【Report】中国极化电子离子对撞机英文白皮书发布

Daniele P. Anderle, Valerio Bertone, Xu Cao, Lei Chang, Ningbo Chang, et al., Electron-ion collider in China, Front. Phys. 16(6), 64701 (2021)

中国极化电子离子对撞机（EicC）英文白皮书于6月25日在Frontiers of Physics杂志上在线发表。 

核子（质子和中子的统称）是组成宇宙中可见物质的主要成分。然而，目前人们尚不完全清楚其基本性质，比如：在夸克胶子层次如何理解质子自旋与质量构成问题？ 

中科院近代物理研究所主导提出,在强流重离子加速器装置(HIAF)的基础上建造EicC，通过电子离子对撞，以虚光子作为探针扫描核子内部结构，帮助科学家观测微观物质世界中深层次的内部结构，理解核子基本性质等一系列科学问题。 

EicC英文白皮书由近代物理所牵头完成，来自国内外40多家单位的100余名专家参与撰写。英文白皮书阐述了EicC的重要物理目标、加速器和探测器的概念设计等内容，是对2020年2月在《核技术》杂志发表的EicC中文白皮书的进一步深化。 

该白皮书经9名国际专家学术评审通过,面向国内外发布，标志着EicC正式得到国内外同行的关注和认可，为下一步EicC概念设计报告的撰写提供了重要支撑。 

Understanding the visible world that we are living in is of fundamental importance to modern sciences. As the building blocks of visible matter, nucleons (protons and neutrons) are composed of quarks and gluons. However, many basic questions remain unanswered, such as: How do the quark and gluon constituents contribute to the spin and the mass of a nucleon? How do novel multi-particle dynamics emerge from the nuclear environment containing many gluons and sea quarks?

Scientists from the Institute of Modern Physics, together with collaborators around the world, have proposed an Electron-Ion Collider in China (EicC) to carry out dedicated research to explore these open questions. Recently, the English version of the EicC white paper has been released and published in Frontiers of Physics, Volume 16, Issue 6. It includes an overview of highlighted physics goals, detector, and accelerator design. After reaching this milestone of the EicC project, the EicC working group is now moving forward towards the Conceptual Design Report.

The full document of the EicC white paper can be downloaded here:

https://journal.hep.com.cn/fop/EN/10.1007/s11467-021-1062-0     

https://link.springer.com/article/10.1007/s11467-021-1062-0