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Physicist believe there are six quarks - up (u), down (d), charm (c), strange (s), top (t), and bottom (b) and their antiquarks - antiup, antidown, anticharm, antistrange, antibottom, and antitop. Antiquarks are labeled with a letter with a bar over it. |
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Each baryon consists of three quarks or three antiquarks represented by small circles within the larger circle. Quarks are labeled with a letter. A baryon cannot be made of a mixture of quarks and antiquarks. |
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The most familiar baryons are protons and neutrons. They make up the nucleus of atoms and are made up of top and bottom quarks. In fact, everything you see in the world, for example, your computer or your body, is made of top and down quarks and electrons. They are truly the building blocks of matter. |