底夸克是带有电荷−1⁄3 e的 第三代夸克，又称为美夸克。
那些更精细的分析并没有发现这种假设的粒子，所以，也许它因为某些原因并不会衰变成底夸克。
Those more-refined analyses have not seen the hypothetical new particle, so for some reason it must not decay into bottom quarks.
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%。
Jaffe and his colleagues modeled one family of universes in which the down quark was lighter than the up quark, and protons were up to a percent heavier than neutrons.
这些粒子叫做“夸克”，它们有六种不同的“味”，但Jaffe只着眼于最常见的夸克：“顶夸克”、“底夸克”和“奇异夸克”。
These particles are called "quarks" and they come in six different "flavors" but Jaffe only looked at the most common quarks: the 'up,' 'down' and 'strange'.
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