Simulation of dark scalar particle sensitivity inηrare decay channels at HIAF  

作　　者：Yang Liu Rong Wang Zaiba Mushtaq Ye Tian Xionghong He Hao Qiu Xurong Chen 刘洋;王荣;Zaiba Mushtaq;田野;何熊宏;仇浩;陈旭荣(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2025年第3期85-94,共10页中国物理C(英文版)

摘　　要：The search for dark portal particles is a prominent topic at the frontier of particle physics.We present a simulation study of an experiment suitable for searching for scalar portal particles at the Huizhouηfactory.The high-intensity proton beam from HIAF and a high event-rate spectrometer are suggested to conduct this experiment,both of which are well-suited for the discovery of new physics.Under a conservative estimation,ηevents could be produced during a one-month operation of the experiment.The hadronic production ofηmesons(p+^(7)Li→ηX)was simulated at a beam energy of 1.8 GeV using the GiBUU event generator.We searched for light dark scalar particles through rare decay channels,namelyη→Sπ^(0)→π^(+)π^(-)π^(0)andη→Sπ^(0)→e^(+)e^(-)e^(0).The detection efficiencies of the channels and the spectrometer resolutions were studied in the simulation.We also present the projected upper limits of the decay branching ratios of the dark scalar particle and the projected sensitivities to the model parameters.

关 键 词：super eta factory eta rare decay dark scalar particle new physics 

分 类 号：O57[理学—粒子物理与原子核物理]