Qweak Experiment: Measurement of the Proton's Weak Charge

一项旨在探索基本粒子相互作用标准模型以外的物理的重大新实验即将在杰斐逊实验室开始采集数据。杰斐逊实验室是北美首屈一指的电子束加速器设施，用于核物理和粒子物理研究。“量子弱”实验将测量质子的弱电荷--这是决定质子如何对弱相互作用作出反应的基本性质。标准模型的一个关键预测是，所有相互作用的强度，以“耦合常数”为特征，实际上都与能量尺度有关。对于弱相互作用，这一性质还没有得到高精度的测试。通过测量质子的弱电荷，我们将能够确定预期的弱相互作用的‘奔跑’

A major new experiment to search for physics beyond the Standard Model of fundamental particle interactions is about to start taking data at Jefferson Laboratory, North America's premier electron beam accelerator facility for nuclear and particle physics research. The `Qweak' experiment will measure the proton's weak charge -- a basic property that determines how a proton responds to the weak interaction. One of the Standard Model's key predictions is that the strengths of all interactions, characterized by `coupling constants' are in fact energy scale dependent. This property has not yet been tested to high precision for the weak interaction. By measuring the proton's weak charge, we will be able to determine whether the anticipated `running' of the weak interaction