This first recorded particle is a meson composed of an anti-beauty quark – the beauty quark's antiparticle – and an up quark – one of the two common quarks that make up protons and neutrons.

这次实验，第一次记录下来的是一个介子，它是由一个反美夸克（ 美夸克的反粒子）和一个上夸克（组成质子和中子的普通夸克之一）所组成。

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This first recorded particle is a meson composed of an anti-beauty quark – the beauty quark's antiparticle – and an up quark – one of the two common quarks that make up protons and neutrons.

这次实验，第一次记录下来的是一个介子，它是由一个反美夸克（ 美夸克的反粒子）和一个上夸克（组成质子和中子的普通夸克之一）所组成。

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