Hardons Hardons are the composite particle; means particles that are made of more than one quark. Hardons are sub-divided into two types of particles called Baryons and Mesons. Baryons: Proton and Neutron are known as baryons; means that they are made of exactly three quarks . Baryons are in the family of Hardons, which means that they are made of quark. NOTE: Composite Fermions(especially 3 quarks) in which case they are called baryons. Baryons are called composite fermions because it follows Pauli exclusion principle (half-integer spin). Mesons: The only other subcategory of Hardons is Mesons, which are made of one quark and one antiquark. NOTE: Composite bosons(especially 2 quarks) in which case they are called meson. Mesons are called composite bosons because it doesn't follow Pauli exclusion principle.(Thus have integer spin and called composite bosons).
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