In our universe, the down quark is about twice as heavy as the upquark, resulting in neutrons that are 0.1 percent heavier than protons.
在我们的宇宙中，底夸克的质量大约是顶夸克的两倍，造成中子比质子重大约0.1%。
2
Jaffe and his colleagues modeled one family of universes in which the down quark was lighter than the upquark, and protons were up to a percent heavier than neutrons.
Jaffe和他的同事建立了一个类型的宇宙，其中底夸克比顶夸克轻，而质子比中子重1%。
3
This first recorded particle is a meson composed of an anti-beauty quark – the beauty quark's antiparticle – and an upquark – one of the two common quarks that make up protons and neutrons.