In Feynman diagrams, quarks and antiquarks are represented by different symbols. Quarks are denoted by solid lines, while antiquarks are represented by dashed lines. The specific quarks involved in a Feynman diagram depend on the process being depicted.
There are six flavors of quarks in the Standard Model of particle physics:
- Up quark (u)
- Down quark (d)
- Charm quark (c)
- Strange quark (s)
- Top quark (t)
- Bottom quark (b)
These quarks can have different electric charges, and they also have different masses. The up, charm, and top quarks have a positive electric charge, while the down, strange, and bottom quarks have a negative electric charge.
In a Feynman diagram, you may encounter various combinations of quarks depending on the specific interaction being described. For example, a typical process in particle physics involves the exchange of a W boson, which can change the flavor of quarks. In such cases, different quark flavors can be involved in the initial and final states of the interaction.
If you have a specific Feynman diagram or process in mind, please provide more details, and I'll be happy to help you further.