Using Pandax-? Data To Search For WIMPs Particles With Inelastic Scattering Process

Weakly Interacting Massive Particles(WIMP)have become the most popular candidate model in the field of dark matter detection because of the agreement between their theoretical models and actual observations and the feasibility of relatively easy to perform actual detection.For the interaction between dark matter and common matter is generally considered weak interaction,and the reaction form between them occurs,the mainstream theory is spin-independent elastic scattering.In recent years,in order to explain the DAMA/LIBRA,the experimental group of CRESST-II and other suspected dark matter signals found in the experiment,some theoretical physicists tried to use the inelastic scattering theory to explain these suspected signals.For inelastic scattering,part of its kinetic energy is converted into the internal energy of the WIMPs,which results in a poor quality between the initial and final states of the WIMPs.With the successive adoption of various detection technologies,the existence of WIMPs and the determination of the lower limit of the interaction cross-section have been continuously promoted.The PandaX-I/II experiment uses the most competitive two-phase gas/liquid helium time projection chamber detection method in the direct detection of dark matter.In this thesis,we first give an overview of the dark matter theory and the PandaXII dark matter direct detection experiment's overall framework,data analysis methods,and the scale of the detector.Then we will focus on the theoretical calculations related to inelastic scattering and the detailed procedures and methods for calculating the dark matter exclusion lines.The Profile Likelihood Ratio statistic and the CLs method were used in this article to statistically analyze and report the final dark matter data.The resulting exclusion curve result shows that the three suspect signals for CRESST-II have been excluded for background signal.