V. Kolesnikov, D. Suvarieva, V. Vasendina, A. Zinchenko
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引用次数: 0
Abstract
Obtaining quality physics results requires high-statistics data with low background contamination. The task of maximizing the signal as well as accurate estimation of combinatorial background is especially important at the start-up of the experiment when the amount of data is rather limited. The Multi-Purpose Detector (MPD) experiment at the NICA collider will have to deal with such issues in its first run. In this article, the task of reconstructing lambda hyperons with their weak decay into a proton and a negative pion using Monte Carlo simulated event samples of heavy-ion collisions is considered. Two approaches for evaluating the combinatorial background in the invariant mass spectra of decay products are studied: like-sign pair combinations and event mixing. Background-subtracted and efficiency-corrected hyperon distributions are presented, demonstrating performance of the MPD experiment in the future collider run.
要获得高质量的物理结果，需要高统计量、低背景污染的数据。在数据量相当有限的实验启动阶段，最大化信号以及准确估计组合背景的任务尤为重要。位于 NICA 对撞机上的多用途探测器（MPD）实验在首次运行时就必须解决这些问题。本文考虑了利用蒙特卡洛模拟重离子对撞的事件样本来重构λ超子弱衰变为质子和负先驱的任务。研究了评估衰变产物不变质量谱中组合背景的两种方法：同类符号对组合和事件混合。介绍了背景减去和效率校正的超子分布，展示了 MPD 实验在未来对撞机运行中的性能。
期刊介绍：
The journal Fizika Elementarnykh Chastits i Atomnogo Yadr of the Joint Institute for Nuclear Research (JINR, Dubna) was founded by Academician N.N. Bogolyubov in August 1969. The Editors-in-chief of the journal were Academician N.N. Bogolyubov (1970–1992) and Academician A.M. Baldin (1992–2001). Its English translation, Physics of Particles and Nuclei, appears simultaneously with the original Russian-language edition. Published by leading physicists from the JINR member states, as well as by scientists from other countries, review articles in this journal examine problems of elementary particle physics, nuclear physics, condensed matter physics, experimental data processing, accelerators and related instrumentation ecology and radiology.
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