2006/08/22 by R. G. Ping, Ping Rong-Gang, Mo Xiao-Hu +15
Medicine · Physics and Astronomy · #Data Analysis #FOS: Physical sciences #Medical Imaging Techniques and Applications #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #Statistics and Probability (physics.data-an) #physics.data-an
paper · pdf · doi:10.48550/arxiv.physics/0608213
3 pages, 2 figures
arxiv created 2006/08/22 · openalex publication_date 2006/08/22 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
In measuring the \psip radiative decays at BESII, contribution of the background is serious in most of the final states. To extract the number of signal events, a fit to the χ2 distribution of kinematic fit using signal and background components is proposed. Extensive Monte-Carlo simulations (MCS) are performed, and the results show that the shape of χ2 distribution of the signal channel looks different from those of the background channels, thus it provides us by fitting the χ2 distribution of the data to extract the number of signal events. An input-output test is performed using MCS, and the uncertainty of the fit method is found to be less than 2%.