ABSTRACT
The basic postulate of the quark model is that all hadrons are bound states of particles called quarks. Quarks must be fermions, since only fermions can give bound states that are both bosons and fermions. The quark model was originally constructed using three kinds of quarks: up, down, and strange. The quark model reached perhaps its most sophisticated form due to the efforts of Nathan Isgur and Gabriel Karl, who showed that all of the low energy baryon and meson states could be understood as bound states of quarks using the principles of atomic physics. A baryon is a hadron that is postulated to be a bound state of three different quarks. Constructing baryon wavefunctions is a straightforward, though somewhat tedious, job. There are three spins, three flavors, and three colors, and they all must be put together in a manner that satisfies the Pauli principle.
