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In particle physics, the baryon number is a strictly conserved additive quantum number of a system. It is defined as
where nq is the number of quarks, and nq is the number of antiquarks. Baryons have a baryon number of +1, mesons have a baryon number of 0, and antibaryons have a baryon number of −1. Exotic hadrons like pentaquarks and tetraquarks are also classified as baryons and mesons depending on their baryon number.
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