Application of the missing mass method in the fixed-target program of the STAR experiment

  • The search for short-lived particles is usually the final stage in the chain of event reconstruction and precedes event selection when operating in online mode or physics analysis when operating in offline mode. Most often such short-lived particles are neutral and their search and reconstruction is carried out using their daughter charged particles resulting from their decay. The use of the missing mass method makes it possible to find and analyze also decays of charged short-lived particles, when one of the daughter particles is neutral and is not registered in the detector system. One of the most known examples of such decays is the decay Σ− → nπ−. In this paper, we discuss in detail the missing mass method, which was implemented as part of the KF Particle Finder package for the search and analysis of short-lived particles, and describe the use of the method in the STAR experiment (BNL, USA). The method was used to search for pion (π± → μ±ν) and kaon (K± → μ±ν and K± → π±π0) decays online on the HLT farm in the express production chain. An important feature of the express production chain in the STAR experiment is that it allows one to start calibration, production, and analysis of the data immediately after receiving them. Here, the particular features and results of the real-time application of the method within the express processing of data obtained in the BES-II program at a beam energy of 3.85 GeV/n when working with a fixed target are presented and discussed.

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Author:Yuri V. FisyakORCiD, Victor Ivanov, Hongwei KeORCiD, Ivan KiselORCiDGND, Pavel KiselGND, Grigory KozlovGND, Spyridon Margetis, Aihong TangORCiD, Iouri VassilievORCiD, Maksym ZyzakGND
Parent Title (English):EPJ Web of Conferences
Publisher:EDP Sciences
Place of publication:Les Ulis
Document Type:Article
Date of Publication (online):2021/08/23
Date of first Publication:2021/08/23
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Creating Corporation:STAR Collaboration
Contributing Corporation:International Conference on Computing in High Energy and Nuclear Physics (25. : 2021 : Online)
Release Date:2023/01/31
Page Number:10
Institutes:Physik / Physik
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0