北京谱仪实验物理成果
Highlights of the experiments performed on the Beijing Spectrometer
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摘要: 当前描述物质微观基本结构最成功的理论是粒子物理的标准模型，包括描述强作用力的量子色动力学，描述弱相互作用和电磁作用力的电弱理论。在量子色动力学方面，人们对夸克禁闭问题和低能非微扰性质还不能完全理解；在电弱理论方面，需要实验上提供更加精确的参数约束和检验。北京正负电子对撞机和北京谱仪实验是我国最早的大科学装置，也是目前国际上唯一运行在陶粲能量区域的高亮度实验装置，致力于在强子物理、量子色动力学的非微扰性质、电弱理论检验和寻找超标准模型的新物理等方面开展研究。文章将介绍北京谱仪多年来在实验上取得的科学成果，包括陶轻子质量精确测量、R值测量、奇特强子态研究和粲强子弱衰变测量等。Abstract: The standard model of particle physics is the most successful theory in describing the fundamental microscopic structure of matter in the universe. It consists of the theory of quantum chromodynamics for the strong interaction, and the electro-weak theory for the weak and electromagnetic (EW) interactions. In the quantum chromodynamics (QCD) theory, the nature of the quark confinement and low-energy non-perturbative property is still not clear; in the electro-weak theory, more stringent parameter constraints and experimental tests are required. The Beijing Electron-Position Collider (BEPCII) and Beijing Spectrometer (BESIII) are amongst the earliest largescale scientific facilities in China, and the only ones in the world still conducting high-luminosity experiments in the tau-charm energy region. They focus on research in hadron physics, non-perturbative effects in QCD, precision tests of the EW theory, and the search for new physics beyond the standard model. This article will review the highlights of the BESIII experiments during the past decades, such as the precise measurement of the tau lepton mass, the R value measurement, studies on the exotic hadrons, and measurements of the charmed hadron weak decays.
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Keywords:
- BEPCII /
- BESIII /
- electron-positron annihilation /
- tau lepton mass /
- charm physics
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