FAIR/GSI, Germany), we have developed a package of algorithms, KF Particle Finder, which contains a search for more than 150 decay channels. The decays of short-lived charged particles, when one of the daughter particles is neutral and cannot be registered in the detector system, are also of great physics interest. To find and study such decays, we have extended the KF Particle Finder package by implementing the missing mass method, which is based on the conservation of energy and momentum laws. The method was studied in detail on simulated data of the CBM experiment, showing high efficiency with a large signal-to-background ratio, as well as high significance. As part of the FAIR Phase-0 program, the KF Particle Finder package of algorithms has been adapted for online and offline processing in the STAR experiment (BNL, USA). Here we describe and discuss in detail the missing mass method for finding and analyzing short-lived particles. The features of the application of the method to both simulated data in the CBM experiment and in the STAR experiment as part of real-time express data processing, as well as the results of the real-time reconstruction of short-lived particle decays in the BES-II environment of the STAR experiment, are given.
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MISSING MASS METHOD for SHORT-LIVED PARTICLE RECONSTRUCTION in the CBM and STAR EXPERIMENTS / Fisyak, Y. [et al.] // CEUR Workshop Proceedings. - 2021. - 3041. - P. 473-477