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delta baryon
The Delta baryons (or Δ baryons, also called Delta resonances) are a family of subatomic particle made of three up or down quarks (u or d quarks).
Four Δ baryons exist: (constituent quarks: uuu), (uud), (udd), and (ddd), which respectively carry an electric charge of +2 ''e'', +1 ''e'', 0 ''e'', and −1 ''e''.
The Δ baryons have a mass of about , a spin of , and an isospin of . In many ways, Δ baryons are 'excited' nucleon (symbol N), which are made of the same constituent quarks in a lower-energy spin configuration (spin ). The (uud), (udd) are the higher-energy equivalent of the proton (, uud) and neutron (, udd). However, the and have no nucleon equivalent.
==Composition==
The four Δ baryons are distinguished by their electrical charges, which is the sum of the charges of the quarks from which they are composed. There are also four antiparticles with opposite charges, made up of the corresponding antiquarks. The existence of the , with its unusual +2 charge, was a crucial clue in the development of the quark model.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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