在自然界裡，暗物質佔了總物質量的百分之八十以上，但是我們卻對它的性質一無所知，最多只知道 它是電中性的，參與重力作用，但是它有幾種、是費米子還是玻色子、質量大小等等都不清楚。目前 有許多種尋找和了解暗物質的方法，有些是尋找在高能量的質子對撞中而產生的暗物質，如：大強子 對撞機的實驗；有些是尋找暗物質煙滅後而產生的標準模型粒子對，如：反物質磁譜儀；有些則是尋 找因暗物質和偵測器裡的原子反應、進而激發或游離原子而產生的信號，例如：大型地下氙實驗。這 個計畫著重在尋找大強子對撞機裡所產生的暗物質。計畫主要分成兩部分，第一部分是利用俱有孤立 希格斯粒子和迷失動量的事件來尋找暗物質，第二部分則是利用雙波色子事件來尋找暗物質束縛態。 計畫總共時間為三年，而在這期間並加上在2015-2016 年所累積的數據，預計大約會有150 fb-1。如果 暗物質和標準模型之間存在非重力的交互作用，我們將有機會看到質量約等於或低於750 GeV 的暗物 質或排除一些簡單暗物質模型大部分的物理參數區域。 ;Although the dominant component of the matter in the universe is dark matter (DM), its underlying particle nature remains unknown and cannot be explained within the standard model (SM). At most, we know that DM particles are electrically neutral and participate in the gravitational interaction. However, we do not know how many kinds of DMs there are and the mass or spin of the DMs. Currently there are several complementary experiments to search for and study the DMs; (i) look for DMs produced in high-energy proton-proton collisions, such as the experiments at large hadron collider (LHC), (ii) look for SM particles produced after DM annihilation, such as the Alpha Magnetic Spectrometer Experiment (AMS), (iii) look for signal produced by the DM-nucleon scattering, such as the Large Underground Xenon dark matter experiment (LUX). In this research proposal, we propose to look for dark matter produced at LHC using the 13 TeV data collected by the CMS detector. The proposal is divided into two parts. The first part looks for DMs in the mono-Higgs channel while the second part looks for dark matter bound states (the Darkonium) using the di-boson events. The duration of the research lasts for three years. Including the data collected in the years of 2015 and 2016, we expect to accumulate about 150 fb-1 of pp collisions during this period. If non-gravitational interaction exists between the DMs and SM particles, we expect to observe DM particles with mass equal to or less than 750 GeV or exclude a large fraction of the parameter space in several DM simplified models.
