New Developments in the Investigation of the Nucleon Spin Structure with Spin Polarized Proton Collisions

我们在世界上唯一的偏振质子-质子对撞机上开发了PHENIX实验的事件选择系统。该项目的主要目的是了解质子的结构，质子是物质的基本组成部分，包括我们自己，从基本粒子的重要特征，自旋的角度来看。该系统首次利用极化质子-质子碰撞产生的弱玻色子，直接测量海夸克的自旋极化，开启了质子自旋结构研究的新纪元。

We have developed an event selection system for PHENIX experiment at the only polarized proton-proton collider in the world. The main purpose of the project is to understand the structure of the proton, which is the fundamental constituents of the matter, which includes ourselves, from the viewpoint of the important characteristic of an elementary particle, spin. This new system has opened a new era of the proton spin-structure studies to measure the spin polarization of sea quarks directly, by means of weak boson production in polarized proton-proton collision for the first time in the world.