Revealing dressed quarks via the proton's charge distribution.
Revealing dressed quarks via the proton's charge distribution.
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DOI：
10.1103/physrevlett.111.101803
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发表时间：
2013-04
影响因子：
8.6
通讯作者：
I. Cloët;C. Roberts;A. Thomas
中科院分区：
文献类型：
--
作者：
I. Cloët;C. Roberts;A. Thomas
质子可以说是自然界中最基本的、易于检测的组成部分。它位于每个原子核的中心，从未观察到衰变。然而，它是一个复合对象，由其价夸克含量定义：u+u+d-即，两个上（u）夸克和一个下（d）夸克;以及它们影响该束缚态内电荷和磁化分布的方式。最近人们对这些分布有了许多新的认识;现在看来，质子的动量-空间电荷分布可能为零。在未来十年的实验应该回答这个和相关的进展所提出的关键问题;我们解释这些新的信息如何有助于绘制强相互作用中关键涌现现象的起源和影响。具体来说，我们表明，可能存在的质子的电形状因子和零的位置是一个衡量标准模型中的夸克-夸克相互作用的非微扰功能，特别敏感的穿着夸克质量的运行。
The proton is arguably the most fundamental of nature's readily detectable building blocks. It is at the heart of every nucleus and has never been observed to decay. It is nevertheless a composite object, defined by its valence-quark content: u+u+d--i.e., two up (u) quarks and one down (d) quark; and the manner by which they influence, inter alia, the distribution of charge and magnetization within this bound state. Much of novelty has recently been learned about these distributions; and it now appears possible that the proton's momentum-space charge distribution possesses a zero. Experiments in the coming decade should answer critical questions posed by this and related advances; we explain how such new information may assist in charting the origin and impact of key emergent phenomena within the strong interaction. Specifically, we show that the possible existence and location of a zero in the proton's electric form factor are a measure of nonperturbative features of the quark-quark interaction in the standard model, with particular sensitivity to the running of the dressed-quark mass.